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1.106 deraadt 17: <p>
1.294 david 18: <h2><font color="#e00000">Security</font></h2>
19: <hr>
1.1 deraadt 20:
1.114 philen 21: <table width="100%">
22: <tr>
23: <td colspan="2">
24: <strong>Index</strong>
25: </td>
26: </tr>
27: <tr>
28: <td valign="top">
1.294 david 29: <a href="#goals">Security goals of the Project</a>.<br>
30: <a href="#disclosure">Full Disclosure policy</a>.<br>
31: <a href="#process">Source code auditing process</a>.<br>
32: <a href="#default">"Secure by Default"</a>.<br>
33: <a href="#crypto">Use of Cryptography</a>.<br>
34: <p>
35: <a href="#watching">Watching changes</a>.<br>
36: <a href="#reporting">Reporting security issues</a>.<br>
37: <a href="#papers">Further Reading</a><br>
1.106 deraadt 38: <p>
1.114 philen 39: </td>
40: <td valign="top">
1.225 deraadt 41: For security advisories for specific releases, click below:<br>
42: <a href="#20">2.0</a>,
43: <a href="#21">2.1</a>,
44: <a href="#22">2.2</a>,
45: <a href="#23">2.3</a>,
46: <a href="#24">2.4</a>,
47: <a href="#25">2.5</a>,
48: <a href="#26">2.6</a>,
49: <a href="#27">2.7</a>,
50: <a href="#28">2.8</a>,
51: <a href="#29">2.9</a>,
52: <a href="#30">3.0</a>,
53: <a href="#31">3.1</a>,
1.246 deraadt 54: <a href="#32">3.2</a>,
1.261 david 55: <a href="#33">3.3</a>,
1.280 david 56: <a href="#34">3.4</a>,
1.301 miod 57: <a href="#35">3.5</a>,
1.312 david 58: <a href="#36">3.6</a>,
1.318 deraadt 59: <a href="#37">3.7</a>,
1.321 brad 60: <a href="#38">3.8</a>,
1.334 brad 61: <a href="#39">3.9</a>,
62: <a href="#40">4.0</a>.
1.114 philen 63: </td>
64: </tr>
65: </table>
1.56 deraadt 66: <hr>
67:
1.294 david 68: <a name="goals"></a>
1.278 deraadt 69: <ul>
1.294 david 70: <li><h3><font color="#e00000">Goal</font></h3><p>
1.22 deraadt 71:
1.14 deraadt 72: OpenBSD believes in strong security. Our aspiration is to be NUMBER
1.22 deraadt 73: ONE in the industry for security (if we are not already there). Our
74: open software development model permits us to take a more
75: uncompromising view towards increased security than Sun, SGI, IBM, HP,
76: or other vendors are able to. We can make changes the vendors would
1.27 deraadt 77: not make. Also, since OpenBSD is exported with <a href=crypto.html>
1.45 deraadt 78: cryptography</a>, we are able to take cryptographic approaches towards
79: fixing security problems.<p>
1.18 deraadt 80:
1.288 matthieu 81: <a name="disclosure"></a>
1.294 david 82: <li><h3><font color="#e00000">Full Disclosure</font></h3><p>
1.106 deraadt 83:
1.45 deraadt 84: Like many readers of the
1.196 jufi 85: <a href="http://online.securityfocus.com/archive/1">
1.18 deraadt 86: BUGTRAQ mailing list</a>,
1.106 deraadt 87: we believe in full disclosure of security problems. In the
88: operating system arena, we were probably the first to embrace
89: the concept. Many vendors, even of free software, still try
90: to hide issues from their users.<p>
91:
92: Security information moves very fast in cracker circles. On the other
93: hand, our experience is that coding and releasing of proper security
94: fixes typically requires about an hour of work -- very fast fix
95: turnaround is possible. Thus we think that full disclosure helps the
96: people who really care about security.<p>
97:
1.288 matthieu 98: <a name="process"></a>
1.294 david 99: <li><h3><font color="#e00000">Audit Process</font></h3><p>
1.15 deraadt 100:
1.12 deraadt 101: Our security auditing team typically has between six and twelve
1.45 deraadt 102: members who continue to search for and fix new security holes. We
103: have been auditing since the summer of 1996. The process we follow to
104: increase security is simply a comprehensive file-by-file analysis of
1.106 deraadt 105: every critical software component. We are not so much looking for
106: security holes, as we are looking for basic software bugs, and if
1.138 deraadt 107: years later someone discovers the problem used to be a security
1.106 deraadt 108: issue, and we fixed it because it was just a bug, well, all the
109: better. Flaws have been found in just about every area of the system.
110: Entire new classes of security problems have been found during our
111: audit, and often source code which had been audited earlier needs
112: re-auditing with these new flaws in mind. Code often gets audited
113: multiple times, and by multiple people with different auditing
114: skills.<p>
1.12 deraadt 115:
1.94 deraadt 116: Some members of our security auditing team worked for Secure Networks,
117: the company that made the industry's premier network security scanning
118: software package Ballista (Secure Networks got purchased by Network
119: Associates, Ballista got renamed to Cybercop Scanner, and well...)
120: That company did a lot of security research, and thus fit in well
1.106 deraadt 121: with the OpenBSD stance. OpenBSD passed Ballista's tests with flying
122: colours since day 1.<p>
1.31 deraadt 123:
1.34 deraadt 124: Another facet of our security auditing process is its proactiveness.
1.45 deraadt 125: In most cases we have found that the determination of exploitability
126: is not an issue. During our ongoing auditing process we find many
127: bugs, and endeavor to fix them even though exploitability is not
128: proven. We fix the bug, and we move on to find other bugs to fix. We
129: have fixed many simple and obvious careless programming errors in code
130: and only months later discovered that the problems were in fact
131: exploitable. (Or, more likely someone on
1.197 jufi 132: <a href="http://online.securityfocus.com/archive/1">BUGTRAQ</a>
1.45 deraadt 133: would report that other operating systems were vulnerable to a `newly
134: discovered problem', and then it would be discovered that OpenBSD had
135: been fixed in a previous release). In other cases we have been saved
136: from full exploitability of complex step-by-step attacks because we
137: had fixed one of the intermediate steps. An example of where we
1.94 deraadt 138: managed such a success is the lpd advisory that Secure Networks put out.
139: <p>
1.29 deraadt 140:
1.288 matthieu 141: <a name="newtech"></a>
1.294 david 142: <li><h3><font color="#e00000">New Technologies</font></h3><p>
1.278 deraadt 143:
144: As we audit source code, we often invent new ways of solving problems.
145: Sometimes these ideas have been used before in some random application
146: written somewhere, but perhaps not taken to the degree that we do.
147: <p>
148:
149: <ul>
150: <li>strlcpy() and strlcat()
151: <li>Memory protection purify
152: <ul>
153: <li>W^X
154: <li>.rodata segment
155: <li>Guard pages
156: <li>Randomized malloc()
157: <li>Randomized mmap()
158: <li>atexit() and stdio protection
159: </ul>
1.295 otto 160: <li>Privilege separation
1.278 deraadt 161: <li>Privilege revocation
162: <li>Chroot jailing
163: <li>New uids
164: <li>ProPolice
165: <li>... and others
166: </ul>
167: <p>
168:
1.294 david 169: <li><h3><font color="#e00000">The Reward</font></h3><p>
1.106 deraadt 170:
1.45 deraadt 171: Our proactive auditing process has really paid off. Statements like
1.35 deraadt 172: ``This problem was fixed in OpenBSD about 6 months ago'' have become
1.45 deraadt 173: commonplace in security forums like
1.197 jufi 174: <a href="http://online.securityfocus.com/archive/1">BUGTRAQ</a>.<p>
1.35 deraadt 175:
1.45 deraadt 176: The most intense part of our security auditing happened immediately
1.80 espie 177: before the OpenBSD 2.0 release and during the 2.0->2.1 transition,
1.45 deraadt 178: over the last third of 1996 and first half of 1997. Thousands (yes,
179: thousands) of security issues were fixed rapidly over this year-long
180: period; bugs like the standard buffer overflows, protocol
181: implementation weaknesses, information gathering, and filesystem
182: races. Hence most of the security problems that we encountered were
183: fixed before our 2.1 release, and then a far smaller number needed
184: fixing for our 2.2 release. We do not find as many problems anymore,
185: it is simply a case of diminishing returns. Recently the security
186: problems we find and fix tend to be significantly more obscure or
187: complicated. Still we will persist for a number of reasons:<p>
1.36 deraadt 188:
1.35 deraadt 189: <ul>
1.45 deraadt 190: <li>Occasionally we find a simple problem we missed earlier. Doh!
1.35 deraadt 191: <li>Security is like an arms race; the best attackers will continue
1.45 deraadt 192: to search for more complicated exploits, so we will too.
193: <li>Finding and fixing subtle flaws in complicated software is
194: a lot of fun.
1.35 deraadt 195: </ul>
1.106 deraadt 196: <p>
1.15 deraadt 197:
1.14 deraadt 198: The auditing process is not over yet, and as you can see we continue
1.28 deraadt 199: to find and fix new security flaws.<p>
1.12 deraadt 200:
1.288 matthieu 201: <a name="default"></a>
1.294 david 202: <li><h3><font color="#e00000">"Secure by Default"</font></h3><p>
1.106 deraadt 203:
204: To ensure that novice users of OpenBSD do not need to become security
205: experts overnight (a viewpoint which other vendors seem to have), we
206: ship the operating system in a Secure by Default mode. All non-essential
207: services are disabled. As the user/administrator becomes more familiar
208: with the system, he will discover that he has to enable daemons and other
209: parts of the system. During the process of learning how to enable a new
210: service, the novice is more likely to learn of security considerations.<p>
211:
212: This is in stark contrast to the increasing number of systems that
213: ship with NFS, mountd, web servers, and various other services enabled
214: by default, creating instantaneous security problems for their users
215: within minutes after their first install.<p>
216:
1.288 matthieu 217: <a name="crypto"></a>
1.294 david 218: <li><h3><font color="#e00000">Cryptography</font></h3><p>
1.106 deraadt 219:
220: And of course, since the OpenBSD project is based in Canada, it is possible
221: for us to integrate cryptography. For more information, read the page
1.116 deraadt 222: outlining <a href=crypto.html>what we have done with cryptography</a>.</p>
1.106 deraadt 223:
1.294 david 224: <li><h3><font color="#e00000">Advisories</font></h3><p>
1.106 deraadt 225:
226: <li>
1.334 brad 227: <a name="40"></a>
228:
229: <h3><font color="#e00000">OpenBSD 4.0 Security Advisories</font></h3>
230: These are the OpenBSD 4.0 advisories -- all these problems are solved
231: in <a href=anoncvs.html>OpenBSD current</a> and the
232: <a href=stable.html>patch branch</a>.
233:
234: <p>
235: <ul>
1.340 ! deraadt 236: <li><a href="errata40.html#m_dup1">Mar 7, 2007:
! 237: Incorrect mbuf handling for ICMP6 packets.</a>
1.339 deraadt 238: <li><a href="errata40.html#agp">Jan 3, 2007:
1.338 miod 239: Insufficient validation in vga(4) may allow an attacker to gain
240: root privileges on some i386 systems.</a>
1.339 deraadt 241: <li><a href="errata40.html#ldso">Nov 19, 2006:
1.337 deraadt 242: ld.so(1) fails to properly sanitize the environment.</a>
1.339 deraadt 243: <li><a href="errata40.html#systrace">Nov 4, 2006:
1.334 brad 244: Fix for an integer overflow in systrace(4)'s STRIOCREPLACE support,
245: found by Chris Evans.</a>
1.339 deraadt 246: <li><a href="errata40.html#openssl">Nov 4, 2006:
1.334 brad 247: Several problems have been found in OpenSSL.</a>
1.339 deraadt 248: <li><a href="errata40.html#httpd">Nov 4, 2006:
1.334 brad 249: httpd(8) does not sanitize the Expect header from an HTTP request
250: when it is reflected back in an error message, which might allow
251: cross-site scripting (XSS) style attacks.</a>
252: </ul>
253:
254: <li>
1.321 brad 255: <a name="39"></a>
256:
257: <h3><font color="#e00000">OpenBSD 3.9 Security Advisories</font></h3>
258: These are the OpenBSD 3.9 advisories -- all these problems are solved
259: in <a href=anoncvs.html>OpenBSD current</a> and the
260: <a href=stable.html>patch branch</a>.
261:
262: <p>
263: <ul>
1.340 ! deraadt 264: <li><a href="errata39.html#m_dup1">Mar 7, 2007:
! 265: Incorrect mbuf handling for ICMP6 packets.</a>
1.338 miod 266: <li><a href="errata39.html#agp">Jan 3, 2007:
267: Insufficient validation in vga(4) may allow an attacker to gain
268: root privileges on some i386 systems.</a>
1.336 brad 269: <li><a href="errata39.html#ldso">Nov 19, 2006:
1.337 deraadt 270: ld.so(1) fails to properly sanitize the environment.</a>
1.333 deraadt 271: <li><a href="errata39.html#ssh">Oct 12, 2006:
1.332 brad 272: Fix 2 security bugs found in OpenSSH.</a>
1.333 deraadt 273: <li><a href="errata39.html#systrace">Oct 7, 2006:
1.331 brad 274: Fix for an integer overflow in systrace(4)'s STRIOCREPLACE support,
1.330 brad 275: found by Chris Evans.</a>
1.333 deraadt 276: <li><a href="errata39.html#openssl2">Oct 7, 2006:
1.330 brad 277: Several problems have been found in OpenSSL.</a>
1.333 deraadt 278: <li><a href="errata39.html#httpd2">Oct 7, 2006:
1.330 brad 279: httpd(8) does not sanitize the Expect header from an HTTP request
280: when it is reflected back in an error message, which might allow
281: cross-site scripting (XSS) style attacks.</a>
1.333 deraadt 282: <li><a href="errata39.html#openssl">Sep 8, 2006:
1.329 brad 283: Due to incorrect PKCS#1 v1.5 padding validation in OpenSSL, it is
284: possible for an attacker to construct an invalid signature which
285: OpenSSL would accept as a valid PKCS#1 v1.5 signature.</a>
1.333 deraadt 286: <li><a href="errata39.html#bind">Sep 8, 2006:
1.328 brad 287: Two Denial of Service issues have been found with BIND.</a>
1.333 deraadt 288: <li><a href="errata39.html#sppp">Sep 2, 2006:
1.327 brad 289: Due to the failure to correctly validate LCP configuration option
290: lengths, it is possible for an attacker to send LCP packets via an
291: sppp(4) connection causing the kernel to panic.</a>
1.333 deraadt 292: <li><a href="errata39.html#isakmpd">Aug 25, 2006:
1.326 brad 293: A problem in isakmpd(8) caused IPsec to run partly without replay
294: protection.</a>
1.333 deraadt 295: <li><a href="errata39.html#sem">Aug 25, 2006:
1.326 brad 296: It is possible to cause the kernel to panic when more than the default
297: number of sempahores have been allocated.</a>
1.333 deraadt 298: <li><a href="errata39.html#dhcpd">Aug 25, 2006:
1.326 brad 299: Due to an off-by-one error in dhcpd(8) it is possible to cause dhcpd(8)
300: to exit by sending a DHCPDISCOVER packet with a 32-byte client identifier
301: option.</a>
1.333 deraadt 302: <li><a href="errata39.html#sendmail3">Aug 25, 2006:
1.326 brad 303: A potential denial of service problem has been found in sendmail.</a>
1.333 deraadt 304: <li><a href="errata39.html#httpd">Jul 30, 2006:
1.325 brad 305: httpd(8)'s mod_rewrite has a potentially exploitable off-by-one buffer
306: overflow.</a>
1.333 deraadt 307: <li><a href="errata39.html#sendmail2">Jun 15, 2006:
1.324 brad 308: A potential denial of service problem has been found in sendmail.</a>
1.333 deraadt 309: <li><a href="errata39.html#xorg">May 2, 2006:
1.322 brad 310: A buffer overflow exists in the Render extension of the X server.</a>
1.333 deraadt 311: <li><a href="errata39.html#sendmail">Mar 25, 2006:
1.321 brad 312: A race condition has been reported to exist in the handling by sendmail
313: of asynchronous signals.</a>
314: </ul>
315:
1.338 miod 316: <p>
317: OpenBSD 3.8 and earlier releases are not supported anymore. The following
318: paragraphs only list advisories issued while they were maintained; these
319: releases are likely to be affected by the advisories for more recent releases.
320: <br>
321:
1.321 brad 322: <li>
1.318 deraadt 323: <a name="38"></a>
324:
325: <h3><font color="#e00000">OpenBSD 3.8 Security Advisories</font></h3>
326: These are the OpenBSD 3.8 advisories -- all these problems are solved
327: in <a href=anoncvs.html>OpenBSD current</a> and the
328: <a href=stable.html>patch branch</a>.
329:
330: <p>
331: <ul>
1.332 brad 332: <li><a href="errata38.html#ssh2">Oct 12, 2006:
333: Fix 2 security bugs found in OpenSSH.</a>
1.330 brad 334: <li><a href="errata38.html#systrace">Oct 7, 2006:
1.331 brad 335: Fix for an integer overflow in systrace(4)'s STRIOCREPLACE support,
1.330 brad 336: found by Chris Evans.</a>
337: <li><a href="errata38.html#openssl2">Oct 7, 2006:
338: Several problems have been found in OpenSSL.</a>
339: <li><a href="errata38.html#httpd2">Oct 7, 2006:
340: httpd(8) does not sanitize the Expect header from an HTTP request
341: when it is reflected back in an error message, which might allow
342: cross-site scripting (XSS) style attacks.</a>
1.329 brad 343: <li><a href="errata38.html#openssl">Sep 8, 2006:
344: Due to incorrect PKCS#1 v1.5 padding validation in OpenSSL, it is
345: possible for an attacker to construct an invalid signature which
346: OpenSSL would accept as a valid PKCS#1 v1.5 signature.</a>
1.328 brad 347: <li><a href="errata38.html#bind">Sep 8, 2006:
348: Two Denial of Service issues have been found with BIND.</a>
1.327 brad 349: <li><a href="errata38.html#sppp">Sep 2, 2006:
350: Due to the failure to correctly validate LCP configuration option
351: lengths, it is possible for an attacker to send LCP packets via an
352: sppp(4) connection causing the kernel to panic.</a>
1.326 brad 353: <li><a href="errata38.html#isakmpd">Aug 25, 2006:
354: A problem in isakmpd(8) caused IPsec to run partly without replay
355: protection.</a>
356: <li><a href="errata38.html#sem">Aug 25, 2006:
357: It is possible to cause the kernel to panic when more than the default
358: number of sempahores have been allocated.</a>
359: <li><a href="errata38.html#dhcpd">Aug 25, 2006:
360: Due to an off-by-one error in dhcpd(8) it is possible to cause dhcpd(8)
361: to exit by sending a DHCPDISCOVER packet with a 32-byte client identifier
362: option.</a>
363: <li><a href="errata38.html#sendmail3">Aug 25, 2006:
364: A potential denial of service problem has been found in sendmail.</a>
1.325 brad 365: <li><a href="errata38.html#httpd">Jul 30, 2006:
366: httpd(8)'s mod_rewrite has a potentially exploitable off-by-one buffer
367: overflow.</a>
1.324 brad 368: <li><a href="errata38.html#sendmail2">Jun 15, 2006:
369: A potential denial of service problem has been found in sendmail.</a>
1.322 brad 370: <li><a href="errata38.html#xorg">May 2, 2006:
371: A buffer overflow exists in the Render extension of the X server.</a>
1.321 brad 372: <li><a href="errata38.html#sendmail">Mar 25, 2006:
373: A race condition has been reported to exist in the handling by sendmail
374: of asynchronous signals.</a>
375: <li><a href="errata38.html#ssh">Feb 12, 2006:
1.320 brad 376: Josh Bressers has reported a weakness in OpenSSH caused due to the
377: insecure use of the system(3) function in scp(1) when performing copy
378: operations using filenames that are supplied by the user from the
379: command line.</a>
1.321 brad 380: <li><a href="errata38.html#fd">Jan 5, 2006:
1.319 brad 381: Do not allow users to trick suid programs into re-opening files via
382: /dev/fd.</a>
1.321 brad 383: <li><a href="errata38.html#perl">Jan 5, 2006:
1.319 brad 384: A buffer overflow has been found in the Perl interpreter with the
385: sprintf function which may be exploitable under certain conditions.</a>
1.318 deraadt 386: </ul>
387:
388: <li>
1.312 david 389: <a name="37"></a>
390:
391: <h3><font color="#e00000">OpenBSD 3.7 Security Advisories</font></h3>
392: These are the OpenBSD 3.7 advisories -- all these problems are solved
1.323 steven 393: in <a href="anoncvs.html">OpenBSD current</a>. The
394: <a href="stable.html">patch branch</a> for 3.7 is no longer being maintained,
395: you should update your machine.
1.312 david 396:
397: <p>
398: <ul>
1.322 brad 399: <li><a href="errata37.html#xorg">May 2, 2006:
400: A buffer overflow exists in the Render extension of the X server.</a>
1.321 brad 401: <li><a href="errata37.html#sendmail">Mar 25, 2006:
402: A race condition has been reported to exist in the handling by sendmail
403: of asynchronous signals.</a>
1.320 brad 404: <li><a href="errata37.html#ssh">Feb 12, 2006:
405: Josh Bressers has reported a weakness in OpenSSH caused due to the
406: insecure use of the system(3) function in scp(1) when performing copy
407: operations using filenames that are supplied by the user from the
408: command line.</a>
1.319 brad 409: <li><a href="errata37.html#fd">Jan 5, 2006:
410: Do not allow users to trick suid programs into re-opening files via
411: /dev/fd.</a>
412: <li><a href="errata37.html#perl">Jan 5, 2006:
413: A buffer overflow has been found in the Perl interpreter with the
414: sprintf function which may be exploitable under certain conditions.</a>
1.318 deraadt 415: <li><a href="errata37.html#libz2">Jul 21, 2005:
1.317 millert 416: Fix another buffer overflow in the zlib library that may be exploitable.</a>
1.318 deraadt 417: <li><a href="errata37.html#libz">Jul 6, 2005:
1.316 millert 418: Fix a buffer overflow in the zlib library that may be exploitable.</a>
1.318 deraadt 419: <li><a href="errata37.html#sudo">Jun 20, 2005:
1.316 millert 420: Fix a race condition in sudo(8) that could allow a user
1.315 millert 421: to run arbitrary commands.</a>
1.318 deraadt 422: <li><a href="errata37.html#cvs">Jun 7, 2005:
1.313 brad 423: Fix a buffer overflow, memory leaks, and NULL pointer
424: dereference in cvs(1).</a>
1.312 david 425: </ul>
426:
427: <li>
1.301 miod 428: <a name="36"></a>
429:
430: <h3><font color="#e00000">OpenBSD 3.6 Security Advisories</font></h3>
431: These are the OpenBSD 3.6 advisories -- all these problems are solved
1.323 steven 432: in <a href="anoncvs.html">OpenBSD current</a>. The
433: <a href="stable.html">patch branch</a> for 3.6 is no longer being maintained,
434: you should update your machine.
1.301 miod 435:
436: <p>
1.302 markus 437: <ul>
1.317 millert 438: <li><a href="errata36.html#libz2">Jul 21, 2005:
439: Fix another buffer overflow in the zlib library that may be exploitable.</a>
1.316 millert 440: <li><a href="errata36.html#libz">Jul 6, 2005:
441: Fix a buffer overflow in the zlib library that may be exploitable.</a>
1.315 millert 442: <li><a href="errata36.html#sudo">Jun 20, 2005:
1.316 millert 443: Fix a race condition in sudo(8) that could allow a user
1.315 millert 444: to run arbitrary commands.</a>
1.311 deraadt 445: <li><a href="errata36.html#cvs">Apr 28, 2005:
1.310 brad 446: Fix a buffer overflow, memory leaks, and NULL pointer
447: dereference in cvs(1).</a>
1.311 deraadt 448: <li><a href="errata36.html#telnet">Mar 30, 2005:
1.309 brad 449: Due to buffer overflows in telnet(1), a malicious
450: server or man-in-the-middle attack could allow
451: execution of arbitrary code with the privileges of
452: the user invoking telnet(1).</a>
1.311 deraadt 453: <li><a href="errata36.html#copy">Mar 16, 2005:
1.307 brad 454: More stringent checking should be done in the copy(9)
455: functions to prevent their misuse.</a>
1.311 deraadt 456: <li><a href="errata36.html#locore">Feb 28, 2005:
1.306 brad 457: More stringent checking should be done in the copy(9)
458: functions to prevent their misuse.</a>
1.311 deraadt 459: <li><a href="errata36.html#httpd">Jan 12, 2005:
1.304 brad 460: httpd(8)'s mod_include module fails to properly validate
461: the length of user supplied tag strings prior to copying
1.305 brad 462: them to a local buffer, causing a buffer overflow.</a>
1.311 deraadt 463: <li><a href="errata36.html#pfkey">Dec 14, 2004:
1.302 markus 464: On systems running isakmpd(8) it is possible for a local
465: user to cause kernel memory corruption and system panic by
1.303 markus 466: setting ipsec(4) credentials on a socket.</a>
1.302 markus 467: </ul>
1.301 miod 468:
469: <li>
1.288 matthieu 470: <a name="35"></a>
1.279 deraadt 471:
1.294 david 472: <h3><font color="#e00000">OpenBSD 3.5 Security Advisories</font></h3>
1.279 deraadt 473: These are the OpenBSD 3.5 advisories -- all these problems are solved
1.314 miod 474: in <a href="anoncvs.html">OpenBSD current</a>. The
475: <a href="stable.html">patch branch</a> for 3.5 is no longer being maintained,
476: you should update your machine.
1.279 deraadt 477:
478: <p>
479: <ul>
1.310 brad 480: <li><a href="errata35.html#cvs4">Apr 28, 2005:
481: Fix a buffer overflow, memory leaks, and NULL pointer
482: dereference in cvs(1).</a>
1.309 brad 483: <li><a href="errata35.html#telnet">Mar 30, 2005:
484: Due to buffer overflows in telnet(1), a malicious
485: server or man-in-the-middle attack could allow
486: execution of arbitrary code with the privileges of
487: the user invoking telnet(1).</a>
1.308 brad 488: <li><a href="errata35.html#copy">Mar 16, 2005:
1.307 brad 489: More stringent checking should be done in the copy(9)
490: functions to prevent their misuse.</a>
1.306 brad 491: <li><a href="errata35.html#locore">Feb 28, 2005:
492: More stringent checking should be done in the copy(9)
493: functions to prevent their misuse.</a>
1.304 brad 494: <li><a href="errata35.html#httpd3">Jan 12, 2005:
495: httpd(8)'s mod_include module fails to properly validate
496: the length of user supplied tag strings prior to copying
1.305 brad 497: them to a local buffer, causing a buffer overflow.</a>
1.302 markus 498: <li><a href="errata35.html#pfkey">Dec 14, 2004:
499: On systems running isakmpd(8) it is possible for a local
500: user to cause kernel memory corruption and system panic by
1.303 markus 501: setting ipsec(4) credentials on a socket.</a>
1.301 miod 502: <li><a href="errata35.html#radius">Sep 20, 2004:
1.299 millert 503: Radius-based authentication is vulnerable to spoofed replies.</a>
1.301 miod 504: <li><a href="errata35.html#xpm">Sep 16, 2004:
1.298 brad 505: The Xpm library has vulnerabilities when parsing malicious images.</a>
1.301 miod 506: <li><a href="errata35.html#httpd2"> Sep 10, 2004:
1.297 brad 507: httpd(8)'s mod_rewrite module can be made to write one zero byte in
508: an arbitrary memory position outside of a char array, causing a DoS
509: or possibly buffer overflows.</a>
1.301 miod 510: <li><a href="errata35.html#httpd"> Jun 12, 2004:
1.300 deraadt 511: Multiple vulnerabilities have been found in httpd(8) / mod_ssl.</a>
1.301 miod 512: <li><a href="errata35.html#isakmpd"> Jun 10, 2004:
1.291 hshoexer 513: isakmpd(8) still has issues with unauthorized SA deletion,
1.293 brad 514: an attacker can delete IPsec tunnels at will.</a>
1.301 miod 515: <li><a href="errata35.html#cvs3"> Jun 9, 2004:
1.290 millert 516: Multiple remote vulnerabilities have been found in the cvs(1)
517: server which can be used by CVS clients to crash or execute
1.293 brad 518: arbitrary code on the server.</a>
1.301 miod 519: <li><a href="errata35.html#kerberos"> May 30, 2004:
1.289 beck 520: kdc(8) performs inadequate checking of request fields, leading
521: to the possibility of principal impersonation from other
522: Kerberos realms if they are trusted with a cross-realm trust.</a>
1.301 miod 523: <li><a href="errata35.html#xdm"> May 26, 2004:
1.287 matthieu 524: xdm(1) ignores the requestPort resource and creates a
1.293 brad 525: listening socket regardless of the setting in xdm-config.</a>
1.301 miod 526: <li><a href="errata35.html#cvs2"> May 20, 2004:
1.286 otto 527: A buffer overflow in the cvs(1) server has been found,
528: which can be used by CVS clients to execute arbitrary code on
1.293 brad 529: the server.</a>
1.301 miod 530: <li><a href="errata35.html#procfs"> May 13, 2004:
1.282 tedu 531: Integer overflow problems were found in procfs, allowing
1.293 brad 532: reading of arbitrary kernel memory.</a>
1.301 miod 533: <li><a href="errata35.html#cvs"> May 5, 2004:
1.281 otto 534: Pathname validation problems have been found in cvs(1),
535: allowing clients and servers access to files outside the
1.293 brad 536: repository or local CVS tree.</a>
1.279 deraadt 537: </ul>
538:
539: <p>
540: <li>
1.288 matthieu 541: <a name="34"></a>
1.261 david 542:
1.294 david 543: <h3><font color="#e00000">OpenBSD 3.4 Security Advisories</font></h3>
1.261 david 544: These are the OpenBSD 3.4 advisories -- all these problems are solved
1.301 miod 545: in <a href="anoncvs.html">OpenBSD current</a>. The
546: <a href="stable.html">patch branch</a> for 3.4 is no longer being maintained,
547: you should update your machine.
1.261 david 548: <p>
549: <ul>
1.302 markus 550: <li><a href="errata34.html#pfkey">Dec 14, 2004:
551: On systems running isakmpd(8) it is possible for a local
552: user to cause kernel memory corruption and system panic by
1.303 markus 553: setting ipsec(4) credentials on a socket.</a>
1.298 brad 554: <li><a href="errata34.html#xpm">Sep 16, 2004:
555: The Xpm library has vulnerabilities when parsing malicious images.</a>
1.297 brad 556: <li><a href="errata34.html#httpd4"> Sep 10, 2004:
557: httpd(8)'s mod_rewrite module can be made to write one zero byte in
558: an arbitrary memory position outside of a char array, causing a DoS
559: or possibly buffer overflows.</a>
1.294 david 560: <li><a href="errata34.html#httpd3"> Jun 12, 2004:
1.300 deraadt 561: Multiple vulnerabilities have been found in httpd(8) / mod_ssl.</a>
1.294 david 562: <li><a href="errata34.html#isakmpd3"> Jun 10, 2004:
1.292 brad 563: isakmpd(8) still has issues with unauthorized SA deletion,
1.293 brad 564: an attacker can delete IPsec tunnels at will.</a>
1.294 david 565: <li><a href="errata34.html#cvs3"> Jun 9, 2004:
1.290 millert 566: Multiple remote vulnerabilities have been found in the cvs(1)
567: server which can be used by CVS clients to crash or execute
1.293 brad 568: arbitrary code on the server.</a>
1.294 david 569: <li><a href="errata34.html#kerberos"> May 30, 2004:
1.289 beck 570: kdc(8) performs inadequate checking of request fields, leading
571: to the possibility of principal impersonation from other
572: Kerberos realms if they are trusted with a cross-realm trust.</a>
1.294 david 573: <li><a href="errata34.html#cvs2"> May 20, 2004:
1.286 otto 574: A buffer overflow in the cvs(1) server has been found,
575: which can be used by CVS clients to execute arbitrary code on
576: the server.</a>
1.294 david 577: <li><a href="errata34.html#procfs"> May 13, 2004:
1.282 tedu 578: Integer overflow problems were found in procfs, allowing
579: reading of arbitrary kernel memory.</a>
1.294 david 580: <li><a href="errata34.html#cvs"> May 5, 2004:
1.281 otto 581: Pathname validation problems have been found in cvs(1),
582: allowing clients and servers access to files outside the
583: repository or local CVS tree.</a>
1.294 david 584: <li><a href="errata34.html#openssl"> March 17, 2004:
1.277 millert 585: A missing check for a NULL-pointer dereference may allow a
1.281 otto 586: remote attacker to crash applications using OpenSSL.</a>
1.294 david 587: <li><a href="errata34.html#isakmpd2"> March 17, 2004:
1.276 brad 588: Defects in the payload validation and processing functions of
589: isakmpd have been discovered. An attacker could send malformed
590: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.294 david 591: <li><a href="errata34.html#httpd2"> March 13, 2004:
1.275 brad 592: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
593: access module, using IP addresses without a netmask on big endian
594: 64-bit platforms causes the rules to fail to match.</a>
1.294 david 595: <li><a href="errata34.html#ip6"> February 8, 2004:
1.272 dhartmei 596: An IPv6 MTU handling problem exists that could be used by an
597: attacker to cause a denial of service attack.</a>
1.294 david 598: <li><a href="errata34.html#sysvshm"> February 5, 2004:
1.271 millert 599: A reference counting bug in shmat(2) could be used to write to
600: kernel memory under certain circumstances.</a>
1.294 david 601: <li><a href="errata34.html#isakmpd">January 13, 2004:
1.266 brad 602: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 603: by Thomas Walpuski.</a>
1.294 david 604: <li><a href="errata34.html#ibcs2">November 17, 2003:
1.264 henning 605: It may be possible for a local user to overrun the stack in
606: compat_ibcs2(8) and cause a kernel panic.</a>
1.294 david 607: <li><a href="errata34.html#asn1">November 1, 2003:
1.262 margarid 608: The use of certain ASN.1 encodings or malformed public keys may
609: allow an attacker to mount a denial of service attack against
610: applications linked with ssl(3).</a>
1.261 david 611: </ul>
612:
613: <li>
1.288 matthieu 614: <a name="33"></a>
1.246 deraadt 615:
1.294 david 616: <h3><font color="#e00000">OpenBSD 3.3 Security Advisories</font></h3>
1.246 deraadt 617: These are the OpenBSD 3.3 advisories -- all these problems are solved
1.294 david 618: in <a href="anoncvs.html">OpenBSD current</a>. The
619: <a href="stable.html">patch branch</a> for 3.3 is no longer being maintained,
1.284 otto 620: you should update your machine.
1.246 deraadt 621: <p>
622: <ul>
1.294 david 623: <li><a href="errata33.html#cvs"> May 5, 2004:
1.281 otto 624: Pathname validation problems have been found in cvs(1),
625: allowing clients and servers access to files outside the
626: repository or local CVS tree.</a>
1.294 david 627: <li><a href="errata33.html#openssl"> March 17, 2004:
1.277 millert 628: A missing check for a NULL-pointer dereference may allow a
1.281 otto 629: remote attacker to crash applications using OpenSSL.</a>
1.294 david 630: <li><a href="errata33.html#isakmpd2"> March 17, 2004:
1.276 brad 631: Defects in the payload validation and processing functions of
632: isakmpd have been discovered. An attacker could send malformed
633: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.294 david 634: <li><a href="errata33.html#httpd2"> March 13, 2004:
1.275 brad 635: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
636: access module, using IP addresses without a netmask on big endian
637: 64-bit platforms causes the rules to fail to match.</a>
1.294 david 638: <li><a href="errata33.html#ip6"> February 8, 2004:
1.275 brad 639: An IPv6 MTU handling problem exists that could be used by an
640: attacker to cause a denial of service attack.</a>
1.294 david 641: <li><a href="errata33.html#sysvshm"> February 5, 2004:
1.271 millert 642: A reference counting bug in shmat(2) could be used to write to
643: kernel memory under certain circumstances.</a>
1.294 david 644: <li><a href="errata33.html#isakmpd">January 15, 2004:
1.268 brad 645: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 646: by Thomas Walpuski.</a>
1.294 david 647: <li><a href="errata33.html#ibcs2">November 17, 2003:
1.264 henning 648: It may be possible for a local user to execute arbitrary code
649: resulting in escalation of privileges due to a stack overrun
650: in compat_ibcs2(8).</a>
1.294 david 651: <li><a href="errata33.html#asn1">October 1, 2003:
1.257 millert 652: The use of certain ASN.1 encodings or malformed public keys may
653: allow an attacker to mount a denial of service attack against
654: applications linked with ssl(3).</a>
1.294 david 655: <li><a href="errata33.html#pfnorm">September 24, 2003:
1.258 beck 656: Access of freed memory in pf(4) could be used to
1.260 margarid 657: remotely panic a machine using scrub rules.</a>
1.294 david 658: <li><a href="errata33.html#sendmail">September 17, 2003:
1.256 millert 659: A buffer overflow in the address parsing in
660: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 661: <li><a href="errata33.html#sshbuffer">September 16, 2003:
1.255 millert 662: OpenSSH versions prior to 3.7 contains a buffer management error
663: that is potentially exploitable.</a>
1.294 david 664: <li><a href="errata33.html#sysvsem">September 10, 2003:
1.254 millert 665: Root may be able to reduce the security level by taking advantage of
666: an integer overflow when the semaphore limits are made very large.</a>
1.294 david 667: <li><a href="errata33.html#semget">August 20, 2003:
1.252 millert 668: An improper bounds check in the kernel may allow a local user
669: to panic the kernel.</a>
1.294 david 670: <li><a href="errata33.html#realpath">August 4, 2003:
1.249 millert 671: An off-by-one error exists in the C library function realpath(3)
672: may allow an attacker to gain escalated privileges.</a>
1.246 deraadt 673: </ul>
674:
1.265 miod 675:
1.247 david 676: <p>
1.246 deraadt 677: <li>
1.288 matthieu 678: <a name="32"></a>
1.224 deraadt 679:
1.294 david 680: <h3><font color="#e00000">OpenBSD 3.2 Security Advisories</font></h3>
1.224 deraadt 681: These are the OpenBSD 3.2 advisories -- all these problems are solved
1.294 david 682: in <a href="anoncvs.html">OpenBSD current</a>. The
683: <a href="stable.html">patch branch</a> for 3.2 is no longer being maintained,
1.265 miod 684: you should update your machine.
1.224 deraadt 685: <p>
686: <ul>
1.294 david 687: <li><a href="errata32.html#asn1">October 1, 2003:
1.257 millert 688: The use of certain ASN.1 encodings or malformed public keys may
689: allow an attacker to mount a denial of service attack against
690: applications linked with ssl(3). This does not affect OpenSSH.</a>
1.294 david 691: <li><a href="errata32.html#pfnorm">September 24, 2003:
1.258 beck 692: Access of freed memory in pf(4) could be used to
1.260 margarid 693: remotely panic a machine using scrub rules.</a>
1.294 david 694: <li><a href="errata32.html#sendmail4">September 17, 2003:
1.256 millert 695: A buffer overflow in the address parsing in
696: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 697: <li><a href="errata32.html#sshbuffer">September 16, 2003:
1.255 millert 698: OpenSSH versions prior to 3.7 contains a buffer management error
699: that is potentially exploitable.</a>
1.294 david 700: <li><a href="errata32.html#sendmail3">August 25, 2003:
1.253 brad 701: Fix for a potential security issue in
702: sendmail(8) with respect to DNS maps.</a>
1.294 david 703: <li><a href="errata32.html#realpath">August 4, 2003:
1.249 millert 704: An off-by-one error exists in the C library function realpath(3)
705: may allow an attacker to gain escalated privileges.</a>
1.294 david 706: <li><a href="errata32.html#sendmail2">March 31, 2003:
1.244 miod 707: A buffer overflow in the address parsing in
708: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 709: <li><a href="errata32.html#kerberos">March 24, 2003:
1.242 millert 710: A cryptographic weaknesses in the Kerberos v4 protocol can be
711: exploited on Kerberos v5 as well.</a>
1.294 david 712: <li><a href="errata32.html#kpr">March 19, 2003:
1.241 jufi 713: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 714: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.294 david 715: <li><a href="errata32.html#blinding">March 18, 2003:
1.239 miod 716: Various SSL and TLS operations in OpenSSL are vulnerable to
717: timing attacks.</a>
1.294 david 718: <li><a href="errata32.html#lprm">March 5, 2003:
1.238 millert 719: A buffer overflow in lprm(1) may allow an attacker to elevate
720: privileges to user daemon.</a>.
1.294 david 721: <li><a href="errata32.html#sendmail">March 3, 2003:
1.237 miod 722: A buffer overflow in the envelope comments processing in
723: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 724: <li><a href="errata32.html#httpd">February 25, 2003:
1.236 margarid 725: httpd(8) leaks file inode numbers via ETag header as well as
726: child PIDs in multipart MIME boundary generation. This could
727: lead, for example, to NFS exploitation because it uses inode
728: numbers as part of the file handle.</a>
1.294 david 729: <li><a href="errata32.html#ssl">February 22, 2003:
1.234 margarid 730: In ssl(8) an information leak can occur via timing by performing
731: a MAC computation even if incorrect block cipher padding has
732: been found, this is a countermeasure. Also, check for negative
733: sizes, in allocation routines.</a>
1.294 david 734: <li><a href="errata32.html#cvs">January 20, 2003:
1.232 millert 735: A double free exists in cvs(1) that could lead to privilege
736: escalation for cvs configurations where the cvs command is
1.233 margarid 737: run as a privileged user.</a>
1.294 david 738: <li><a href="errata32.html#named">November 14, 2002:
1.230 millert 739: A buffer overflow exists in named(8) that could lead to a
740: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 741: <li><a href="errata32.html#pool">November 6, 2002:
1.233 margarid 742: A logic error in the pool kernel memory allocator could cause
743: memory corruption in low-memory situations, causing the system
744: to crash.</a>
1.294 david 745: <li><a href="errata32.html#smrsh">November 6, 2002:
1.229 miod 746: An attacker can bypass smrsh(8)'s restrictions and execute
747: arbitrary commands with the privileges of his own account.</a>
1.294 david 748: <li><a href="errata32.html#pfbridge">November 6, 2002:
1.233 margarid 749: Network bridges running pf with scrubbing enabled could cause
750: mbuf corruption, causing the system to crash.</a>
1.294 david 751: <li><a href="errata32.html#kadmin">October 21, 2002:
1.228 miod 752: A buffer overflow can occur in the kadmind(8) daemon, leading
753: to possible remote crash or exploit.</a>
1.224 deraadt 754: </ul>
755:
1.227 miod 756: <p>
757: <li>
1.288 matthieu 758: <a name="31"></a>
1.203 deraadt 759:
1.294 david 760: <h3><font color="#e00000">OpenBSD 3.1 Security Advisories</font></h3>
1.203 deraadt 761: These are the OpenBSD 3.1 advisories -- all these problems are solved
1.294 david 762: in <a href="anoncvs.html">OpenBSD current</a>. The
763: <a href="stable.html">patch branch</a> for 3.1 is no longer being maintained,
1.258 beck 764: you should update your machine.
1.203 deraadt 765:
766: <p>
767: <ul>
1.294 david 768: <li><a href="errata31.html#sendmail2">March 31, 2003:
1.244 miod 769: A buffer overflow in the address parsing in
770: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 771: <li><a href="errata31.html#kerberos">March 24, 2003:
1.242 millert 772: A cryptographic weaknesses in the Kerberos v4 protocol can be
773: exploited on Kerberos v5 as well.</a>
1.294 david 774: <li><a href="errata31.html#kpr">March 19, 2003:
1.241 jufi 775: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 776: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.294 david 777: <li><a href="errata31.html#blinding">March 18, 2003:
1.239 miod 778: Various SSL and TLS operations in OpenSSL are vulnerable to
779: timing attacks.</a>
1.294 david 780: <li><a href="errata31.html#lprm">March 4, 2003:
1.238 millert 781: A buffer overflow in lprm(1) may allow an attacker to gain
782: root privileges.</a>
1.294 david 783: <li><a href="errata31.html#sendmail">March 3, 2003:
1.237 miod 784: A buffer overflow in the envelope comments processing in
785: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 786: <li><a href="errata31.html#ssl2">February 23, 2003:
1.235 miod 787: In ssl(8) an information leak can occur via timing by performing
788: a MAC computation even if incorrect block cipher padding has
789: been found, this is a countermeasure. Also, check for negative
790: sizes, in allocation routines.</a>
1.294 david 791: <li><a href="errata31.html#cvs">January 20, 2003:
1.232 millert 792: A double free exists in cvs(1) that could lead to privilege
793: escalation for cvs configurations where the cvs command is
1.294 david 794: run as a privileged user</a>.
795: <li><a href="errata31.html#named">November 14, 2002:
1.230 millert 796: A buffer overflow exists in named(8) that could lead to a
797: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 798: <li><a href="errata31.html#kernresource">November 6, 2002:
1.229 miod 799: Incorrect argument checking in the getitimer(2) system call
800: may allow an attacker to crash the system.</a>
1.294 david 801: <li><a href="errata31.html#smrsh">November 6, 2002:
1.229 miod 802: An attacker can bypass smrsh(8)'s restrictions and execute
803: arbitrary commands with the privileges of his own account.</a>
1.294 david 804: <li><a href="errata31.html#kadmin">October 21, 2002:
1.226 miod 805: A buffer overflow can occur in the kadmind(8) daemon, leading
806: to possible remote crash or exploit.</a>
1.294 david 807: <li><a href="errata31.html#kerntime">October 2, 2002:
1.222 jason 808: Incorrect argument checking in the setitimer(2) system call
809: may allow an attacker to write to kernel memory.</a>
1.294 david 810: <li><a href="errata31.html#scarg">August 11, 2002:
1.221 provos 811: An insufficient boundary check in the select system call
1.220 miod 812: allows an attacker to overwrite kernel memory and execute arbitrary code
813: in kernel context.</a>
1.294 david 814: <li><a href="errata31.html#ssl">July 30, 2002:
1.218 miod 815: Several remote buffer overflows can occur in the SSL2 server and SSL3
816: client of the ssl(8) library, as in the ASN.1 parser code in the
817: crypto(3) library, all of them being potentially remotely
818: exploitable.</a>
1.294 david 819: <li><a href="errata31.html#xdr">July 29, 2002:
1.218 miod 820: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
821: possible remote crash.</a>
1.294 david 822: <li><a href="errata31.html#pppd">July 29, 2002:
1.218 miod 823: A race condition exists in the pppd(8) daemon which may cause it to
824: alter the file permissions of an arbitrary file.</a>
1.294 david 825: <li><a href="errata31.html#isakmpd">July 5, 2002:
1.218 miod 826: Receiving IKE payloads out of sequence can cause isakmpd(8) to
827: crash.</a>
1.294 david 828: <li><a href="errata31.html#ktrace">June 27, 2002:
1.215 miod 829: The kernel would let any user ktrace set[ug]id processes.</a>
1.294 david 830: <li><a href="errata31.html#modssl">June 26, 2002:
1.213 miod 831: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 832: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.294 david 833: <li><a href="errata31.html#resolver">June 25, 2002:
1.212 millert 834: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 835: <li><a href="errata31.html#sshd">June 24, 2002:
1.216 deraadt 836: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 837: input validation error that can result in an integer overflow and
838: privilege escalation.</a>
1.294 david 839: <li><a href="errata31.html#httpd">June 19, 2002:
1.211 miod 840: A buffer overflow can occur during the interpretation of chunked
841: encoding in httpd(8), leading to possible remote crash.</a>
1.294 david 842: <li><a href="errata31.html#sshbsdauth">May 22, 2002:
1.209 markus 843: Under certain conditions, on systems using YP with netgroups
844: in the password database, it is possible that sshd(8) does
845: ACL checks for the requested user name but uses the password
846: database entry of a different user for authentication. This
847: means that denied users might authenticate successfully
848: while permitted users could be locked out.</a>
1.294 david 849: <li><a href="errata31.html#fdalloc2">May 8, 2002:
1.208 millert 850: A race condition exists that could defeat the kernel's
851: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 852: <li><a href="errata31.html#sudo">April 25, 2002:
1.205 millert 853: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 854: <li><a href="errata31.html#sshafs">April 22, 2002:
1.205 millert 855: A local user can gain super-user privileges due to a buffer
856: overflow in sshd(8) if AFS has been configured on the system
857: or if KerberosTgtPassing or AFSTokenPassing has been enabled
858: in the sshd_config file.</a>
1.203 deraadt 859: </ul>
860:
1.235 miod 861: <p>
1.203 deraadt 862: <li>
1.288 matthieu 863: <a name="30"></a>
1.187 deraadt 864:
1.294 david 865: <h3><font color="#e00000">OpenBSD 3.0 Security Advisories</font></h3>
1.187 deraadt 866: These are the OpenBSD 3.0 advisories -- all these problems are solved
1.294 david 867: in <a href="anoncvs.html">OpenBSD current</a>. The
868: <a href="stable.html">patch branch</a> for 3.0 is no longer being maintained,
1.258 beck 869: you should update your machine.
1.187 deraadt 870:
871: <p>
872: <ul>
1.294 david 873: <li><a href="errata30.html#named">November 14, 2002:
1.230 millert 874: A buffer overflow exists in named(8) that could lead to a
875: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 876: <li><a href="errata30.html#kernresource">November 6, 2002:
1.229 miod 877: Incorrect argument checking in the getitimer(2) system call
878: may allow an attacker to crash the system.</a>
1.294 david 879: <li><a href="errata30.html#smrsh">November 6, 2002:
1.229 miod 880: An attacker can bypass smrsh(8)'s restrictions and execute
881: arbitrary commands with the privileges of his own account.</a>
1.294 david 882: <li><a href="errata30.html#kadmin">October 21, 2002:
1.226 miod 883: A buffer overflow can occur in the kadmind(8) daemon, leading
884: to possible remote crash or exploit.</a>
1.294 david 885: <li><a href="errata30.html#kerntime">October 7, 2002:
1.223 miod 886: Incorrect argument checking in the setitimer(2) system call
887: may allow an attacker to write to kernel memory.</a>
1.294 david 888: <li><a href="errata30.html#scarg">August 11, 2002:
1.220 miod 889: An insufficient boundary check in the select and poll system calls
890: allows an attacker to overwrite kernel memory and execute arbitrary code
891: in kernel context.</a>
1.294 david 892: <li><a href="errata30.html#ssl">July 30, 2002:
1.218 miod 893: Several remote buffer overflows can occur in the SSL2 server and SSL3
894: client of the ssl(8) library, as in the ASN.1 parser code in the
895: crypto(3) library, all of them being potentially remotely
896: exploitable.</a>
1.294 david 897: <li><a href="errata30.html#xdr">July 29, 2002:
1.218 miod 898: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
899: possible remote crash.</a>
1.294 david 900: <li><a href="errata30.html#pppd">July 29, 2002:
1.218 miod 901: A race condition exists in the pppd(8) daemon which may cause it to
902: alter the file permissions of an arbitrary file.</a>
1.294 david 903: <li><a href="errata30.html#isakmpd2">July 5, 2002:
1.218 miod 904: Receiving IKE payloads out of sequence can cause isakmpd(8) to
905: crash.</a>
1.294 david 906: <li><a href="errata30.html#ktrace">June 27, 2002:
1.215 miod 907: The kernel would let any user ktrace set[ug]id processes.</a>
1.294 david 908: <li><a href="errata30.html#resolver">June 25, 2002:
1.212 millert 909: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 910: <li><a href="errata30.html#sshdauth">June 24, 2002:
1.216 deraadt 911: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 912: input validation error that can result in an integer overflow and
913: privilege escalation.</a>
1.294 david 914: <li><a href="errata30.html#modssl">June 24, 2002:
1.213 miod 915: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 916: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.294 david 917: <li><a href="errata30.html#httpd">June 19, 2002:
1.213 miod 918: A buffer overflow can occur during the interpretation of chunked
919: encoding in httpd(8), leading to possible remote crash.</a>
1.294 david 920: <li><a href="errata30.html#fdalloc2">May 8, 2002:
1.208 millert 921: A race condition exists that could defeat the kernel's
922: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 923: <li><a href="errata30.html#sudo2">April 25, 2002:
1.205 millert 924: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 925: <li><a href="errata30.html#sshafs">April 22, 2002:
1.205 millert 926: A local user can gain super-user privileges due to a buffer
927: overflow in sshd(8) if AFS has been configured on the system
928: or if KerberosTgtPassing or AFSTokenPassing has been enabled
929: in the sshd_config file.</a>
1.294 david 930: <li><a href="errata30.html#mail">April 11, 2002:
1.202 millert 931: The mail(1) was interpreting tilde escapes even when invoked
932: in non-interactive mode. As mail(1) is called as root from cron,
933: this can lead to a local root compromise.</a>
1.294 david 934: <li><a href="errata30.html#approval">March 19, 2002:
1.201 millert 935: Under certain conditions, on systems using YP with netgroups in
936: the password database, it is possible for the rexecd(8) and rshd(8)
937: daemons to execute a shell from a password database entry for a
938: different user. Similarly, atrun(8) may change to the wrong
939: home directory when running jobs.</a>
1.294 david 940: <li><a href="errata30.html#zlib">March 13, 2002:
1.200 millert 941: A potential double free() exists in the zlib library;
942: this is not exploitable on OpenBSD.
943: The kernel also contains a copy of zlib; it is not
944: currently known if the kernel zlib is exploitable.</a>
1.294 david 945: <li><a href="errata30.html#openssh">March 8, 2002:
1.198 millert 946: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 947: may allow a local user to gain super-user privileges.</a>
1.294 david 948: <li><a href="errata30.html#ptrace">January 21, 2002:
1.192 jason 949: A race condition between the ptrace(2) and execve(2) system calls
950: allows an attacker to modify the memory contents of suid/sgid
951: processes which could lead to compromise of the super-user account.</a>
1.294 david 952: <li><a href="errata30.html#sudo">January 17, 2002:
1.191 millert 953: There is a security hole in sudo(8) that can be exploited
954: when the Postfix sendmail replacement is installed that may
955: allow an attacker on the local host to gain root privileges.</a>
1.294 david 956: <li><a href="errata30.html#lpd">November 28, 2001:
1.189 millert 957: An attacker can trick a machine running the lpd daemon into
958: creating new files in the root directory from a machine with
959: remote line printer access.</a>
1.294 david 960: <li><a href="errata30.html#vi.recover">November 13, 2001:
1.188 millert 961: The vi.recover script can be abused in such a way as
962: to cause arbitrary zero-length files to be removed.</a>
1.294 david 963: <li><a href="errata30.html#pf">November 13, 2001:
1.190 mpech 964: pf(4) was incapable of dealing with certain ipv6 icmp packets,
965: resulting in a crash.</a>
1.294 david 966: <li><a href="errata30.html#sshd">November 12, 2001:
1.190 mpech 967: A security hole that may allow an attacker to partially authenticate
968: if -- and only if -- the administrator has enabled KerberosV.</a>
1.187 deraadt 969: </ul>
970:
971: <p>
972: <li>
1.288 matthieu 973: <a name="29"></a>
1.173 deraadt 974:
1.294 david 975: <h3><font color="#e00000">OpenBSD 2.9 Security Advisories</font></h3>
1.173 deraadt 976: These are the OpenBSD 2.9 advisories -- all these problems are solved
1.294 david 977: in <a href="anoncvs.html">OpenBSD current</a>. The
978: <a href="stable.html">patch branch</a>. for 2.9 is no longer being maintained,
1.258 beck 979: you should update your machine.
980:
1.173 deraadt 981:
982: <p>
983: <ul>
1.294 david 984: <li><a href="errata29.html#resolver">June 25, 2002:
1.212 millert 985: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 986: <li><a href="errata29.html#fdalloc2">May 8, 2002:
1.208 millert 987: A race condition exists that could defeat the kernel's
988: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 989: <li><a href="errata29.html#sudo2">April 25, 2002:
1.207 millert 990: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 991: <li><a href="errata29.html#sshafs">April 22, 2002:
1.206 millert 992: A local user can gain super-user privileges due to a buffer
993: overflow in sshd(8) if AFS has been configured on the system
994: or if KerberosTgtPassing or AFSTokenPassing has been enabled
995: in the sshd_config file.</a>
1.294 david 996: <li><a href="errata29.html#mail">April 11, 2002:
1.202 millert 997: The mail(1) was interpreting tilde escapes even when invoked
998: in non-interactive mode. As mail(1) is called as root from cron,
999: this can lead to a local root compromise.</a>
1.294 david 1000: <li><a href="errata29.html#zlib">March 13, 2002:
1.200 millert 1001: A potential double free() exists in the zlib library;
1002: this is not exploitable on OpenBSD.
1003: The kernel also contains a copy of zlib; it is not
1004: currently known if the kernel zlib is exploitable.</a>
1.294 david 1005: <li><a href="errata29.html#openssh">March 8, 2002:
1.198 millert 1006: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 1007: may allow a local user to gain super-user privileges.</a>
1.294 david 1008: <li><a href="errata29.html#ptrace">January 21, 2002:
1.198 millert 1009: A race condition between the ptrace(2) and execve(2) system calls
1010: allows an attacker to modify the memory contents of suid/sgid
1011: processes which could lead to compromise of the super-user account.</a>
1.294 david 1012: <li><a href="errata29.html#sudo">January 17, 2002:
1.191 millert 1013: There is a security hole in sudo(8) that can be exploited
1014: when the Postfix sendmail replacement is installed that may
1015: allow an attacker on the local host to gain root privileges.</a>
1.294 david 1016: <li><a href="errata29.html#lpd2">November 28, 2001:
1.189 millert 1017: An attacker can trick a machine running the lpd daemon into
1018: creating new files in the root directory from a machine with
1019: remote line printer access.</a>
1.294 david 1020: <li><a href="errata29.html#vi.recover">November 13, 2001:
1.190 mpech 1021: The vi.recover script can be abused in such a way as
1022: to cause arbitrary zero-length files to be removed.</a>
1.294 david 1023: <li><a href="errata29.html#uucp">September 11, 2001:
1.184 millert 1024: A security hole exists in uuxqt(8) that may allow an
1025: attacker to gain root privileges.</a>
1.294 david 1026: <li><a href="errata29.html#lpd">August 29, 2001:
1.183 millert 1027: A security hole exists in lpd(8) that may allow an
1028: attacker to gain root privileges if lpd is running.</a>
1.294 david 1029: <li><a href="errata29.html#sendmail2">August 21, 2001:
1.181 millert 1030: A security hole exists in sendmail(8) that may allow an
1031: attacker on the local host to gain root privileges.</a>
1.294 david 1032: <li><a href="errata29.html#nfs">July 30, 2001:
1.180 jason 1033: A kernel buffer overflow in the NFS code can be used to execute
1034: arbitrary code by users with mount privileges (only root by
1.181 millert 1035: default).</a>
1.294 david 1036: <li><a href="errata29.html#kernexec">June 15, 2001:
1.178 aaron 1037: A race condition in the kernel can lead to local root compromise.</a>
1.294 david 1038: <li><a href="errata29.html#sshcookie">June 12, 2001:
1.177 markus 1039: sshd(8) allows users to delete arbitrary files named "cookies"
1040: if X11 forwarding is enabled. X11 forwarding is disabled
1041: by default.</a>
1.294 david 1042: <li><a href="errata29.html#fts">May 30, 2001:
1.176 millert 1043: Programs using the fts routines can be tricked into changing
1044: into the wrong directory.</a>
1.294 david 1045: <li><a href="errata29.html#sendmail">May 29, 2001:
1.174 millert 1046: Sendmail signal handlers contain unsafe code,
1047: leading to numerous race conditions.</a>
1.173 deraadt 1048: </ul>
1049:
1050: <p>
1051: <li>
1.288 matthieu 1052: <a name="28"></a>
1.152 deraadt 1053:
1.294 david 1054: <h3><font color="#e00000">OpenBSD 2.8 Security Advisories</font></h3>
1.152 deraadt 1055: These are the OpenBSD 2.8 advisories -- all these problems are solved
1.294 david 1056: in <a href="anoncvs.html">OpenBSD current</a>. The
1057: <a href="stable.html">patch branch</a>. for 2.8 is no longer being maintained,
1.258 beck 1058: you should update your machine.
1059:
1.152 deraadt 1060:
1061: <p>
1062: <ul>
1.294 david 1063: <li><a href="errata28.html#uucp">September 11, 2001:
1.184 millert 1064: A security hole exists in uuxqt(8) that may allow an
1065: attacker to gain root privileges.</a>
1.294 david 1066: <li><a href="errata28.html#lpd">August 29, 2001:
1.183 millert 1067: A security hole exists in lpd(8) that may allow an
1068: attacker to gain root privileges if lpd is running.</a>
1.294 david 1069: <li><a href="errata28.html#sendmail2">August 21, 2001:
1.181 millert 1070: A security hole exists in sendmail(8) that may allow an
1071: attacker on the local host to gain root privileges.</a>
1.294 david 1072: <li><a href="errata28.html#kernexec">June 15, 2001:
1.178 aaron 1073: A race condition in the kernel can lead to local root compromise.</a>
1.294 david 1074: <li><a href="errata28.html#fts">May 30, 2001:
1.176 millert 1075: Programs using the fts routines can be tricked into changing
1076: into the wrong directory.</a>
1.294 david 1077: <li><a href="errata28.html#sendmail">May 29, 2001:
1.175 millert 1078: Sendmail signal handlers contain unsafe code,
1079: leading to numerous race conditions.</a>
1.294 david 1080: <li><a href="errata28.html#ipf_frag">Apr 23, 2001:
1.231 mickey 1081: IPF contains a serious bug with its handling of fragment caching.</a>
1.294 david 1082: <li><a href="errata28.html#glob_limit">Apr 23, 2001:
1.172 ericj 1083: ftpd(8) contains a potential DoS relating to glob(3).</a>
1.294 david 1084: <li><a href="errata28.html#glob">Apr 10, 2001:
1.170 ericj 1085: The glob(3) library call contains multiple buffer overflows.</a>
1.294 david 1086: <li><a href="errata28.html#readline">Mar 18, 2001:
1.169 millert 1087: The readline library creates history files with permissive modes based on the user's umask.</a>
1.294 david 1088: <li><a href="errata28.html#ipsec_ah">Mar 2, 2001:
1.167 ericj 1089: Insufficient checks in the IPSEC AH IPv4 option handling code can lead to a buffer overrun in the kernel.</a>
1.294 david 1090: <li><a href="errata28.html#userldt">Mar 2, 2001:
1.168 horacio 1091: The <b>USER_LDT</b> kernel option allows an attacker to gain access to privileged areas of kernel memory.</a>
1.294 david 1092: <li><a href="errata28.html#sudo">Feb 22, 2001:
1.171 millert 1093: a non-exploitable buffer overflow was fixed in sudo(8).</a>
1.294 david 1094: <li><a href="errata28.html#named">Jan 29, 2001:
1.163 jason 1095: merge named(8) with ISC BIND 4.9.8-REL, which fixes some buffer vulnerabilities.</a>
1.294 david 1096: <li><a href="errata28.html#rnd">Jan 22, 2001:
1.162 jason 1097: rnd(4) did not use all of its input when written to.</a>
1.294 david 1098: <li><a href="errata28.html#xlock">Dec 22, 2000:
1.159 ericj 1099: xlock(1)'s authentication was re-done to authenticate via a named pipe. (patch and new xlock binaries included).</a>
1.294 david 1100: <li><a href="errata28.html#procfs">Dec 18, 2000:
1.157 ericj 1101: Procfs contains numerous overflows. Procfs is not used by default in OpenBSD. (patch included).</a>
1.294 david 1102: <li><a href="errata28.html#kerberos2">Dec 10, 2000:
1.156 deraadt 1103: Another problem exists in KerberosIV libraries (patch included).</a>
1.294 david 1104: <li><a href="errata28.html#kerberos">Dec 7, 2000:
1.155 deraadt 1105: A set of problems in KerberosIV exist (patch included).</a>
1.294 david 1106: <li><a href="errata28.html#ftpd">Dec 4, 2000:
1.154 millert 1107: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.152 deraadt 1108: </ul>
1109:
1110: <p>
1111: <li>
1.288 matthieu 1112: <a name="27"></a>
1.124 deraadt 1113:
1.294 david 1114: <h3><font color="#e00000">OpenBSD 2.7 Security Advisories</font></h3>
1.124 deraadt 1115: These are the OpenBSD 2.7 advisories -- all these problems are solved
1.294 david 1116: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.124 deraadt 1117: OpenBSD 2.6 advisories listed below are fixed in OpenBSD 2.7.
1118:
1119: <p>
1120: <ul>
1.294 david 1121: <li><a href="errata27.html#readline">Mar 18, 2001:
1.169 millert 1122: The readline library creates history files with permissive modes based on the user's umask.</a>
1.294 david 1123: <li><a href="errata27.html#sudo">Feb 22, 2001:
1.169 millert 1124: a buffer overflow was fixed in sudo(8).</a>
1.294 david 1125: <li><a href="errata27.html#ftpd">Dec 4, 2000:
1.154 millert 1126: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.294 david 1127: <li><a href="errata27.html#sshforwarding">Nov 10, 2000:
1.152 deraadt 1128: Hostile servers can force OpenSSH clients to do agent or X11 forwarding.
1129: (patch included)</a>
1.294 david 1130: <li><a href="errata27.html#xtrans">Oct 26, 2000:
1.151 matthieu 1131: X11 libraries have 2 potential overflows in xtrans code.
1132: (patch included)</a>
1.294 david 1133: <li><a href="errata27.html#httpd">Oct 18, 2000:
1.150 beck 1134: Apache mod_rewrite and mod_vhost_alias modules could expose files
1135: on the server in certain configurations if used.
1136: (patch included)</a>
1.294 david 1137: <li><a href="errata27.html#telnetd">Oct 10, 2000:
1.149 millert 1138: The telnet daemon does not strip out the TERMINFO, TERMINFO_DIRS,
1139: TERMPATH and TERMCAP environment variables as it should.
1140: (patch included)</a>
1.294 david 1141: <li><a href="errata27.html#format_strings">Oct 6, 2000:
1.148 millert 1142: There are printf-style format string bugs in several privileged
1143: programs. (patch included)</a>
1.294 david 1144: <li><a href="errata27.html#curses">Oct 6, 2000:
1.147 millert 1145: libcurses honored terminal descriptions in the $HOME/.terminfo
1146: directory as well as in the TERMCAP environment variable for
1147: setuid and setgid applications.
1.146 deraadt 1148: (patch included)</a>
1.294 david 1149: <li><a href="errata27.html#talkd">Oct 6, 2000:
1.146 deraadt 1150: A format string vulnerability exists in talkd(8).
1151: (patch included)</a>
1.294 david 1152: <li><a href="errata27.html#pw_error">Oct 3, 2000:
1.145 aaron 1153: A format string vulnerability exists in the pw_error() function of the
1154: libutil library, yielding localhost root through chpass(1).
1155: (patch included)</a>
1.294 david 1156: <li><a href="errata27.html#ipsec">Sep 18, 2000:
1.144 jason 1157: Bad ESP/AH packets could cause a crash under certain conditions.
1158: (patch included)</a>
1.294 david 1159: <li><a href="errata27.html#xlock">Aug 16, 2000:
1.141 deraadt 1160: A format string vulnerability (localhost root) exists in xlock(1).
1161: (patch included)</a>
1.294 david 1162: <li><a href="errata27.html#X11_libs">July 14, 2000:
1.139 deraadt 1163: Various bugs found in X11 libraries have various side effects, almost
1164: completely denial of service in OpenBSD.
1165: (patch included)</a>
1.294 david 1166: <li><a href="errata27.html#ftpd">July 5, 2000:
1.136 deraadt 1167: Just like pretty much all the other unix ftp daemons
1168: on the planet, ftpd had a remote root hole in it.
1169: Luckily, ftpd was not enabled by default.
1.137 deraadt 1170: The problem exists if anonymous ftp is enabled.
1.136 deraadt 1171: (patch included)</a>
1.294 david 1172: <li><a href="errata27.html#mopd">July 5, 2000:
1.136 deraadt 1173: Mopd, very rarely used, contained some buffer overflows.
1174: (patch included)</a>
1.294 david 1175: <li><a href="errata27.html#libedit">June 28, 2000:
1.135 deraadt 1176: libedit would check for a <b>.editrc</b> file in the current
1177: directory. Not known to be a real security issue, but a patch
1178: is available anyways.
1179: (patch included)</a>
1.294 david 1180: <li><a href="errata27.html#dhclient">June 24, 2000:
1.134 deraadt 1181: A serious bug in dhclient(8) could allow strings from a
1182: malicious dhcp server to be executed in the shell as root.
1183: (patch included)</a>
1.294 david 1184: <li><a href="errata27.html#isakmpd">June 9, 2000:
1.133 deraadt 1185: A serious bug in isakmpd(8) policy handling wherein
1186: policy verification could be completely bypassed in isakmpd.
1187: (patch included)</a>
1.294 david 1188: <li><a href="errata27.html#uselogin">June 6, 2000:
1.132 deraadt 1189: The non-default flag UseLogin in <b>/etc/sshd_config</b> is broken,
1190: should not be used, and results in security problems on
1191: other operating systems.</a>
1.294 david 1192: <li><a href="errata27.html#bridge">May 26, 2000:
1.129 deraadt 1193: The bridge(4) <i>learning</i> flag may be bypassed.
1.128 deraadt 1194: (patch included)</a>
1.294 david 1195: <li><a href="errata27.html#ipf">May 25, 2000:
1.127 kjell 1196: Improper use of ipf <i>keep-state</i> rules can result
1197: in firewall rules being bypassed. (patch included)</a>
1198:
1.124 deraadt 1199: </ul>
1200:
1201: <p>
1202: <li>
1.288 matthieu 1203: <a name="26"></a>
1.119 deraadt 1204:
1.294 david 1205: <h3><font color="#e00000">OpenBSD 2.6 Security Advisories</font></h3>
1.119 deraadt 1206: These are the OpenBSD 2.6 advisories -- all these problems are solved
1.294 david 1207: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.119 deraadt 1208: OpenBSD 2.5 advisories listed below are fixed in OpenBSD 2.6.
1209:
1210: <p>
1211: <ul>
1.294 david 1212: <li><a href="errata26.html#semconfig">May 26, 2000:
1.130 deraadt 1213: SYSV semaphore support contained an undocumented system call
1.131 deraadt 1214: which could wedge semaphore-using processes from exiting. (patch included)</a>
1.294 david 1215: <li><a href="errata26.html#ipf">May 25, 2000:
1.127 kjell 1216: Improper use of ipf <i>keep-state</i> rules can result
1217: in firewall rules being bypassed. (patch included)</a>
1.294 david 1218: <li><a href="errata26.html#xlockmore">May 25, 2000:
1.125 deraadt 1219: xlockmore has a bug which a localhost attacker can use to gain
1220: access to the encrypted root password hash (which is normally
1.245 miod 1221: encoded using blowfish</a> (see
1.294 david 1222: <a href="http://www.openbsd.org/cgi-bin/man.cgi?query=crypt&sektion=3">
1.125 deraadt 1223: crypt(3)</a>)
1.245 miod 1224: (patch included).
1.294 david 1225: <li><a href="errata26.html#procfs">Jan 20, 2000:
1.123 deraadt 1226: Systems running with procfs enabled and mounted are
1227: vulnerable to a very tricky exploit. procfs is not
1228: mounted by default.
1229: (patch included).</a>
1.294 david 1230: <li><a href="errata26.html#sendmail">Dec 4, 1999:
1.296 david 1231: Sendmail permitted any user to cause an aliases file wrap,
1.190 mpech 1232: thus exposing the system to a race where the aliases file
1233: did not exist.
1.119 deraadt 1234: (patch included).</a>
1.294 david 1235: <li><a href="errata26.html#poll">Dec 4, 1999:
1.190 mpech 1236: Various bugs in poll(2) may cause a kernel crash.</a>
1.294 david 1237: <li><a href="errata26.html#sslUSA">Dec 2, 1999:
1.120 deraadt 1238: A buffer overflow in the RSAREF code included in the
1239: USA version of libssl, is possibly exploitable in
1240: httpd, ssh, or isakmpd, if SSL/RSA features are enabled.
1.124 deraadt 1241: (patch included).<br></a>
1242: <strong>Update:</strong> Turns out that this was not exploitable
1243: in any of the software included in OpenBSD 2.6.
1.294 david 1244: <li><a href="errata26.html#ifmedia">Nov 9, 1999:
1.190 mpech 1245: Any user could change interface media configurations, resulting in
1246: a localhost denial of service attack.
1.121 deraadt 1247: (patch included).</a>
1.119 deraadt 1248: </ul>
1249:
1250: <p>
1251: <li>
1.288 matthieu 1252: <a name="25"></a>
1.106 deraadt 1253:
1.294 david 1254: <h3><font color="#e00000">OpenBSD 2.5 Security Advisories</font></h3>
1.93 deraadt 1255: These are the OpenBSD 2.5 advisories -- all these problems are solved
1.294 david 1256: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.93 deraadt 1257: OpenBSD 2.4 advisories listed below are fixed in OpenBSD 2.5.
1258:
1.96 deraadt 1259: <p>
1.104 deraadt 1260: <ul>
1.294 david 1261: <li><a href="errata25.html#cron">Aug 30, 1999:
1.103 deraadt 1262: In cron(8), make sure argv[] is NULL terminated in the
1263: fake popen() and run sendmail as the user, not as root.
1264: (patch included).</a>
1.294 david 1265: <li><a href="errata25.html#miscfs">Aug 12, 1999: The procfs and fdescfs
1.101 deraadt 1266: filesystems had an overrun in their handling of uio_offset
1267: in their readdir() routines. (These filesystems are not
1268: enabled by default). (patch included).</a>
1.294 david 1269: <li><a href="errata25.html#profil">Aug 9, 1999: Stop profiling (see profil(2))
1.100 deraadt 1270: when we execve() a new process. (patch included).</a>
1.294 david 1271: <li><a href="errata25.html#ipsec_in_use">Aug 6, 1999: Packets that should have
1.98 deraadt 1272: been handled by IPsec may be transmitted as cleartext.
1273: PF_KEY SA expirations may leak kernel resources.
1274: (patch included).</a>
1.294 david 1275: <li><a href="errata25.html#rc">Aug 5, 1999: In /etc/rc, use mktemp(1) for
1.97 deraadt 1276: motd re-writing and change the find(1) to use -execdir
1277: (patch included).</a>
1.294 david 1278: <li><a href="errata25.html#chflags">Jul 30, 1999: Do not permit regular
1.95 deraadt 1279: users to chflags(2) or fchflags(2) on character or block devices
1280: which they may currently be the owner of (patch included).</a>
1.294 david 1281: <li><a href="errata25.html#nroff">Jul 27, 1999: Cause groff(1) to be invoked
1.95 deraadt 1282: with the -S flag, when called by nroff(1) (patch included).</a>
1.93 deraadt 1283: </ul>
1284:
1.106 deraadt 1285: <p>
1286: <li>
1.288 matthieu 1287: <a name="24"></a>
1.235 miod 1288:
1.294 david 1289: <h3><font color="#e00000">OpenBSD 2.4 Security Advisories</font></h3>
1.75 deraadt 1290: These are the OpenBSD 2.4 advisories -- all these problems are solved
1.294 david 1291: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.75 deraadt 1292: OpenBSD 2.3 advisories listed below are fixed in OpenBSD 2.4.
1293:
1.96 deraadt 1294: <p>
1.75 deraadt 1295: <ul>
1.294 david 1296: <li><a href="errata24.html#poll">Mar 22, 1999: The nfds argument for poll(2) needs
1.91 deraadt 1297: to be constrained, to avoid kvm starvation (patch included).</a>
1.294 david 1298: <li><a href="errata24.html#tss">Mar 21, 1999: A change in TSS handling stops
1.91 deraadt 1299: another kernel crash case caused by the <strong>crashme</strong>
1300: program (patch included).</a>
1.294 david 1301: <li><a href="errata24.html#nlink">Feb 25, 1999: An unbounded increment on the
1.90 deraadt 1302: nlink value in FFS and EXT2FS filesystems can cause a system crash.
1.89 deraadt 1303: (patch included).</a>
1.294 david 1304: <li><a href="errata24.html#ping">Feb 23, 1999: Yet another buffer overflow
1.88 deraadt 1305: existed in ping(8). (patch included).</a>
1.294 david 1306: <li><a href="errata24.html#ipqrace">Feb 19, 1999: ipintr() had a race in use of
1.87 deraadt 1307: the ipq, which could permit an attacker to cause a crash.
1308: (patch included).</a>
1.294 david 1309: <li><a href="errata24.html#accept">Feb 17, 1999: A race condition in the
1.86 deraadt 1310: kernel between accept(2) and select(2) could permit an attacker
1311: to hang sockets from remote.
1312: (patch included).</a>
1.294 david 1313: <li><a href="errata24.html#maxqueue">Feb 17, 1999: IP fragment assembly can
1.85 deraadt 1314: bog the machine excessively and cause problems.
1315: (patch included).</a>
1.294 david 1316: <li><a href="errata24.html#trctrap">Feb 12, 1999: i386 T_TRCTRAP handling and
1.84 deraadt 1317: DDB interacted to possibly cause a crash.
1318: (patch included).</a>
1.294 david 1319: <li><a href="errata24.html#rst">Feb 11, 1999: TCP/IP RST handling was sloppy.
1.83 deraadt 1320: (patch included).</a>
1.294 david 1321: <li><a href="errata24.html#bootpd">Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 1322: problem in bootpd(8). (patch included).</a>
1.294 david 1323: <li><a href="errata24.html#termcap">Nov 19, 1998: There is a possibly locally
1.82 deraadt 1324: exploitable problem relating to environment variables in termcap
1325: and curses. (patch included).</a>
1.294 david 1326: <li><a href="errata24.html#tcpfix">Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 1327: bug in the TCP decoding kernel. (patch included).</a>
1.75 deraadt 1328: </ul>
1329:
1.106 deraadt 1330: <p>
1331: <li>
1.288 matthieu 1332: <a name="23"></a>
1.235 miod 1333:
1.294 david 1334: <h3><font color="#e00000">OpenBSD 2.3 Security Advisories</font></h3>
1.73 deraadt 1335: These are the OpenBSD 2.3 advisories -- all these problems are solved
1.294 david 1336: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.73 deraadt 1337: OpenBSD 2.2 advisories listed below are fixed in OpenBSD 2.3.
1.53 matthieu 1338:
1.96 deraadt 1339: <p>
1.53 matthieu 1340: <ul>
1.294 david 1341: <li><a href="errata23.html#bootpd">Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 1342: problem in bootpd(8). (patch included).</a>
1.294 david 1343: <li><a href="errata23.html#tcpfix">Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 1344: bug in the TCP decoding kernel. (patch included).</a>
1.294 david 1345: <li><a href="errata23.html#resolver">August 31, 1998: A benign looking resolver
1.190 mpech 1346: buffer overflow bug was re-introduced accidentally (patches included).</a>
1.294 david 1347: <li><a href="errata23.html#chpass">Aug 2, 1998:
1.190 mpech 1348: chpass(1) has a file descriptor leak which allows an
1349: attacker to modify /etc/master.passwd.</a>
1.294 david 1350: <li><a href="errata23.html#inetd">July 15, 1998: Inetd had a file descriptor leak.</a>
1351: <li><a href="errata23.html#fdalloc">Jul 2, 1998: setuid and setgid processes
1.72 deraadt 1352: should not be executed with fd slots 0, 1, or 2 free.
1353: (patch included).</a>
1.294 david 1354: <li><a href="errata23.html#xlib">June 6, 1998: Further problems with the X
1.71 deraadt 1355: libraries (patches included).</a>
1.294 david 1356: <li><a href="errata23.html#kill">May 17, 1998: kill(2) of setuid/setgid target
1.66 deraadt 1357: processes too permissive (4th revision patch included).</a>
1.294 david 1358: <li><a href="errata23.html#immutable">May 11, 1998: mmap() permits partial bypassing
1.60 deraadt 1359: of immutable and append-only file flags. (patch included).</a>
1.294 david 1360: <li><a href="errata23.html#ipsec">May 5, 1998: Incorrect handling of IPSEC packets
1.190 mpech 1361: if IPSEC is enabled (patch included).</a>
1.294 david 1362: <li><a href="errata23.html#xterm-xaw">May 1, 1998: Buffer overflow in xterm and Xaw
1.58 deraadt 1363: (CERT advisory VB-98.04) (patch included).</a>
1.53 matthieu 1364: </ul>
1.9 deraadt 1365:
1.106 deraadt 1366: <p>
1367: <li>
1.288 matthieu 1368: <a name="22"></a>
1.235 miod 1369:
1.294 david 1370: <h3><font color="#e00000">OpenBSD 2.2 Security Advisories</font></h3>
1.45 deraadt 1371: These are the OpenBSD 2.2 advisories. All these problems are solved
1.294 david 1372: in <a href="23.html">OpenBSD 2.3</a>. Some of these problems
1.45 deraadt 1373: still exist in other operating systems. (The supplied patches are for
1374: OpenBSD 2.2; they may or may not work on OpenBSD 2.1).
1.9 deraadt 1375:
1.96 deraadt 1376: <p>
1.9 deraadt 1377: <ul>
1.294 david 1378: <li><a href="errata22.html#ipsec">May 5, 1998: Incorrect handling of IPSEC
1.72 deraadt 1379: packets if IPSEC is enabled (patch included).</a>
1.294 david 1380: <li><a href="errata22.html#xterm-xaw">May 1, 1998: Buffer overflow in xterm
1.72 deraadt 1381: and Xaw (CERT advisory VB-98.04) (patch included).</a>
1.294 david 1382: <li><a href="errata22.html#uucpd">Apr 22, 1998: Buffer overflow in uucpd
1.72 deraadt 1383: (patch included).</a>
1.294 david 1384: <li><a href="errata22.html#rmjob">Apr 22, 1998: Buffer mismanagement in lprm
1.72 deraadt 1385: (patch included).</a>
1.294 david 1386: <li><a href="errata22.html#ping">Mar 31, 1998: Overflow in ping -R (patch included).</a>
1387: <li><a href="errata22.html#named">Mar 30, 1998: Overflow in named fake-iquery
1.59 deraadt 1388: (patch included).</a>
1.294 david 1389: <li><a href="errata22.html#mountd">Mar 2, 1998: Accidental NFS filesystem
1.72 deraadt 1390: export (patch included).</a>
1.112 philen 1391: <li><a href="advisories/mmap.txt">Feb 26, 1998: Read-write mmap() flaw.</a>
1.294 david 1392: Revision 3 of the patch is available <a href="errata22.html#mmap">here</a>
1.112 philen 1393: <li><a href="advisories/sourceroute.txt">Feb 19, 1998: Sourcerouted Packet
1.59 deraadt 1394: Acceptance.</a>
1.294 david 1395: A patch is available <a href="errata22.html#sourceroute">here</a>.
1396: <li><a href="errata22.html#ruserok">Feb 13, 1998: Setuid coredump & Ruserok()
1.72 deraadt 1397: flaw (patch included).</a>
1.294 david 1398: <li><a href="errata22.html#ldso">Feb 9, 1998: MIPS ld.so flaw (patch included).</a>
1.1 deraadt 1399: </ul>
1400:
1.106 deraadt 1401: <p>
1402: <li>
1.288 matthieu 1403: <a name="21"></a>
1.235 miod 1404:
1.294 david 1405: <h3><font color="#e00000">OpenBSD 2.1 Security Advisories</font></h3>
1.52 deraadt 1406: These are the OpenBSD 2.1 advisories. All these problems are solved
1.294 david 1407: in <a href="22.html">OpenBSD 2.2</a>. Some of these problems still
1.52 deraadt 1408: exist in other operating systems. (If you are running OpenBSD 2.1, we
1409: would strongly recommend an upgrade to the newest release, as this
1410: patch list only attempts at fixing the most important security
1411: problems. In particular, OpenBSD 2.2 fixes numerous localhost
1412: security problems. Many of those problems were solved in ways which
1413: make it hard for us to provide patches).
1414:
1.96 deraadt 1415: <p>
1.52 deraadt 1416: <ul>
1.112 philen 1417: <li><a href="advisories/signals.txt">Sep 15, 1997: Deviant Signals (patch included)</a>
1418: <li><a href="advisories/rfork.txt">Aug 2, 1997: Rfork() system call flaw
1.59 deraadt 1419: (patch included)</a>
1.112 philen 1420: <li><a href="advisories/procfs.txt">Jun 24, 1997: Procfs flaws (patch included)</a>
1.52 deraadt 1421: </ul>
1.51 deraadt 1422:
1.106 deraadt 1423: <p>
1424: <li>
1.288 matthieu 1425: <a name="20"></a>
1.235 miod 1426:
1.294 david 1427: <h3><font color="#e00000">OpenBSD 2.0 Security Advisories</font></h3>
1.99 deraadt 1428: These are the OpenBSD 2.0 advisories. All these problems are solved
1.294 david 1429: in <a href="21.html">OpenBSD 2.1</a>. Some of these problems still
1.99 deraadt 1430: exist in other operating systems. (If you are running OpenBSD 2.0, we
1431: commend you for being there back in the old days!, but you're really
1432: missing out if you don't install a new version!)
1433:
1434: <p>
1435: <ul>
1.112 philen 1436: <li><a href="advisories/res_random.txt">April 22, 1997: Predictable IDs in the
1.99 deraadt 1437: resolver (patch included)</a>
1438: <li>Many others... if people can hunt them down, please let me know
1439: and we'll put them up here.
1440: </ul>
1.51 deraadt 1441: <p>
1.106 deraadt 1442:
1.288 matthieu 1443: <a name="watching"></a>
1.294 david 1444: <li><h3><font color="#e00000">Watching our Changes</font></h3><p>
1.106 deraadt 1445:
1.21 deraadt 1446: Since we take a proactive stance with security, we are continually
1447: finding and fixing new security problems. Not all of these problems
1.80 espie 1448: get widely reported because (as stated earlier) many of them are not
1.45 deraadt 1449: confirmed to be exploitable; many simple bugs we fix do turn out to
1450: have security consequences we could not predict. We do not have the
1451: time resources to make these changes available in the above format.<p>
1.21 deraadt 1452:
1453: Thus there are usually minor security fixes in the current source code
1454: beyond the previous major OpenBSD release. We make a limited
1.45 deraadt 1455: guarantee that these problems are of minimal impact and unproven
1.44 ian 1456: exploitability. If we discover that a problem definitely matters for
1.45 deraadt 1457: security, patches will show up here <strong>VERY</strong> quickly.<p>
1.21 deraadt 1458:
1.45 deraadt 1459: People who are really concerned with security can do a number of
1460: things:<p>
1.21 deraadt 1461:
1462: <ul>
1463: <li>If you understand security issues, watch our
1.294 david 1464: <a href="mail.html">source-changes mailing list</a> and keep an
1.23 deraadt 1465: eye out for things which appear security related. Since
1.21 deraadt 1466: exploitability is not proven for many of the fixes we make,
1467: do not expect the relevant commit message to say "SECURITY FIX!".
1468: If a problem is proven and serious, a patch will be available
1469: here very shortly after.
1.161 horacio 1470: <li>In addition to source changes, you can watch our <a href="mail.html">
1.160 ericj 1471: security-announce mailing list</a> which will notify you for every
1.186 ian 1472: security related item that the OpenBSD team deems as a possible threat,
1.160 ericj 1473: and instruct you on how to patch the problem.
1.21 deraadt 1474: <li>Track our current source code tree, and teach yourself how to do a
1.29 deraadt 1475: complete system build from time to time (read /usr/src/Makefile
1476: carefully). Users can make the assumption that the current
1477: source tree always has stronger security than the previous release.
1.45 deraadt 1478: However, building your own system from source code is not trivial;
1.265 miod 1479: it is nearly 600MB of source code, and problems do occur as we
1.45 deraadt 1480: transition between major releases.
1.115 ericj 1481: <li>Install a binary snapshot for your
1.80 espie 1482: architecture, which are made available fairly often. For
1.29 deraadt 1483: instance, an i386 snapshot is typically made available weekly.
1.21 deraadt 1484: </ul>
1485:
1.9 deraadt 1486: <p>
1.288 matthieu 1487: <a name="reporting"></a>
1.294 david 1488: <li><h3><font color="#e00000">Reporting problems</font></h3><p>
1.3 deraadt 1489:
1.5 deraadt 1490: <p> If you find a new security problem, you can mail it to
1.294 david 1491: <a href="mailto:deraadt@openbsd.org">deraadt@openbsd.org</a>.
1.7 deraadt 1492: <br>
1.5 deraadt 1493: If you wish to PGP encode it (but please only do so if privacy is very
1.112 philen 1494: urgent, since it is inconvenient) use this <a href="advisories/pgpkey.txt">pgp key</a>.
1.5 deraadt 1495:
1.107 deraadt 1496: <p>
1.288 matthieu 1497: <a name="papers"></a>
1.294 david 1498: <li><h3><font color="#e00000">Further Reading</font></h3><p>
1.107 deraadt 1499:
1500: A number of papers have been written by OpenBSD team members, about security
1501: related changes they have done in OpenBSD. The postscript versions of these
1.108 deraadt 1502: documents are available as follows.<p>
1.107 deraadt 1503:
1504: <ul>
1.113 deraadt 1505: <li>A Future-Adaptable Password Scheme.<br>
1.294 david 1506: <a href="events.html#usenix99">Usenix 1999</a>,
1507: by <a href="mailto:provos@openbsd.org">Niels Provos</a>,
1508: <a href="mailto:dm@openbsd.org">David Mazieres</a>.<br>
1509: <a href="papers/bcrypt-paper.ps">paper</a> and
1510: <a href="papers/bcrypt-slides.ps">slides</a>.
1.113 deraadt 1511: <p>
1512: <li>Cryptography in OpenBSD: An Overview.<br>
1.294 david 1513: <a href="events.html#usenix99">Usenix 1999</a>,
1514: by <a href="mailto:deraadt@openbsd.org">Theo de Raadt</a>,
1515: <a href="mailto:niklas@openbsd.org">Niklas Hallqvist</a>,
1516: <a href="mailto:art@openbsd.org">Artur Grabowski</a>,
1517: <a href="mailto:angelos@openbsd.org">Angelos D. Keromytis</a>,
1518: <a href="mailto:provos@openbsd.org">Niels Provos</a>.<br>
1519: <a href="papers/crypt-paper.ps">paper</a> and
1520: <a href="papers/crypt-slides.ps">slides</a>.
1.113 deraadt 1521: <p>
1522: <li>strlcpy and strlcat -- consistent, safe, string copy and concatenation.<br>
1.294 david 1523: <a href="events.html#usenix99">Usenix 1999</a>,
1524: by <a href="mailto:millert@openbsd.org">Todd C. Miller</a>,
1525: <a href="mailto:deraadt@openbsd.org">Theo de Raadt</a>.<br>
1526: <a href="papers/strlcpy-paper.ps">paper</a> and
1527: <a href="papers/strlcpy-slides.ps">slides</a>.
1.113 deraadt 1528: <p>
1.118 deraadt 1529: <li>Dealing with Public Ethernet Jacks-Switches, Gateways, and Authentication.<br>
1.294 david 1530: <a href="events.html#lisa99">LISA 1999</a>,
1531: by <a href="mailto:beck@openbsd.org">Bob Beck</a>.<br>
1532: <a href="papers/authgw-paper.ps">paper</a> and
1533: <a href="papers/authgw-slides.ps">slides</a>.
1.118 deraadt 1534: <p>
1.153 jufi 1535: <li>Encrypting Virtual Memory<br>
1.294 david 1536: <a href="events.html#sec2000">Usenix Security 2000</a>,
1537: <a href="mailto:provos@openbsd.org">Niels Provos</a>.<br>
1538: <a href="papers/swapencrypt.ps">paper</a> and
1539: <a href="papers/swapencrypt-slides.ps">slides</a>.
1.142 deraadt 1540: <p>
1.107 deraadt 1541: </ul>
1.294 david 1542: </ul>
1.106 deraadt 1543:
1.2 deraadt 1544: <hr>
1.294 david 1545: <a href="index.html"><img height=24 width=24 src="back.gif" border=0 alt="OpenBSD"></a>
1546: <a href="mailto:www@openbsd.org">www@openbsd.org</a>
1.24 deraadt 1547: <br>
1.340 ! deraadt 1548: <small>$OpenBSD: security.html,v 1.339 2007/03/06 01:58:05 deraadt Exp $</small>
1.1 deraadt 1549:
1.24 deraadt 1550: </body>
1551: </html>