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1.210 jsyn 17: <a href="index.html"><img alt="[OpenBSD]" height="30" width="141" src="images/smalltitle.gif" border="0"></a>
1.106 deraadt 18: <p>
1.294 david 19: <h2><font color="#e00000">Security</font></h2>
20: <hr>
1.1 deraadt 21:
1.114 philen 22: <table width="100%">
23: <tr>
24: <td colspan="2">
25: <strong>Index</strong>
26: </td>
27: </tr>
28: <tr>
29: <td valign="top">
1.294 david 30: <a href="#goals">Security goals of the Project</a>.<br>
31: <a href="#disclosure">Full Disclosure policy</a>.<br>
32: <a href="#process">Source code auditing process</a>.<br>
33: <a href="#default">"Secure by Default"</a>.<br>
34: <a href="#crypto">Use of Cryptography</a>.<br>
35: <p>
36: <a href="#watching">Watching changes</a>.<br>
37: <a href="#reporting">Reporting security issues</a>.<br>
38: <a href="#papers">Further Reading</a><br>
1.106 deraadt 39: <p>
1.114 philen 40: </td>
41: <td valign="top">
1.225 deraadt 42: For security advisories for specific releases, click below:<br>
43: <a href="#20">2.0</a>,
44: <a href="#21">2.1</a>,
45: <a href="#22">2.2</a>,
46: <a href="#23">2.3</a>,
47: <a href="#24">2.4</a>,
48: <a href="#25">2.5</a>,
49: <a href="#26">2.6</a>,
50: <a href="#27">2.7</a>,
51: <a href="#28">2.8</a>,
52: <a href="#29">2.9</a>,
53: <a href="#30">3.0</a>,
54: <a href="#31">3.1</a>,
1.246 deraadt 55: <a href="#32">3.2</a>,
1.261 david 56: <a href="#33">3.3</a>,
1.280 david 57: <a href="#34">3.4</a>,
1.301 miod 58: <a href="#35">3.5</a>,
1.312 david 59: <a href="#36">3.6</a>,
1.318 deraadt 60: <a href="#37">3.7</a>,
1.321 brad 61: <a href="#38">3.8</a>,
1.334 brad 62: <a href="#39">3.9</a>,
63: <a href="#40">4.0</a>.
1.114 philen 64: </td>
65: </tr>
66: </table>
1.56 deraadt 67: <hr>
68:
1.294 david 69: <a name="goals"></a>
1.278 deraadt 70: <ul>
1.294 david 71: <li><h3><font color="#e00000">Goal</font></h3><p>
1.22 deraadt 72:
1.14 deraadt 73: OpenBSD believes in strong security. Our aspiration is to be NUMBER
1.22 deraadt 74: ONE in the industry for security (if we are not already there). Our
75: open software development model permits us to take a more
76: uncompromising view towards increased security than Sun, SGI, IBM, HP,
77: or other vendors are able to. We can make changes the vendors would
1.27 deraadt 78: not make. Also, since OpenBSD is exported with <a href=crypto.html>
1.45 deraadt 79: cryptography</a>, we are able to take cryptographic approaches towards
80: fixing security problems.<p>
1.18 deraadt 81:
1.288 matthieu 82: <a name="disclosure"></a>
1.294 david 83: <li><h3><font color="#e00000">Full Disclosure</font></h3><p>
1.106 deraadt 84:
1.45 deraadt 85: Like many readers of the
1.196 jufi 86: <a href="http://online.securityfocus.com/archive/1">
1.18 deraadt 87: BUGTRAQ mailing list</a>,
1.106 deraadt 88: we believe in full disclosure of security problems. In the
89: operating system arena, we were probably the first to embrace
90: the concept. Many vendors, even of free software, still try
91: to hide issues from their users.<p>
92:
93: Security information moves very fast in cracker circles. On the other
94: hand, our experience is that coding and releasing of proper security
95: fixes typically requires about an hour of work -- very fast fix
96: turnaround is possible. Thus we think that full disclosure helps the
97: people who really care about security.<p>
98:
1.288 matthieu 99: <a name="process"></a>
1.294 david 100: <li><h3><font color="#e00000">Audit Process</font></h3><p>
1.15 deraadt 101:
1.12 deraadt 102: Our security auditing team typically has between six and twelve
1.45 deraadt 103: members who continue to search for and fix new security holes. We
104: have been auditing since the summer of 1996. The process we follow to
105: increase security is simply a comprehensive file-by-file analysis of
1.106 deraadt 106: every critical software component. We are not so much looking for
107: security holes, as we are looking for basic software bugs, and if
1.138 deraadt 108: years later someone discovers the problem used to be a security
1.106 deraadt 109: issue, and we fixed it because it was just a bug, well, all the
110: better. Flaws have been found in just about every area of the system.
111: Entire new classes of security problems have been found during our
112: audit, and often source code which had been audited earlier needs
113: re-auditing with these new flaws in mind. Code often gets audited
114: multiple times, and by multiple people with different auditing
115: skills.<p>
1.12 deraadt 116:
1.94 deraadt 117: Some members of our security auditing team worked for Secure Networks,
118: the company that made the industry's premier network security scanning
119: software package Ballista (Secure Networks got purchased by Network
120: Associates, Ballista got renamed to Cybercop Scanner, and well...)
121: That company did a lot of security research, and thus fit in well
1.106 deraadt 122: with the OpenBSD stance. OpenBSD passed Ballista's tests with flying
123: colours since day 1.<p>
1.31 deraadt 124:
1.34 deraadt 125: Another facet of our security auditing process is its proactiveness.
1.45 deraadt 126: In most cases we have found that the determination of exploitability
127: is not an issue. During our ongoing auditing process we find many
128: bugs, and endeavor to fix them even though exploitability is not
129: proven. We fix the bug, and we move on to find other bugs to fix. We
130: have fixed many simple and obvious careless programming errors in code
131: and only months later discovered that the problems were in fact
132: exploitable. (Or, more likely someone on
1.197 jufi 133: <a href="http://online.securityfocus.com/archive/1">BUGTRAQ</a>
1.45 deraadt 134: would report that other operating systems were vulnerable to a `newly
135: discovered problem', and then it would be discovered that OpenBSD had
136: been fixed in a previous release). In other cases we have been saved
137: from full exploitability of complex step-by-step attacks because we
138: had fixed one of the intermediate steps. An example of where we
1.94 deraadt 139: managed such a success is the lpd advisory that Secure Networks put out.
140: <p>
1.29 deraadt 141:
1.288 matthieu 142: <a name="newtech"></a>
1.294 david 143: <li><h3><font color="#e00000">New Technologies</font></h3><p>
1.278 deraadt 144:
145: As we audit source code, we often invent new ways of solving problems.
146: Sometimes these ideas have been used before in some random application
147: written somewhere, but perhaps not taken to the degree that we do.
148: <p>
149:
150: <ul>
151: <li>strlcpy() and strlcat()
152: <li>Memory protection purify
153: <ul>
154: <li>W^X
155: <li>.rodata segment
156: <li>Guard pages
157: <li>Randomized malloc()
158: <li>Randomized mmap()
159: <li>atexit() and stdio protection
160: </ul>
1.295 otto 161: <li>Privilege separation
1.278 deraadt 162: <li>Privilege revocation
163: <li>Chroot jailing
164: <li>New uids
165: <li>ProPolice
166: <li>... and others
167: </ul>
168: <p>
169:
1.294 david 170: <li><h3><font color="#e00000">The Reward</font></h3><p>
1.106 deraadt 171:
1.45 deraadt 172: Our proactive auditing process has really paid off. Statements like
1.35 deraadt 173: ``This problem was fixed in OpenBSD about 6 months ago'' have become
1.45 deraadt 174: commonplace in security forums like
1.197 jufi 175: <a href="http://online.securityfocus.com/archive/1">BUGTRAQ</a>.<p>
1.35 deraadt 176:
1.45 deraadt 177: The most intense part of our security auditing happened immediately
1.80 espie 178: before the OpenBSD 2.0 release and during the 2.0->2.1 transition,
1.45 deraadt 179: over the last third of 1996 and first half of 1997. Thousands (yes,
180: thousands) of security issues were fixed rapidly over this year-long
181: period; bugs like the standard buffer overflows, protocol
182: implementation weaknesses, information gathering, and filesystem
183: races. Hence most of the security problems that we encountered were
184: fixed before our 2.1 release, and then a far smaller number needed
185: fixing for our 2.2 release. We do not find as many problems anymore,
186: it is simply a case of diminishing returns. Recently the security
187: problems we find and fix tend to be significantly more obscure or
188: complicated. Still we will persist for a number of reasons:<p>
1.36 deraadt 189:
1.35 deraadt 190: <ul>
1.45 deraadt 191: <li>Occasionally we find a simple problem we missed earlier. Doh!
1.35 deraadt 192: <li>Security is like an arms race; the best attackers will continue
1.45 deraadt 193: to search for more complicated exploits, so we will too.
194: <li>Finding and fixing subtle flaws in complicated software is
195: a lot of fun.
1.35 deraadt 196: </ul>
1.106 deraadt 197: <p>
1.15 deraadt 198:
1.14 deraadt 199: The auditing process is not over yet, and as you can see we continue
1.28 deraadt 200: to find and fix new security flaws.<p>
1.12 deraadt 201:
1.288 matthieu 202: <a name="default"></a>
1.294 david 203: <li><h3><font color="#e00000">"Secure by Default"</font></h3><p>
1.106 deraadt 204:
205: To ensure that novice users of OpenBSD do not need to become security
206: experts overnight (a viewpoint which other vendors seem to have), we
207: ship the operating system in a Secure by Default mode. All non-essential
208: services are disabled. As the user/administrator becomes more familiar
209: with the system, he will discover that he has to enable daemons and other
210: parts of the system. During the process of learning how to enable a new
211: service, the novice is more likely to learn of security considerations.<p>
212:
213: This is in stark contrast to the increasing number of systems that
214: ship with NFS, mountd, web servers, and various other services enabled
215: by default, creating instantaneous security problems for their users
216: within minutes after their first install.<p>
217:
1.288 matthieu 218: <a name="crypto"></a>
1.294 david 219: <li><h3><font color="#e00000">Cryptography</font></h3><p>
1.106 deraadt 220:
221: And of course, since the OpenBSD project is based in Canada, it is possible
222: for us to integrate cryptography. For more information, read the page
1.116 deraadt 223: outlining <a href=crypto.html>what we have done with cryptography</a>.</p>
1.106 deraadt 224:
1.294 david 225: <li><h3><font color="#e00000">Advisories</font></h3><p>
1.106 deraadt 226:
227: <li>
1.334 brad 228: <a name="40"></a>
229:
230: <h3><font color="#e00000">OpenBSD 4.0 Security Advisories</font></h3>
231: These are the OpenBSD 4.0 advisories -- all these problems are solved
232: in <a href=anoncvs.html>OpenBSD current</a> and the
233: <a href=stable.html>patch branch</a>.
234:
235: <p>
236: <ul>
1.342 ! mbalmer 237: <li><a href="errata40.html#011_xorg">Apr 4, 2007:
! 238: Multiple vulnerabilities in X.Org.</a>
1.340 deraadt 239: <li><a href="errata40.html#m_dup1">Mar 7, 2007:
240: Incorrect mbuf handling for ICMP6 packets.</a>
1.339 deraadt 241: <li><a href="errata40.html#agp">Jan 3, 2007:
1.338 miod 242: Insufficient validation in vga(4) may allow an attacker to gain
243: root privileges on some i386 systems.</a>
1.339 deraadt 244: <li><a href="errata40.html#ldso">Nov 19, 2006:
1.337 deraadt 245: ld.so(1) fails to properly sanitize the environment.</a>
1.339 deraadt 246: <li><a href="errata40.html#systrace">Nov 4, 2006:
1.334 brad 247: Fix for an integer overflow in systrace(4)'s STRIOCREPLACE support,
248: found by Chris Evans.</a>
1.339 deraadt 249: <li><a href="errata40.html#openssl">Nov 4, 2006:
1.334 brad 250: Several problems have been found in OpenSSL.</a>
1.339 deraadt 251: <li><a href="errata40.html#httpd">Nov 4, 2006:
1.334 brad 252: httpd(8) does not sanitize the Expect header from an HTTP request
253: when it is reflected back in an error message, which might allow
254: cross-site scripting (XSS) style attacks.</a>
255: </ul>
256:
257: <li>
1.321 brad 258: <a name="39"></a>
259:
260: <h3><font color="#e00000">OpenBSD 3.9 Security Advisories</font></h3>
261: These are the OpenBSD 3.9 advisories -- all these problems are solved
262: in <a href=anoncvs.html>OpenBSD current</a> and the
263: <a href=stable.html>patch branch</a>.
264:
265: <p>
266: <ul>
1.342 ! mbalmer 267: <li><a href="errata39.html#021_xorg">Apr 4, 2007:
! 268: Multiple vulnerabilities in X.Org.</a>
1.340 deraadt 269: <li><a href="errata39.html#m_dup1">Mar 7, 2007:
270: Incorrect mbuf handling for ICMP6 packets.</a>
1.338 miod 271: <li><a href="errata39.html#agp">Jan 3, 2007:
272: Insufficient validation in vga(4) may allow an attacker to gain
273: root privileges on some i386 systems.</a>
1.336 brad 274: <li><a href="errata39.html#ldso">Nov 19, 2006:
1.337 deraadt 275: ld.so(1) fails to properly sanitize the environment.</a>
1.333 deraadt 276: <li><a href="errata39.html#ssh">Oct 12, 2006:
1.332 brad 277: Fix 2 security bugs found in OpenSSH.</a>
1.333 deraadt 278: <li><a href="errata39.html#systrace">Oct 7, 2006:
1.331 brad 279: Fix for an integer overflow in systrace(4)'s STRIOCREPLACE support,
1.330 brad 280: found by Chris Evans.</a>
1.333 deraadt 281: <li><a href="errata39.html#openssl2">Oct 7, 2006:
1.330 brad 282: Several problems have been found in OpenSSL.</a>
1.333 deraadt 283: <li><a href="errata39.html#httpd2">Oct 7, 2006:
1.330 brad 284: httpd(8) does not sanitize the Expect header from an HTTP request
285: when it is reflected back in an error message, which might allow
286: cross-site scripting (XSS) style attacks.</a>
1.333 deraadt 287: <li><a href="errata39.html#openssl">Sep 8, 2006:
1.329 brad 288: Due to incorrect PKCS#1 v1.5 padding validation in OpenSSL, it is
289: possible for an attacker to construct an invalid signature which
290: OpenSSL would accept as a valid PKCS#1 v1.5 signature.</a>
1.333 deraadt 291: <li><a href="errata39.html#bind">Sep 8, 2006:
1.328 brad 292: Two Denial of Service issues have been found with BIND.</a>
1.333 deraadt 293: <li><a href="errata39.html#sppp">Sep 2, 2006:
1.327 brad 294: Due to the failure to correctly validate LCP configuration option
295: lengths, it is possible for an attacker to send LCP packets via an
296: sppp(4) connection causing the kernel to panic.</a>
1.333 deraadt 297: <li><a href="errata39.html#isakmpd">Aug 25, 2006:
1.326 brad 298: A problem in isakmpd(8) caused IPsec to run partly without replay
299: protection.</a>
1.333 deraadt 300: <li><a href="errata39.html#sem">Aug 25, 2006:
1.326 brad 301: It is possible to cause the kernel to panic when more than the default
302: number of sempahores have been allocated.</a>
1.333 deraadt 303: <li><a href="errata39.html#dhcpd">Aug 25, 2006:
1.326 brad 304: Due to an off-by-one error in dhcpd(8) it is possible to cause dhcpd(8)
305: to exit by sending a DHCPDISCOVER packet with a 32-byte client identifier
306: option.</a>
1.333 deraadt 307: <li><a href="errata39.html#sendmail3">Aug 25, 2006:
1.326 brad 308: A potential denial of service problem has been found in sendmail.</a>
1.333 deraadt 309: <li><a href="errata39.html#httpd">Jul 30, 2006:
1.325 brad 310: httpd(8)'s mod_rewrite has a potentially exploitable off-by-one buffer
311: overflow.</a>
1.333 deraadt 312: <li><a href="errata39.html#sendmail2">Jun 15, 2006:
1.324 brad 313: A potential denial of service problem has been found in sendmail.</a>
1.333 deraadt 314: <li><a href="errata39.html#xorg">May 2, 2006:
1.322 brad 315: A buffer overflow exists in the Render extension of the X server.</a>
1.333 deraadt 316: <li><a href="errata39.html#sendmail">Mar 25, 2006:
1.321 brad 317: A race condition has been reported to exist in the handling by sendmail
318: of asynchronous signals.</a>
319: </ul>
320:
1.338 miod 321: <p>
322: OpenBSD 3.8 and earlier releases are not supported anymore. The following
323: paragraphs only list advisories issued while they were maintained; these
324: releases are likely to be affected by the advisories for more recent releases.
325: <br>
326:
1.321 brad 327: <li>
1.318 deraadt 328: <a name="38"></a>
329:
330: <h3><font color="#e00000">OpenBSD 3.8 Security Advisories</font></h3>
331: These are the OpenBSD 3.8 advisories -- all these problems are solved
332: in <a href=anoncvs.html>OpenBSD current</a> and the
333: <a href=stable.html>patch branch</a>.
334:
335: <p>
336: <ul>
1.332 brad 337: <li><a href="errata38.html#ssh2">Oct 12, 2006:
338: Fix 2 security bugs found in OpenSSH.</a>
1.330 brad 339: <li><a href="errata38.html#systrace">Oct 7, 2006:
1.331 brad 340: Fix for an integer overflow in systrace(4)'s STRIOCREPLACE support,
1.330 brad 341: found by Chris Evans.</a>
342: <li><a href="errata38.html#openssl2">Oct 7, 2006:
343: Several problems have been found in OpenSSL.</a>
344: <li><a href="errata38.html#httpd2">Oct 7, 2006:
345: httpd(8) does not sanitize the Expect header from an HTTP request
346: when it is reflected back in an error message, which might allow
347: cross-site scripting (XSS) style attacks.</a>
1.329 brad 348: <li><a href="errata38.html#openssl">Sep 8, 2006:
349: Due to incorrect PKCS#1 v1.5 padding validation in OpenSSL, it is
350: possible for an attacker to construct an invalid signature which
351: OpenSSL would accept as a valid PKCS#1 v1.5 signature.</a>
1.328 brad 352: <li><a href="errata38.html#bind">Sep 8, 2006:
353: Two Denial of Service issues have been found with BIND.</a>
1.327 brad 354: <li><a href="errata38.html#sppp">Sep 2, 2006:
355: Due to the failure to correctly validate LCP configuration option
356: lengths, it is possible for an attacker to send LCP packets via an
357: sppp(4) connection causing the kernel to panic.</a>
1.326 brad 358: <li><a href="errata38.html#isakmpd">Aug 25, 2006:
359: A problem in isakmpd(8) caused IPsec to run partly without replay
360: protection.</a>
361: <li><a href="errata38.html#sem">Aug 25, 2006:
362: It is possible to cause the kernel to panic when more than the default
363: number of sempahores have been allocated.</a>
364: <li><a href="errata38.html#dhcpd">Aug 25, 2006:
365: Due to an off-by-one error in dhcpd(8) it is possible to cause dhcpd(8)
366: to exit by sending a DHCPDISCOVER packet with a 32-byte client identifier
367: option.</a>
368: <li><a href="errata38.html#sendmail3">Aug 25, 2006:
369: A potential denial of service problem has been found in sendmail.</a>
1.325 brad 370: <li><a href="errata38.html#httpd">Jul 30, 2006:
371: httpd(8)'s mod_rewrite has a potentially exploitable off-by-one buffer
372: overflow.</a>
1.324 brad 373: <li><a href="errata38.html#sendmail2">Jun 15, 2006:
374: A potential denial of service problem has been found in sendmail.</a>
1.322 brad 375: <li><a href="errata38.html#xorg">May 2, 2006:
376: A buffer overflow exists in the Render extension of the X server.</a>
1.321 brad 377: <li><a href="errata38.html#sendmail">Mar 25, 2006:
378: A race condition has been reported to exist in the handling by sendmail
379: of asynchronous signals.</a>
380: <li><a href="errata38.html#ssh">Feb 12, 2006:
1.320 brad 381: Josh Bressers has reported a weakness in OpenSSH caused due to the
382: insecure use of the system(3) function in scp(1) when performing copy
383: operations using filenames that are supplied by the user from the
384: command line.</a>
1.321 brad 385: <li><a href="errata38.html#fd">Jan 5, 2006:
1.319 brad 386: Do not allow users to trick suid programs into re-opening files via
387: /dev/fd.</a>
1.321 brad 388: <li><a href="errata38.html#perl">Jan 5, 2006:
1.319 brad 389: A buffer overflow has been found in the Perl interpreter with the
390: sprintf function which may be exploitable under certain conditions.</a>
1.318 deraadt 391: </ul>
392:
393: <li>
1.312 david 394: <a name="37"></a>
395:
396: <h3><font color="#e00000">OpenBSD 3.7 Security Advisories</font></h3>
397: These are the OpenBSD 3.7 advisories -- all these problems are solved
1.323 steven 398: in <a href="anoncvs.html">OpenBSD current</a>. The
399: <a href="stable.html">patch branch</a> for 3.7 is no longer being maintained,
400: you should update your machine.
1.312 david 401:
402: <p>
403: <ul>
1.322 brad 404: <li><a href="errata37.html#xorg">May 2, 2006:
405: A buffer overflow exists in the Render extension of the X server.</a>
1.321 brad 406: <li><a href="errata37.html#sendmail">Mar 25, 2006:
407: A race condition has been reported to exist in the handling by sendmail
408: of asynchronous signals.</a>
1.320 brad 409: <li><a href="errata37.html#ssh">Feb 12, 2006:
410: Josh Bressers has reported a weakness in OpenSSH caused due to the
411: insecure use of the system(3) function in scp(1) when performing copy
412: operations using filenames that are supplied by the user from the
413: command line.</a>
1.319 brad 414: <li><a href="errata37.html#fd">Jan 5, 2006:
415: Do not allow users to trick suid programs into re-opening files via
416: /dev/fd.</a>
417: <li><a href="errata37.html#perl">Jan 5, 2006:
418: A buffer overflow has been found in the Perl interpreter with the
419: sprintf function which may be exploitable under certain conditions.</a>
1.318 deraadt 420: <li><a href="errata37.html#libz2">Jul 21, 2005:
1.317 millert 421: Fix another buffer overflow in the zlib library that may be exploitable.</a>
1.318 deraadt 422: <li><a href="errata37.html#libz">Jul 6, 2005:
1.316 millert 423: Fix a buffer overflow in the zlib library that may be exploitable.</a>
1.318 deraadt 424: <li><a href="errata37.html#sudo">Jun 20, 2005:
1.316 millert 425: Fix a race condition in sudo(8) that could allow a user
1.315 millert 426: to run arbitrary commands.</a>
1.318 deraadt 427: <li><a href="errata37.html#cvs">Jun 7, 2005:
1.313 brad 428: Fix a buffer overflow, memory leaks, and NULL pointer
429: dereference in cvs(1).</a>
1.312 david 430: </ul>
431:
432: <li>
1.301 miod 433: <a name="36"></a>
434:
435: <h3><font color="#e00000">OpenBSD 3.6 Security Advisories</font></h3>
436: These are the OpenBSD 3.6 advisories -- all these problems are solved
1.323 steven 437: in <a href="anoncvs.html">OpenBSD current</a>. The
438: <a href="stable.html">patch branch</a> for 3.6 is no longer being maintained,
439: you should update your machine.
1.301 miod 440:
441: <p>
1.302 markus 442: <ul>
1.317 millert 443: <li><a href="errata36.html#libz2">Jul 21, 2005:
444: Fix another buffer overflow in the zlib library that may be exploitable.</a>
1.316 millert 445: <li><a href="errata36.html#libz">Jul 6, 2005:
446: Fix a buffer overflow in the zlib library that may be exploitable.</a>
1.315 millert 447: <li><a href="errata36.html#sudo">Jun 20, 2005:
1.316 millert 448: Fix a race condition in sudo(8) that could allow a user
1.315 millert 449: to run arbitrary commands.</a>
1.311 deraadt 450: <li><a href="errata36.html#cvs">Apr 28, 2005:
1.310 brad 451: Fix a buffer overflow, memory leaks, and NULL pointer
452: dereference in cvs(1).</a>
1.311 deraadt 453: <li><a href="errata36.html#telnet">Mar 30, 2005:
1.309 brad 454: Due to buffer overflows in telnet(1), a malicious
455: server or man-in-the-middle attack could allow
456: execution of arbitrary code with the privileges of
457: the user invoking telnet(1).</a>
1.311 deraadt 458: <li><a href="errata36.html#copy">Mar 16, 2005:
1.307 brad 459: More stringent checking should be done in the copy(9)
460: functions to prevent their misuse.</a>
1.311 deraadt 461: <li><a href="errata36.html#locore">Feb 28, 2005:
1.306 brad 462: More stringent checking should be done in the copy(9)
463: functions to prevent their misuse.</a>
1.311 deraadt 464: <li><a href="errata36.html#httpd">Jan 12, 2005:
1.304 brad 465: httpd(8)'s mod_include module fails to properly validate
466: the length of user supplied tag strings prior to copying
1.305 brad 467: them to a local buffer, causing a buffer overflow.</a>
1.311 deraadt 468: <li><a href="errata36.html#pfkey">Dec 14, 2004:
1.302 markus 469: On systems running isakmpd(8) it is possible for a local
470: user to cause kernel memory corruption and system panic by
1.303 markus 471: setting ipsec(4) credentials on a socket.</a>
1.302 markus 472: </ul>
1.301 miod 473:
474: <li>
1.288 matthieu 475: <a name="35"></a>
1.279 deraadt 476:
1.294 david 477: <h3><font color="#e00000">OpenBSD 3.5 Security Advisories</font></h3>
1.279 deraadt 478: These are the OpenBSD 3.5 advisories -- all these problems are solved
1.314 miod 479: in <a href="anoncvs.html">OpenBSD current</a>. The
480: <a href="stable.html">patch branch</a> for 3.5 is no longer being maintained,
481: you should update your machine.
1.279 deraadt 482:
483: <p>
484: <ul>
1.310 brad 485: <li><a href="errata35.html#cvs4">Apr 28, 2005:
486: Fix a buffer overflow, memory leaks, and NULL pointer
487: dereference in cvs(1).</a>
1.309 brad 488: <li><a href="errata35.html#telnet">Mar 30, 2005:
489: Due to buffer overflows in telnet(1), a malicious
490: server or man-in-the-middle attack could allow
491: execution of arbitrary code with the privileges of
492: the user invoking telnet(1).</a>
1.308 brad 493: <li><a href="errata35.html#copy">Mar 16, 2005:
1.307 brad 494: More stringent checking should be done in the copy(9)
495: functions to prevent their misuse.</a>
1.306 brad 496: <li><a href="errata35.html#locore">Feb 28, 2005:
497: More stringent checking should be done in the copy(9)
498: functions to prevent their misuse.</a>
1.304 brad 499: <li><a href="errata35.html#httpd3">Jan 12, 2005:
500: httpd(8)'s mod_include module fails to properly validate
501: the length of user supplied tag strings prior to copying
1.305 brad 502: them to a local buffer, causing a buffer overflow.</a>
1.302 markus 503: <li><a href="errata35.html#pfkey">Dec 14, 2004:
504: On systems running isakmpd(8) it is possible for a local
505: user to cause kernel memory corruption and system panic by
1.303 markus 506: setting ipsec(4) credentials on a socket.</a>
1.301 miod 507: <li><a href="errata35.html#radius">Sep 20, 2004:
1.299 millert 508: Radius-based authentication is vulnerable to spoofed replies.</a>
1.301 miod 509: <li><a href="errata35.html#xpm">Sep 16, 2004:
1.298 brad 510: The Xpm library has vulnerabilities when parsing malicious images.</a>
1.301 miod 511: <li><a href="errata35.html#httpd2"> Sep 10, 2004:
1.297 brad 512: httpd(8)'s mod_rewrite module can be made to write one zero byte in
513: an arbitrary memory position outside of a char array, causing a DoS
514: or possibly buffer overflows.</a>
1.301 miod 515: <li><a href="errata35.html#httpd"> Jun 12, 2004:
1.300 deraadt 516: Multiple vulnerabilities have been found in httpd(8) / mod_ssl.</a>
1.301 miod 517: <li><a href="errata35.html#isakmpd"> Jun 10, 2004:
1.291 hshoexer 518: isakmpd(8) still has issues with unauthorized SA deletion,
1.293 brad 519: an attacker can delete IPsec tunnels at will.</a>
1.301 miod 520: <li><a href="errata35.html#cvs3"> Jun 9, 2004:
1.290 millert 521: Multiple remote vulnerabilities have been found in the cvs(1)
522: server which can be used by CVS clients to crash or execute
1.293 brad 523: arbitrary code on the server.</a>
1.301 miod 524: <li><a href="errata35.html#kerberos"> May 30, 2004:
1.289 beck 525: kdc(8) performs inadequate checking of request fields, leading
526: to the possibility of principal impersonation from other
527: Kerberos realms if they are trusted with a cross-realm trust.</a>
1.301 miod 528: <li><a href="errata35.html#xdm"> May 26, 2004:
1.287 matthieu 529: xdm(1) ignores the requestPort resource and creates a
1.293 brad 530: listening socket regardless of the setting in xdm-config.</a>
1.301 miod 531: <li><a href="errata35.html#cvs2"> May 20, 2004:
1.286 otto 532: A buffer overflow in the cvs(1) server has been found,
533: which can be used by CVS clients to execute arbitrary code on
1.293 brad 534: the server.</a>
1.301 miod 535: <li><a href="errata35.html#procfs"> May 13, 2004:
1.282 tedu 536: Integer overflow problems were found in procfs, allowing
1.293 brad 537: reading of arbitrary kernel memory.</a>
1.301 miod 538: <li><a href="errata35.html#cvs"> May 5, 2004:
1.281 otto 539: Pathname validation problems have been found in cvs(1),
540: allowing clients and servers access to files outside the
1.293 brad 541: repository or local CVS tree.</a>
1.279 deraadt 542: </ul>
543:
544: <p>
545: <li>
1.288 matthieu 546: <a name="34"></a>
1.261 david 547:
1.294 david 548: <h3><font color="#e00000">OpenBSD 3.4 Security Advisories</font></h3>
1.261 david 549: These are the OpenBSD 3.4 advisories -- all these problems are solved
1.301 miod 550: in <a href="anoncvs.html">OpenBSD current</a>. The
551: <a href="stable.html">patch branch</a> for 3.4 is no longer being maintained,
552: you should update your machine.
1.261 david 553: <p>
554: <ul>
1.302 markus 555: <li><a href="errata34.html#pfkey">Dec 14, 2004:
556: On systems running isakmpd(8) it is possible for a local
557: user to cause kernel memory corruption and system panic by
1.303 markus 558: setting ipsec(4) credentials on a socket.</a>
1.298 brad 559: <li><a href="errata34.html#xpm">Sep 16, 2004:
560: The Xpm library has vulnerabilities when parsing malicious images.</a>
1.297 brad 561: <li><a href="errata34.html#httpd4"> Sep 10, 2004:
562: httpd(8)'s mod_rewrite module can be made to write one zero byte in
563: an arbitrary memory position outside of a char array, causing a DoS
564: or possibly buffer overflows.</a>
1.294 david 565: <li><a href="errata34.html#httpd3"> Jun 12, 2004:
1.300 deraadt 566: Multiple vulnerabilities have been found in httpd(8) / mod_ssl.</a>
1.294 david 567: <li><a href="errata34.html#isakmpd3"> Jun 10, 2004:
1.292 brad 568: isakmpd(8) still has issues with unauthorized SA deletion,
1.293 brad 569: an attacker can delete IPsec tunnels at will.</a>
1.294 david 570: <li><a href="errata34.html#cvs3"> Jun 9, 2004:
1.290 millert 571: Multiple remote vulnerabilities have been found in the cvs(1)
572: server which can be used by CVS clients to crash or execute
1.293 brad 573: arbitrary code on the server.</a>
1.294 david 574: <li><a href="errata34.html#kerberos"> May 30, 2004:
1.289 beck 575: kdc(8) performs inadequate checking of request fields, leading
576: to the possibility of principal impersonation from other
577: Kerberos realms if they are trusted with a cross-realm trust.</a>
1.294 david 578: <li><a href="errata34.html#cvs2"> May 20, 2004:
1.286 otto 579: A buffer overflow in the cvs(1) server has been found,
580: which can be used by CVS clients to execute arbitrary code on
581: the server.</a>
1.294 david 582: <li><a href="errata34.html#procfs"> May 13, 2004:
1.282 tedu 583: Integer overflow problems were found in procfs, allowing
584: reading of arbitrary kernel memory.</a>
1.294 david 585: <li><a href="errata34.html#cvs"> May 5, 2004:
1.281 otto 586: Pathname validation problems have been found in cvs(1),
587: allowing clients and servers access to files outside the
588: repository or local CVS tree.</a>
1.294 david 589: <li><a href="errata34.html#openssl"> March 17, 2004:
1.277 millert 590: A missing check for a NULL-pointer dereference may allow a
1.281 otto 591: remote attacker to crash applications using OpenSSL.</a>
1.294 david 592: <li><a href="errata34.html#isakmpd2"> March 17, 2004:
1.276 brad 593: Defects in the payload validation and processing functions of
594: isakmpd have been discovered. An attacker could send malformed
595: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.294 david 596: <li><a href="errata34.html#httpd2"> March 13, 2004:
1.275 brad 597: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
598: access module, using IP addresses without a netmask on big endian
599: 64-bit platforms causes the rules to fail to match.</a>
1.294 david 600: <li><a href="errata34.html#ip6"> February 8, 2004:
1.272 dhartmei 601: An IPv6 MTU handling problem exists that could be used by an
602: attacker to cause a denial of service attack.</a>
1.294 david 603: <li><a href="errata34.html#sysvshm"> February 5, 2004:
1.271 millert 604: A reference counting bug in shmat(2) could be used to write to
605: kernel memory under certain circumstances.</a>
1.294 david 606: <li><a href="errata34.html#isakmpd">January 13, 2004:
1.266 brad 607: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 608: by Thomas Walpuski.</a>
1.294 david 609: <li><a href="errata34.html#ibcs2">November 17, 2003:
1.264 henning 610: It may be possible for a local user to overrun the stack in
611: compat_ibcs2(8) and cause a kernel panic.</a>
1.294 david 612: <li><a href="errata34.html#asn1">November 1, 2003:
1.262 margarid 613: The use of certain ASN.1 encodings or malformed public keys may
614: allow an attacker to mount a denial of service attack against
615: applications linked with ssl(3).</a>
1.261 david 616: </ul>
617:
618: <li>
1.288 matthieu 619: <a name="33"></a>
1.246 deraadt 620:
1.294 david 621: <h3><font color="#e00000">OpenBSD 3.3 Security Advisories</font></h3>
1.246 deraadt 622: These are the OpenBSD 3.3 advisories -- all these problems are solved
1.294 david 623: in <a href="anoncvs.html">OpenBSD current</a>. The
624: <a href="stable.html">patch branch</a> for 3.3 is no longer being maintained,
1.284 otto 625: you should update your machine.
1.246 deraadt 626: <p>
627: <ul>
1.294 david 628: <li><a href="errata33.html#cvs"> May 5, 2004:
1.281 otto 629: Pathname validation problems have been found in cvs(1),
630: allowing clients and servers access to files outside the
631: repository or local CVS tree.</a>
1.294 david 632: <li><a href="errata33.html#openssl"> March 17, 2004:
1.277 millert 633: A missing check for a NULL-pointer dereference may allow a
1.281 otto 634: remote attacker to crash applications using OpenSSL.</a>
1.294 david 635: <li><a href="errata33.html#isakmpd2"> March 17, 2004:
1.276 brad 636: Defects in the payload validation and processing functions of
637: isakmpd have been discovered. An attacker could send malformed
638: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.294 david 639: <li><a href="errata33.html#httpd2"> March 13, 2004:
1.275 brad 640: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
641: access module, using IP addresses without a netmask on big endian
642: 64-bit platforms causes the rules to fail to match.</a>
1.294 david 643: <li><a href="errata33.html#ip6"> February 8, 2004:
1.275 brad 644: An IPv6 MTU handling problem exists that could be used by an
645: attacker to cause a denial of service attack.</a>
1.294 david 646: <li><a href="errata33.html#sysvshm"> February 5, 2004:
1.271 millert 647: A reference counting bug in shmat(2) could be used to write to
648: kernel memory under certain circumstances.</a>
1.294 david 649: <li><a href="errata33.html#isakmpd">January 15, 2004:
1.268 brad 650: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 651: by Thomas Walpuski.</a>
1.294 david 652: <li><a href="errata33.html#ibcs2">November 17, 2003:
1.264 henning 653: It may be possible for a local user to execute arbitrary code
654: resulting in escalation of privileges due to a stack overrun
655: in compat_ibcs2(8).</a>
1.294 david 656: <li><a href="errata33.html#asn1">October 1, 2003:
1.257 millert 657: The use of certain ASN.1 encodings or malformed public keys may
658: allow an attacker to mount a denial of service attack against
659: applications linked with ssl(3).</a>
1.294 david 660: <li><a href="errata33.html#pfnorm">September 24, 2003:
1.258 beck 661: Access of freed memory in pf(4) could be used to
1.260 margarid 662: remotely panic a machine using scrub rules.</a>
1.294 david 663: <li><a href="errata33.html#sendmail">September 17, 2003:
1.256 millert 664: A buffer overflow in the address parsing in
665: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 666: <li><a href="errata33.html#sshbuffer">September 16, 2003:
1.255 millert 667: OpenSSH versions prior to 3.7 contains a buffer management error
668: that is potentially exploitable.</a>
1.294 david 669: <li><a href="errata33.html#sysvsem">September 10, 2003:
1.254 millert 670: Root may be able to reduce the security level by taking advantage of
671: an integer overflow when the semaphore limits are made very large.</a>
1.294 david 672: <li><a href="errata33.html#semget">August 20, 2003:
1.252 millert 673: An improper bounds check in the kernel may allow a local user
674: to panic the kernel.</a>
1.294 david 675: <li><a href="errata33.html#realpath">August 4, 2003:
1.249 millert 676: An off-by-one error exists in the C library function realpath(3)
677: may allow an attacker to gain escalated privileges.</a>
1.246 deraadt 678: </ul>
679:
1.265 miod 680:
1.247 david 681: <p>
1.246 deraadt 682: <li>
1.288 matthieu 683: <a name="32"></a>
1.224 deraadt 684:
1.294 david 685: <h3><font color="#e00000">OpenBSD 3.2 Security Advisories</font></h3>
1.224 deraadt 686: These are the OpenBSD 3.2 advisories -- all these problems are solved
1.294 david 687: in <a href="anoncvs.html">OpenBSD current</a>. The
688: <a href="stable.html">patch branch</a> for 3.2 is no longer being maintained,
1.265 miod 689: you should update your machine.
1.224 deraadt 690: <p>
691: <ul>
1.294 david 692: <li><a href="errata32.html#asn1">October 1, 2003:
1.257 millert 693: The use of certain ASN.1 encodings or malformed public keys may
694: allow an attacker to mount a denial of service attack against
695: applications linked with ssl(3). This does not affect OpenSSH.</a>
1.294 david 696: <li><a href="errata32.html#pfnorm">September 24, 2003:
1.258 beck 697: Access of freed memory in pf(4) could be used to
1.260 margarid 698: remotely panic a machine using scrub rules.</a>
1.294 david 699: <li><a href="errata32.html#sendmail4">September 17, 2003:
1.256 millert 700: A buffer overflow in the address parsing in
701: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 702: <li><a href="errata32.html#sshbuffer">September 16, 2003:
1.255 millert 703: OpenSSH versions prior to 3.7 contains a buffer management error
704: that is potentially exploitable.</a>
1.294 david 705: <li><a href="errata32.html#sendmail3">August 25, 2003:
1.253 brad 706: Fix for a potential security issue in
707: sendmail(8) with respect to DNS maps.</a>
1.294 david 708: <li><a href="errata32.html#realpath">August 4, 2003:
1.249 millert 709: An off-by-one error exists in the C library function realpath(3)
710: may allow an attacker to gain escalated privileges.</a>
1.294 david 711: <li><a href="errata32.html#sendmail2">March 31, 2003:
1.244 miod 712: A buffer overflow in the address parsing in
713: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 714: <li><a href="errata32.html#kerberos">March 24, 2003:
1.242 millert 715: A cryptographic weaknesses in the Kerberos v4 protocol can be
716: exploited on Kerberos v5 as well.</a>
1.294 david 717: <li><a href="errata32.html#kpr">March 19, 2003:
1.241 jufi 718: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 719: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.294 david 720: <li><a href="errata32.html#blinding">March 18, 2003:
1.239 miod 721: Various SSL and TLS operations in OpenSSL are vulnerable to
722: timing attacks.</a>
1.294 david 723: <li><a href="errata32.html#lprm">March 5, 2003:
1.238 millert 724: A buffer overflow in lprm(1) may allow an attacker to elevate
725: privileges to user daemon.</a>.
1.294 david 726: <li><a href="errata32.html#sendmail">March 3, 2003:
1.237 miod 727: A buffer overflow in the envelope comments processing in
728: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 729: <li><a href="errata32.html#httpd">February 25, 2003:
1.236 margarid 730: httpd(8) leaks file inode numbers via ETag header as well as
731: child PIDs in multipart MIME boundary generation. This could
732: lead, for example, to NFS exploitation because it uses inode
733: numbers as part of the file handle.</a>
1.294 david 734: <li><a href="errata32.html#ssl">February 22, 2003:
1.234 margarid 735: In ssl(8) an information leak can occur via timing by performing
736: a MAC computation even if incorrect block cipher padding has
737: been found, this is a countermeasure. Also, check for negative
738: sizes, in allocation routines.</a>
1.294 david 739: <li><a href="errata32.html#cvs">January 20, 2003:
1.232 millert 740: A double free exists in cvs(1) that could lead to privilege
741: escalation for cvs configurations where the cvs command is
1.233 margarid 742: run as a privileged user.</a>
1.294 david 743: <li><a href="errata32.html#named">November 14, 2002:
1.230 millert 744: A buffer overflow exists in named(8) that could lead to a
745: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 746: <li><a href="errata32.html#pool">November 6, 2002:
1.233 margarid 747: A logic error in the pool kernel memory allocator could cause
748: memory corruption in low-memory situations, causing the system
749: to crash.</a>
1.294 david 750: <li><a href="errata32.html#smrsh">November 6, 2002:
1.229 miod 751: An attacker can bypass smrsh(8)'s restrictions and execute
752: arbitrary commands with the privileges of his own account.</a>
1.294 david 753: <li><a href="errata32.html#pfbridge">November 6, 2002:
1.233 margarid 754: Network bridges running pf with scrubbing enabled could cause
755: mbuf corruption, causing the system to crash.</a>
1.294 david 756: <li><a href="errata32.html#kadmin">October 21, 2002:
1.228 miod 757: A buffer overflow can occur in the kadmind(8) daemon, leading
758: to possible remote crash or exploit.</a>
1.224 deraadt 759: </ul>
760:
1.227 miod 761: <p>
762: <li>
1.288 matthieu 763: <a name="31"></a>
1.203 deraadt 764:
1.294 david 765: <h3><font color="#e00000">OpenBSD 3.1 Security Advisories</font></h3>
1.203 deraadt 766: These are the OpenBSD 3.1 advisories -- all these problems are solved
1.294 david 767: in <a href="anoncvs.html">OpenBSD current</a>. The
768: <a href="stable.html">patch branch</a> for 3.1 is no longer being maintained,
1.258 beck 769: you should update your machine.
1.203 deraadt 770:
771: <p>
772: <ul>
1.294 david 773: <li><a href="errata31.html#sendmail2">March 31, 2003:
1.244 miod 774: A buffer overflow in the address parsing in
775: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 776: <li><a href="errata31.html#kerberos">March 24, 2003:
1.242 millert 777: A cryptographic weaknesses in the Kerberos v4 protocol can be
778: exploited on Kerberos v5 as well.</a>
1.294 david 779: <li><a href="errata31.html#kpr">March 19, 2003:
1.241 jufi 780: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 781: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.294 david 782: <li><a href="errata31.html#blinding">March 18, 2003:
1.239 miod 783: Various SSL and TLS operations in OpenSSL are vulnerable to
784: timing attacks.</a>
1.294 david 785: <li><a href="errata31.html#lprm">March 4, 2003:
1.238 millert 786: A buffer overflow in lprm(1) may allow an attacker to gain
787: root privileges.</a>
1.294 david 788: <li><a href="errata31.html#sendmail">March 3, 2003:
1.237 miod 789: A buffer overflow in the envelope comments processing in
790: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 791: <li><a href="errata31.html#ssl2">February 23, 2003:
1.235 miod 792: In ssl(8) an information leak can occur via timing by performing
793: a MAC computation even if incorrect block cipher padding has
794: been found, this is a countermeasure. Also, check for negative
795: sizes, in allocation routines.</a>
1.294 david 796: <li><a href="errata31.html#cvs">January 20, 2003:
1.232 millert 797: A double free exists in cvs(1) that could lead to privilege
798: escalation for cvs configurations where the cvs command is
1.294 david 799: run as a privileged user</a>.
800: <li><a href="errata31.html#named">November 14, 2002:
1.230 millert 801: A buffer overflow exists in named(8) that could lead to a
802: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 803: <li><a href="errata31.html#kernresource">November 6, 2002:
1.229 miod 804: Incorrect argument checking in the getitimer(2) system call
805: may allow an attacker to crash the system.</a>
1.294 david 806: <li><a href="errata31.html#smrsh">November 6, 2002:
1.229 miod 807: An attacker can bypass smrsh(8)'s restrictions and execute
808: arbitrary commands with the privileges of his own account.</a>
1.294 david 809: <li><a href="errata31.html#kadmin">October 21, 2002:
1.226 miod 810: A buffer overflow can occur in the kadmind(8) daemon, leading
811: to possible remote crash or exploit.</a>
1.294 david 812: <li><a href="errata31.html#kerntime">October 2, 2002:
1.222 jason 813: Incorrect argument checking in the setitimer(2) system call
814: may allow an attacker to write to kernel memory.</a>
1.294 david 815: <li><a href="errata31.html#scarg">August 11, 2002:
1.221 provos 816: An insufficient boundary check in the select system call
1.220 miod 817: allows an attacker to overwrite kernel memory and execute arbitrary code
818: in kernel context.</a>
1.294 david 819: <li><a href="errata31.html#ssl">July 30, 2002:
1.218 miod 820: Several remote buffer overflows can occur in the SSL2 server and SSL3
821: client of the ssl(8) library, as in the ASN.1 parser code in the
822: crypto(3) library, all of them being potentially remotely
823: exploitable.</a>
1.294 david 824: <li><a href="errata31.html#xdr">July 29, 2002:
1.218 miod 825: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
826: possible remote crash.</a>
1.294 david 827: <li><a href="errata31.html#pppd">July 29, 2002:
1.218 miod 828: A race condition exists in the pppd(8) daemon which may cause it to
829: alter the file permissions of an arbitrary file.</a>
1.294 david 830: <li><a href="errata31.html#isakmpd">July 5, 2002:
1.218 miod 831: Receiving IKE payloads out of sequence can cause isakmpd(8) to
832: crash.</a>
1.294 david 833: <li><a href="errata31.html#ktrace">June 27, 2002:
1.215 miod 834: The kernel would let any user ktrace set[ug]id processes.</a>
1.294 david 835: <li><a href="errata31.html#modssl">June 26, 2002:
1.213 miod 836: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 837: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.294 david 838: <li><a href="errata31.html#resolver">June 25, 2002:
1.212 millert 839: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 840: <li><a href="errata31.html#sshd">June 24, 2002:
1.216 deraadt 841: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 842: input validation error that can result in an integer overflow and
843: privilege escalation.</a>
1.294 david 844: <li><a href="errata31.html#httpd">June 19, 2002:
1.211 miod 845: A buffer overflow can occur during the interpretation of chunked
846: encoding in httpd(8), leading to possible remote crash.</a>
1.294 david 847: <li><a href="errata31.html#sshbsdauth">May 22, 2002:
1.209 markus 848: Under certain conditions, on systems using YP with netgroups
849: in the password database, it is possible that sshd(8) does
850: ACL checks for the requested user name but uses the password
851: database entry of a different user for authentication. This
852: means that denied users might authenticate successfully
853: while permitted users could be locked out.</a>
1.294 david 854: <li><a href="errata31.html#fdalloc2">May 8, 2002:
1.208 millert 855: A race condition exists that could defeat the kernel's
856: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 857: <li><a href="errata31.html#sudo">April 25, 2002:
1.205 millert 858: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 859: <li><a href="errata31.html#sshafs">April 22, 2002:
1.205 millert 860: A local user can gain super-user privileges due to a buffer
861: overflow in sshd(8) if AFS has been configured on the system
862: or if KerberosTgtPassing or AFSTokenPassing has been enabled
863: in the sshd_config file.</a>
1.203 deraadt 864: </ul>
865:
1.235 miod 866: <p>
1.203 deraadt 867: <li>
1.288 matthieu 868: <a name="30"></a>
1.187 deraadt 869:
1.294 david 870: <h3><font color="#e00000">OpenBSD 3.0 Security Advisories</font></h3>
1.187 deraadt 871: These are the OpenBSD 3.0 advisories -- all these problems are solved
1.294 david 872: in <a href="anoncvs.html">OpenBSD current</a>. The
873: <a href="stable.html">patch branch</a> for 3.0 is no longer being maintained,
1.258 beck 874: you should update your machine.
1.187 deraadt 875:
876: <p>
877: <ul>
1.294 david 878: <li><a href="errata30.html#named">November 14, 2002:
1.230 millert 879: A buffer overflow exists in named(8) that could lead to a
880: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 881: <li><a href="errata30.html#kernresource">November 6, 2002:
1.229 miod 882: Incorrect argument checking in the getitimer(2) system call
883: may allow an attacker to crash the system.</a>
1.294 david 884: <li><a href="errata30.html#smrsh">November 6, 2002:
1.229 miod 885: An attacker can bypass smrsh(8)'s restrictions and execute
886: arbitrary commands with the privileges of his own account.</a>
1.294 david 887: <li><a href="errata30.html#kadmin">October 21, 2002:
1.226 miod 888: A buffer overflow can occur in the kadmind(8) daemon, leading
889: to possible remote crash or exploit.</a>
1.294 david 890: <li><a href="errata30.html#kerntime">October 7, 2002:
1.223 miod 891: Incorrect argument checking in the setitimer(2) system call
892: may allow an attacker to write to kernel memory.</a>
1.294 david 893: <li><a href="errata30.html#scarg">August 11, 2002:
1.220 miod 894: An insufficient boundary check in the select and poll system calls
895: allows an attacker to overwrite kernel memory and execute arbitrary code
896: in kernel context.</a>
1.294 david 897: <li><a href="errata30.html#ssl">July 30, 2002:
1.218 miod 898: Several remote buffer overflows can occur in the SSL2 server and SSL3
899: client of the ssl(8) library, as in the ASN.1 parser code in the
900: crypto(3) library, all of them being potentially remotely
901: exploitable.</a>
1.294 david 902: <li><a href="errata30.html#xdr">July 29, 2002:
1.218 miod 903: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
904: possible remote crash.</a>
1.294 david 905: <li><a href="errata30.html#pppd">July 29, 2002:
1.218 miod 906: A race condition exists in the pppd(8) daemon which may cause it to
907: alter the file permissions of an arbitrary file.</a>
1.294 david 908: <li><a href="errata30.html#isakmpd2">July 5, 2002:
1.218 miod 909: Receiving IKE payloads out of sequence can cause isakmpd(8) to
910: crash.</a>
1.294 david 911: <li><a href="errata30.html#ktrace">June 27, 2002:
1.215 miod 912: The kernel would let any user ktrace set[ug]id processes.</a>
1.294 david 913: <li><a href="errata30.html#resolver">June 25, 2002:
1.212 millert 914: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 915: <li><a href="errata30.html#sshdauth">June 24, 2002:
1.216 deraadt 916: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 917: input validation error that can result in an integer overflow and
918: privilege escalation.</a>
1.294 david 919: <li><a href="errata30.html#modssl">June 24, 2002:
1.213 miod 920: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 921: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.294 david 922: <li><a href="errata30.html#httpd">June 19, 2002:
1.213 miod 923: A buffer overflow can occur during the interpretation of chunked
924: encoding in httpd(8), leading to possible remote crash.</a>
1.294 david 925: <li><a href="errata30.html#fdalloc2">May 8, 2002:
1.208 millert 926: A race condition exists that could defeat the kernel's
927: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 928: <li><a href="errata30.html#sudo2">April 25, 2002:
1.205 millert 929: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 930: <li><a href="errata30.html#sshafs">April 22, 2002:
1.205 millert 931: A local user can gain super-user privileges due to a buffer
932: overflow in sshd(8) if AFS has been configured on the system
933: or if KerberosTgtPassing or AFSTokenPassing has been enabled
934: in the sshd_config file.</a>
1.294 david 935: <li><a href="errata30.html#mail">April 11, 2002:
1.202 millert 936: The mail(1) was interpreting tilde escapes even when invoked
937: in non-interactive mode. As mail(1) is called as root from cron,
938: this can lead to a local root compromise.</a>
1.294 david 939: <li><a href="errata30.html#approval">March 19, 2002:
1.201 millert 940: Under certain conditions, on systems using YP with netgroups in
941: the password database, it is possible for the rexecd(8) and rshd(8)
942: daemons to execute a shell from a password database entry for a
943: different user. Similarly, atrun(8) may change to the wrong
944: home directory when running jobs.</a>
1.294 david 945: <li><a href="errata30.html#zlib">March 13, 2002:
1.200 millert 946: A potential double free() exists in the zlib library;
947: this is not exploitable on OpenBSD.
948: The kernel also contains a copy of zlib; it is not
949: currently known if the kernel zlib is exploitable.</a>
1.294 david 950: <li><a href="errata30.html#openssh">March 8, 2002:
1.198 millert 951: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 952: may allow a local user to gain super-user privileges.</a>
1.294 david 953: <li><a href="errata30.html#ptrace">January 21, 2002:
1.192 jason 954: A race condition between the ptrace(2) and execve(2) system calls
955: allows an attacker to modify the memory contents of suid/sgid
956: processes which could lead to compromise of the super-user account.</a>
1.294 david 957: <li><a href="errata30.html#sudo">January 17, 2002:
1.191 millert 958: There is a security hole in sudo(8) that can be exploited
959: when the Postfix sendmail replacement is installed that may
960: allow an attacker on the local host to gain root privileges.</a>
1.294 david 961: <li><a href="errata30.html#lpd">November 28, 2001:
1.189 millert 962: An attacker can trick a machine running the lpd daemon into
963: creating new files in the root directory from a machine with
964: remote line printer access.</a>
1.294 david 965: <li><a href="errata30.html#vi.recover">November 13, 2001:
1.188 millert 966: The vi.recover script can be abused in such a way as
967: to cause arbitrary zero-length files to be removed.</a>
1.294 david 968: <li><a href="errata30.html#pf">November 13, 2001:
1.190 mpech 969: pf(4) was incapable of dealing with certain ipv6 icmp packets,
970: resulting in a crash.</a>
1.294 david 971: <li><a href="errata30.html#sshd">November 12, 2001:
1.190 mpech 972: A security hole that may allow an attacker to partially authenticate
973: if -- and only if -- the administrator has enabled KerberosV.</a>
1.187 deraadt 974: </ul>
975:
976: <p>
977: <li>
1.288 matthieu 978: <a name="29"></a>
1.173 deraadt 979:
1.294 david 980: <h3><font color="#e00000">OpenBSD 2.9 Security Advisories</font></h3>
1.173 deraadt 981: These are the OpenBSD 2.9 advisories -- all these problems are solved
1.294 david 982: in <a href="anoncvs.html">OpenBSD current</a>. The
983: <a href="stable.html">patch branch</a>. for 2.9 is no longer being maintained,
1.258 beck 984: you should update your machine.
985:
1.173 deraadt 986:
987: <p>
988: <ul>
1.294 david 989: <li><a href="errata29.html#resolver">June 25, 2002:
1.212 millert 990: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 991: <li><a href="errata29.html#fdalloc2">May 8, 2002:
1.208 millert 992: A race condition exists that could defeat the kernel's
993: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 994: <li><a href="errata29.html#sudo2">April 25, 2002:
1.207 millert 995: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 996: <li><a href="errata29.html#sshafs">April 22, 2002:
1.206 millert 997: A local user can gain super-user privileges due to a buffer
998: overflow in sshd(8) if AFS has been configured on the system
999: or if KerberosTgtPassing or AFSTokenPassing has been enabled
1000: in the sshd_config file.</a>
1.294 david 1001: <li><a href="errata29.html#mail">April 11, 2002:
1.202 millert 1002: The mail(1) was interpreting tilde escapes even when invoked
1003: in non-interactive mode. As mail(1) is called as root from cron,
1004: this can lead to a local root compromise.</a>
1.294 david 1005: <li><a href="errata29.html#zlib">March 13, 2002:
1.200 millert 1006: A potential double free() exists in the zlib library;
1007: this is not exploitable on OpenBSD.
1008: The kernel also contains a copy of zlib; it is not
1009: currently known if the kernel zlib is exploitable.</a>
1.294 david 1010: <li><a href="errata29.html#openssh">March 8, 2002:
1.198 millert 1011: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 1012: may allow a local user to gain super-user privileges.</a>
1.294 david 1013: <li><a href="errata29.html#ptrace">January 21, 2002:
1.198 millert 1014: A race condition between the ptrace(2) and execve(2) system calls
1015: allows an attacker to modify the memory contents of suid/sgid
1016: processes which could lead to compromise of the super-user account.</a>
1.294 david 1017: <li><a href="errata29.html#sudo">January 17, 2002:
1.191 millert 1018: There is a security hole in sudo(8) that can be exploited
1019: when the Postfix sendmail replacement is installed that may
1020: allow an attacker on the local host to gain root privileges.</a>
1.294 david 1021: <li><a href="errata29.html#lpd2">November 28, 2001:
1.189 millert 1022: An attacker can trick a machine running the lpd daemon into
1023: creating new files in the root directory from a machine with
1024: remote line printer access.</a>
1.294 david 1025: <li><a href="errata29.html#vi.recover">November 13, 2001:
1.190 mpech 1026: The vi.recover script can be abused in such a way as
1027: to cause arbitrary zero-length files to be removed.</a>
1.294 david 1028: <li><a href="errata29.html#uucp">September 11, 2001:
1.184 millert 1029: A security hole exists in uuxqt(8) that may allow an
1030: attacker to gain root privileges.</a>
1.294 david 1031: <li><a href="errata29.html#lpd">August 29, 2001:
1.183 millert 1032: A security hole exists in lpd(8) that may allow an
1033: attacker to gain root privileges if lpd is running.</a>
1.294 david 1034: <li><a href="errata29.html#sendmail2">August 21, 2001:
1.181 millert 1035: A security hole exists in sendmail(8) that may allow an
1036: attacker on the local host to gain root privileges.</a>
1.294 david 1037: <li><a href="errata29.html#nfs">July 30, 2001:
1.180 jason 1038: A kernel buffer overflow in the NFS code can be used to execute
1039: arbitrary code by users with mount privileges (only root by
1.181 millert 1040: default).</a>
1.294 david 1041: <li><a href="errata29.html#kernexec">June 15, 2001:
1.178 aaron 1042: A race condition in the kernel can lead to local root compromise.</a>
1.294 david 1043: <li><a href="errata29.html#sshcookie">June 12, 2001:
1.177 markus 1044: sshd(8) allows users to delete arbitrary files named "cookies"
1045: if X11 forwarding is enabled. X11 forwarding is disabled
1046: by default.</a>
1.294 david 1047: <li><a href="errata29.html#fts">May 30, 2001:
1.176 millert 1048: Programs using the fts routines can be tricked into changing
1049: into the wrong directory.</a>
1.294 david 1050: <li><a href="errata29.html#sendmail">May 29, 2001:
1.174 millert 1051: Sendmail signal handlers contain unsafe code,
1052: leading to numerous race conditions.</a>
1.173 deraadt 1053: </ul>
1054:
1055: <p>
1056: <li>
1.288 matthieu 1057: <a name="28"></a>
1.152 deraadt 1058:
1.294 david 1059: <h3><font color="#e00000">OpenBSD 2.8 Security Advisories</font></h3>
1.152 deraadt 1060: These are the OpenBSD 2.8 advisories -- all these problems are solved
1.294 david 1061: in <a href="anoncvs.html">OpenBSD current</a>. The
1062: <a href="stable.html">patch branch</a>. for 2.8 is no longer being maintained,
1.258 beck 1063: you should update your machine.
1064:
1.152 deraadt 1065:
1066: <p>
1067: <ul>
1.294 david 1068: <li><a href="errata28.html#uucp">September 11, 2001:
1.184 millert 1069: A security hole exists in uuxqt(8) that may allow an
1070: attacker to gain root privileges.</a>
1.294 david 1071: <li><a href="errata28.html#lpd">August 29, 2001:
1.183 millert 1072: A security hole exists in lpd(8) that may allow an
1073: attacker to gain root privileges if lpd is running.</a>
1.294 david 1074: <li><a href="errata28.html#sendmail2">August 21, 2001:
1.181 millert 1075: A security hole exists in sendmail(8) that may allow an
1076: attacker on the local host to gain root privileges.</a>
1.294 david 1077: <li><a href="errata28.html#kernexec">June 15, 2001:
1.178 aaron 1078: A race condition in the kernel can lead to local root compromise.</a>
1.294 david 1079: <li><a href="errata28.html#fts">May 30, 2001:
1.176 millert 1080: Programs using the fts routines can be tricked into changing
1081: into the wrong directory.</a>
1.294 david 1082: <li><a href="errata28.html#sendmail">May 29, 2001:
1.175 millert 1083: Sendmail signal handlers contain unsafe code,
1084: leading to numerous race conditions.</a>
1.294 david 1085: <li><a href="errata28.html#ipf_frag">Apr 23, 2001:
1.231 mickey 1086: IPF contains a serious bug with its handling of fragment caching.</a>
1.294 david 1087: <li><a href="errata28.html#glob_limit">Apr 23, 2001:
1.172 ericj 1088: ftpd(8) contains a potential DoS relating to glob(3).</a>
1.294 david 1089: <li><a href="errata28.html#glob">Apr 10, 2001:
1.170 ericj 1090: The glob(3) library call contains multiple buffer overflows.</a>
1.294 david 1091: <li><a href="errata28.html#readline">Mar 18, 2001:
1.169 millert 1092: The readline library creates history files with permissive modes based on the user's umask.</a>
1.294 david 1093: <li><a href="errata28.html#ipsec_ah">Mar 2, 2001:
1.167 ericj 1094: Insufficient checks in the IPSEC AH IPv4 option handling code can lead to a buffer overrun in the kernel.</a>
1.294 david 1095: <li><a href="errata28.html#userldt">Mar 2, 2001:
1.168 horacio 1096: The <b>USER_LDT</b> kernel option allows an attacker to gain access to privileged areas of kernel memory.</a>
1.294 david 1097: <li><a href="errata28.html#sudo">Feb 22, 2001:
1.171 millert 1098: a non-exploitable buffer overflow was fixed in sudo(8).</a>
1.294 david 1099: <li><a href="errata28.html#named">Jan 29, 2001:
1.163 jason 1100: merge named(8) with ISC BIND 4.9.8-REL, which fixes some buffer vulnerabilities.</a>
1.294 david 1101: <li><a href="errata28.html#rnd">Jan 22, 2001:
1.162 jason 1102: rnd(4) did not use all of its input when written to.</a>
1.294 david 1103: <li><a href="errata28.html#xlock">Dec 22, 2000:
1.159 ericj 1104: xlock(1)'s authentication was re-done to authenticate via a named pipe. (patch and new xlock binaries included).</a>
1.294 david 1105: <li><a href="errata28.html#procfs">Dec 18, 2000:
1.157 ericj 1106: Procfs contains numerous overflows. Procfs is not used by default in OpenBSD. (patch included).</a>
1.294 david 1107: <li><a href="errata28.html#kerberos2">Dec 10, 2000:
1.156 deraadt 1108: Another problem exists in KerberosIV libraries (patch included).</a>
1.294 david 1109: <li><a href="errata28.html#kerberos">Dec 7, 2000:
1.155 deraadt 1110: A set of problems in KerberosIV exist (patch included).</a>
1.294 david 1111: <li><a href="errata28.html#ftpd">Dec 4, 2000:
1.154 millert 1112: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.152 deraadt 1113: </ul>
1114:
1115: <p>
1116: <li>
1.288 matthieu 1117: <a name="27"></a>
1.124 deraadt 1118:
1.294 david 1119: <h3><font color="#e00000">OpenBSD 2.7 Security Advisories</font></h3>
1.124 deraadt 1120: These are the OpenBSD 2.7 advisories -- all these problems are solved
1.294 david 1121: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.124 deraadt 1122: OpenBSD 2.6 advisories listed below are fixed in OpenBSD 2.7.
1123:
1124: <p>
1125: <ul>
1.294 david 1126: <li><a href="errata27.html#readline">Mar 18, 2001:
1.169 millert 1127: The readline library creates history files with permissive modes based on the user's umask.</a>
1.294 david 1128: <li><a href="errata27.html#sudo">Feb 22, 2001:
1.169 millert 1129: a buffer overflow was fixed in sudo(8).</a>
1.294 david 1130: <li><a href="errata27.html#ftpd">Dec 4, 2000:
1.154 millert 1131: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.294 david 1132: <li><a href="errata27.html#sshforwarding">Nov 10, 2000:
1.152 deraadt 1133: Hostile servers can force OpenSSH clients to do agent or X11 forwarding.
1134: (patch included)</a>
1.294 david 1135: <li><a href="errata27.html#xtrans">Oct 26, 2000:
1.151 matthieu 1136: X11 libraries have 2 potential overflows in xtrans code.
1137: (patch included)</a>
1.294 david 1138: <li><a href="errata27.html#httpd">Oct 18, 2000:
1.150 beck 1139: Apache mod_rewrite and mod_vhost_alias modules could expose files
1140: on the server in certain configurations if used.
1141: (patch included)</a>
1.294 david 1142: <li><a href="errata27.html#telnetd">Oct 10, 2000:
1.149 millert 1143: The telnet daemon does not strip out the TERMINFO, TERMINFO_DIRS,
1144: TERMPATH and TERMCAP environment variables as it should.
1145: (patch included)</a>
1.294 david 1146: <li><a href="errata27.html#format_strings">Oct 6, 2000:
1.148 millert 1147: There are printf-style format string bugs in several privileged
1148: programs. (patch included)</a>
1.294 david 1149: <li><a href="errata27.html#curses">Oct 6, 2000:
1.147 millert 1150: libcurses honored terminal descriptions in the $HOME/.terminfo
1151: directory as well as in the TERMCAP environment variable for
1152: setuid and setgid applications.
1.146 deraadt 1153: (patch included)</a>
1.294 david 1154: <li><a href="errata27.html#talkd">Oct 6, 2000:
1.146 deraadt 1155: A format string vulnerability exists in talkd(8).
1156: (patch included)</a>
1.294 david 1157: <li><a href="errata27.html#pw_error">Oct 3, 2000:
1.145 aaron 1158: A format string vulnerability exists in the pw_error() function of the
1159: libutil library, yielding localhost root through chpass(1).
1160: (patch included)</a>
1.294 david 1161: <li><a href="errata27.html#ipsec">Sep 18, 2000:
1.144 jason 1162: Bad ESP/AH packets could cause a crash under certain conditions.
1163: (patch included)</a>
1.294 david 1164: <li><a href="errata27.html#xlock">Aug 16, 2000:
1.141 deraadt 1165: A format string vulnerability (localhost root) exists in xlock(1).
1166: (patch included)</a>
1.294 david 1167: <li><a href="errata27.html#X11_libs">July 14, 2000:
1.139 deraadt 1168: Various bugs found in X11 libraries have various side effects, almost
1169: completely denial of service in OpenBSD.
1170: (patch included)</a>
1.294 david 1171: <li><a href="errata27.html#ftpd">July 5, 2000:
1.136 deraadt 1172: Just like pretty much all the other unix ftp daemons
1173: on the planet, ftpd had a remote root hole in it.
1174: Luckily, ftpd was not enabled by default.
1.137 deraadt 1175: The problem exists if anonymous ftp is enabled.
1.136 deraadt 1176: (patch included)</a>
1.294 david 1177: <li><a href="errata27.html#mopd">July 5, 2000:
1.136 deraadt 1178: Mopd, very rarely used, contained some buffer overflows.
1179: (patch included)</a>
1.294 david 1180: <li><a href="errata27.html#libedit">June 28, 2000:
1.135 deraadt 1181: libedit would check for a <b>.editrc</b> file in the current
1182: directory. Not known to be a real security issue, but a patch
1183: is available anyways.
1184: (patch included)</a>
1.294 david 1185: <li><a href="errata27.html#dhclient">June 24, 2000:
1.134 deraadt 1186: A serious bug in dhclient(8) could allow strings from a
1187: malicious dhcp server to be executed in the shell as root.
1188: (patch included)</a>
1.294 david 1189: <li><a href="errata27.html#isakmpd">June 9, 2000:
1.133 deraadt 1190: A serious bug in isakmpd(8) policy handling wherein
1191: policy verification could be completely bypassed in isakmpd.
1192: (patch included)</a>
1.294 david 1193: <li><a href="errata27.html#uselogin">June 6, 2000:
1.132 deraadt 1194: The non-default flag UseLogin in <b>/etc/sshd_config</b> is broken,
1195: should not be used, and results in security problems on
1196: other operating systems.</a>
1.294 david 1197: <li><a href="errata27.html#bridge">May 26, 2000:
1.129 deraadt 1198: The bridge(4) <i>learning</i> flag may be bypassed.
1.128 deraadt 1199: (patch included)</a>
1.294 david 1200: <li><a href="errata27.html#ipf">May 25, 2000:
1.127 kjell 1201: Improper use of ipf <i>keep-state</i> rules can result
1202: in firewall rules being bypassed. (patch included)</a>
1203:
1.124 deraadt 1204: </ul>
1205:
1206: <p>
1207: <li>
1.288 matthieu 1208: <a name="26"></a>
1.119 deraadt 1209:
1.294 david 1210: <h3><font color="#e00000">OpenBSD 2.6 Security Advisories</font></h3>
1.119 deraadt 1211: These are the OpenBSD 2.6 advisories -- all these problems are solved
1.294 david 1212: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.119 deraadt 1213: OpenBSD 2.5 advisories listed below are fixed in OpenBSD 2.6.
1214:
1215: <p>
1216: <ul>
1.294 david 1217: <li><a href="errata26.html#semconfig">May 26, 2000:
1.130 deraadt 1218: SYSV semaphore support contained an undocumented system call
1.131 deraadt 1219: which could wedge semaphore-using processes from exiting. (patch included)</a>
1.294 david 1220: <li><a href="errata26.html#ipf">May 25, 2000:
1.127 kjell 1221: Improper use of ipf <i>keep-state</i> rules can result
1222: in firewall rules being bypassed. (patch included)</a>
1.294 david 1223: <li><a href="errata26.html#xlockmore">May 25, 2000:
1.125 deraadt 1224: xlockmore has a bug which a localhost attacker can use to gain
1225: access to the encrypted root password hash (which is normally
1.245 miod 1226: encoded using blowfish</a> (see
1.294 david 1227: <a href="http://www.openbsd.org/cgi-bin/man.cgi?query=crypt&sektion=3">
1.125 deraadt 1228: crypt(3)</a>)
1.245 miod 1229: (patch included).
1.294 david 1230: <li><a href="errata26.html#procfs">Jan 20, 2000:
1.123 deraadt 1231: Systems running with procfs enabled and mounted are
1232: vulnerable to a very tricky exploit. procfs is not
1233: mounted by default.
1234: (patch included).</a>
1.294 david 1235: <li><a href="errata26.html#sendmail">Dec 4, 1999:
1.296 david 1236: Sendmail permitted any user to cause an aliases file wrap,
1.190 mpech 1237: thus exposing the system to a race where the aliases file
1238: did not exist.
1.119 deraadt 1239: (patch included).</a>
1.294 david 1240: <li><a href="errata26.html#poll">Dec 4, 1999:
1.190 mpech 1241: Various bugs in poll(2) may cause a kernel crash.</a>
1.294 david 1242: <li><a href="errata26.html#sslUSA">Dec 2, 1999:
1.120 deraadt 1243: A buffer overflow in the RSAREF code included in the
1244: USA version of libssl, is possibly exploitable in
1245: httpd, ssh, or isakmpd, if SSL/RSA features are enabled.
1.124 deraadt 1246: (patch included).<br></a>
1247: <strong>Update:</strong> Turns out that this was not exploitable
1248: in any of the software included in OpenBSD 2.6.
1.294 david 1249: <li><a href="errata26.html#ifmedia">Nov 9, 1999:
1.190 mpech 1250: Any user could change interface media configurations, resulting in
1251: a localhost denial of service attack.
1.121 deraadt 1252: (patch included).</a>
1.119 deraadt 1253: </ul>
1254:
1255: <p>
1256: <li>
1.288 matthieu 1257: <a name="25"></a>
1.106 deraadt 1258:
1.294 david 1259: <h3><font color="#e00000">OpenBSD 2.5 Security Advisories</font></h3>
1.93 deraadt 1260: These are the OpenBSD 2.5 advisories -- all these problems are solved
1.294 david 1261: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.93 deraadt 1262: OpenBSD 2.4 advisories listed below are fixed in OpenBSD 2.5.
1263:
1.96 deraadt 1264: <p>
1.104 deraadt 1265: <ul>
1.294 david 1266: <li><a href="errata25.html#cron">Aug 30, 1999:
1.103 deraadt 1267: In cron(8), make sure argv[] is NULL terminated in the
1268: fake popen() and run sendmail as the user, not as root.
1269: (patch included).</a>
1.294 david 1270: <li><a href="errata25.html#miscfs">Aug 12, 1999: The procfs and fdescfs
1.101 deraadt 1271: filesystems had an overrun in their handling of uio_offset
1272: in their readdir() routines. (These filesystems are not
1273: enabled by default). (patch included).</a>
1.294 david 1274: <li><a href="errata25.html#profil">Aug 9, 1999: Stop profiling (see profil(2))
1.100 deraadt 1275: when we execve() a new process. (patch included).</a>
1.294 david 1276: <li><a href="errata25.html#ipsec_in_use">Aug 6, 1999: Packets that should have
1.98 deraadt 1277: been handled by IPsec may be transmitted as cleartext.
1278: PF_KEY SA expirations may leak kernel resources.
1279: (patch included).</a>
1.294 david 1280: <li><a href="errata25.html#rc">Aug 5, 1999: In /etc/rc, use mktemp(1) for
1.97 deraadt 1281: motd re-writing and change the find(1) to use -execdir
1282: (patch included).</a>
1.294 david 1283: <li><a href="errata25.html#chflags">Jul 30, 1999: Do not permit regular
1.95 deraadt 1284: users to chflags(2) or fchflags(2) on character or block devices
1285: which they may currently be the owner of (patch included).</a>
1.294 david 1286: <li><a href="errata25.html#nroff">Jul 27, 1999: Cause groff(1) to be invoked
1.95 deraadt 1287: with the -S flag, when called by nroff(1) (patch included).</a>
1.93 deraadt 1288: </ul>
1289:
1.106 deraadt 1290: <p>
1291: <li>
1.288 matthieu 1292: <a name="24"></a>
1.235 miod 1293:
1.294 david 1294: <h3><font color="#e00000">OpenBSD 2.4 Security Advisories</font></h3>
1.75 deraadt 1295: These are the OpenBSD 2.4 advisories -- all these problems are solved
1.294 david 1296: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.75 deraadt 1297: OpenBSD 2.3 advisories listed below are fixed in OpenBSD 2.4.
1298:
1.96 deraadt 1299: <p>
1.75 deraadt 1300: <ul>
1.294 david 1301: <li><a href="errata24.html#poll">Mar 22, 1999: The nfds argument for poll(2) needs
1.91 deraadt 1302: to be constrained, to avoid kvm starvation (patch included).</a>
1.294 david 1303: <li><a href="errata24.html#tss">Mar 21, 1999: A change in TSS handling stops
1.91 deraadt 1304: another kernel crash case caused by the <strong>crashme</strong>
1305: program (patch included).</a>
1.294 david 1306: <li><a href="errata24.html#nlink">Feb 25, 1999: An unbounded increment on the
1.90 deraadt 1307: nlink value in FFS and EXT2FS filesystems can cause a system crash.
1.89 deraadt 1308: (patch included).</a>
1.294 david 1309: <li><a href="errata24.html#ping">Feb 23, 1999: Yet another buffer overflow
1.88 deraadt 1310: existed in ping(8). (patch included).</a>
1.294 david 1311: <li><a href="errata24.html#ipqrace">Feb 19, 1999: ipintr() had a race in use of
1.87 deraadt 1312: the ipq, which could permit an attacker to cause a crash.
1313: (patch included).</a>
1.294 david 1314: <li><a href="errata24.html#accept">Feb 17, 1999: A race condition in the
1.86 deraadt 1315: kernel between accept(2) and select(2) could permit an attacker
1316: to hang sockets from remote.
1317: (patch included).</a>
1.294 david 1318: <li><a href="errata24.html#maxqueue">Feb 17, 1999: IP fragment assembly can
1.85 deraadt 1319: bog the machine excessively and cause problems.
1320: (patch included).</a>
1.294 david 1321: <li><a href="errata24.html#trctrap">Feb 12, 1999: i386 T_TRCTRAP handling and
1.84 deraadt 1322: DDB interacted to possibly cause a crash.
1323: (patch included).</a>
1.294 david 1324: <li><a href="errata24.html#rst">Feb 11, 1999: TCP/IP RST handling was sloppy.
1.83 deraadt 1325: (patch included).</a>
1.294 david 1326: <li><a href="errata24.html#bootpd">Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 1327: problem in bootpd(8). (patch included).</a>
1.294 david 1328: <li><a href="errata24.html#termcap">Nov 19, 1998: There is a possibly locally
1.82 deraadt 1329: exploitable problem relating to environment variables in termcap
1330: and curses. (patch included).</a>
1.294 david 1331: <li><a href="errata24.html#tcpfix">Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 1332: bug in the TCP decoding kernel. (patch included).</a>
1.75 deraadt 1333: </ul>
1334:
1.106 deraadt 1335: <p>
1336: <li>
1.288 matthieu 1337: <a name="23"></a>
1.235 miod 1338:
1.294 david 1339: <h3><font color="#e00000">OpenBSD 2.3 Security Advisories</font></h3>
1.73 deraadt 1340: These are the OpenBSD 2.3 advisories -- all these problems are solved
1.294 david 1341: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.73 deraadt 1342: OpenBSD 2.2 advisories listed below are fixed in OpenBSD 2.3.
1.53 matthieu 1343:
1.96 deraadt 1344: <p>
1.53 matthieu 1345: <ul>
1.294 david 1346: <li><a href="errata23.html#bootpd">Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 1347: problem in bootpd(8). (patch included).</a>
1.294 david 1348: <li><a href="errata23.html#tcpfix">Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 1349: bug in the TCP decoding kernel. (patch included).</a>
1.294 david 1350: <li><a href="errata23.html#resolver">August 31, 1998: A benign looking resolver
1.190 mpech 1351: buffer overflow bug was re-introduced accidentally (patches included).</a>
1.294 david 1352: <li><a href="errata23.html#chpass">Aug 2, 1998:
1.190 mpech 1353: chpass(1) has a file descriptor leak which allows an
1354: attacker to modify /etc/master.passwd.</a>
1.294 david 1355: <li><a href="errata23.html#inetd">July 15, 1998: Inetd had a file descriptor leak.</a>
1356: <li><a href="errata23.html#fdalloc">Jul 2, 1998: setuid and setgid processes
1.72 deraadt 1357: should not be executed with fd slots 0, 1, or 2 free.
1358: (patch included).</a>
1.294 david 1359: <li><a href="errata23.html#xlib">June 6, 1998: Further problems with the X
1.71 deraadt 1360: libraries (patches included).</a>
1.294 david 1361: <li><a href="errata23.html#kill">May 17, 1998: kill(2) of setuid/setgid target
1.66 deraadt 1362: processes too permissive (4th revision patch included).</a>
1.294 david 1363: <li><a href="errata23.html#immutable">May 11, 1998: mmap() permits partial bypassing
1.60 deraadt 1364: of immutable and append-only file flags. (patch included).</a>
1.294 david 1365: <li><a href="errata23.html#ipsec">May 5, 1998: Incorrect handling of IPSEC packets
1.190 mpech 1366: if IPSEC is enabled (patch included).</a>
1.294 david 1367: <li><a href="errata23.html#xterm-xaw">May 1, 1998: Buffer overflow in xterm and Xaw
1.58 deraadt 1368: (CERT advisory VB-98.04) (patch included).</a>
1.53 matthieu 1369: </ul>
1.9 deraadt 1370:
1.106 deraadt 1371: <p>
1372: <li>
1.288 matthieu 1373: <a name="22"></a>
1.235 miod 1374:
1.294 david 1375: <h3><font color="#e00000">OpenBSD 2.2 Security Advisories</font></h3>
1.45 deraadt 1376: These are the OpenBSD 2.2 advisories. All these problems are solved
1.294 david 1377: in <a href="23.html">OpenBSD 2.3</a>. Some of these problems
1.45 deraadt 1378: still exist in other operating systems. (The supplied patches are for
1379: OpenBSD 2.2; they may or may not work on OpenBSD 2.1).
1.9 deraadt 1380:
1.96 deraadt 1381: <p>
1.9 deraadt 1382: <ul>
1.294 david 1383: <li><a href="errata22.html#ipsec">May 5, 1998: Incorrect handling of IPSEC
1.72 deraadt 1384: packets if IPSEC is enabled (patch included).</a>
1.294 david 1385: <li><a href="errata22.html#xterm-xaw">May 1, 1998: Buffer overflow in xterm
1.72 deraadt 1386: and Xaw (CERT advisory VB-98.04) (patch included).</a>
1.294 david 1387: <li><a href="errata22.html#uucpd">Apr 22, 1998: Buffer overflow in uucpd
1.72 deraadt 1388: (patch included).</a>
1.294 david 1389: <li><a href="errata22.html#rmjob">Apr 22, 1998: Buffer mismanagement in lprm
1.72 deraadt 1390: (patch included).</a>
1.294 david 1391: <li><a href="errata22.html#ping">Mar 31, 1998: Overflow in ping -R (patch included).</a>
1392: <li><a href="errata22.html#named">Mar 30, 1998: Overflow in named fake-iquery
1.59 deraadt 1393: (patch included).</a>
1.294 david 1394: <li><a href="errata22.html#mountd">Mar 2, 1998: Accidental NFS filesystem
1.72 deraadt 1395: export (patch included).</a>
1.112 philen 1396: <li><a href="advisories/mmap.txt">Feb 26, 1998: Read-write mmap() flaw.</a>
1.294 david 1397: Revision 3 of the patch is available <a href="errata22.html#mmap">here</a>
1.112 philen 1398: <li><a href="advisories/sourceroute.txt">Feb 19, 1998: Sourcerouted Packet
1.59 deraadt 1399: Acceptance.</a>
1.294 david 1400: A patch is available <a href="errata22.html#sourceroute">here</a>.
1401: <li><a href="errata22.html#ruserok">Feb 13, 1998: Setuid coredump & Ruserok()
1.72 deraadt 1402: flaw (patch included).</a>
1.294 david 1403: <li><a href="errata22.html#ldso">Feb 9, 1998: MIPS ld.so flaw (patch included).</a>
1.1 deraadt 1404: </ul>
1405:
1.106 deraadt 1406: <p>
1407: <li>
1.288 matthieu 1408: <a name="21"></a>
1.235 miod 1409:
1.294 david 1410: <h3><font color="#e00000">OpenBSD 2.1 Security Advisories</font></h3>
1.52 deraadt 1411: These are the OpenBSD 2.1 advisories. All these problems are solved
1.294 david 1412: in <a href="22.html">OpenBSD 2.2</a>. Some of these problems still
1.52 deraadt 1413: exist in other operating systems. (If you are running OpenBSD 2.1, we
1414: would strongly recommend an upgrade to the newest release, as this
1415: patch list only attempts at fixing the most important security
1416: problems. In particular, OpenBSD 2.2 fixes numerous localhost
1417: security problems. Many of those problems were solved in ways which
1418: make it hard for us to provide patches).
1419:
1.96 deraadt 1420: <p>
1.52 deraadt 1421: <ul>
1.112 philen 1422: <li><a href="advisories/signals.txt">Sep 15, 1997: Deviant Signals (patch included)</a>
1423: <li><a href="advisories/rfork.txt">Aug 2, 1997: Rfork() system call flaw
1.59 deraadt 1424: (patch included)</a>
1.112 philen 1425: <li><a href="advisories/procfs.txt">Jun 24, 1997: Procfs flaws (patch included)</a>
1.52 deraadt 1426: </ul>
1.51 deraadt 1427:
1.106 deraadt 1428: <p>
1429: <li>
1.288 matthieu 1430: <a name="20"></a>
1.235 miod 1431:
1.294 david 1432: <h3><font color="#e00000">OpenBSD 2.0 Security Advisories</font></h3>
1.99 deraadt 1433: These are the OpenBSD 2.0 advisories. All these problems are solved
1.294 david 1434: in <a href="21.html">OpenBSD 2.1</a>. Some of these problems still
1.99 deraadt 1435: exist in other operating systems. (If you are running OpenBSD 2.0, we
1436: commend you for being there back in the old days!, but you're really
1437: missing out if you don't install a new version!)
1438:
1439: <p>
1440: <ul>
1.112 philen 1441: <li><a href="advisories/res_random.txt">April 22, 1997: Predictable IDs in the
1.99 deraadt 1442: resolver (patch included)</a>
1443: <li>Many others... if people can hunt them down, please let me know
1444: and we'll put them up here.
1445: </ul>
1.51 deraadt 1446: <p>
1.106 deraadt 1447:
1.288 matthieu 1448: <a name="watching"></a>
1.294 david 1449: <li><h3><font color="#e00000">Watching our Changes</font></h3><p>
1.106 deraadt 1450:
1.21 deraadt 1451: Since we take a proactive stance with security, we are continually
1452: finding and fixing new security problems. Not all of these problems
1.80 espie 1453: get widely reported because (as stated earlier) many of them are not
1.45 deraadt 1454: confirmed to be exploitable; many simple bugs we fix do turn out to
1455: have security consequences we could not predict. We do not have the
1456: time resources to make these changes available in the above format.<p>
1.21 deraadt 1457:
1458: Thus there are usually minor security fixes in the current source code
1459: beyond the previous major OpenBSD release. We make a limited
1.45 deraadt 1460: guarantee that these problems are of minimal impact and unproven
1.44 ian 1461: exploitability. If we discover that a problem definitely matters for
1.45 deraadt 1462: security, patches will show up here <strong>VERY</strong> quickly.<p>
1.21 deraadt 1463:
1.45 deraadt 1464: People who are really concerned with security can do a number of
1465: things:<p>
1.21 deraadt 1466:
1467: <ul>
1468: <li>If you understand security issues, watch our
1.294 david 1469: <a href="mail.html">source-changes mailing list</a> and keep an
1.23 deraadt 1470: eye out for things which appear security related. Since
1.21 deraadt 1471: exploitability is not proven for many of the fixes we make,
1472: do not expect the relevant commit message to say "SECURITY FIX!".
1473: If a problem is proven and serious, a patch will be available
1474: here very shortly after.
1.161 horacio 1475: <li>In addition to source changes, you can watch our <a href="mail.html">
1.160 ericj 1476: security-announce mailing list</a> which will notify you for every
1.186 ian 1477: security related item that the OpenBSD team deems as a possible threat,
1.160 ericj 1478: and instruct you on how to patch the problem.
1.21 deraadt 1479: <li>Track our current source code tree, and teach yourself how to do a
1.29 deraadt 1480: complete system build from time to time (read /usr/src/Makefile
1481: carefully). Users can make the assumption that the current
1482: source tree always has stronger security than the previous release.
1.45 deraadt 1483: However, building your own system from source code is not trivial;
1.265 miod 1484: it is nearly 600MB of source code, and problems do occur as we
1.45 deraadt 1485: transition between major releases.
1.115 ericj 1486: <li>Install a binary snapshot for your
1.80 espie 1487: architecture, which are made available fairly often. For
1.29 deraadt 1488: instance, an i386 snapshot is typically made available weekly.
1.21 deraadt 1489: </ul>
1490:
1.9 deraadt 1491: <p>
1.288 matthieu 1492: <a name="reporting"></a>
1.294 david 1493: <li><h3><font color="#e00000">Reporting problems</font></h3><p>
1.3 deraadt 1494:
1.5 deraadt 1495: <p> If you find a new security problem, you can mail it to
1.294 david 1496: <a href="mailto:deraadt@openbsd.org">deraadt@openbsd.org</a>.
1.7 deraadt 1497: <br>
1.5 deraadt 1498: If you wish to PGP encode it (but please only do so if privacy is very
1.112 philen 1499: urgent, since it is inconvenient) use this <a href="advisories/pgpkey.txt">pgp key</a>.
1.5 deraadt 1500:
1.107 deraadt 1501: <p>
1.288 matthieu 1502: <a name="papers"></a>
1.294 david 1503: <li><h3><font color="#e00000">Further Reading</font></h3><p>
1.107 deraadt 1504:
1505: A number of papers have been written by OpenBSD team members, about security
1506: related changes they have done in OpenBSD. The postscript versions of these
1.108 deraadt 1507: documents are available as follows.<p>
1.107 deraadt 1508:
1509: <ul>
1.113 deraadt 1510: <li>A Future-Adaptable Password Scheme.<br>
1.294 david 1511: <a href="events.html#usenix99">Usenix 1999</a>,
1512: by <a href="mailto:provos@openbsd.org">Niels Provos</a>,
1513: <a href="mailto:dm@openbsd.org">David Mazieres</a>.<br>
1514: <a href="papers/bcrypt-paper.ps">paper</a> and
1515: <a href="papers/bcrypt-slides.ps">slides</a>.
1.113 deraadt 1516: <p>
1517: <li>Cryptography in OpenBSD: An Overview.<br>
1.294 david 1518: <a href="events.html#usenix99">Usenix 1999</a>,
1519: by <a href="mailto:deraadt@openbsd.org">Theo de Raadt</a>,
1520: <a href="mailto:niklas@openbsd.org">Niklas Hallqvist</a>,
1521: <a href="mailto:art@openbsd.org">Artur Grabowski</a>,
1522: <a href="mailto:angelos@openbsd.org">Angelos D. Keromytis</a>,
1523: <a href="mailto:provos@openbsd.org">Niels Provos</a>.<br>
1524: <a href="papers/crypt-paper.ps">paper</a> and
1525: <a href="papers/crypt-slides.ps">slides</a>.
1.113 deraadt 1526: <p>
1527: <li>strlcpy and strlcat -- consistent, safe, string copy and concatenation.<br>
1.294 david 1528: <a href="events.html#usenix99">Usenix 1999</a>,
1529: by <a href="mailto:millert@openbsd.org">Todd C. Miller</a>,
1530: <a href="mailto:deraadt@openbsd.org">Theo de Raadt</a>.<br>
1531: <a href="papers/strlcpy-paper.ps">paper</a> and
1532: <a href="papers/strlcpy-slides.ps">slides</a>.
1.113 deraadt 1533: <p>
1.118 deraadt 1534: <li>Dealing with Public Ethernet Jacks-Switches, Gateways, and Authentication.<br>
1.294 david 1535: <a href="events.html#lisa99">LISA 1999</a>,
1536: by <a href="mailto:beck@openbsd.org">Bob Beck</a>.<br>
1537: <a href="papers/authgw-paper.ps">paper</a> and
1538: <a href="papers/authgw-slides.ps">slides</a>.
1.118 deraadt 1539: <p>
1.153 jufi 1540: <li>Encrypting Virtual Memory<br>
1.294 david 1541: <a href="events.html#sec2000">Usenix Security 2000</a>,
1542: <a href="mailto:provos@openbsd.org">Niels Provos</a>.<br>
1543: <a href="papers/swapencrypt.ps">paper</a> and
1544: <a href="papers/swapencrypt-slides.ps">slides</a>.
1.142 deraadt 1545: <p>
1.107 deraadt 1546: </ul>
1.294 david 1547: </ul>
1.106 deraadt 1548:
1.2 deraadt 1549: <hr>
1.294 david 1550: <a href="index.html"><img height=24 width=24 src="back.gif" border=0 alt="OpenBSD"></a>
1551: <a href="mailto:www@openbsd.org">www@openbsd.org</a>
1.24 deraadt 1552: <br>
1.342 ! mbalmer 1553: <small>$OpenBSD: security.html,v 1.341 2007/03/16 17:37:01 reyk Exp $</small>
1.1 deraadt 1554:
1.24 deraadt 1555: </body>
1556: </html>
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