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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>
1.340 deraadt 237: <li><a href="errata40.html#m_dup1">Mar 7, 2007:
238: Incorrect mbuf handling for ICMP6 packets.</a>
1.339 deraadt 239: <li><a href="errata40.html#agp">Jan 3, 2007:
1.338 miod 240: Insufficient validation in vga(4) may allow an attacker to gain
241: root privileges on some i386 systems.</a>
1.339 deraadt 242: <li><a href="errata40.html#ldso">Nov 19, 2006:
1.337 deraadt 243: ld.so(1) fails to properly sanitize the environment.</a>
1.339 deraadt 244: <li><a href="errata40.html#systrace">Nov 4, 2006:
1.334 brad 245: Fix for an integer overflow in systrace(4)'s STRIOCREPLACE support,
246: found by Chris Evans.</a>
1.339 deraadt 247: <li><a href="errata40.html#openssl">Nov 4, 2006:
1.334 brad 248: Several problems have been found in OpenSSL.</a>
1.339 deraadt 249: <li><a href="errata40.html#httpd">Nov 4, 2006:
1.334 brad 250: httpd(8) does not sanitize the Expect header from an HTTP request
251: when it is reflected back in an error message, which might allow
252: cross-site scripting (XSS) style attacks.</a>
253: </ul>
254:
255: <li>
1.321 brad 256: <a name="39"></a>
257:
258: <h3><font color="#e00000">OpenBSD 3.9 Security Advisories</font></h3>
259: These are the OpenBSD 3.9 advisories -- all these problems are solved
260: in <a href=anoncvs.html>OpenBSD current</a> and the
261: <a href=stable.html>patch branch</a>.
262:
263: <p>
264: <ul>
1.340 deraadt 265: <li><a href="errata39.html#m_dup1">Mar 7, 2007:
266: Incorrect mbuf handling for ICMP6 packets.</a>
1.338 miod 267: <li><a href="errata39.html#agp">Jan 3, 2007:
268: Insufficient validation in vga(4) may allow an attacker to gain
269: root privileges on some i386 systems.</a>
1.336 brad 270: <li><a href="errata39.html#ldso">Nov 19, 2006:
1.337 deraadt 271: ld.so(1) fails to properly sanitize the environment.</a>
1.333 deraadt 272: <li><a href="errata39.html#ssh">Oct 12, 2006:
1.332 brad 273: Fix 2 security bugs found in OpenSSH.</a>
1.333 deraadt 274: <li><a href="errata39.html#systrace">Oct 7, 2006:
1.331 brad 275: Fix for an integer overflow in systrace(4)'s STRIOCREPLACE support,
1.330 brad 276: found by Chris Evans.</a>
1.333 deraadt 277: <li><a href="errata39.html#openssl2">Oct 7, 2006:
1.330 brad 278: Several problems have been found in OpenSSL.</a>
1.333 deraadt 279: <li><a href="errata39.html#httpd2">Oct 7, 2006:
1.330 brad 280: httpd(8) does not sanitize the Expect header from an HTTP request
281: when it is reflected back in an error message, which might allow
282: cross-site scripting (XSS) style attacks.</a>
1.333 deraadt 283: <li><a href="errata39.html#openssl">Sep 8, 2006:
1.329 brad 284: Due to incorrect PKCS#1 v1.5 padding validation in OpenSSL, it is
285: possible for an attacker to construct an invalid signature which
286: OpenSSL would accept as a valid PKCS#1 v1.5 signature.</a>
1.333 deraadt 287: <li><a href="errata39.html#bind">Sep 8, 2006:
1.328 brad 288: Two Denial of Service issues have been found with BIND.</a>
1.333 deraadt 289: <li><a href="errata39.html#sppp">Sep 2, 2006:
1.327 brad 290: Due to the failure to correctly validate LCP configuration option
291: lengths, it is possible for an attacker to send LCP packets via an
292: sppp(4) connection causing the kernel to panic.</a>
1.333 deraadt 293: <li><a href="errata39.html#isakmpd">Aug 25, 2006:
1.326 brad 294: A problem in isakmpd(8) caused IPsec to run partly without replay
295: protection.</a>
1.333 deraadt 296: <li><a href="errata39.html#sem">Aug 25, 2006:
1.326 brad 297: It is possible to cause the kernel to panic when more than the default
298: number of sempahores have been allocated.</a>
1.333 deraadt 299: <li><a href="errata39.html#dhcpd">Aug 25, 2006:
1.326 brad 300: Due to an off-by-one error in dhcpd(8) it is possible to cause dhcpd(8)
301: to exit by sending a DHCPDISCOVER packet with a 32-byte client identifier
302: option.</a>
1.333 deraadt 303: <li><a href="errata39.html#sendmail3">Aug 25, 2006:
1.326 brad 304: A potential denial of service problem has been found in sendmail.</a>
1.333 deraadt 305: <li><a href="errata39.html#httpd">Jul 30, 2006:
1.325 brad 306: httpd(8)'s mod_rewrite has a potentially exploitable off-by-one buffer
307: overflow.</a>
1.333 deraadt 308: <li><a href="errata39.html#sendmail2">Jun 15, 2006:
1.324 brad 309: A potential denial of service problem has been found in sendmail.</a>
1.333 deraadt 310: <li><a href="errata39.html#xorg">May 2, 2006:
1.322 brad 311: A buffer overflow exists in the Render extension of the X server.</a>
1.333 deraadt 312: <li><a href="errata39.html#sendmail">Mar 25, 2006:
1.321 brad 313: A race condition has been reported to exist in the handling by sendmail
314: of asynchronous signals.</a>
315: </ul>
316:
1.338 miod 317: <p>
318: OpenBSD 3.8 and earlier releases are not supported anymore. The following
319: paragraphs only list advisories issued while they were maintained; these
320: releases are likely to be affected by the advisories for more recent releases.
321: <br>
322:
1.321 brad 323: <li>
1.318 deraadt 324: <a name="38"></a>
325:
326: <h3><font color="#e00000">OpenBSD 3.8 Security Advisories</font></h3>
327: These are the OpenBSD 3.8 advisories -- all these problems are solved
328: in <a href=anoncvs.html>OpenBSD current</a> and the
329: <a href=stable.html>patch branch</a>.
330:
331: <p>
332: <ul>
1.332 brad 333: <li><a href="errata38.html#ssh2">Oct 12, 2006:
334: Fix 2 security bugs found in OpenSSH.</a>
1.330 brad 335: <li><a href="errata38.html#systrace">Oct 7, 2006:
1.331 brad 336: Fix for an integer overflow in systrace(4)'s STRIOCREPLACE support,
1.330 brad 337: found by Chris Evans.</a>
338: <li><a href="errata38.html#openssl2">Oct 7, 2006:
339: Several problems have been found in OpenSSL.</a>
340: <li><a href="errata38.html#httpd2">Oct 7, 2006:
341: httpd(8) does not sanitize the Expect header from an HTTP request
342: when it is reflected back in an error message, which might allow
343: cross-site scripting (XSS) style attacks.</a>
1.329 brad 344: <li><a href="errata38.html#openssl">Sep 8, 2006:
345: Due to incorrect PKCS#1 v1.5 padding validation in OpenSSL, it is
346: possible for an attacker to construct an invalid signature which
347: OpenSSL would accept as a valid PKCS#1 v1.5 signature.</a>
1.328 brad 348: <li><a href="errata38.html#bind">Sep 8, 2006:
349: Two Denial of Service issues have been found with BIND.</a>
1.327 brad 350: <li><a href="errata38.html#sppp">Sep 2, 2006:
351: Due to the failure to correctly validate LCP configuration option
352: lengths, it is possible for an attacker to send LCP packets via an
353: sppp(4) connection causing the kernel to panic.</a>
1.326 brad 354: <li><a href="errata38.html#isakmpd">Aug 25, 2006:
355: A problem in isakmpd(8) caused IPsec to run partly without replay
356: protection.</a>
357: <li><a href="errata38.html#sem">Aug 25, 2006:
358: It is possible to cause the kernel to panic when more than the default
359: number of sempahores have been allocated.</a>
360: <li><a href="errata38.html#dhcpd">Aug 25, 2006:
361: Due to an off-by-one error in dhcpd(8) it is possible to cause dhcpd(8)
362: to exit by sending a DHCPDISCOVER packet with a 32-byte client identifier
363: option.</a>
364: <li><a href="errata38.html#sendmail3">Aug 25, 2006:
365: A potential denial of service problem has been found in sendmail.</a>
1.325 brad 366: <li><a href="errata38.html#httpd">Jul 30, 2006:
367: httpd(8)'s mod_rewrite has a potentially exploitable off-by-one buffer
368: overflow.</a>
1.324 brad 369: <li><a href="errata38.html#sendmail2">Jun 15, 2006:
370: A potential denial of service problem has been found in sendmail.</a>
1.322 brad 371: <li><a href="errata38.html#xorg">May 2, 2006:
372: A buffer overflow exists in the Render extension of the X server.</a>
1.321 brad 373: <li><a href="errata38.html#sendmail">Mar 25, 2006:
374: A race condition has been reported to exist in the handling by sendmail
375: of asynchronous signals.</a>
376: <li><a href="errata38.html#ssh">Feb 12, 2006:
1.320 brad 377: Josh Bressers has reported a weakness in OpenSSH caused due to the
378: insecure use of the system(3) function in scp(1) when performing copy
379: operations using filenames that are supplied by the user from the
380: command line.</a>
1.321 brad 381: <li><a href="errata38.html#fd">Jan 5, 2006:
1.319 brad 382: Do not allow users to trick suid programs into re-opening files via
383: /dev/fd.</a>
1.321 brad 384: <li><a href="errata38.html#perl">Jan 5, 2006:
1.319 brad 385: A buffer overflow has been found in the Perl interpreter with the
386: sprintf function which may be exploitable under certain conditions.</a>
1.318 deraadt 387: </ul>
388:
389: <li>
1.312 david 390: <a name="37"></a>
391:
392: <h3><font color="#e00000">OpenBSD 3.7 Security Advisories</font></h3>
393: These are the OpenBSD 3.7 advisories -- all these problems are solved
1.323 steven 394: in <a href="anoncvs.html">OpenBSD current</a>. The
395: <a href="stable.html">patch branch</a> for 3.7 is no longer being maintained,
396: you should update your machine.
1.312 david 397:
398: <p>
399: <ul>
1.322 brad 400: <li><a href="errata37.html#xorg">May 2, 2006:
401: A buffer overflow exists in the Render extension of the X server.</a>
1.321 brad 402: <li><a href="errata37.html#sendmail">Mar 25, 2006:
403: A race condition has been reported to exist in the handling by sendmail
404: of asynchronous signals.</a>
1.320 brad 405: <li><a href="errata37.html#ssh">Feb 12, 2006:
406: Josh Bressers has reported a weakness in OpenSSH caused due to the
407: insecure use of the system(3) function in scp(1) when performing copy
408: operations using filenames that are supplied by the user from the
409: command line.</a>
1.319 brad 410: <li><a href="errata37.html#fd">Jan 5, 2006:
411: Do not allow users to trick suid programs into re-opening files via
412: /dev/fd.</a>
413: <li><a href="errata37.html#perl">Jan 5, 2006:
414: A buffer overflow has been found in the Perl interpreter with the
415: sprintf function which may be exploitable under certain conditions.</a>
1.318 deraadt 416: <li><a href="errata37.html#libz2">Jul 21, 2005:
1.317 millert 417: Fix another buffer overflow in the zlib library that may be exploitable.</a>
1.318 deraadt 418: <li><a href="errata37.html#libz">Jul 6, 2005:
1.316 millert 419: Fix a buffer overflow in the zlib library that may be exploitable.</a>
1.318 deraadt 420: <li><a href="errata37.html#sudo">Jun 20, 2005:
1.316 millert 421: Fix a race condition in sudo(8) that could allow a user
1.315 millert 422: to run arbitrary commands.</a>
1.318 deraadt 423: <li><a href="errata37.html#cvs">Jun 7, 2005:
1.313 brad 424: Fix a buffer overflow, memory leaks, and NULL pointer
425: dereference in cvs(1).</a>
1.312 david 426: </ul>
427:
428: <li>
1.301 miod 429: <a name="36"></a>
430:
431: <h3><font color="#e00000">OpenBSD 3.6 Security Advisories</font></h3>
432: These are the OpenBSD 3.6 advisories -- all these problems are solved
1.323 steven 433: in <a href="anoncvs.html">OpenBSD current</a>. The
434: <a href="stable.html">patch branch</a> for 3.6 is no longer being maintained,
435: you should update your machine.
1.301 miod 436:
437: <p>
1.302 markus 438: <ul>
1.317 millert 439: <li><a href="errata36.html#libz2">Jul 21, 2005:
440: Fix another buffer overflow in the zlib library that may be exploitable.</a>
1.316 millert 441: <li><a href="errata36.html#libz">Jul 6, 2005:
442: Fix a buffer overflow in the zlib library that may be exploitable.</a>
1.315 millert 443: <li><a href="errata36.html#sudo">Jun 20, 2005:
1.316 millert 444: Fix a race condition in sudo(8) that could allow a user
1.315 millert 445: to run arbitrary commands.</a>
1.311 deraadt 446: <li><a href="errata36.html#cvs">Apr 28, 2005:
1.310 brad 447: Fix a buffer overflow, memory leaks, and NULL pointer
448: dereference in cvs(1).</a>
1.311 deraadt 449: <li><a href="errata36.html#telnet">Mar 30, 2005:
1.309 brad 450: Due to buffer overflows in telnet(1), a malicious
451: server or man-in-the-middle attack could allow
452: execution of arbitrary code with the privileges of
453: the user invoking telnet(1).</a>
1.311 deraadt 454: <li><a href="errata36.html#copy">Mar 16, 2005:
1.307 brad 455: More stringent checking should be done in the copy(9)
456: functions to prevent their misuse.</a>
1.311 deraadt 457: <li><a href="errata36.html#locore">Feb 28, 2005:
1.306 brad 458: More stringent checking should be done in the copy(9)
459: functions to prevent their misuse.</a>
1.311 deraadt 460: <li><a href="errata36.html#httpd">Jan 12, 2005:
1.304 brad 461: httpd(8)'s mod_include module fails to properly validate
462: the length of user supplied tag strings prior to copying
1.305 brad 463: them to a local buffer, causing a buffer overflow.</a>
1.311 deraadt 464: <li><a href="errata36.html#pfkey">Dec 14, 2004:
1.302 markus 465: On systems running isakmpd(8) it is possible for a local
466: user to cause kernel memory corruption and system panic by
1.303 markus 467: setting ipsec(4) credentials on a socket.</a>
1.302 markus 468: </ul>
1.301 miod 469:
470: <li>
1.288 matthieu 471: <a name="35"></a>
1.279 deraadt 472:
1.294 david 473: <h3><font color="#e00000">OpenBSD 3.5 Security Advisories</font></h3>
1.279 deraadt 474: These are the OpenBSD 3.5 advisories -- all these problems are solved
1.314 miod 475: in <a href="anoncvs.html">OpenBSD current</a>. The
476: <a href="stable.html">patch branch</a> for 3.5 is no longer being maintained,
477: you should update your machine.
1.279 deraadt 478:
479: <p>
480: <ul>
1.310 brad 481: <li><a href="errata35.html#cvs4">Apr 28, 2005:
482: Fix a buffer overflow, memory leaks, and NULL pointer
483: dereference in cvs(1).</a>
1.309 brad 484: <li><a href="errata35.html#telnet">Mar 30, 2005:
485: Due to buffer overflows in telnet(1), a malicious
486: server or man-in-the-middle attack could allow
487: execution of arbitrary code with the privileges of
488: the user invoking telnet(1).</a>
1.308 brad 489: <li><a href="errata35.html#copy">Mar 16, 2005:
1.307 brad 490: More stringent checking should be done in the copy(9)
491: functions to prevent their misuse.</a>
1.306 brad 492: <li><a href="errata35.html#locore">Feb 28, 2005:
493: More stringent checking should be done in the copy(9)
494: functions to prevent their misuse.</a>
1.304 brad 495: <li><a href="errata35.html#httpd3">Jan 12, 2005:
496: httpd(8)'s mod_include module fails to properly validate
497: the length of user supplied tag strings prior to copying
1.305 brad 498: them to a local buffer, causing a buffer overflow.</a>
1.302 markus 499: <li><a href="errata35.html#pfkey">Dec 14, 2004:
500: On systems running isakmpd(8) it is possible for a local
501: user to cause kernel memory corruption and system panic by
1.303 markus 502: setting ipsec(4) credentials on a socket.</a>
1.301 miod 503: <li><a href="errata35.html#radius">Sep 20, 2004:
1.299 millert 504: Radius-based authentication is vulnerable to spoofed replies.</a>
1.301 miod 505: <li><a href="errata35.html#xpm">Sep 16, 2004:
1.298 brad 506: The Xpm library has vulnerabilities when parsing malicious images.</a>
1.301 miod 507: <li><a href="errata35.html#httpd2"> Sep 10, 2004:
1.297 brad 508: httpd(8)'s mod_rewrite module can be made to write one zero byte in
509: an arbitrary memory position outside of a char array, causing a DoS
510: or possibly buffer overflows.</a>
1.301 miod 511: <li><a href="errata35.html#httpd"> Jun 12, 2004:
1.300 deraadt 512: Multiple vulnerabilities have been found in httpd(8) / mod_ssl.</a>
1.301 miod 513: <li><a href="errata35.html#isakmpd"> Jun 10, 2004:
1.291 hshoexer 514: isakmpd(8) still has issues with unauthorized SA deletion,
1.293 brad 515: an attacker can delete IPsec tunnels at will.</a>
1.301 miod 516: <li><a href="errata35.html#cvs3"> Jun 9, 2004:
1.290 millert 517: Multiple remote vulnerabilities have been found in the cvs(1)
518: server which can be used by CVS clients to crash or execute
1.293 brad 519: arbitrary code on the server.</a>
1.301 miod 520: <li><a href="errata35.html#kerberos"> May 30, 2004:
1.289 beck 521: kdc(8) performs inadequate checking of request fields, leading
522: to the possibility of principal impersonation from other
523: Kerberos realms if they are trusted with a cross-realm trust.</a>
1.301 miod 524: <li><a href="errata35.html#xdm"> May 26, 2004:
1.287 matthieu 525: xdm(1) ignores the requestPort resource and creates a
1.293 brad 526: listening socket regardless of the setting in xdm-config.</a>
1.301 miod 527: <li><a href="errata35.html#cvs2"> May 20, 2004:
1.286 otto 528: A buffer overflow in the cvs(1) server has been found,
529: which can be used by CVS clients to execute arbitrary code on
1.293 brad 530: the server.</a>
1.301 miod 531: <li><a href="errata35.html#procfs"> May 13, 2004:
1.282 tedu 532: Integer overflow problems were found in procfs, allowing
1.293 brad 533: reading of arbitrary kernel memory.</a>
1.301 miod 534: <li><a href="errata35.html#cvs"> May 5, 2004:
1.281 otto 535: Pathname validation problems have been found in cvs(1),
536: allowing clients and servers access to files outside the
1.293 brad 537: repository or local CVS tree.</a>
1.279 deraadt 538: </ul>
539:
540: <p>
541: <li>
1.288 matthieu 542: <a name="34"></a>
1.261 david 543:
1.294 david 544: <h3><font color="#e00000">OpenBSD 3.4 Security Advisories</font></h3>
1.261 david 545: These are the OpenBSD 3.4 advisories -- all these problems are solved
1.301 miod 546: in <a href="anoncvs.html">OpenBSD current</a>. The
547: <a href="stable.html">patch branch</a> for 3.4 is no longer being maintained,
548: you should update your machine.
1.261 david 549: <p>
550: <ul>
1.302 markus 551: <li><a href="errata34.html#pfkey">Dec 14, 2004:
552: On systems running isakmpd(8) it is possible for a local
553: user to cause kernel memory corruption and system panic by
1.303 markus 554: setting ipsec(4) credentials on a socket.</a>
1.298 brad 555: <li><a href="errata34.html#xpm">Sep 16, 2004:
556: The Xpm library has vulnerabilities when parsing malicious images.</a>
1.297 brad 557: <li><a href="errata34.html#httpd4"> Sep 10, 2004:
558: httpd(8)'s mod_rewrite module can be made to write one zero byte in
559: an arbitrary memory position outside of a char array, causing a DoS
560: or possibly buffer overflows.</a>
1.294 david 561: <li><a href="errata34.html#httpd3"> Jun 12, 2004:
1.300 deraadt 562: Multiple vulnerabilities have been found in httpd(8) / mod_ssl.</a>
1.294 david 563: <li><a href="errata34.html#isakmpd3"> Jun 10, 2004:
1.292 brad 564: isakmpd(8) still has issues with unauthorized SA deletion,
1.293 brad 565: an attacker can delete IPsec tunnels at will.</a>
1.294 david 566: <li><a href="errata34.html#cvs3"> Jun 9, 2004:
1.290 millert 567: Multiple remote vulnerabilities have been found in the cvs(1)
568: server which can be used by CVS clients to crash or execute
1.293 brad 569: arbitrary code on the server.</a>
1.294 david 570: <li><a href="errata34.html#kerberos"> May 30, 2004:
1.289 beck 571: kdc(8) performs inadequate checking of request fields, leading
572: to the possibility of principal impersonation from other
573: Kerberos realms if they are trusted with a cross-realm trust.</a>
1.294 david 574: <li><a href="errata34.html#cvs2"> May 20, 2004:
1.286 otto 575: A buffer overflow in the cvs(1) server has been found,
576: which can be used by CVS clients to execute arbitrary code on
577: the server.</a>
1.294 david 578: <li><a href="errata34.html#procfs"> May 13, 2004:
1.282 tedu 579: Integer overflow problems were found in procfs, allowing
580: reading of arbitrary kernel memory.</a>
1.294 david 581: <li><a href="errata34.html#cvs"> May 5, 2004:
1.281 otto 582: Pathname validation problems have been found in cvs(1),
583: allowing clients and servers access to files outside the
584: repository or local CVS tree.</a>
1.294 david 585: <li><a href="errata34.html#openssl"> March 17, 2004:
1.277 millert 586: A missing check for a NULL-pointer dereference may allow a
1.281 otto 587: remote attacker to crash applications using OpenSSL.</a>
1.294 david 588: <li><a href="errata34.html#isakmpd2"> March 17, 2004:
1.276 brad 589: Defects in the payload validation and processing functions of
590: isakmpd have been discovered. An attacker could send malformed
591: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.294 david 592: <li><a href="errata34.html#httpd2"> March 13, 2004:
1.275 brad 593: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
594: access module, using IP addresses without a netmask on big endian
595: 64-bit platforms causes the rules to fail to match.</a>
1.294 david 596: <li><a href="errata34.html#ip6"> February 8, 2004:
1.272 dhartmei 597: An IPv6 MTU handling problem exists that could be used by an
598: attacker to cause a denial of service attack.</a>
1.294 david 599: <li><a href="errata34.html#sysvshm"> February 5, 2004:
1.271 millert 600: A reference counting bug in shmat(2) could be used to write to
601: kernel memory under certain circumstances.</a>
1.294 david 602: <li><a href="errata34.html#isakmpd">January 13, 2004:
1.266 brad 603: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 604: by Thomas Walpuski.</a>
1.294 david 605: <li><a href="errata34.html#ibcs2">November 17, 2003:
1.264 henning 606: It may be possible for a local user to overrun the stack in
607: compat_ibcs2(8) and cause a kernel panic.</a>
1.294 david 608: <li><a href="errata34.html#asn1">November 1, 2003:
1.262 margarid 609: The use of certain ASN.1 encodings or malformed public keys may
610: allow an attacker to mount a denial of service attack against
611: applications linked with ssl(3).</a>
1.261 david 612: </ul>
613:
614: <li>
1.288 matthieu 615: <a name="33"></a>
1.246 deraadt 616:
1.294 david 617: <h3><font color="#e00000">OpenBSD 3.3 Security Advisories</font></h3>
1.246 deraadt 618: These are the OpenBSD 3.3 advisories -- all these problems are solved
1.294 david 619: in <a href="anoncvs.html">OpenBSD current</a>. The
620: <a href="stable.html">patch branch</a> for 3.3 is no longer being maintained,
1.284 otto 621: you should update your machine.
1.246 deraadt 622: <p>
623: <ul>
1.294 david 624: <li><a href="errata33.html#cvs"> May 5, 2004:
1.281 otto 625: Pathname validation problems have been found in cvs(1),
626: allowing clients and servers access to files outside the
627: repository or local CVS tree.</a>
1.294 david 628: <li><a href="errata33.html#openssl"> March 17, 2004:
1.277 millert 629: A missing check for a NULL-pointer dereference may allow a
1.281 otto 630: remote attacker to crash applications using OpenSSL.</a>
1.294 david 631: <li><a href="errata33.html#isakmpd2"> March 17, 2004:
1.276 brad 632: Defects in the payload validation and processing functions of
633: isakmpd have been discovered. An attacker could send malformed
634: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.294 david 635: <li><a href="errata33.html#httpd2"> March 13, 2004:
1.275 brad 636: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
637: access module, using IP addresses without a netmask on big endian
638: 64-bit platforms causes the rules to fail to match.</a>
1.294 david 639: <li><a href="errata33.html#ip6"> February 8, 2004:
1.275 brad 640: An IPv6 MTU handling problem exists that could be used by an
641: attacker to cause a denial of service attack.</a>
1.294 david 642: <li><a href="errata33.html#sysvshm"> February 5, 2004:
1.271 millert 643: A reference counting bug in shmat(2) could be used to write to
644: kernel memory under certain circumstances.</a>
1.294 david 645: <li><a href="errata33.html#isakmpd">January 15, 2004:
1.268 brad 646: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 647: by Thomas Walpuski.</a>
1.294 david 648: <li><a href="errata33.html#ibcs2">November 17, 2003:
1.264 henning 649: It may be possible for a local user to execute arbitrary code
650: resulting in escalation of privileges due to a stack overrun
651: in compat_ibcs2(8).</a>
1.294 david 652: <li><a href="errata33.html#asn1">October 1, 2003:
1.257 millert 653: The use of certain ASN.1 encodings or malformed public keys may
654: allow an attacker to mount a denial of service attack against
655: applications linked with ssl(3).</a>
1.294 david 656: <li><a href="errata33.html#pfnorm">September 24, 2003:
1.258 beck 657: Access of freed memory in pf(4) could be used to
1.260 margarid 658: remotely panic a machine using scrub rules.</a>
1.294 david 659: <li><a href="errata33.html#sendmail">September 17, 2003:
1.256 millert 660: A buffer overflow in the address parsing in
661: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 662: <li><a href="errata33.html#sshbuffer">September 16, 2003:
1.255 millert 663: OpenSSH versions prior to 3.7 contains a buffer management error
664: that is potentially exploitable.</a>
1.294 david 665: <li><a href="errata33.html#sysvsem">September 10, 2003:
1.254 millert 666: Root may be able to reduce the security level by taking advantage of
667: an integer overflow when the semaphore limits are made very large.</a>
1.294 david 668: <li><a href="errata33.html#semget">August 20, 2003:
1.252 millert 669: An improper bounds check in the kernel may allow a local user
670: to panic the kernel.</a>
1.294 david 671: <li><a href="errata33.html#realpath">August 4, 2003:
1.249 millert 672: An off-by-one error exists in the C library function realpath(3)
673: may allow an attacker to gain escalated privileges.</a>
1.246 deraadt 674: </ul>
675:
1.265 miod 676:
1.247 david 677: <p>
1.246 deraadt 678: <li>
1.288 matthieu 679: <a name="32"></a>
1.224 deraadt 680:
1.294 david 681: <h3><font color="#e00000">OpenBSD 3.2 Security Advisories</font></h3>
1.224 deraadt 682: These are the OpenBSD 3.2 advisories -- all these problems are solved
1.294 david 683: in <a href="anoncvs.html">OpenBSD current</a>. The
684: <a href="stable.html">patch branch</a> for 3.2 is no longer being maintained,
1.265 miod 685: you should update your machine.
1.224 deraadt 686: <p>
687: <ul>
1.294 david 688: <li><a href="errata32.html#asn1">October 1, 2003:
1.257 millert 689: The use of certain ASN.1 encodings or malformed public keys may
690: allow an attacker to mount a denial of service attack against
691: applications linked with ssl(3). This does not affect OpenSSH.</a>
1.294 david 692: <li><a href="errata32.html#pfnorm">September 24, 2003:
1.258 beck 693: Access of freed memory in pf(4) could be used to
1.260 margarid 694: remotely panic a machine using scrub rules.</a>
1.294 david 695: <li><a href="errata32.html#sendmail4">September 17, 2003:
1.256 millert 696: A buffer overflow in the address parsing in
697: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 698: <li><a href="errata32.html#sshbuffer">September 16, 2003:
1.255 millert 699: OpenSSH versions prior to 3.7 contains a buffer management error
700: that is potentially exploitable.</a>
1.294 david 701: <li><a href="errata32.html#sendmail3">August 25, 2003:
1.253 brad 702: Fix for a potential security issue in
703: sendmail(8) with respect to DNS maps.</a>
1.294 david 704: <li><a href="errata32.html#realpath">August 4, 2003:
1.249 millert 705: An off-by-one error exists in the C library function realpath(3)
706: may allow an attacker to gain escalated privileges.</a>
1.294 david 707: <li><a href="errata32.html#sendmail2">March 31, 2003:
1.244 miod 708: A buffer overflow in the address parsing in
709: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 710: <li><a href="errata32.html#kerberos">March 24, 2003:
1.242 millert 711: A cryptographic weaknesses in the Kerberos v4 protocol can be
712: exploited on Kerberos v5 as well.</a>
1.294 david 713: <li><a href="errata32.html#kpr">March 19, 2003:
1.241 jufi 714: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 715: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.294 david 716: <li><a href="errata32.html#blinding">March 18, 2003:
1.239 miod 717: Various SSL and TLS operations in OpenSSL are vulnerable to
718: timing attacks.</a>
1.294 david 719: <li><a href="errata32.html#lprm">March 5, 2003:
1.238 millert 720: A buffer overflow in lprm(1) may allow an attacker to elevate
721: privileges to user daemon.</a>.
1.294 david 722: <li><a href="errata32.html#sendmail">March 3, 2003:
1.237 miod 723: A buffer overflow in the envelope comments processing in
724: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 725: <li><a href="errata32.html#httpd">February 25, 2003:
1.236 margarid 726: httpd(8) leaks file inode numbers via ETag header as well as
727: child PIDs in multipart MIME boundary generation. This could
728: lead, for example, to NFS exploitation because it uses inode
729: numbers as part of the file handle.</a>
1.294 david 730: <li><a href="errata32.html#ssl">February 22, 2003:
1.234 margarid 731: In ssl(8) an information leak can occur via timing by performing
732: a MAC computation even if incorrect block cipher padding has
733: been found, this is a countermeasure. Also, check for negative
734: sizes, in allocation routines.</a>
1.294 david 735: <li><a href="errata32.html#cvs">January 20, 2003:
1.232 millert 736: A double free exists in cvs(1) that could lead to privilege
737: escalation for cvs configurations where the cvs command is
1.233 margarid 738: run as a privileged user.</a>
1.294 david 739: <li><a href="errata32.html#named">November 14, 2002:
1.230 millert 740: A buffer overflow exists in named(8) that could lead to a
741: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 742: <li><a href="errata32.html#pool">November 6, 2002:
1.233 margarid 743: A logic error in the pool kernel memory allocator could cause
744: memory corruption in low-memory situations, causing the system
745: to crash.</a>
1.294 david 746: <li><a href="errata32.html#smrsh">November 6, 2002:
1.229 miod 747: An attacker can bypass smrsh(8)'s restrictions and execute
748: arbitrary commands with the privileges of his own account.</a>
1.294 david 749: <li><a href="errata32.html#pfbridge">November 6, 2002:
1.233 margarid 750: Network bridges running pf with scrubbing enabled could cause
751: mbuf corruption, causing the system to crash.</a>
1.294 david 752: <li><a href="errata32.html#kadmin">October 21, 2002:
1.228 miod 753: A buffer overflow can occur in the kadmind(8) daemon, leading
754: to possible remote crash or exploit.</a>
1.224 deraadt 755: </ul>
756:
1.227 miod 757: <p>
758: <li>
1.288 matthieu 759: <a name="31"></a>
1.203 deraadt 760:
1.294 david 761: <h3><font color="#e00000">OpenBSD 3.1 Security Advisories</font></h3>
1.203 deraadt 762: These are the OpenBSD 3.1 advisories -- all these problems are solved
1.294 david 763: in <a href="anoncvs.html">OpenBSD current</a>. The
764: <a href="stable.html">patch branch</a> for 3.1 is no longer being maintained,
1.258 beck 765: you should update your machine.
1.203 deraadt 766:
767: <p>
768: <ul>
1.294 david 769: <li><a href="errata31.html#sendmail2">March 31, 2003:
1.244 miod 770: A buffer overflow in the address parsing in
771: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 772: <li><a href="errata31.html#kerberos">March 24, 2003:
1.242 millert 773: A cryptographic weaknesses in the Kerberos v4 protocol can be
774: exploited on Kerberos v5 as well.</a>
1.294 david 775: <li><a href="errata31.html#kpr">March 19, 2003:
1.241 jufi 776: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 777: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.294 david 778: <li><a href="errata31.html#blinding">March 18, 2003:
1.239 miod 779: Various SSL and TLS operations in OpenSSL are vulnerable to
780: timing attacks.</a>
1.294 david 781: <li><a href="errata31.html#lprm">March 4, 2003:
1.238 millert 782: A buffer overflow in lprm(1) may allow an attacker to gain
783: root privileges.</a>
1.294 david 784: <li><a href="errata31.html#sendmail">March 3, 2003:
1.237 miod 785: A buffer overflow in the envelope comments processing in
786: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 787: <li><a href="errata31.html#ssl2">February 23, 2003:
1.235 miod 788: In ssl(8) an information leak can occur via timing by performing
789: a MAC computation even if incorrect block cipher padding has
790: been found, this is a countermeasure. Also, check for negative
791: sizes, in allocation routines.</a>
1.294 david 792: <li><a href="errata31.html#cvs">January 20, 2003:
1.232 millert 793: A double free exists in cvs(1) that could lead to privilege
794: escalation for cvs configurations where the cvs command is
1.294 david 795: run as a privileged user</a>.
796: <li><a href="errata31.html#named">November 14, 2002:
1.230 millert 797: A buffer overflow exists in named(8) that could lead to a
798: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 799: <li><a href="errata31.html#kernresource">November 6, 2002:
1.229 miod 800: Incorrect argument checking in the getitimer(2) system call
801: may allow an attacker to crash the system.</a>
1.294 david 802: <li><a href="errata31.html#smrsh">November 6, 2002:
1.229 miod 803: An attacker can bypass smrsh(8)'s restrictions and execute
804: arbitrary commands with the privileges of his own account.</a>
1.294 david 805: <li><a href="errata31.html#kadmin">October 21, 2002:
1.226 miod 806: A buffer overflow can occur in the kadmind(8) daemon, leading
807: to possible remote crash or exploit.</a>
1.294 david 808: <li><a href="errata31.html#kerntime">October 2, 2002:
1.222 jason 809: Incorrect argument checking in the setitimer(2) system call
810: may allow an attacker to write to kernel memory.</a>
1.294 david 811: <li><a href="errata31.html#scarg">August 11, 2002:
1.221 provos 812: An insufficient boundary check in the select system call
1.220 miod 813: allows an attacker to overwrite kernel memory and execute arbitrary code
814: in kernel context.</a>
1.294 david 815: <li><a href="errata31.html#ssl">July 30, 2002:
1.218 miod 816: Several remote buffer overflows can occur in the SSL2 server and SSL3
817: client of the ssl(8) library, as in the ASN.1 parser code in the
818: crypto(3) library, all of them being potentially remotely
819: exploitable.</a>
1.294 david 820: <li><a href="errata31.html#xdr">July 29, 2002:
1.218 miod 821: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
822: possible remote crash.</a>
1.294 david 823: <li><a href="errata31.html#pppd">July 29, 2002:
1.218 miod 824: A race condition exists in the pppd(8) daemon which may cause it to
825: alter the file permissions of an arbitrary file.</a>
1.294 david 826: <li><a href="errata31.html#isakmpd">July 5, 2002:
1.218 miod 827: Receiving IKE payloads out of sequence can cause isakmpd(8) to
828: crash.</a>
1.294 david 829: <li><a href="errata31.html#ktrace">June 27, 2002:
1.215 miod 830: The kernel would let any user ktrace set[ug]id processes.</a>
1.294 david 831: <li><a href="errata31.html#modssl">June 26, 2002:
1.213 miod 832: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 833: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.294 david 834: <li><a href="errata31.html#resolver">June 25, 2002:
1.212 millert 835: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 836: <li><a href="errata31.html#sshd">June 24, 2002:
1.216 deraadt 837: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 838: input validation error that can result in an integer overflow and
839: privilege escalation.</a>
1.294 david 840: <li><a href="errata31.html#httpd">June 19, 2002:
1.211 miod 841: A buffer overflow can occur during the interpretation of chunked
842: encoding in httpd(8), leading to possible remote crash.</a>
1.294 david 843: <li><a href="errata31.html#sshbsdauth">May 22, 2002:
1.209 markus 844: Under certain conditions, on systems using YP with netgroups
845: in the password database, it is possible that sshd(8) does
846: ACL checks for the requested user name but uses the password
847: database entry of a different user for authentication. This
848: means that denied users might authenticate successfully
849: while permitted users could be locked out.</a>
1.294 david 850: <li><a href="errata31.html#fdalloc2">May 8, 2002:
1.208 millert 851: A race condition exists that could defeat the kernel's
852: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 853: <li><a href="errata31.html#sudo">April 25, 2002:
1.205 millert 854: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 855: <li><a href="errata31.html#sshafs">April 22, 2002:
1.205 millert 856: A local user can gain super-user privileges due to a buffer
857: overflow in sshd(8) if AFS has been configured on the system
858: or if KerberosTgtPassing or AFSTokenPassing has been enabled
859: in the sshd_config file.</a>
1.203 deraadt 860: </ul>
861:
1.235 miod 862: <p>
1.203 deraadt 863: <li>
1.288 matthieu 864: <a name="30"></a>
1.187 deraadt 865:
1.294 david 866: <h3><font color="#e00000">OpenBSD 3.0 Security Advisories</font></h3>
1.187 deraadt 867: These are the OpenBSD 3.0 advisories -- all these problems are solved
1.294 david 868: in <a href="anoncvs.html">OpenBSD current</a>. The
869: <a href="stable.html">patch branch</a> for 3.0 is no longer being maintained,
1.258 beck 870: you should update your machine.
1.187 deraadt 871:
872: <p>
873: <ul>
1.294 david 874: <li><a href="errata30.html#named">November 14, 2002:
1.230 millert 875: A buffer overflow exists in named(8) that could lead to a
876: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 877: <li><a href="errata30.html#kernresource">November 6, 2002:
1.229 miod 878: Incorrect argument checking in the getitimer(2) system call
879: may allow an attacker to crash the system.</a>
1.294 david 880: <li><a href="errata30.html#smrsh">November 6, 2002:
1.229 miod 881: An attacker can bypass smrsh(8)'s restrictions and execute
882: arbitrary commands with the privileges of his own account.</a>
1.294 david 883: <li><a href="errata30.html#kadmin">October 21, 2002:
1.226 miod 884: A buffer overflow can occur in the kadmind(8) daemon, leading
885: to possible remote crash or exploit.</a>
1.294 david 886: <li><a href="errata30.html#kerntime">October 7, 2002:
1.223 miod 887: Incorrect argument checking in the setitimer(2) system call
888: may allow an attacker to write to kernel memory.</a>
1.294 david 889: <li><a href="errata30.html#scarg">August 11, 2002:
1.220 miod 890: An insufficient boundary check in the select and poll system calls
891: allows an attacker to overwrite kernel memory and execute arbitrary code
892: in kernel context.</a>
1.294 david 893: <li><a href="errata30.html#ssl">July 30, 2002:
1.218 miod 894: Several remote buffer overflows can occur in the SSL2 server and SSL3
895: client of the ssl(8) library, as in the ASN.1 parser code in the
896: crypto(3) library, all of them being potentially remotely
897: exploitable.</a>
1.294 david 898: <li><a href="errata30.html#xdr">July 29, 2002:
1.218 miod 899: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
900: possible remote crash.</a>
1.294 david 901: <li><a href="errata30.html#pppd">July 29, 2002:
1.218 miod 902: A race condition exists in the pppd(8) daemon which may cause it to
903: alter the file permissions of an arbitrary file.</a>
1.294 david 904: <li><a href="errata30.html#isakmpd2">July 5, 2002:
1.218 miod 905: Receiving IKE payloads out of sequence can cause isakmpd(8) to
906: crash.</a>
1.294 david 907: <li><a href="errata30.html#ktrace">June 27, 2002:
1.215 miod 908: The kernel would let any user ktrace set[ug]id processes.</a>
1.294 david 909: <li><a href="errata30.html#resolver">June 25, 2002:
1.212 millert 910: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 911: <li><a href="errata30.html#sshdauth">June 24, 2002:
1.216 deraadt 912: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 913: input validation error that can result in an integer overflow and
914: privilege escalation.</a>
1.294 david 915: <li><a href="errata30.html#modssl">June 24, 2002:
1.213 miod 916: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 917: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.294 david 918: <li><a href="errata30.html#httpd">June 19, 2002:
1.213 miod 919: A buffer overflow can occur during the interpretation of chunked
920: encoding in httpd(8), leading to possible remote crash.</a>
1.294 david 921: <li><a href="errata30.html#fdalloc2">May 8, 2002:
1.208 millert 922: A race condition exists that could defeat the kernel's
923: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 924: <li><a href="errata30.html#sudo2">April 25, 2002:
1.205 millert 925: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 926: <li><a href="errata30.html#sshafs">April 22, 2002:
1.205 millert 927: A local user can gain super-user privileges due to a buffer
928: overflow in sshd(8) if AFS has been configured on the system
929: or if KerberosTgtPassing or AFSTokenPassing has been enabled
930: in the sshd_config file.</a>
1.294 david 931: <li><a href="errata30.html#mail">April 11, 2002:
1.202 millert 932: The mail(1) was interpreting tilde escapes even when invoked
933: in non-interactive mode. As mail(1) is called as root from cron,
934: this can lead to a local root compromise.</a>
1.294 david 935: <li><a href="errata30.html#approval">March 19, 2002:
1.201 millert 936: Under certain conditions, on systems using YP with netgroups in
937: the password database, it is possible for the rexecd(8) and rshd(8)
938: daemons to execute a shell from a password database entry for a
939: different user. Similarly, atrun(8) may change to the wrong
940: home directory when running jobs.</a>
1.294 david 941: <li><a href="errata30.html#zlib">March 13, 2002:
1.200 millert 942: A potential double free() exists in the zlib library;
943: this is not exploitable on OpenBSD.
944: The kernel also contains a copy of zlib; it is not
945: currently known if the kernel zlib is exploitable.</a>
1.294 david 946: <li><a href="errata30.html#openssh">March 8, 2002:
1.198 millert 947: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 948: may allow a local user to gain super-user privileges.</a>
1.294 david 949: <li><a href="errata30.html#ptrace">January 21, 2002:
1.192 jason 950: A race condition between the ptrace(2) and execve(2) system calls
951: allows an attacker to modify the memory contents of suid/sgid
952: processes which could lead to compromise of the super-user account.</a>
1.294 david 953: <li><a href="errata30.html#sudo">January 17, 2002:
1.191 millert 954: There is a security hole in sudo(8) that can be exploited
955: when the Postfix sendmail replacement is installed that may
956: allow an attacker on the local host to gain root privileges.</a>
1.294 david 957: <li><a href="errata30.html#lpd">November 28, 2001:
1.189 millert 958: An attacker can trick a machine running the lpd daemon into
959: creating new files in the root directory from a machine with
960: remote line printer access.</a>
1.294 david 961: <li><a href="errata30.html#vi.recover">November 13, 2001:
1.188 millert 962: The vi.recover script can be abused in such a way as
963: to cause arbitrary zero-length files to be removed.</a>
1.294 david 964: <li><a href="errata30.html#pf">November 13, 2001:
1.190 mpech 965: pf(4) was incapable of dealing with certain ipv6 icmp packets,
966: resulting in a crash.</a>
1.294 david 967: <li><a href="errata30.html#sshd">November 12, 2001:
1.190 mpech 968: A security hole that may allow an attacker to partially authenticate
969: if -- and only if -- the administrator has enabled KerberosV.</a>
1.187 deraadt 970: </ul>
971:
972: <p>
973: <li>
1.288 matthieu 974: <a name="29"></a>
1.173 deraadt 975:
1.294 david 976: <h3><font color="#e00000">OpenBSD 2.9 Security Advisories</font></h3>
1.173 deraadt 977: These are the OpenBSD 2.9 advisories -- all these problems are solved
1.294 david 978: in <a href="anoncvs.html">OpenBSD current</a>. The
979: <a href="stable.html">patch branch</a>. for 2.9 is no longer being maintained,
1.258 beck 980: you should update your machine.
981:
1.173 deraadt 982:
983: <p>
984: <ul>
1.294 david 985: <li><a href="errata29.html#resolver">June 25, 2002:
1.212 millert 986: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 987: <li><a href="errata29.html#fdalloc2">May 8, 2002:
1.208 millert 988: A race condition exists that could defeat the kernel's
989: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 990: <li><a href="errata29.html#sudo2">April 25, 2002:
1.207 millert 991: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 992: <li><a href="errata29.html#sshafs">April 22, 2002:
1.206 millert 993: A local user can gain super-user privileges due to a buffer
994: overflow in sshd(8) if AFS has been configured on the system
995: or if KerberosTgtPassing or AFSTokenPassing has been enabled
996: in the sshd_config file.</a>
1.294 david 997: <li><a href="errata29.html#mail">April 11, 2002:
1.202 millert 998: The mail(1) was interpreting tilde escapes even when invoked
999: in non-interactive mode. As mail(1) is called as root from cron,
1000: this can lead to a local root compromise.</a>
1.294 david 1001: <li><a href="errata29.html#zlib">March 13, 2002:
1.200 millert 1002: A potential double free() exists in the zlib library;
1003: this is not exploitable on OpenBSD.
1004: The kernel also contains a copy of zlib; it is not
1005: currently known if the kernel zlib is exploitable.</a>
1.294 david 1006: <li><a href="errata29.html#openssh">March 8, 2002:
1.198 millert 1007: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 1008: may allow a local user to gain super-user privileges.</a>
1.294 david 1009: <li><a href="errata29.html#ptrace">January 21, 2002:
1.198 millert 1010: A race condition between the ptrace(2) and execve(2) system calls
1011: allows an attacker to modify the memory contents of suid/sgid
1012: processes which could lead to compromise of the super-user account.</a>
1.294 david 1013: <li><a href="errata29.html#sudo">January 17, 2002:
1.191 millert 1014: There is a security hole in sudo(8) that can be exploited
1015: when the Postfix sendmail replacement is installed that may
1016: allow an attacker on the local host to gain root privileges.</a>
1.294 david 1017: <li><a href="errata29.html#lpd2">November 28, 2001:
1.189 millert 1018: An attacker can trick a machine running the lpd daemon into
1019: creating new files in the root directory from a machine with
1020: remote line printer access.</a>
1.294 david 1021: <li><a href="errata29.html#vi.recover">November 13, 2001:
1.190 mpech 1022: The vi.recover script can be abused in such a way as
1023: to cause arbitrary zero-length files to be removed.</a>
1.294 david 1024: <li><a href="errata29.html#uucp">September 11, 2001:
1.184 millert 1025: A security hole exists in uuxqt(8) that may allow an
1026: attacker to gain root privileges.</a>
1.294 david 1027: <li><a href="errata29.html#lpd">August 29, 2001:
1.183 millert 1028: A security hole exists in lpd(8) that may allow an
1029: attacker to gain root privileges if lpd is running.</a>
1.294 david 1030: <li><a href="errata29.html#sendmail2">August 21, 2001:
1.181 millert 1031: A security hole exists in sendmail(8) that may allow an
1032: attacker on the local host to gain root privileges.</a>
1.294 david 1033: <li><a href="errata29.html#nfs">July 30, 2001:
1.180 jason 1034: A kernel buffer overflow in the NFS code can be used to execute
1035: arbitrary code by users with mount privileges (only root by
1.181 millert 1036: default).</a>
1.294 david 1037: <li><a href="errata29.html#kernexec">June 15, 2001:
1.178 aaron 1038: A race condition in the kernel can lead to local root compromise.</a>
1.294 david 1039: <li><a href="errata29.html#sshcookie">June 12, 2001:
1.177 markus 1040: sshd(8) allows users to delete arbitrary files named "cookies"
1041: if X11 forwarding is enabled. X11 forwarding is disabled
1042: by default.</a>
1.294 david 1043: <li><a href="errata29.html#fts">May 30, 2001:
1.176 millert 1044: Programs using the fts routines can be tricked into changing
1045: into the wrong directory.</a>
1.294 david 1046: <li><a href="errata29.html#sendmail">May 29, 2001:
1.174 millert 1047: Sendmail signal handlers contain unsafe code,
1048: leading to numerous race conditions.</a>
1.173 deraadt 1049: </ul>
1050:
1051: <p>
1052: <li>
1.288 matthieu 1053: <a name="28"></a>
1.152 deraadt 1054:
1.294 david 1055: <h3><font color="#e00000">OpenBSD 2.8 Security Advisories</font></h3>
1.152 deraadt 1056: These are the OpenBSD 2.8 advisories -- all these problems are solved
1.294 david 1057: in <a href="anoncvs.html">OpenBSD current</a>. The
1058: <a href="stable.html">patch branch</a>. for 2.8 is no longer being maintained,
1.258 beck 1059: you should update your machine.
1060:
1.152 deraadt 1061:
1062: <p>
1063: <ul>
1.294 david 1064: <li><a href="errata28.html#uucp">September 11, 2001:
1.184 millert 1065: A security hole exists in uuxqt(8) that may allow an
1066: attacker to gain root privileges.</a>
1.294 david 1067: <li><a href="errata28.html#lpd">August 29, 2001:
1.183 millert 1068: A security hole exists in lpd(8) that may allow an
1069: attacker to gain root privileges if lpd is running.</a>
1.294 david 1070: <li><a href="errata28.html#sendmail2">August 21, 2001:
1.181 millert 1071: A security hole exists in sendmail(8) that may allow an
1072: attacker on the local host to gain root privileges.</a>
1.294 david 1073: <li><a href="errata28.html#kernexec">June 15, 2001:
1.178 aaron 1074: A race condition in the kernel can lead to local root compromise.</a>
1.294 david 1075: <li><a href="errata28.html#fts">May 30, 2001:
1.176 millert 1076: Programs using the fts routines can be tricked into changing
1077: into the wrong directory.</a>
1.294 david 1078: <li><a href="errata28.html#sendmail">May 29, 2001:
1.175 millert 1079: Sendmail signal handlers contain unsafe code,
1080: leading to numerous race conditions.</a>
1.294 david 1081: <li><a href="errata28.html#ipf_frag">Apr 23, 2001:
1.231 mickey 1082: IPF contains a serious bug with its handling of fragment caching.</a>
1.294 david 1083: <li><a href="errata28.html#glob_limit">Apr 23, 2001:
1.172 ericj 1084: ftpd(8) contains a potential DoS relating to glob(3).</a>
1.294 david 1085: <li><a href="errata28.html#glob">Apr 10, 2001:
1.170 ericj 1086: The glob(3) library call contains multiple buffer overflows.</a>
1.294 david 1087: <li><a href="errata28.html#readline">Mar 18, 2001:
1.169 millert 1088: The readline library creates history files with permissive modes based on the user's umask.</a>
1.294 david 1089: <li><a href="errata28.html#ipsec_ah">Mar 2, 2001:
1.167 ericj 1090: Insufficient checks in the IPSEC AH IPv4 option handling code can lead to a buffer overrun in the kernel.</a>
1.294 david 1091: <li><a href="errata28.html#userldt">Mar 2, 2001:
1.168 horacio 1092: The <b>USER_LDT</b> kernel option allows an attacker to gain access to privileged areas of kernel memory.</a>
1.294 david 1093: <li><a href="errata28.html#sudo">Feb 22, 2001:
1.171 millert 1094: a non-exploitable buffer overflow was fixed in sudo(8).</a>
1.294 david 1095: <li><a href="errata28.html#named">Jan 29, 2001:
1.163 jason 1096: merge named(8) with ISC BIND 4.9.8-REL, which fixes some buffer vulnerabilities.</a>
1.294 david 1097: <li><a href="errata28.html#rnd">Jan 22, 2001:
1.162 jason 1098: rnd(4) did not use all of its input when written to.</a>
1.294 david 1099: <li><a href="errata28.html#xlock">Dec 22, 2000:
1.159 ericj 1100: xlock(1)'s authentication was re-done to authenticate via a named pipe. (patch and new xlock binaries included).</a>
1.294 david 1101: <li><a href="errata28.html#procfs">Dec 18, 2000:
1.157 ericj 1102: Procfs contains numerous overflows. Procfs is not used by default in OpenBSD. (patch included).</a>
1.294 david 1103: <li><a href="errata28.html#kerberos2">Dec 10, 2000:
1.156 deraadt 1104: Another problem exists in KerberosIV libraries (patch included).</a>
1.294 david 1105: <li><a href="errata28.html#kerberos">Dec 7, 2000:
1.155 deraadt 1106: A set of problems in KerberosIV exist (patch included).</a>
1.294 david 1107: <li><a href="errata28.html#ftpd">Dec 4, 2000:
1.154 millert 1108: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.152 deraadt 1109: </ul>
1110:
1111: <p>
1112: <li>
1.288 matthieu 1113: <a name="27"></a>
1.124 deraadt 1114:
1.294 david 1115: <h3><font color="#e00000">OpenBSD 2.7 Security Advisories</font></h3>
1.124 deraadt 1116: These are the OpenBSD 2.7 advisories -- all these problems are solved
1.294 david 1117: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.124 deraadt 1118: OpenBSD 2.6 advisories listed below are fixed in OpenBSD 2.7.
1119:
1120: <p>
1121: <ul>
1.294 david 1122: <li><a href="errata27.html#readline">Mar 18, 2001:
1.169 millert 1123: The readline library creates history files with permissive modes based on the user's umask.</a>
1.294 david 1124: <li><a href="errata27.html#sudo">Feb 22, 2001:
1.169 millert 1125: a buffer overflow was fixed in sudo(8).</a>
1.294 david 1126: <li><a href="errata27.html#ftpd">Dec 4, 2000:
1.154 millert 1127: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.294 david 1128: <li><a href="errata27.html#sshforwarding">Nov 10, 2000:
1.152 deraadt 1129: Hostile servers can force OpenSSH clients to do agent or X11 forwarding.
1130: (patch included)</a>
1.294 david 1131: <li><a href="errata27.html#xtrans">Oct 26, 2000:
1.151 matthieu 1132: X11 libraries have 2 potential overflows in xtrans code.
1133: (patch included)</a>
1.294 david 1134: <li><a href="errata27.html#httpd">Oct 18, 2000:
1.150 beck 1135: Apache mod_rewrite and mod_vhost_alias modules could expose files
1136: on the server in certain configurations if used.
1137: (patch included)</a>
1.294 david 1138: <li><a href="errata27.html#telnetd">Oct 10, 2000:
1.149 millert 1139: The telnet daemon does not strip out the TERMINFO, TERMINFO_DIRS,
1140: TERMPATH and TERMCAP environment variables as it should.
1141: (patch included)</a>
1.294 david 1142: <li><a href="errata27.html#format_strings">Oct 6, 2000:
1.148 millert 1143: There are printf-style format string bugs in several privileged
1144: programs. (patch included)</a>
1.294 david 1145: <li><a href="errata27.html#curses">Oct 6, 2000:
1.147 millert 1146: libcurses honored terminal descriptions in the $HOME/.terminfo
1147: directory as well as in the TERMCAP environment variable for
1148: setuid and setgid applications.
1.146 deraadt 1149: (patch included)</a>
1.294 david 1150: <li><a href="errata27.html#talkd">Oct 6, 2000:
1.146 deraadt 1151: A format string vulnerability exists in talkd(8).
1152: (patch included)</a>
1.294 david 1153: <li><a href="errata27.html#pw_error">Oct 3, 2000:
1.145 aaron 1154: A format string vulnerability exists in the pw_error() function of the
1155: libutil library, yielding localhost root through chpass(1).
1156: (patch included)</a>
1.294 david 1157: <li><a href="errata27.html#ipsec">Sep 18, 2000:
1.144 jason 1158: Bad ESP/AH packets could cause a crash under certain conditions.
1159: (patch included)</a>
1.294 david 1160: <li><a href="errata27.html#xlock">Aug 16, 2000:
1.141 deraadt 1161: A format string vulnerability (localhost root) exists in xlock(1).
1162: (patch included)</a>
1.294 david 1163: <li><a href="errata27.html#X11_libs">July 14, 2000:
1.139 deraadt 1164: Various bugs found in X11 libraries have various side effects, almost
1165: completely denial of service in OpenBSD.
1166: (patch included)</a>
1.294 david 1167: <li><a href="errata27.html#ftpd">July 5, 2000:
1.136 deraadt 1168: Just like pretty much all the other unix ftp daemons
1169: on the planet, ftpd had a remote root hole in it.
1170: Luckily, ftpd was not enabled by default.
1.137 deraadt 1171: The problem exists if anonymous ftp is enabled.
1.136 deraadt 1172: (patch included)</a>
1.294 david 1173: <li><a href="errata27.html#mopd">July 5, 2000:
1.136 deraadt 1174: Mopd, very rarely used, contained some buffer overflows.
1175: (patch included)</a>
1.294 david 1176: <li><a href="errata27.html#libedit">June 28, 2000:
1.135 deraadt 1177: libedit would check for a <b>.editrc</b> file in the current
1178: directory. Not known to be a real security issue, but a patch
1179: is available anyways.
1180: (patch included)</a>
1.294 david 1181: <li><a href="errata27.html#dhclient">June 24, 2000:
1.134 deraadt 1182: A serious bug in dhclient(8) could allow strings from a
1183: malicious dhcp server to be executed in the shell as root.
1184: (patch included)</a>
1.294 david 1185: <li><a href="errata27.html#isakmpd">June 9, 2000:
1.133 deraadt 1186: A serious bug in isakmpd(8) policy handling wherein
1187: policy verification could be completely bypassed in isakmpd.
1188: (patch included)</a>
1.294 david 1189: <li><a href="errata27.html#uselogin">June 6, 2000:
1.132 deraadt 1190: The non-default flag UseLogin in <b>/etc/sshd_config</b> is broken,
1191: should not be used, and results in security problems on
1192: other operating systems.</a>
1.294 david 1193: <li><a href="errata27.html#bridge">May 26, 2000:
1.129 deraadt 1194: The bridge(4) <i>learning</i> flag may be bypassed.
1.128 deraadt 1195: (patch included)</a>
1.294 david 1196: <li><a href="errata27.html#ipf">May 25, 2000:
1.127 kjell 1197: Improper use of ipf <i>keep-state</i> rules can result
1198: in firewall rules being bypassed. (patch included)</a>
1199:
1.124 deraadt 1200: </ul>
1201:
1202: <p>
1203: <li>
1.288 matthieu 1204: <a name="26"></a>
1.119 deraadt 1205:
1.294 david 1206: <h3><font color="#e00000">OpenBSD 2.6 Security Advisories</font></h3>
1.119 deraadt 1207: These are the OpenBSD 2.6 advisories -- all these problems are solved
1.294 david 1208: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.119 deraadt 1209: OpenBSD 2.5 advisories listed below are fixed in OpenBSD 2.6.
1210:
1211: <p>
1212: <ul>
1.294 david 1213: <li><a href="errata26.html#semconfig">May 26, 2000:
1.130 deraadt 1214: SYSV semaphore support contained an undocumented system call
1.131 deraadt 1215: which could wedge semaphore-using processes from exiting. (patch included)</a>
1.294 david 1216: <li><a href="errata26.html#ipf">May 25, 2000:
1.127 kjell 1217: Improper use of ipf <i>keep-state</i> rules can result
1218: in firewall rules being bypassed. (patch included)</a>
1.294 david 1219: <li><a href="errata26.html#xlockmore">May 25, 2000:
1.125 deraadt 1220: xlockmore has a bug which a localhost attacker can use to gain
1221: access to the encrypted root password hash (which is normally
1.245 miod 1222: encoded using blowfish</a> (see
1.294 david 1223: <a href="http://www.openbsd.org/cgi-bin/man.cgi?query=crypt&sektion=3">
1.125 deraadt 1224: crypt(3)</a>)
1.245 miod 1225: (patch included).
1.294 david 1226: <li><a href="errata26.html#procfs">Jan 20, 2000:
1.123 deraadt 1227: Systems running with procfs enabled and mounted are
1228: vulnerable to a very tricky exploit. procfs is not
1229: mounted by default.
1230: (patch included).</a>
1.294 david 1231: <li><a href="errata26.html#sendmail">Dec 4, 1999:
1.296 david 1232: Sendmail permitted any user to cause an aliases file wrap,
1.190 mpech 1233: thus exposing the system to a race where the aliases file
1234: did not exist.
1.119 deraadt 1235: (patch included).</a>
1.294 david 1236: <li><a href="errata26.html#poll">Dec 4, 1999:
1.190 mpech 1237: Various bugs in poll(2) may cause a kernel crash.</a>
1.294 david 1238: <li><a href="errata26.html#sslUSA">Dec 2, 1999:
1.120 deraadt 1239: A buffer overflow in the RSAREF code included in the
1240: USA version of libssl, is possibly exploitable in
1241: httpd, ssh, or isakmpd, if SSL/RSA features are enabled.
1.124 deraadt 1242: (patch included).<br></a>
1243: <strong>Update:</strong> Turns out that this was not exploitable
1244: in any of the software included in OpenBSD 2.6.
1.294 david 1245: <li><a href="errata26.html#ifmedia">Nov 9, 1999:
1.190 mpech 1246: Any user could change interface media configurations, resulting in
1247: a localhost denial of service attack.
1.121 deraadt 1248: (patch included).</a>
1.119 deraadt 1249: </ul>
1250:
1251: <p>
1252: <li>
1.288 matthieu 1253: <a name="25"></a>
1.106 deraadt 1254:
1.294 david 1255: <h3><font color="#e00000">OpenBSD 2.5 Security Advisories</font></h3>
1.93 deraadt 1256: These are the OpenBSD 2.5 advisories -- all these problems are solved
1.294 david 1257: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.93 deraadt 1258: OpenBSD 2.4 advisories listed below are fixed in OpenBSD 2.5.
1259:
1.96 deraadt 1260: <p>
1.104 deraadt 1261: <ul>
1.294 david 1262: <li><a href="errata25.html#cron">Aug 30, 1999:
1.103 deraadt 1263: In cron(8), make sure argv[] is NULL terminated in the
1264: fake popen() and run sendmail as the user, not as root.
1265: (patch included).</a>
1.294 david 1266: <li><a href="errata25.html#miscfs">Aug 12, 1999: The procfs and fdescfs
1.101 deraadt 1267: filesystems had an overrun in their handling of uio_offset
1268: in their readdir() routines. (These filesystems are not
1269: enabled by default). (patch included).</a>
1.294 david 1270: <li><a href="errata25.html#profil">Aug 9, 1999: Stop profiling (see profil(2))
1.100 deraadt 1271: when we execve() a new process. (patch included).</a>
1.294 david 1272: <li><a href="errata25.html#ipsec_in_use">Aug 6, 1999: Packets that should have
1.98 deraadt 1273: been handled by IPsec may be transmitted as cleartext.
1274: PF_KEY SA expirations may leak kernel resources.
1275: (patch included).</a>
1.294 david 1276: <li><a href="errata25.html#rc">Aug 5, 1999: In /etc/rc, use mktemp(1) for
1.97 deraadt 1277: motd re-writing and change the find(1) to use -execdir
1278: (patch included).</a>
1.294 david 1279: <li><a href="errata25.html#chflags">Jul 30, 1999: Do not permit regular
1.95 deraadt 1280: users to chflags(2) or fchflags(2) on character or block devices
1281: which they may currently be the owner of (patch included).</a>
1.294 david 1282: <li><a href="errata25.html#nroff">Jul 27, 1999: Cause groff(1) to be invoked
1.95 deraadt 1283: with the -S flag, when called by nroff(1) (patch included).</a>
1.93 deraadt 1284: </ul>
1285:
1.106 deraadt 1286: <p>
1287: <li>
1.288 matthieu 1288: <a name="24"></a>
1.235 miod 1289:
1.294 david 1290: <h3><font color="#e00000">OpenBSD 2.4 Security Advisories</font></h3>
1.75 deraadt 1291: These are the OpenBSD 2.4 advisories -- all these problems are solved
1.294 david 1292: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.75 deraadt 1293: OpenBSD 2.3 advisories listed below are fixed in OpenBSD 2.4.
1294:
1.96 deraadt 1295: <p>
1.75 deraadt 1296: <ul>
1.294 david 1297: <li><a href="errata24.html#poll">Mar 22, 1999: The nfds argument for poll(2) needs
1.91 deraadt 1298: to be constrained, to avoid kvm starvation (patch included).</a>
1.294 david 1299: <li><a href="errata24.html#tss">Mar 21, 1999: A change in TSS handling stops
1.91 deraadt 1300: another kernel crash case caused by the <strong>crashme</strong>
1301: program (patch included).</a>
1.294 david 1302: <li><a href="errata24.html#nlink">Feb 25, 1999: An unbounded increment on the
1.90 deraadt 1303: nlink value in FFS and EXT2FS filesystems can cause a system crash.
1.89 deraadt 1304: (patch included).</a>
1.294 david 1305: <li><a href="errata24.html#ping">Feb 23, 1999: Yet another buffer overflow
1.88 deraadt 1306: existed in ping(8). (patch included).</a>
1.294 david 1307: <li><a href="errata24.html#ipqrace">Feb 19, 1999: ipintr() had a race in use of
1.87 deraadt 1308: the ipq, which could permit an attacker to cause a crash.
1309: (patch included).</a>
1.294 david 1310: <li><a href="errata24.html#accept">Feb 17, 1999: A race condition in the
1.86 deraadt 1311: kernel between accept(2) and select(2) could permit an attacker
1312: to hang sockets from remote.
1313: (patch included).</a>
1.294 david 1314: <li><a href="errata24.html#maxqueue">Feb 17, 1999: IP fragment assembly can
1.85 deraadt 1315: bog the machine excessively and cause problems.
1316: (patch included).</a>
1.294 david 1317: <li><a href="errata24.html#trctrap">Feb 12, 1999: i386 T_TRCTRAP handling and
1.84 deraadt 1318: DDB interacted to possibly cause a crash.
1319: (patch included).</a>
1.294 david 1320: <li><a href="errata24.html#rst">Feb 11, 1999: TCP/IP RST handling was sloppy.
1.83 deraadt 1321: (patch included).</a>
1.294 david 1322: <li><a href="errata24.html#bootpd">Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 1323: problem in bootpd(8). (patch included).</a>
1.294 david 1324: <li><a href="errata24.html#termcap">Nov 19, 1998: There is a possibly locally
1.82 deraadt 1325: exploitable problem relating to environment variables in termcap
1326: and curses. (patch included).</a>
1.294 david 1327: <li><a href="errata24.html#tcpfix">Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 1328: bug in the TCP decoding kernel. (patch included).</a>
1.75 deraadt 1329: </ul>
1330:
1.106 deraadt 1331: <p>
1332: <li>
1.288 matthieu 1333: <a name="23"></a>
1.235 miod 1334:
1.294 david 1335: <h3><font color="#e00000">OpenBSD 2.3 Security Advisories</font></h3>
1.73 deraadt 1336: These are the OpenBSD 2.3 advisories -- all these problems are solved
1.294 david 1337: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.73 deraadt 1338: OpenBSD 2.2 advisories listed below are fixed in OpenBSD 2.3.
1.53 matthieu 1339:
1.96 deraadt 1340: <p>
1.53 matthieu 1341: <ul>
1.294 david 1342: <li><a href="errata23.html#bootpd">Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 1343: problem in bootpd(8). (patch included).</a>
1.294 david 1344: <li><a href="errata23.html#tcpfix">Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 1345: bug in the TCP decoding kernel. (patch included).</a>
1.294 david 1346: <li><a href="errata23.html#resolver">August 31, 1998: A benign looking resolver
1.190 mpech 1347: buffer overflow bug was re-introduced accidentally (patches included).</a>
1.294 david 1348: <li><a href="errata23.html#chpass">Aug 2, 1998:
1.190 mpech 1349: chpass(1) has a file descriptor leak which allows an
1350: attacker to modify /etc/master.passwd.</a>
1.294 david 1351: <li><a href="errata23.html#inetd">July 15, 1998: Inetd had a file descriptor leak.</a>
1352: <li><a href="errata23.html#fdalloc">Jul 2, 1998: setuid and setgid processes
1.72 deraadt 1353: should not be executed with fd slots 0, 1, or 2 free.
1354: (patch included).</a>
1.294 david 1355: <li><a href="errata23.html#xlib">June 6, 1998: Further problems with the X
1.71 deraadt 1356: libraries (patches included).</a>
1.294 david 1357: <li><a href="errata23.html#kill">May 17, 1998: kill(2) of setuid/setgid target
1.66 deraadt 1358: processes too permissive (4th revision patch included).</a>
1.294 david 1359: <li><a href="errata23.html#immutable">May 11, 1998: mmap() permits partial bypassing
1.60 deraadt 1360: of immutable and append-only file flags. (patch included).</a>
1.294 david 1361: <li><a href="errata23.html#ipsec">May 5, 1998: Incorrect handling of IPSEC packets
1.190 mpech 1362: if IPSEC is enabled (patch included).</a>
1.294 david 1363: <li><a href="errata23.html#xterm-xaw">May 1, 1998: Buffer overflow in xterm and Xaw
1.58 deraadt 1364: (CERT advisory VB-98.04) (patch included).</a>
1.53 matthieu 1365: </ul>
1.9 deraadt 1366:
1.106 deraadt 1367: <p>
1368: <li>
1.288 matthieu 1369: <a name="22"></a>
1.235 miod 1370:
1.294 david 1371: <h3><font color="#e00000">OpenBSD 2.2 Security Advisories</font></h3>
1.45 deraadt 1372: These are the OpenBSD 2.2 advisories. All these problems are solved
1.294 david 1373: in <a href="23.html">OpenBSD 2.3</a>. Some of these problems
1.45 deraadt 1374: still exist in other operating systems. (The supplied patches are for
1375: OpenBSD 2.2; they may or may not work on OpenBSD 2.1).
1.9 deraadt 1376:
1.96 deraadt 1377: <p>
1.9 deraadt 1378: <ul>
1.294 david 1379: <li><a href="errata22.html#ipsec">May 5, 1998: Incorrect handling of IPSEC
1.72 deraadt 1380: packets if IPSEC is enabled (patch included).</a>
1.294 david 1381: <li><a href="errata22.html#xterm-xaw">May 1, 1998: Buffer overflow in xterm
1.72 deraadt 1382: and Xaw (CERT advisory VB-98.04) (patch included).</a>
1.294 david 1383: <li><a href="errata22.html#uucpd">Apr 22, 1998: Buffer overflow in uucpd
1.72 deraadt 1384: (patch included).</a>
1.294 david 1385: <li><a href="errata22.html#rmjob">Apr 22, 1998: Buffer mismanagement in lprm
1.72 deraadt 1386: (patch included).</a>
1.294 david 1387: <li><a href="errata22.html#ping">Mar 31, 1998: Overflow in ping -R (patch included).</a>
1388: <li><a href="errata22.html#named">Mar 30, 1998: Overflow in named fake-iquery
1.59 deraadt 1389: (patch included).</a>
1.294 david 1390: <li><a href="errata22.html#mountd">Mar 2, 1998: Accidental NFS filesystem
1.72 deraadt 1391: export (patch included).</a>
1.112 philen 1392: <li><a href="advisories/mmap.txt">Feb 26, 1998: Read-write mmap() flaw.</a>
1.294 david 1393: Revision 3 of the patch is available <a href="errata22.html#mmap">here</a>
1.112 philen 1394: <li><a href="advisories/sourceroute.txt">Feb 19, 1998: Sourcerouted Packet
1.59 deraadt 1395: Acceptance.</a>
1.294 david 1396: A patch is available <a href="errata22.html#sourceroute">here</a>.
1397: <li><a href="errata22.html#ruserok">Feb 13, 1998: Setuid coredump & Ruserok()
1.72 deraadt 1398: flaw (patch included).</a>
1.294 david 1399: <li><a href="errata22.html#ldso">Feb 9, 1998: MIPS ld.so flaw (patch included).</a>
1.1 deraadt 1400: </ul>
1401:
1.106 deraadt 1402: <p>
1403: <li>
1.288 matthieu 1404: <a name="21"></a>
1.235 miod 1405:
1.294 david 1406: <h3><font color="#e00000">OpenBSD 2.1 Security Advisories</font></h3>
1.52 deraadt 1407: These are the OpenBSD 2.1 advisories. All these problems are solved
1.294 david 1408: in <a href="22.html">OpenBSD 2.2</a>. Some of these problems still
1.52 deraadt 1409: exist in other operating systems. (If you are running OpenBSD 2.1, we
1410: would strongly recommend an upgrade to the newest release, as this
1411: patch list only attempts at fixing the most important security
1412: problems. In particular, OpenBSD 2.2 fixes numerous localhost
1413: security problems. Many of those problems were solved in ways which
1414: make it hard for us to provide patches).
1415:
1.96 deraadt 1416: <p>
1.52 deraadt 1417: <ul>
1.112 philen 1418: <li><a href="advisories/signals.txt">Sep 15, 1997: Deviant Signals (patch included)</a>
1419: <li><a href="advisories/rfork.txt">Aug 2, 1997: Rfork() system call flaw
1.59 deraadt 1420: (patch included)</a>
1.112 philen 1421: <li><a href="advisories/procfs.txt">Jun 24, 1997: Procfs flaws (patch included)</a>
1.52 deraadt 1422: </ul>
1.51 deraadt 1423:
1.106 deraadt 1424: <p>
1425: <li>
1.288 matthieu 1426: <a name="20"></a>
1.235 miod 1427:
1.294 david 1428: <h3><font color="#e00000">OpenBSD 2.0 Security Advisories</font></h3>
1.99 deraadt 1429: These are the OpenBSD 2.0 advisories. All these problems are solved
1.294 david 1430: in <a href="21.html">OpenBSD 2.1</a>. Some of these problems still
1.99 deraadt 1431: exist in other operating systems. (If you are running OpenBSD 2.0, we
1432: commend you for being there back in the old days!, but you're really
1433: missing out if you don't install a new version!)
1434:
1435: <p>
1436: <ul>
1.112 philen 1437: <li><a href="advisories/res_random.txt">April 22, 1997: Predictable IDs in the
1.99 deraadt 1438: resolver (patch included)</a>
1439: <li>Many others... if people can hunt them down, please let me know
1440: and we'll put them up here.
1441: </ul>
1.51 deraadt 1442: <p>
1.106 deraadt 1443:
1.288 matthieu 1444: <a name="watching"></a>
1.294 david 1445: <li><h3><font color="#e00000">Watching our Changes</font></h3><p>
1.106 deraadt 1446:
1.21 deraadt 1447: Since we take a proactive stance with security, we are continually
1448: finding and fixing new security problems. Not all of these problems
1.80 espie 1449: get widely reported because (as stated earlier) many of them are not
1.45 deraadt 1450: confirmed to be exploitable; many simple bugs we fix do turn out to
1451: have security consequences we could not predict. We do not have the
1452: time resources to make these changes available in the above format.<p>
1.21 deraadt 1453:
1454: Thus there are usually minor security fixes in the current source code
1455: beyond the previous major OpenBSD release. We make a limited
1.45 deraadt 1456: guarantee that these problems are of minimal impact and unproven
1.44 ian 1457: exploitability. If we discover that a problem definitely matters for
1.45 deraadt 1458: security, patches will show up here <strong>VERY</strong> quickly.<p>
1.21 deraadt 1459:
1.45 deraadt 1460: People who are really concerned with security can do a number of
1461: things:<p>
1.21 deraadt 1462:
1463: <ul>
1464: <li>If you understand security issues, watch our
1.294 david 1465: <a href="mail.html">source-changes mailing list</a> and keep an
1.23 deraadt 1466: eye out for things which appear security related. Since
1.21 deraadt 1467: exploitability is not proven for many of the fixes we make,
1468: do not expect the relevant commit message to say "SECURITY FIX!".
1469: If a problem is proven and serious, a patch will be available
1470: here very shortly after.
1.161 horacio 1471: <li>In addition to source changes, you can watch our <a href="mail.html">
1.160 ericj 1472: security-announce mailing list</a> which will notify you for every
1.186 ian 1473: security related item that the OpenBSD team deems as a possible threat,
1.160 ericj 1474: and instruct you on how to patch the problem.
1.21 deraadt 1475: <li>Track our current source code tree, and teach yourself how to do a
1.29 deraadt 1476: complete system build from time to time (read /usr/src/Makefile
1477: carefully). Users can make the assumption that the current
1478: source tree always has stronger security than the previous release.
1.45 deraadt 1479: However, building your own system from source code is not trivial;
1.265 miod 1480: it is nearly 600MB of source code, and problems do occur as we
1.45 deraadt 1481: transition between major releases.
1.115 ericj 1482: <li>Install a binary snapshot for your
1.80 espie 1483: architecture, which are made available fairly often. For
1.29 deraadt 1484: instance, an i386 snapshot is typically made available weekly.
1.21 deraadt 1485: </ul>
1486:
1.9 deraadt 1487: <p>
1.288 matthieu 1488: <a name="reporting"></a>
1.294 david 1489: <li><h3><font color="#e00000">Reporting problems</font></h3><p>
1.3 deraadt 1490:
1.5 deraadt 1491: <p> If you find a new security problem, you can mail it to
1.294 david 1492: <a href="mailto:deraadt@openbsd.org">deraadt@openbsd.org</a>.
1.7 deraadt 1493: <br>
1.5 deraadt 1494: If you wish to PGP encode it (but please only do so if privacy is very
1.112 philen 1495: urgent, since it is inconvenient) use this <a href="advisories/pgpkey.txt">pgp key</a>.
1.5 deraadt 1496:
1.107 deraadt 1497: <p>
1.288 matthieu 1498: <a name="papers"></a>
1.294 david 1499: <li><h3><font color="#e00000">Further Reading</font></h3><p>
1.107 deraadt 1500:
1501: A number of papers have been written by OpenBSD team members, about security
1502: related changes they have done in OpenBSD. The postscript versions of these
1.108 deraadt 1503: documents are available as follows.<p>
1.107 deraadt 1504:
1505: <ul>
1.113 deraadt 1506: <li>A Future-Adaptable Password Scheme.<br>
1.294 david 1507: <a href="events.html#usenix99">Usenix 1999</a>,
1508: by <a href="mailto:provos@openbsd.org">Niels Provos</a>,
1509: <a href="mailto:dm@openbsd.org">David Mazieres</a>.<br>
1510: <a href="papers/bcrypt-paper.ps">paper</a> and
1511: <a href="papers/bcrypt-slides.ps">slides</a>.
1.113 deraadt 1512: <p>
1513: <li>Cryptography in OpenBSD: An Overview.<br>
1.294 david 1514: <a href="events.html#usenix99">Usenix 1999</a>,
1515: by <a href="mailto:deraadt@openbsd.org">Theo de Raadt</a>,
1516: <a href="mailto:niklas@openbsd.org">Niklas Hallqvist</a>,
1517: <a href="mailto:art@openbsd.org">Artur Grabowski</a>,
1518: <a href="mailto:angelos@openbsd.org">Angelos D. Keromytis</a>,
1519: <a href="mailto:provos@openbsd.org">Niels Provos</a>.<br>
1520: <a href="papers/crypt-paper.ps">paper</a> and
1521: <a href="papers/crypt-slides.ps">slides</a>.
1.113 deraadt 1522: <p>
1523: <li>strlcpy and strlcat -- consistent, safe, string copy and concatenation.<br>
1.294 david 1524: <a href="events.html#usenix99">Usenix 1999</a>,
1525: by <a href="mailto:millert@openbsd.org">Todd C. Miller</a>,
1526: <a href="mailto:deraadt@openbsd.org">Theo de Raadt</a>.<br>
1527: <a href="papers/strlcpy-paper.ps">paper</a> and
1528: <a href="papers/strlcpy-slides.ps">slides</a>.
1.113 deraadt 1529: <p>
1.118 deraadt 1530: <li>Dealing with Public Ethernet Jacks-Switches, Gateways, and Authentication.<br>
1.294 david 1531: <a href="events.html#lisa99">LISA 1999</a>,
1532: by <a href="mailto:beck@openbsd.org">Bob Beck</a>.<br>
1533: <a href="papers/authgw-paper.ps">paper</a> and
1534: <a href="papers/authgw-slides.ps">slides</a>.
1.118 deraadt 1535: <p>
1.153 jufi 1536: <li>Encrypting Virtual Memory<br>
1.294 david 1537: <a href="events.html#sec2000">Usenix Security 2000</a>,
1538: <a href="mailto:provos@openbsd.org">Niels Provos</a>.<br>
1539: <a href="papers/swapencrypt.ps">paper</a> and
1540: <a href="papers/swapencrypt-slides.ps">slides</a>.
1.142 deraadt 1541: <p>
1.107 deraadt 1542: </ul>
1.294 david 1543: </ul>
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1.294 david 1546: <a href="index.html"><img height=24 width=24 src="back.gif" border=0 alt="OpenBSD"></a>
1547: <a href="mailto:www@openbsd.org">www@openbsd.org</a>
1.24 deraadt 1548: <br>
1.341 ! reyk 1549: <small>$OpenBSD: security.html,v 1.340 2007/03/09 20:52:12 deraadt Exp $</small>
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