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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>,
61: <a href="#39">3.9</a>.
1.114 philen 62: </td>
63: </tr>
64: </table>
1.56 deraadt 65: <hr>
66:
1.294 david 67: <a name="goals"></a>
1.278 deraadt 68: <ul>
1.294 david 69: <li><h3><font color="#e00000">Goal</font></h3><p>
1.22 deraadt 70:
1.14 deraadt 71: OpenBSD believes in strong security. Our aspiration is to be NUMBER
1.22 deraadt 72: ONE in the industry for security (if we are not already there). Our
73: open software development model permits us to take a more
74: uncompromising view towards increased security than Sun, SGI, IBM, HP,
75: or other vendors are able to. We can make changes the vendors would
1.27 deraadt 76: not make. Also, since OpenBSD is exported with <a href=crypto.html>
1.45 deraadt 77: cryptography</a>, we are able to take cryptographic approaches towards
78: fixing security problems.<p>
1.18 deraadt 79:
1.288 matthieu 80: <a name="disclosure"></a>
1.294 david 81: <li><h3><font color="#e00000">Full Disclosure</font></h3><p>
1.106 deraadt 82:
1.45 deraadt 83: Like many readers of the
1.196 jufi 84: <a href="http://online.securityfocus.com/archive/1">
1.18 deraadt 85: BUGTRAQ mailing list</a>,
1.106 deraadt 86: we believe in full disclosure of security problems. In the
87: operating system arena, we were probably the first to embrace
88: the concept. Many vendors, even of free software, still try
89: to hide issues from their users.<p>
90:
91: Security information moves very fast in cracker circles. On the other
92: hand, our experience is that coding and releasing of proper security
93: fixes typically requires about an hour of work -- very fast fix
94: turnaround is possible. Thus we think that full disclosure helps the
95: people who really care about security.<p>
96:
1.288 matthieu 97: <a name="process"></a>
1.294 david 98: <li><h3><font color="#e00000">Audit Process</font></h3><p>
1.15 deraadt 99:
1.12 deraadt 100: Our security auditing team typically has between six and twelve
1.45 deraadt 101: members who continue to search for and fix new security holes. We
102: have been auditing since the summer of 1996. The process we follow to
103: increase security is simply a comprehensive file-by-file analysis of
1.106 deraadt 104: every critical software component. We are not so much looking for
105: security holes, as we are looking for basic software bugs, and if
1.138 deraadt 106: years later someone discovers the problem used to be a security
1.106 deraadt 107: issue, and we fixed it because it was just a bug, well, all the
108: better. Flaws have been found in just about every area of the system.
109: Entire new classes of security problems have been found during our
110: audit, and often source code which had been audited earlier needs
111: re-auditing with these new flaws in mind. Code often gets audited
112: multiple times, and by multiple people with different auditing
113: skills.<p>
1.12 deraadt 114:
1.94 deraadt 115: Some members of our security auditing team worked for Secure Networks,
116: the company that made the industry's premier network security scanning
117: software package Ballista (Secure Networks got purchased by Network
118: Associates, Ballista got renamed to Cybercop Scanner, and well...)
119: That company did a lot of security research, and thus fit in well
1.106 deraadt 120: with the OpenBSD stance. OpenBSD passed Ballista's tests with flying
121: colours since day 1.<p>
1.31 deraadt 122:
1.34 deraadt 123: Another facet of our security auditing process is its proactiveness.
1.45 deraadt 124: In most cases we have found that the determination of exploitability
125: is not an issue. During our ongoing auditing process we find many
126: bugs, and endeavor to fix them even though exploitability is not
127: proven. We fix the bug, and we move on to find other bugs to fix. We
128: have fixed many simple and obvious careless programming errors in code
129: and only months later discovered that the problems were in fact
130: exploitable. (Or, more likely someone on
1.197 jufi 131: <a href="http://online.securityfocus.com/archive/1">BUGTRAQ</a>
1.45 deraadt 132: would report that other operating systems were vulnerable to a `newly
133: discovered problem', and then it would be discovered that OpenBSD had
134: been fixed in a previous release). In other cases we have been saved
135: from full exploitability of complex step-by-step attacks because we
136: had fixed one of the intermediate steps. An example of where we
1.94 deraadt 137: managed such a success is the lpd advisory that Secure Networks put out.
138: <p>
1.29 deraadt 139:
1.288 matthieu 140: <a name="newtech"></a>
1.294 david 141: <li><h3><font color="#e00000">New Technologies</font></h3><p>
1.278 deraadt 142:
143: As we audit source code, we often invent new ways of solving problems.
144: Sometimes these ideas have been used before in some random application
145: written somewhere, but perhaps not taken to the degree that we do.
146: <p>
147:
148: <ul>
149: <li>strlcpy() and strlcat()
150: <li>Memory protection purify
151: <ul>
152: <li>W^X
153: <li>.rodata segment
154: <li>Guard pages
155: <li>Randomized malloc()
156: <li>Randomized mmap()
157: <li>atexit() and stdio protection
158: </ul>
1.295 otto 159: <li>Privilege separation
1.278 deraadt 160: <li>Privilege revocation
161: <li>Chroot jailing
162: <li>New uids
163: <li>ProPolice
164: <li>... and others
165: </ul>
166: <p>
167:
1.294 david 168: <li><h3><font color="#e00000">The Reward</font></h3><p>
1.106 deraadt 169:
1.45 deraadt 170: Our proactive auditing process has really paid off. Statements like
1.35 deraadt 171: ``This problem was fixed in OpenBSD about 6 months ago'' have become
1.45 deraadt 172: commonplace in security forums like
1.197 jufi 173: <a href="http://online.securityfocus.com/archive/1">BUGTRAQ</a>.<p>
1.35 deraadt 174:
1.45 deraadt 175: The most intense part of our security auditing happened immediately
1.80 espie 176: before the OpenBSD 2.0 release and during the 2.0->2.1 transition,
1.45 deraadt 177: over the last third of 1996 and first half of 1997. Thousands (yes,
178: thousands) of security issues were fixed rapidly over this year-long
179: period; bugs like the standard buffer overflows, protocol
180: implementation weaknesses, information gathering, and filesystem
181: races. Hence most of the security problems that we encountered were
182: fixed before our 2.1 release, and then a far smaller number needed
183: fixing for our 2.2 release. We do not find as many problems anymore,
184: it is simply a case of diminishing returns. Recently the security
185: problems we find and fix tend to be significantly more obscure or
186: complicated. Still we will persist for a number of reasons:<p>
1.36 deraadt 187:
1.35 deraadt 188: <ul>
1.45 deraadt 189: <li>Occasionally we find a simple problem we missed earlier. Doh!
1.35 deraadt 190: <li>Security is like an arms race; the best attackers will continue
1.45 deraadt 191: to search for more complicated exploits, so we will too.
192: <li>Finding and fixing subtle flaws in complicated software is
193: a lot of fun.
1.35 deraadt 194: </ul>
1.106 deraadt 195: <p>
1.15 deraadt 196:
1.14 deraadt 197: The auditing process is not over yet, and as you can see we continue
1.28 deraadt 198: to find and fix new security flaws.<p>
1.12 deraadt 199:
1.288 matthieu 200: <a name="default"></a>
1.294 david 201: <li><h3><font color="#e00000">"Secure by Default"</font></h3><p>
1.106 deraadt 202:
203: To ensure that novice users of OpenBSD do not need to become security
204: experts overnight (a viewpoint which other vendors seem to have), we
205: ship the operating system in a Secure by Default mode. All non-essential
206: services are disabled. As the user/administrator becomes more familiar
207: with the system, he will discover that he has to enable daemons and other
208: parts of the system. During the process of learning how to enable a new
209: service, the novice is more likely to learn of security considerations.<p>
210:
211: This is in stark contrast to the increasing number of systems that
212: ship with NFS, mountd, web servers, and various other services enabled
213: by default, creating instantaneous security problems for their users
214: within minutes after their first install.<p>
215:
1.288 matthieu 216: <a name="crypto"></a>
1.294 david 217: <li><h3><font color="#e00000">Cryptography</font></h3><p>
1.106 deraadt 218:
219: And of course, since the OpenBSD project is based in Canada, it is possible
220: for us to integrate cryptography. For more information, read the page
1.116 deraadt 221: outlining <a href=crypto.html>what we have done with cryptography</a>.</p>
1.106 deraadt 222:
1.294 david 223: <li><h3><font color="#e00000">Advisories</font></h3><p>
1.106 deraadt 224:
225: <li>
1.321 brad 226: <a name="39"></a>
227:
228: <h3><font color="#e00000">OpenBSD 3.9 Security Advisories</font></h3>
229: These are the OpenBSD 3.9 advisories -- all these problems are solved
230: in <a href=anoncvs.html>OpenBSD current</a> and the
231: <a href=stable.html>patch branch</a>.
232:
233: <p>
234: <ul>
1.329 ! brad 235: <li><a href="errata.html#openssl">Sep 8, 2006:
! 236: Due to incorrect PKCS#1 v1.5 padding validation in OpenSSL, it is
! 237: possible for an attacker to construct an invalid signature which
! 238: OpenSSL would accept as a valid PKCS#1 v1.5 signature.</a>
1.328 brad 239: <li><a href="errata.html#bind">Sep 8, 2006:
240: Two Denial of Service issues have been found with BIND.</a>
1.327 brad 241: <li><a href="errata.html#sppp">Sep 2, 2006:
242: Due to the failure to correctly validate LCP configuration option
243: lengths, it is possible for an attacker to send LCP packets via an
244: sppp(4) connection causing the kernel to panic.</a>
1.326 brad 245: <li><a href="errata.html#isakmpd">Aug 25, 2006:
246: A problem in isakmpd(8) caused IPsec to run partly without replay
247: protection.</a>
248: <li><a href="errata.html#sem">Aug 25, 2006:
249: It is possible to cause the kernel to panic when more than the default
250: number of sempahores have been allocated.</a>
251: <li><a href="errata.html#dhcpd">Aug 25, 2006:
252: Due to an off-by-one error in dhcpd(8) it is possible to cause dhcpd(8)
253: to exit by sending a DHCPDISCOVER packet with a 32-byte client identifier
254: option.</a>
255: <li><a href="errata.html#sendmail3">Aug 25, 2006:
256: A potential denial of service problem has been found in sendmail.</a>
1.325 brad 257: <li><a href="errata.html#httpd">Jul 30, 2006:
258: httpd(8)'s mod_rewrite has a potentially exploitable off-by-one buffer
259: overflow.</a>
1.324 brad 260: <li><a href="errata.html#sendmail2">Jun 15, 2006:
261: A potential denial of service problem has been found in sendmail.</a>
1.322 brad 262: <li><a href="errata.html#xorg">May 2, 2006:
263: A buffer overflow exists in the Render extension of the X server.</a>
1.321 brad 264: <li><a href="errata.html#sendmail">Mar 25, 2006:
265: A race condition has been reported to exist in the handling by sendmail
266: of asynchronous signals.</a>
267: </ul>
268:
269: <li>
1.318 deraadt 270: <a name="38"></a>
271:
272: <h3><font color="#e00000">OpenBSD 3.8 Security Advisories</font></h3>
273: These are the OpenBSD 3.8 advisories -- all these problems are solved
274: in <a href=anoncvs.html>OpenBSD current</a> and the
275: <a href=stable.html>patch branch</a>.
276:
277: <p>
278: <ul>
1.329 ! brad 279: <li><a href="errata38.html#openssl">Sep 8, 2006:
! 280: Due to incorrect PKCS#1 v1.5 padding validation in OpenSSL, it is
! 281: possible for an attacker to construct an invalid signature which
! 282: OpenSSL would accept as a valid PKCS#1 v1.5 signature.</a>
1.328 brad 283: <li><a href="errata38.html#bind">Sep 8, 2006:
284: Two Denial of Service issues have been found with BIND.</a>
1.327 brad 285: <li><a href="errata38.html#sppp">Sep 2, 2006:
286: Due to the failure to correctly validate LCP configuration option
287: lengths, it is possible for an attacker to send LCP packets via an
288: sppp(4) connection causing the kernel to panic.</a>
1.326 brad 289: <li><a href="errata38.html#isakmpd">Aug 25, 2006:
290: A problem in isakmpd(8) caused IPsec to run partly without replay
291: protection.</a>
292: <li><a href="errata38.html#sem">Aug 25, 2006:
293: It is possible to cause the kernel to panic when more than the default
294: number of sempahores have been allocated.</a>
295: <li><a href="errata38.html#dhcpd">Aug 25, 2006:
296: Due to an off-by-one error in dhcpd(8) it is possible to cause dhcpd(8)
297: to exit by sending a DHCPDISCOVER packet with a 32-byte client identifier
298: option.</a>
299: <li><a href="errata38.html#sendmail3">Aug 25, 2006:
300: A potential denial of service problem has been found in sendmail.</a>
1.325 brad 301: <li><a href="errata38.html#httpd">Jul 30, 2006:
302: httpd(8)'s mod_rewrite has a potentially exploitable off-by-one buffer
303: overflow.</a>
1.324 brad 304: <li><a href="errata38.html#sendmail2">Jun 15, 2006:
305: A potential denial of service problem has been found in sendmail.</a>
1.322 brad 306: <li><a href="errata38.html#xorg">May 2, 2006:
307: A buffer overflow exists in the Render extension of the X server.</a>
1.321 brad 308: <li><a href="errata38.html#sendmail">Mar 25, 2006:
309: A race condition has been reported to exist in the handling by sendmail
310: of asynchronous signals.</a>
311: <li><a href="errata38.html#ssh">Feb 12, 2006:
1.320 brad 312: Josh Bressers has reported a weakness in OpenSSH caused due to the
313: insecure use of the system(3) function in scp(1) when performing copy
314: operations using filenames that are supplied by the user from the
315: command line.</a>
1.321 brad 316: <li><a href="errata38.html#fd">Jan 5, 2006:
1.319 brad 317: Do not allow users to trick suid programs into re-opening files via
318: /dev/fd.</a>
1.321 brad 319: <li><a href="errata38.html#perl">Jan 5, 2006:
1.319 brad 320: A buffer overflow has been found in the Perl interpreter with the
321: sprintf function which may be exploitable under certain conditions.</a>
1.318 deraadt 322: </ul>
323:
1.323 steven 324: <p>
325: OpenBSD 3.7 and earlier releases are not supported anymore. The following
326: paragraphs only list advisories issued while they were maintained; these
327: releases are likely to be affected by the advisories for more recent releases.
328: <br>
329:
1.318 deraadt 330: <li>
1.312 david 331: <a name="37"></a>
332:
333: <h3><font color="#e00000">OpenBSD 3.7 Security Advisories</font></h3>
334: These are the OpenBSD 3.7 advisories -- all these problems are solved
1.323 steven 335: in <a href="anoncvs.html">OpenBSD current</a>. The
336: <a href="stable.html">patch branch</a> for 3.7 is no longer being maintained,
337: you should update your machine.
1.312 david 338:
339: <p>
340: <ul>
1.322 brad 341: <li><a href="errata37.html#xorg">May 2, 2006:
342: A buffer overflow exists in the Render extension of the X server.</a>
1.321 brad 343: <li><a href="errata37.html#sendmail">Mar 25, 2006:
344: A race condition has been reported to exist in the handling by sendmail
345: of asynchronous signals.</a>
1.320 brad 346: <li><a href="errata37.html#ssh">Feb 12, 2006:
347: Josh Bressers has reported a weakness in OpenSSH caused due to the
348: insecure use of the system(3) function in scp(1) when performing copy
349: operations using filenames that are supplied by the user from the
350: command line.</a>
1.319 brad 351: <li><a href="errata37.html#fd">Jan 5, 2006:
352: Do not allow users to trick suid programs into re-opening files via
353: /dev/fd.</a>
354: <li><a href="errata37.html#perl">Jan 5, 2006:
355: A buffer overflow has been found in the Perl interpreter with the
356: sprintf function which may be exploitable under certain conditions.</a>
1.318 deraadt 357: <li><a href="errata37.html#libz2">Jul 21, 2005:
1.317 millert 358: Fix another buffer overflow in the zlib library that may be exploitable.</a>
1.318 deraadt 359: <li><a href="errata37.html#libz">Jul 6, 2005:
1.316 millert 360: Fix a buffer overflow in the zlib library that may be exploitable.</a>
1.318 deraadt 361: <li><a href="errata37.html#sudo">Jun 20, 2005:
1.316 millert 362: Fix a race condition in sudo(8) that could allow a user
1.315 millert 363: to run arbitrary commands.</a>
1.318 deraadt 364: <li><a href="errata37.html#cvs">Jun 7, 2005:
1.313 brad 365: Fix a buffer overflow, memory leaks, and NULL pointer
366: dereference in cvs(1).</a>
1.312 david 367: </ul>
368:
369: <li>
1.301 miod 370: <a name="36"></a>
371:
372: <h3><font color="#e00000">OpenBSD 3.6 Security Advisories</font></h3>
373: These are the OpenBSD 3.6 advisories -- all these problems are solved
1.323 steven 374: in <a href="anoncvs.html">OpenBSD current</a>. The
375: <a href="stable.html">patch branch</a> for 3.6 is no longer being maintained,
376: you should update your machine.
1.301 miod 377:
378: <p>
1.302 markus 379: <ul>
1.317 millert 380: <li><a href="errata36.html#libz2">Jul 21, 2005:
381: Fix another buffer overflow in the zlib library that may be exploitable.</a>
1.316 millert 382: <li><a href="errata36.html#libz">Jul 6, 2005:
383: Fix a buffer overflow in the zlib library that may be exploitable.</a>
1.315 millert 384: <li><a href="errata36.html#sudo">Jun 20, 2005:
1.316 millert 385: Fix a race condition in sudo(8) that could allow a user
1.315 millert 386: to run arbitrary commands.</a>
1.311 deraadt 387: <li><a href="errata36.html#cvs">Apr 28, 2005:
1.310 brad 388: Fix a buffer overflow, memory leaks, and NULL pointer
389: dereference in cvs(1).</a>
1.311 deraadt 390: <li><a href="errata36.html#telnet">Mar 30, 2005:
1.309 brad 391: Due to buffer overflows in telnet(1), a malicious
392: server or man-in-the-middle attack could allow
393: execution of arbitrary code with the privileges of
394: the user invoking telnet(1).</a>
1.311 deraadt 395: <li><a href="errata36.html#copy">Mar 16, 2005:
1.307 brad 396: More stringent checking should be done in the copy(9)
397: functions to prevent their misuse.</a>
1.311 deraadt 398: <li><a href="errata36.html#locore">Feb 28, 2005:
1.306 brad 399: More stringent checking should be done in the copy(9)
400: functions to prevent their misuse.</a>
1.311 deraadt 401: <li><a href="errata36.html#httpd">Jan 12, 2005:
1.304 brad 402: httpd(8)'s mod_include module fails to properly validate
403: the length of user supplied tag strings prior to copying
1.305 brad 404: them to a local buffer, causing a buffer overflow.</a>
1.311 deraadt 405: <li><a href="errata36.html#pfkey">Dec 14, 2004:
1.302 markus 406: On systems running isakmpd(8) it is possible for a local
407: user to cause kernel memory corruption and system panic by
1.303 markus 408: setting ipsec(4) credentials on a socket.</a>
1.302 markus 409: </ul>
1.301 miod 410:
411: <li>
1.288 matthieu 412: <a name="35"></a>
1.279 deraadt 413:
1.294 david 414: <h3><font color="#e00000">OpenBSD 3.5 Security Advisories</font></h3>
1.279 deraadt 415: These are the OpenBSD 3.5 advisories -- all these problems are solved
1.314 miod 416: in <a href="anoncvs.html">OpenBSD current</a>. The
417: <a href="stable.html">patch branch</a> for 3.5 is no longer being maintained,
418: you should update your machine.
1.279 deraadt 419:
420: <p>
421: <ul>
1.310 brad 422: <li><a href="errata35.html#cvs4">Apr 28, 2005:
423: Fix a buffer overflow, memory leaks, and NULL pointer
424: dereference in cvs(1).</a>
1.309 brad 425: <li><a href="errata35.html#telnet">Mar 30, 2005:
426: Due to buffer overflows in telnet(1), a malicious
427: server or man-in-the-middle attack could allow
428: execution of arbitrary code with the privileges of
429: the user invoking telnet(1).</a>
1.308 brad 430: <li><a href="errata35.html#copy">Mar 16, 2005:
1.307 brad 431: More stringent checking should be done in the copy(9)
432: functions to prevent their misuse.</a>
1.306 brad 433: <li><a href="errata35.html#locore">Feb 28, 2005:
434: More stringent checking should be done in the copy(9)
435: functions to prevent their misuse.</a>
1.304 brad 436: <li><a href="errata35.html#httpd3">Jan 12, 2005:
437: httpd(8)'s mod_include module fails to properly validate
438: the length of user supplied tag strings prior to copying
1.305 brad 439: them to a local buffer, causing a buffer overflow.</a>
1.302 markus 440: <li><a href="errata35.html#pfkey">Dec 14, 2004:
441: On systems running isakmpd(8) it is possible for a local
442: user to cause kernel memory corruption and system panic by
1.303 markus 443: setting ipsec(4) credentials on a socket.</a>
1.301 miod 444: <li><a href="errata35.html#radius">Sep 20, 2004:
1.299 millert 445: Radius-based authentication is vulnerable to spoofed replies.</a>
1.301 miod 446: <li><a href="errata35.html#xpm">Sep 16, 2004:
1.298 brad 447: The Xpm library has vulnerabilities when parsing malicious images.</a>
1.301 miod 448: <li><a href="errata35.html#httpd2"> Sep 10, 2004:
1.297 brad 449: httpd(8)'s mod_rewrite module can be made to write one zero byte in
450: an arbitrary memory position outside of a char array, causing a DoS
451: or possibly buffer overflows.</a>
1.301 miod 452: <li><a href="errata35.html#httpd"> Jun 12, 2004:
1.300 deraadt 453: Multiple vulnerabilities have been found in httpd(8) / mod_ssl.</a>
1.301 miod 454: <li><a href="errata35.html#isakmpd"> Jun 10, 2004:
1.291 hshoexer 455: isakmpd(8) still has issues with unauthorized SA deletion,
1.293 brad 456: an attacker can delete IPsec tunnels at will.</a>
1.301 miod 457: <li><a href="errata35.html#cvs3"> Jun 9, 2004:
1.290 millert 458: Multiple remote vulnerabilities have been found in the cvs(1)
459: server which can be used by CVS clients to crash or execute
1.293 brad 460: arbitrary code on the server.</a>
1.301 miod 461: <li><a href="errata35.html#kerberos"> May 30, 2004:
1.289 beck 462: kdc(8) performs inadequate checking of request fields, leading
463: to the possibility of principal impersonation from other
464: Kerberos realms if they are trusted with a cross-realm trust.</a>
1.301 miod 465: <li><a href="errata35.html#xdm"> May 26, 2004:
1.287 matthieu 466: xdm(1) ignores the requestPort resource and creates a
1.293 brad 467: listening socket regardless of the setting in xdm-config.</a>
1.301 miod 468: <li><a href="errata35.html#cvs2"> May 20, 2004:
1.286 otto 469: A buffer overflow in the cvs(1) server has been found,
470: which can be used by CVS clients to execute arbitrary code on
1.293 brad 471: the server.</a>
1.301 miod 472: <li><a href="errata35.html#procfs"> May 13, 2004:
1.282 tedu 473: Integer overflow problems were found in procfs, allowing
1.293 brad 474: reading of arbitrary kernel memory.</a>
1.301 miod 475: <li><a href="errata35.html#cvs"> May 5, 2004:
1.281 otto 476: Pathname validation problems have been found in cvs(1),
477: allowing clients and servers access to files outside the
1.293 brad 478: repository or local CVS tree.</a>
1.279 deraadt 479: </ul>
480:
481: <p>
482: <li>
1.288 matthieu 483: <a name="34"></a>
1.261 david 484:
1.294 david 485: <h3><font color="#e00000">OpenBSD 3.4 Security Advisories</font></h3>
1.261 david 486: These are the OpenBSD 3.4 advisories -- all these problems are solved
1.301 miod 487: in <a href="anoncvs.html">OpenBSD current</a>. The
488: <a href="stable.html">patch branch</a> for 3.4 is no longer being maintained,
489: you should update your machine.
1.261 david 490: <p>
491: <ul>
1.302 markus 492: <li><a href="errata34.html#pfkey">Dec 14, 2004:
493: On systems running isakmpd(8) it is possible for a local
494: user to cause kernel memory corruption and system panic by
1.303 markus 495: setting ipsec(4) credentials on a socket.</a>
1.298 brad 496: <li><a href="errata34.html#xpm">Sep 16, 2004:
497: The Xpm library has vulnerabilities when parsing malicious images.</a>
1.297 brad 498: <li><a href="errata34.html#httpd4"> Sep 10, 2004:
499: httpd(8)'s mod_rewrite module can be made to write one zero byte in
500: an arbitrary memory position outside of a char array, causing a DoS
501: or possibly buffer overflows.</a>
1.294 david 502: <li><a href="errata34.html#httpd3"> Jun 12, 2004:
1.300 deraadt 503: Multiple vulnerabilities have been found in httpd(8) / mod_ssl.</a>
1.294 david 504: <li><a href="errata34.html#isakmpd3"> Jun 10, 2004:
1.292 brad 505: isakmpd(8) still has issues with unauthorized SA deletion,
1.293 brad 506: an attacker can delete IPsec tunnels at will.</a>
1.294 david 507: <li><a href="errata34.html#cvs3"> Jun 9, 2004:
1.290 millert 508: Multiple remote vulnerabilities have been found in the cvs(1)
509: server which can be used by CVS clients to crash or execute
1.293 brad 510: arbitrary code on the server.</a>
1.294 david 511: <li><a href="errata34.html#kerberos"> May 30, 2004:
1.289 beck 512: kdc(8) performs inadequate checking of request fields, leading
513: to the possibility of principal impersonation from other
514: Kerberos realms if they are trusted with a cross-realm trust.</a>
1.294 david 515: <li><a href="errata34.html#cvs2"> May 20, 2004:
1.286 otto 516: A buffer overflow in the cvs(1) server has been found,
517: which can be used by CVS clients to execute arbitrary code on
518: the server.</a>
1.294 david 519: <li><a href="errata34.html#procfs"> May 13, 2004:
1.282 tedu 520: Integer overflow problems were found in procfs, allowing
521: reading of arbitrary kernel memory.</a>
1.294 david 522: <li><a href="errata34.html#cvs"> May 5, 2004:
1.281 otto 523: Pathname validation problems have been found in cvs(1),
524: allowing clients and servers access to files outside the
525: repository or local CVS tree.</a>
1.294 david 526: <li><a href="errata34.html#openssl"> March 17, 2004:
1.277 millert 527: A missing check for a NULL-pointer dereference may allow a
1.281 otto 528: remote attacker to crash applications using OpenSSL.</a>
1.294 david 529: <li><a href="errata34.html#isakmpd2"> March 17, 2004:
1.276 brad 530: Defects in the payload validation and processing functions of
531: isakmpd have been discovered. An attacker could send malformed
532: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.294 david 533: <li><a href="errata34.html#httpd2"> March 13, 2004:
1.275 brad 534: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
535: access module, using IP addresses without a netmask on big endian
536: 64-bit platforms causes the rules to fail to match.</a>
1.294 david 537: <li><a href="errata34.html#ip6"> February 8, 2004:
1.272 dhartmei 538: An IPv6 MTU handling problem exists that could be used by an
539: attacker to cause a denial of service attack.</a>
1.294 david 540: <li><a href="errata34.html#sysvshm"> February 5, 2004:
1.271 millert 541: A reference counting bug in shmat(2) could be used to write to
542: kernel memory under certain circumstances.</a>
1.294 david 543: <li><a href="errata34.html#isakmpd">January 13, 2004:
1.266 brad 544: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 545: by Thomas Walpuski.</a>
1.294 david 546: <li><a href="errata34.html#ibcs2">November 17, 2003:
1.264 henning 547: It may be possible for a local user to overrun the stack in
548: compat_ibcs2(8) and cause a kernel panic.</a>
1.294 david 549: <li><a href="errata34.html#asn1">November 1, 2003:
1.262 margarid 550: The use of certain ASN.1 encodings or malformed public keys may
551: allow an attacker to mount a denial of service attack against
552: applications linked with ssl(3).</a>
1.261 david 553: </ul>
554:
555: <li>
1.288 matthieu 556: <a name="33"></a>
1.246 deraadt 557:
1.294 david 558: <h3><font color="#e00000">OpenBSD 3.3 Security Advisories</font></h3>
1.246 deraadt 559: These are the OpenBSD 3.3 advisories -- all these problems are solved
1.294 david 560: in <a href="anoncvs.html">OpenBSD current</a>. The
561: <a href="stable.html">patch branch</a> for 3.3 is no longer being maintained,
1.284 otto 562: you should update your machine.
1.246 deraadt 563: <p>
564: <ul>
1.294 david 565: <li><a href="errata33.html#cvs"> May 5, 2004:
1.281 otto 566: Pathname validation problems have been found in cvs(1),
567: allowing clients and servers access to files outside the
568: repository or local CVS tree.</a>
1.294 david 569: <li><a href="errata33.html#openssl"> March 17, 2004:
1.277 millert 570: A missing check for a NULL-pointer dereference may allow a
1.281 otto 571: remote attacker to crash applications using OpenSSL.</a>
1.294 david 572: <li><a href="errata33.html#isakmpd2"> March 17, 2004:
1.276 brad 573: Defects in the payload validation and processing functions of
574: isakmpd have been discovered. An attacker could send malformed
575: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.294 david 576: <li><a href="errata33.html#httpd2"> March 13, 2004:
1.275 brad 577: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
578: access module, using IP addresses without a netmask on big endian
579: 64-bit platforms causes the rules to fail to match.</a>
1.294 david 580: <li><a href="errata33.html#ip6"> February 8, 2004:
1.275 brad 581: An IPv6 MTU handling problem exists that could be used by an
582: attacker to cause a denial of service attack.</a>
1.294 david 583: <li><a href="errata33.html#sysvshm"> February 5, 2004:
1.271 millert 584: A reference counting bug in shmat(2) could be used to write to
585: kernel memory under certain circumstances.</a>
1.294 david 586: <li><a href="errata33.html#isakmpd">January 15, 2004:
1.268 brad 587: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 588: by Thomas Walpuski.</a>
1.294 david 589: <li><a href="errata33.html#ibcs2">November 17, 2003:
1.264 henning 590: It may be possible for a local user to execute arbitrary code
591: resulting in escalation of privileges due to a stack overrun
592: in compat_ibcs2(8).</a>
1.294 david 593: <li><a href="errata33.html#asn1">October 1, 2003:
1.257 millert 594: The use of certain ASN.1 encodings or malformed public keys may
595: allow an attacker to mount a denial of service attack against
596: applications linked with ssl(3).</a>
1.294 david 597: <li><a href="errata33.html#pfnorm">September 24, 2003:
1.258 beck 598: Access of freed memory in pf(4) could be used to
1.260 margarid 599: remotely panic a machine using scrub rules.</a>
1.294 david 600: <li><a href="errata33.html#sendmail">September 17, 2003:
1.256 millert 601: A buffer overflow in the address parsing in
602: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 603: <li><a href="errata33.html#sshbuffer">September 16, 2003:
1.255 millert 604: OpenSSH versions prior to 3.7 contains a buffer management error
605: that is potentially exploitable.</a>
1.294 david 606: <li><a href="errata33.html#sysvsem">September 10, 2003:
1.254 millert 607: Root may be able to reduce the security level by taking advantage of
608: an integer overflow when the semaphore limits are made very large.</a>
1.294 david 609: <li><a href="errata33.html#semget">August 20, 2003:
1.252 millert 610: An improper bounds check in the kernel may allow a local user
611: to panic the kernel.</a>
1.294 david 612: <li><a href="errata33.html#realpath">August 4, 2003:
1.249 millert 613: An off-by-one error exists in the C library function realpath(3)
614: may allow an attacker to gain escalated privileges.</a>
1.246 deraadt 615: </ul>
616:
1.265 miod 617:
1.247 david 618: <p>
1.246 deraadt 619: <li>
1.288 matthieu 620: <a name="32"></a>
1.224 deraadt 621:
1.294 david 622: <h3><font color="#e00000">OpenBSD 3.2 Security Advisories</font></h3>
1.224 deraadt 623: These are the OpenBSD 3.2 advisories -- all these problems are solved
1.294 david 624: in <a href="anoncvs.html">OpenBSD current</a>. The
625: <a href="stable.html">patch branch</a> for 3.2 is no longer being maintained,
1.265 miod 626: you should update your machine.
1.224 deraadt 627: <p>
628: <ul>
1.294 david 629: <li><a href="errata32.html#asn1">October 1, 2003:
1.257 millert 630: The use of certain ASN.1 encodings or malformed public keys may
631: allow an attacker to mount a denial of service attack against
632: applications linked with ssl(3). This does not affect OpenSSH.</a>
1.294 david 633: <li><a href="errata32.html#pfnorm">September 24, 2003:
1.258 beck 634: Access of freed memory in pf(4) could be used to
1.260 margarid 635: remotely panic a machine using scrub rules.</a>
1.294 david 636: <li><a href="errata32.html#sendmail4">September 17, 2003:
1.256 millert 637: A buffer overflow in the address parsing in
638: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 639: <li><a href="errata32.html#sshbuffer">September 16, 2003:
1.255 millert 640: OpenSSH versions prior to 3.7 contains a buffer management error
641: that is potentially exploitable.</a>
1.294 david 642: <li><a href="errata32.html#sendmail3">August 25, 2003:
1.253 brad 643: Fix for a potential security issue in
644: sendmail(8) with respect to DNS maps.</a>
1.294 david 645: <li><a href="errata32.html#realpath">August 4, 2003:
1.249 millert 646: An off-by-one error exists in the C library function realpath(3)
647: may allow an attacker to gain escalated privileges.</a>
1.294 david 648: <li><a href="errata32.html#sendmail2">March 31, 2003:
1.244 miod 649: A buffer overflow in the address parsing in
650: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 651: <li><a href="errata32.html#kerberos">March 24, 2003:
1.242 millert 652: A cryptographic weaknesses in the Kerberos v4 protocol can be
653: exploited on Kerberos v5 as well.</a>
1.294 david 654: <li><a href="errata32.html#kpr">March 19, 2003:
1.241 jufi 655: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 656: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.294 david 657: <li><a href="errata32.html#blinding">March 18, 2003:
1.239 miod 658: Various SSL and TLS operations in OpenSSL are vulnerable to
659: timing attacks.</a>
1.294 david 660: <li><a href="errata32.html#lprm">March 5, 2003:
1.238 millert 661: A buffer overflow in lprm(1) may allow an attacker to elevate
662: privileges to user daemon.</a>.
1.294 david 663: <li><a href="errata32.html#sendmail">March 3, 2003:
1.237 miod 664: A buffer overflow in the envelope comments processing in
665: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 666: <li><a href="errata32.html#httpd">February 25, 2003:
1.236 margarid 667: httpd(8) leaks file inode numbers via ETag header as well as
668: child PIDs in multipart MIME boundary generation. This could
669: lead, for example, to NFS exploitation because it uses inode
670: numbers as part of the file handle.</a>
1.294 david 671: <li><a href="errata32.html#ssl">February 22, 2003:
1.234 margarid 672: In ssl(8) an information leak can occur via timing by performing
673: a MAC computation even if incorrect block cipher padding has
674: been found, this is a countermeasure. Also, check for negative
675: sizes, in allocation routines.</a>
1.294 david 676: <li><a href="errata32.html#cvs">January 20, 2003:
1.232 millert 677: A double free exists in cvs(1) that could lead to privilege
678: escalation for cvs configurations where the cvs command is
1.233 margarid 679: run as a privileged user.</a>
1.294 david 680: <li><a href="errata32.html#named">November 14, 2002:
1.230 millert 681: A buffer overflow exists in named(8) that could lead to a
682: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 683: <li><a href="errata32.html#pool">November 6, 2002:
1.233 margarid 684: A logic error in the pool kernel memory allocator could cause
685: memory corruption in low-memory situations, causing the system
686: to crash.</a>
1.294 david 687: <li><a href="errata32.html#smrsh">November 6, 2002:
1.229 miod 688: An attacker can bypass smrsh(8)'s restrictions and execute
689: arbitrary commands with the privileges of his own account.</a>
1.294 david 690: <li><a href="errata32.html#pfbridge">November 6, 2002:
1.233 margarid 691: Network bridges running pf with scrubbing enabled could cause
692: mbuf corruption, causing the system to crash.</a>
1.294 david 693: <li><a href="errata32.html#kadmin">October 21, 2002:
1.228 miod 694: A buffer overflow can occur in the kadmind(8) daemon, leading
695: to possible remote crash or exploit.</a>
1.224 deraadt 696: </ul>
697:
1.227 miod 698: <p>
699: <li>
1.288 matthieu 700: <a name="31"></a>
1.203 deraadt 701:
1.294 david 702: <h3><font color="#e00000">OpenBSD 3.1 Security Advisories</font></h3>
1.203 deraadt 703: These are the OpenBSD 3.1 advisories -- all these problems are solved
1.294 david 704: in <a href="anoncvs.html">OpenBSD current</a>. The
705: <a href="stable.html">patch branch</a> for 3.1 is no longer being maintained,
1.258 beck 706: you should update your machine.
1.203 deraadt 707:
708: <p>
709: <ul>
1.294 david 710: <li><a href="errata31.html#sendmail2">March 31, 2003:
1.244 miod 711: A buffer overflow in the address parsing in
712: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 713: <li><a href="errata31.html#kerberos">March 24, 2003:
1.242 millert 714: A cryptographic weaknesses in the Kerberos v4 protocol can be
715: exploited on Kerberos v5 as well.</a>
1.294 david 716: <li><a href="errata31.html#kpr">March 19, 2003:
1.241 jufi 717: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 718: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.294 david 719: <li><a href="errata31.html#blinding">March 18, 2003:
1.239 miod 720: Various SSL and TLS operations in OpenSSL are vulnerable to
721: timing attacks.</a>
1.294 david 722: <li><a href="errata31.html#lprm">March 4, 2003:
1.238 millert 723: A buffer overflow in lprm(1) may allow an attacker to gain
724: root privileges.</a>
1.294 david 725: <li><a href="errata31.html#sendmail">March 3, 2003:
1.237 miod 726: A buffer overflow in the envelope comments processing in
727: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 728: <li><a href="errata31.html#ssl2">February 23, 2003:
1.235 miod 729: In ssl(8) an information leak can occur via timing by performing
730: a MAC computation even if incorrect block cipher padding has
731: been found, this is a countermeasure. Also, check for negative
732: sizes, in allocation routines.</a>
1.294 david 733: <li><a href="errata31.html#cvs">January 20, 2003:
1.232 millert 734: A double free exists in cvs(1) that could lead to privilege
735: escalation for cvs configurations where the cvs command is
1.294 david 736: run as a privileged user</a>.
737: <li><a href="errata31.html#named">November 14, 2002:
1.230 millert 738: A buffer overflow exists in named(8) that could lead to a
739: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 740: <li><a href="errata31.html#kernresource">November 6, 2002:
1.229 miod 741: Incorrect argument checking in the getitimer(2) system call
742: may allow an attacker to crash the system.</a>
1.294 david 743: <li><a href="errata31.html#smrsh">November 6, 2002:
1.229 miod 744: An attacker can bypass smrsh(8)'s restrictions and execute
745: arbitrary commands with the privileges of his own account.</a>
1.294 david 746: <li><a href="errata31.html#kadmin">October 21, 2002:
1.226 miod 747: A buffer overflow can occur in the kadmind(8) daemon, leading
748: to possible remote crash or exploit.</a>
1.294 david 749: <li><a href="errata31.html#kerntime">October 2, 2002:
1.222 jason 750: Incorrect argument checking in the setitimer(2) system call
751: may allow an attacker to write to kernel memory.</a>
1.294 david 752: <li><a href="errata31.html#scarg">August 11, 2002:
1.221 provos 753: An insufficient boundary check in the select system call
1.220 miod 754: allows an attacker to overwrite kernel memory and execute arbitrary code
755: in kernel context.</a>
1.294 david 756: <li><a href="errata31.html#ssl">July 30, 2002:
1.218 miod 757: Several remote buffer overflows can occur in the SSL2 server and SSL3
758: client of the ssl(8) library, as in the ASN.1 parser code in the
759: crypto(3) library, all of them being potentially remotely
760: exploitable.</a>
1.294 david 761: <li><a href="errata31.html#xdr">July 29, 2002:
1.218 miod 762: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
763: possible remote crash.</a>
1.294 david 764: <li><a href="errata31.html#pppd">July 29, 2002:
1.218 miod 765: A race condition exists in the pppd(8) daemon which may cause it to
766: alter the file permissions of an arbitrary file.</a>
1.294 david 767: <li><a href="errata31.html#isakmpd">July 5, 2002:
1.218 miod 768: Receiving IKE payloads out of sequence can cause isakmpd(8) to
769: crash.</a>
1.294 david 770: <li><a href="errata31.html#ktrace">June 27, 2002:
1.215 miod 771: The kernel would let any user ktrace set[ug]id processes.</a>
1.294 david 772: <li><a href="errata31.html#modssl">June 26, 2002:
1.213 miod 773: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 774: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.294 david 775: <li><a href="errata31.html#resolver">June 25, 2002:
1.212 millert 776: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 777: <li><a href="errata31.html#sshd">June 24, 2002:
1.216 deraadt 778: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 779: input validation error that can result in an integer overflow and
780: privilege escalation.</a>
1.294 david 781: <li><a href="errata31.html#httpd">June 19, 2002:
1.211 miod 782: A buffer overflow can occur during the interpretation of chunked
783: encoding in httpd(8), leading to possible remote crash.</a>
1.294 david 784: <li><a href="errata31.html#sshbsdauth">May 22, 2002:
1.209 markus 785: Under certain conditions, on systems using YP with netgroups
786: in the password database, it is possible that sshd(8) does
787: ACL checks for the requested user name but uses the password
788: database entry of a different user for authentication. This
789: means that denied users might authenticate successfully
790: while permitted users could be locked out.</a>
1.294 david 791: <li><a href="errata31.html#fdalloc2">May 8, 2002:
1.208 millert 792: A race condition exists that could defeat the kernel's
793: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 794: <li><a href="errata31.html#sudo">April 25, 2002:
1.205 millert 795: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 796: <li><a href="errata31.html#sshafs">April 22, 2002:
1.205 millert 797: A local user can gain super-user privileges due to a buffer
798: overflow in sshd(8) if AFS has been configured on the system
799: or if KerberosTgtPassing or AFSTokenPassing has been enabled
800: in the sshd_config file.</a>
1.203 deraadt 801: </ul>
802:
1.235 miod 803: <p>
1.203 deraadt 804: <li>
1.288 matthieu 805: <a name="30"></a>
1.187 deraadt 806:
1.294 david 807: <h3><font color="#e00000">OpenBSD 3.0 Security Advisories</font></h3>
1.187 deraadt 808: These are the OpenBSD 3.0 advisories -- all these problems are solved
1.294 david 809: in <a href="anoncvs.html">OpenBSD current</a>. The
810: <a href="stable.html">patch branch</a> for 3.0 is no longer being maintained,
1.258 beck 811: you should update your machine.
1.187 deraadt 812:
813: <p>
814: <ul>
1.294 david 815: <li><a href="errata30.html#named">November 14, 2002:
1.230 millert 816: A buffer overflow exists in named(8) that could lead to a
817: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 818: <li><a href="errata30.html#kernresource">November 6, 2002:
1.229 miod 819: Incorrect argument checking in the getitimer(2) system call
820: may allow an attacker to crash the system.</a>
1.294 david 821: <li><a href="errata30.html#smrsh">November 6, 2002:
1.229 miod 822: An attacker can bypass smrsh(8)'s restrictions and execute
823: arbitrary commands with the privileges of his own account.</a>
1.294 david 824: <li><a href="errata30.html#kadmin">October 21, 2002:
1.226 miod 825: A buffer overflow can occur in the kadmind(8) daemon, leading
826: to possible remote crash or exploit.</a>
1.294 david 827: <li><a href="errata30.html#kerntime">October 7, 2002:
1.223 miod 828: Incorrect argument checking in the setitimer(2) system call
829: may allow an attacker to write to kernel memory.</a>
1.294 david 830: <li><a href="errata30.html#scarg">August 11, 2002:
1.220 miod 831: An insufficient boundary check in the select and poll system calls
832: allows an attacker to overwrite kernel memory and execute arbitrary code
833: in kernel context.</a>
1.294 david 834: <li><a href="errata30.html#ssl">July 30, 2002:
1.218 miod 835: Several remote buffer overflows can occur in the SSL2 server and SSL3
836: client of the ssl(8) library, as in the ASN.1 parser code in the
837: crypto(3) library, all of them being potentially remotely
838: exploitable.</a>
1.294 david 839: <li><a href="errata30.html#xdr">July 29, 2002:
1.218 miod 840: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
841: possible remote crash.</a>
1.294 david 842: <li><a href="errata30.html#pppd">July 29, 2002:
1.218 miod 843: A race condition exists in the pppd(8) daemon which may cause it to
844: alter the file permissions of an arbitrary file.</a>
1.294 david 845: <li><a href="errata30.html#isakmpd2">July 5, 2002:
1.218 miod 846: Receiving IKE payloads out of sequence can cause isakmpd(8) to
847: crash.</a>
1.294 david 848: <li><a href="errata30.html#ktrace">June 27, 2002:
1.215 miod 849: The kernel would let any user ktrace set[ug]id processes.</a>
1.294 david 850: <li><a href="errata30.html#resolver">June 25, 2002:
1.212 millert 851: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 852: <li><a href="errata30.html#sshdauth">June 24, 2002:
1.216 deraadt 853: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 854: input validation error that can result in an integer overflow and
855: privilege escalation.</a>
1.294 david 856: <li><a href="errata30.html#modssl">June 24, 2002:
1.213 miod 857: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 858: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.294 david 859: <li><a href="errata30.html#httpd">June 19, 2002:
1.213 miod 860: A buffer overflow can occur during the interpretation of chunked
861: encoding in httpd(8), leading to possible remote crash.</a>
1.294 david 862: <li><a href="errata30.html#fdalloc2">May 8, 2002:
1.208 millert 863: A race condition exists that could defeat the kernel's
864: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 865: <li><a href="errata30.html#sudo2">April 25, 2002:
1.205 millert 866: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 867: <li><a href="errata30.html#sshafs">April 22, 2002:
1.205 millert 868: A local user can gain super-user privileges due to a buffer
869: overflow in sshd(8) if AFS has been configured on the system
870: or if KerberosTgtPassing or AFSTokenPassing has been enabled
871: in the sshd_config file.</a>
1.294 david 872: <li><a href="errata30.html#mail">April 11, 2002:
1.202 millert 873: The mail(1) was interpreting tilde escapes even when invoked
874: in non-interactive mode. As mail(1) is called as root from cron,
875: this can lead to a local root compromise.</a>
1.294 david 876: <li><a href="errata30.html#approval">March 19, 2002:
1.201 millert 877: Under certain conditions, on systems using YP with netgroups in
878: the password database, it is possible for the rexecd(8) and rshd(8)
879: daemons to execute a shell from a password database entry for a
880: different user. Similarly, atrun(8) may change to the wrong
881: home directory when running jobs.</a>
1.294 david 882: <li><a href="errata30.html#zlib">March 13, 2002:
1.200 millert 883: A potential double free() exists in the zlib library;
884: this is not exploitable on OpenBSD.
885: The kernel also contains a copy of zlib; it is not
886: currently known if the kernel zlib is exploitable.</a>
1.294 david 887: <li><a href="errata30.html#openssh">March 8, 2002:
1.198 millert 888: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 889: may allow a local user to gain super-user privileges.</a>
1.294 david 890: <li><a href="errata30.html#ptrace">January 21, 2002:
1.192 jason 891: A race condition between the ptrace(2) and execve(2) system calls
892: allows an attacker to modify the memory contents of suid/sgid
893: processes which could lead to compromise of the super-user account.</a>
1.294 david 894: <li><a href="errata30.html#sudo">January 17, 2002:
1.191 millert 895: There is a security hole in sudo(8) that can be exploited
896: when the Postfix sendmail replacement is installed that may
897: allow an attacker on the local host to gain root privileges.</a>
1.294 david 898: <li><a href="errata30.html#lpd">November 28, 2001:
1.189 millert 899: An attacker can trick a machine running the lpd daemon into
900: creating new files in the root directory from a machine with
901: remote line printer access.</a>
1.294 david 902: <li><a href="errata30.html#vi.recover">November 13, 2001:
1.188 millert 903: The vi.recover script can be abused in such a way as
904: to cause arbitrary zero-length files to be removed.</a>
1.294 david 905: <li><a href="errata30.html#pf">November 13, 2001:
1.190 mpech 906: pf(4) was incapable of dealing with certain ipv6 icmp packets,
907: resulting in a crash.</a>
1.294 david 908: <li><a href="errata30.html#sshd">November 12, 2001:
1.190 mpech 909: A security hole that may allow an attacker to partially authenticate
910: if -- and only if -- the administrator has enabled KerberosV.</a>
1.187 deraadt 911: </ul>
912:
913: <p>
914: <li>
1.288 matthieu 915: <a name="29"></a>
1.173 deraadt 916:
1.294 david 917: <h3><font color="#e00000">OpenBSD 2.9 Security Advisories</font></h3>
1.173 deraadt 918: These are the OpenBSD 2.9 advisories -- all these problems are solved
1.294 david 919: in <a href="anoncvs.html">OpenBSD current</a>. The
920: <a href="stable.html">patch branch</a>. for 2.9 is no longer being maintained,
1.258 beck 921: you should update your machine.
922:
1.173 deraadt 923:
924: <p>
925: <ul>
1.294 david 926: <li><a href="errata29.html#resolver">June 25, 2002:
1.212 millert 927: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 928: <li><a href="errata29.html#fdalloc2">May 8, 2002:
1.208 millert 929: A race condition exists that could defeat the kernel's
930: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 931: <li><a href="errata29.html#sudo2">April 25, 2002:
1.207 millert 932: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 933: <li><a href="errata29.html#sshafs">April 22, 2002:
1.206 millert 934: A local user can gain super-user privileges due to a buffer
935: overflow in sshd(8) if AFS has been configured on the system
936: or if KerberosTgtPassing or AFSTokenPassing has been enabled
937: in the sshd_config file.</a>
1.294 david 938: <li><a href="errata29.html#mail">April 11, 2002:
1.202 millert 939: The mail(1) was interpreting tilde escapes even when invoked
940: in non-interactive mode. As mail(1) is called as root from cron,
941: this can lead to a local root compromise.</a>
1.294 david 942: <li><a href="errata29.html#zlib">March 13, 2002:
1.200 millert 943: A potential double free() exists in the zlib library;
944: this is not exploitable on OpenBSD.
945: The kernel also contains a copy of zlib; it is not
946: currently known if the kernel zlib is exploitable.</a>
1.294 david 947: <li><a href="errata29.html#openssh">March 8, 2002:
1.198 millert 948: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 949: may allow a local user to gain super-user privileges.</a>
1.294 david 950: <li><a href="errata29.html#ptrace">January 21, 2002:
1.198 millert 951: A race condition between the ptrace(2) and execve(2) system calls
952: allows an attacker to modify the memory contents of suid/sgid
953: processes which could lead to compromise of the super-user account.</a>
1.294 david 954: <li><a href="errata29.html#sudo">January 17, 2002:
1.191 millert 955: There is a security hole in sudo(8) that can be exploited
956: when the Postfix sendmail replacement is installed that may
957: allow an attacker on the local host to gain root privileges.</a>
1.294 david 958: <li><a href="errata29.html#lpd2">November 28, 2001:
1.189 millert 959: An attacker can trick a machine running the lpd daemon into
960: creating new files in the root directory from a machine with
961: remote line printer access.</a>
1.294 david 962: <li><a href="errata29.html#vi.recover">November 13, 2001:
1.190 mpech 963: The vi.recover script can be abused in such a way as
964: to cause arbitrary zero-length files to be removed.</a>
1.294 david 965: <li><a href="errata29.html#uucp">September 11, 2001:
1.184 millert 966: A security hole exists in uuxqt(8) that may allow an
967: attacker to gain root privileges.</a>
1.294 david 968: <li><a href="errata29.html#lpd">August 29, 2001:
1.183 millert 969: A security hole exists in lpd(8) that may allow an
970: attacker to gain root privileges if lpd is running.</a>
1.294 david 971: <li><a href="errata29.html#sendmail2">August 21, 2001:
1.181 millert 972: A security hole exists in sendmail(8) that may allow an
973: attacker on the local host to gain root privileges.</a>
1.294 david 974: <li><a href="errata29.html#nfs">July 30, 2001:
1.180 jason 975: A kernel buffer overflow in the NFS code can be used to execute
976: arbitrary code by users with mount privileges (only root by
1.181 millert 977: default).</a>
1.294 david 978: <li><a href="errata29.html#kernexec">June 15, 2001:
1.178 aaron 979: A race condition in the kernel can lead to local root compromise.</a>
1.294 david 980: <li><a href="errata29.html#sshcookie">June 12, 2001:
1.177 markus 981: sshd(8) allows users to delete arbitrary files named "cookies"
982: if X11 forwarding is enabled. X11 forwarding is disabled
983: by default.</a>
1.294 david 984: <li><a href="errata29.html#fts">May 30, 2001:
1.176 millert 985: Programs using the fts routines can be tricked into changing
986: into the wrong directory.</a>
1.294 david 987: <li><a href="errata29.html#sendmail">May 29, 2001:
1.174 millert 988: Sendmail signal handlers contain unsafe code,
989: leading to numerous race conditions.</a>
1.173 deraadt 990: </ul>
991:
992: <p>
993: <li>
1.288 matthieu 994: <a name="28"></a>
1.152 deraadt 995:
1.294 david 996: <h3><font color="#e00000">OpenBSD 2.8 Security Advisories</font></h3>
1.152 deraadt 997: These are the OpenBSD 2.8 advisories -- all these problems are solved
1.294 david 998: in <a href="anoncvs.html">OpenBSD current</a>. The
999: <a href="stable.html">patch branch</a>. for 2.8 is no longer being maintained,
1.258 beck 1000: you should update your machine.
1001:
1.152 deraadt 1002:
1003: <p>
1004: <ul>
1.294 david 1005: <li><a href="errata28.html#uucp">September 11, 2001:
1.184 millert 1006: A security hole exists in uuxqt(8) that may allow an
1007: attacker to gain root privileges.</a>
1.294 david 1008: <li><a href="errata28.html#lpd">August 29, 2001:
1.183 millert 1009: A security hole exists in lpd(8) that may allow an
1010: attacker to gain root privileges if lpd is running.</a>
1.294 david 1011: <li><a href="errata28.html#sendmail2">August 21, 2001:
1.181 millert 1012: A security hole exists in sendmail(8) that may allow an
1013: attacker on the local host to gain root privileges.</a>
1.294 david 1014: <li><a href="errata28.html#kernexec">June 15, 2001:
1.178 aaron 1015: A race condition in the kernel can lead to local root compromise.</a>
1.294 david 1016: <li><a href="errata28.html#fts">May 30, 2001:
1.176 millert 1017: Programs using the fts routines can be tricked into changing
1018: into the wrong directory.</a>
1.294 david 1019: <li><a href="errata28.html#sendmail">May 29, 2001:
1.175 millert 1020: Sendmail signal handlers contain unsafe code,
1021: leading to numerous race conditions.</a>
1.294 david 1022: <li><a href="errata28.html#ipf_frag">Apr 23, 2001:
1.231 mickey 1023: IPF contains a serious bug with its handling of fragment caching.</a>
1.294 david 1024: <li><a href="errata28.html#glob_limit">Apr 23, 2001:
1.172 ericj 1025: ftpd(8) contains a potential DoS relating to glob(3).</a>
1.294 david 1026: <li><a href="errata28.html#glob">Apr 10, 2001:
1.170 ericj 1027: The glob(3) library call contains multiple buffer overflows.</a>
1.294 david 1028: <li><a href="errata28.html#readline">Mar 18, 2001:
1.169 millert 1029: The readline library creates history files with permissive modes based on the user's umask.</a>
1.294 david 1030: <li><a href="errata28.html#ipsec_ah">Mar 2, 2001:
1.167 ericj 1031: Insufficient checks in the IPSEC AH IPv4 option handling code can lead to a buffer overrun in the kernel.</a>
1.294 david 1032: <li><a href="errata28.html#userldt">Mar 2, 2001:
1.168 horacio 1033: The <b>USER_LDT</b> kernel option allows an attacker to gain access to privileged areas of kernel memory.</a>
1.294 david 1034: <li><a href="errata28.html#sudo">Feb 22, 2001:
1.171 millert 1035: a non-exploitable buffer overflow was fixed in sudo(8).</a>
1.294 david 1036: <li><a href="errata28.html#named">Jan 29, 2001:
1.163 jason 1037: merge named(8) with ISC BIND 4.9.8-REL, which fixes some buffer vulnerabilities.</a>
1.294 david 1038: <li><a href="errata28.html#rnd">Jan 22, 2001:
1.162 jason 1039: rnd(4) did not use all of its input when written to.</a>
1.294 david 1040: <li><a href="errata28.html#xlock">Dec 22, 2000:
1.159 ericj 1041: xlock(1)'s authentication was re-done to authenticate via a named pipe. (patch and new xlock binaries included).</a>
1.294 david 1042: <li><a href="errata28.html#procfs">Dec 18, 2000:
1.157 ericj 1043: Procfs contains numerous overflows. Procfs is not used by default in OpenBSD. (patch included).</a>
1.294 david 1044: <li><a href="errata28.html#kerberos2">Dec 10, 2000:
1.156 deraadt 1045: Another problem exists in KerberosIV libraries (patch included).</a>
1.294 david 1046: <li><a href="errata28.html#kerberos">Dec 7, 2000:
1.155 deraadt 1047: A set of problems in KerberosIV exist (patch included).</a>
1.294 david 1048: <li><a href="errata28.html#ftpd">Dec 4, 2000:
1.154 millert 1049: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.152 deraadt 1050: </ul>
1051:
1052: <p>
1053: <li>
1.288 matthieu 1054: <a name="27"></a>
1.124 deraadt 1055:
1.294 david 1056: <h3><font color="#e00000">OpenBSD 2.7 Security Advisories</font></h3>
1.124 deraadt 1057: These are the OpenBSD 2.7 advisories -- all these problems are solved
1.294 david 1058: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.124 deraadt 1059: OpenBSD 2.6 advisories listed below are fixed in OpenBSD 2.7.
1060:
1061: <p>
1062: <ul>
1.294 david 1063: <li><a href="errata27.html#readline">Mar 18, 2001:
1.169 millert 1064: The readline library creates history files with permissive modes based on the user's umask.</a>
1.294 david 1065: <li><a href="errata27.html#sudo">Feb 22, 2001:
1.169 millert 1066: a buffer overflow was fixed in sudo(8).</a>
1.294 david 1067: <li><a href="errata27.html#ftpd">Dec 4, 2000:
1.154 millert 1068: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.294 david 1069: <li><a href="errata27.html#sshforwarding">Nov 10, 2000:
1.152 deraadt 1070: Hostile servers can force OpenSSH clients to do agent or X11 forwarding.
1071: (patch included)</a>
1.294 david 1072: <li><a href="errata27.html#xtrans">Oct 26, 2000:
1.151 matthieu 1073: X11 libraries have 2 potential overflows in xtrans code.
1074: (patch included)</a>
1.294 david 1075: <li><a href="errata27.html#httpd">Oct 18, 2000:
1.150 beck 1076: Apache mod_rewrite and mod_vhost_alias modules could expose files
1077: on the server in certain configurations if used.
1078: (patch included)</a>
1.294 david 1079: <li><a href="errata27.html#telnetd">Oct 10, 2000:
1.149 millert 1080: The telnet daemon does not strip out the TERMINFO, TERMINFO_DIRS,
1081: TERMPATH and TERMCAP environment variables as it should.
1082: (patch included)</a>
1.294 david 1083: <li><a href="errata27.html#format_strings">Oct 6, 2000:
1.148 millert 1084: There are printf-style format string bugs in several privileged
1085: programs. (patch included)</a>
1.294 david 1086: <li><a href="errata27.html#curses">Oct 6, 2000:
1.147 millert 1087: libcurses honored terminal descriptions in the $HOME/.terminfo
1088: directory as well as in the TERMCAP environment variable for
1089: setuid and setgid applications.
1.146 deraadt 1090: (patch included)</a>
1.294 david 1091: <li><a href="errata27.html#talkd">Oct 6, 2000:
1.146 deraadt 1092: A format string vulnerability exists in talkd(8).
1093: (patch included)</a>
1.294 david 1094: <li><a href="errata27.html#pw_error">Oct 3, 2000:
1.145 aaron 1095: A format string vulnerability exists in the pw_error() function of the
1096: libutil library, yielding localhost root through chpass(1).
1097: (patch included)</a>
1.294 david 1098: <li><a href="errata27.html#ipsec">Sep 18, 2000:
1.144 jason 1099: Bad ESP/AH packets could cause a crash under certain conditions.
1100: (patch included)</a>
1.294 david 1101: <li><a href="errata27.html#xlock">Aug 16, 2000:
1.141 deraadt 1102: A format string vulnerability (localhost root) exists in xlock(1).
1103: (patch included)</a>
1.294 david 1104: <li><a href="errata27.html#X11_libs">July 14, 2000:
1.139 deraadt 1105: Various bugs found in X11 libraries have various side effects, almost
1106: completely denial of service in OpenBSD.
1107: (patch included)</a>
1.294 david 1108: <li><a href="errata27.html#ftpd">July 5, 2000:
1.136 deraadt 1109: Just like pretty much all the other unix ftp daemons
1110: on the planet, ftpd had a remote root hole in it.
1111: Luckily, ftpd was not enabled by default.
1.137 deraadt 1112: The problem exists if anonymous ftp is enabled.
1.136 deraadt 1113: (patch included)</a>
1.294 david 1114: <li><a href="errata27.html#mopd">July 5, 2000:
1.136 deraadt 1115: Mopd, very rarely used, contained some buffer overflows.
1116: (patch included)</a>
1.294 david 1117: <li><a href="errata27.html#libedit">June 28, 2000:
1.135 deraadt 1118: libedit would check for a <b>.editrc</b> file in the current
1119: directory. Not known to be a real security issue, but a patch
1120: is available anyways.
1121: (patch included)</a>
1.294 david 1122: <li><a href="errata27.html#dhclient">June 24, 2000:
1.134 deraadt 1123: A serious bug in dhclient(8) could allow strings from a
1124: malicious dhcp server to be executed in the shell as root.
1125: (patch included)</a>
1.294 david 1126: <li><a href="errata27.html#isakmpd">June 9, 2000:
1.133 deraadt 1127: A serious bug in isakmpd(8) policy handling wherein
1128: policy verification could be completely bypassed in isakmpd.
1129: (patch included)</a>
1.294 david 1130: <li><a href="errata27.html#uselogin">June 6, 2000:
1.132 deraadt 1131: The non-default flag UseLogin in <b>/etc/sshd_config</b> is broken,
1132: should not be used, and results in security problems on
1133: other operating systems.</a>
1.294 david 1134: <li><a href="errata27.html#bridge">May 26, 2000:
1.129 deraadt 1135: The bridge(4) <i>learning</i> flag may be bypassed.
1.128 deraadt 1136: (patch included)</a>
1.294 david 1137: <li><a href="errata27.html#ipf">May 25, 2000:
1.127 kjell 1138: Improper use of ipf <i>keep-state</i> rules can result
1139: in firewall rules being bypassed. (patch included)</a>
1140:
1.124 deraadt 1141: </ul>
1142:
1143: <p>
1144: <li>
1.288 matthieu 1145: <a name="26"></a>
1.119 deraadt 1146:
1.294 david 1147: <h3><font color="#e00000">OpenBSD 2.6 Security Advisories</font></h3>
1.119 deraadt 1148: These are the OpenBSD 2.6 advisories -- all these problems are solved
1.294 david 1149: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.119 deraadt 1150: OpenBSD 2.5 advisories listed below are fixed in OpenBSD 2.6.
1151:
1152: <p>
1153: <ul>
1.294 david 1154: <li><a href="errata26.html#semconfig">May 26, 2000:
1.130 deraadt 1155: SYSV semaphore support contained an undocumented system call
1.131 deraadt 1156: which could wedge semaphore-using processes from exiting. (patch included)</a>
1.294 david 1157: <li><a href="errata26.html#ipf">May 25, 2000:
1.127 kjell 1158: Improper use of ipf <i>keep-state</i> rules can result
1159: in firewall rules being bypassed. (patch included)</a>
1.294 david 1160: <li><a href="errata26.html#xlockmore">May 25, 2000:
1.125 deraadt 1161: xlockmore has a bug which a localhost attacker can use to gain
1162: access to the encrypted root password hash (which is normally
1.245 miod 1163: encoded using blowfish</a> (see
1.294 david 1164: <a href="http://www.openbsd.org/cgi-bin/man.cgi?query=crypt&sektion=3">
1.125 deraadt 1165: crypt(3)</a>)
1.245 miod 1166: (patch included).
1.294 david 1167: <li><a href="errata26.html#procfs">Jan 20, 2000:
1.123 deraadt 1168: Systems running with procfs enabled and mounted are
1169: vulnerable to a very tricky exploit. procfs is not
1170: mounted by default.
1171: (patch included).</a>
1.294 david 1172: <li><a href="errata26.html#sendmail">Dec 4, 1999:
1.296 david 1173: Sendmail permitted any user to cause an aliases file wrap,
1.190 mpech 1174: thus exposing the system to a race where the aliases file
1175: did not exist.
1.119 deraadt 1176: (patch included).</a>
1.294 david 1177: <li><a href="errata26.html#poll">Dec 4, 1999:
1.190 mpech 1178: Various bugs in poll(2) may cause a kernel crash.</a>
1.294 david 1179: <li><a href="errata26.html#sslUSA">Dec 2, 1999:
1.120 deraadt 1180: A buffer overflow in the RSAREF code included in the
1181: USA version of libssl, is possibly exploitable in
1182: httpd, ssh, or isakmpd, if SSL/RSA features are enabled.
1.124 deraadt 1183: (patch included).<br></a>
1184: <strong>Update:</strong> Turns out that this was not exploitable
1185: in any of the software included in OpenBSD 2.6.
1.294 david 1186: <li><a href="errata26.html#ifmedia">Nov 9, 1999:
1.190 mpech 1187: Any user could change interface media configurations, resulting in
1188: a localhost denial of service attack.
1.121 deraadt 1189: (patch included).</a>
1.119 deraadt 1190: </ul>
1191:
1192: <p>
1193: <li>
1.288 matthieu 1194: <a name="25"></a>
1.106 deraadt 1195:
1.294 david 1196: <h3><font color="#e00000">OpenBSD 2.5 Security Advisories</font></h3>
1.93 deraadt 1197: These are the OpenBSD 2.5 advisories -- all these problems are solved
1.294 david 1198: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.93 deraadt 1199: OpenBSD 2.4 advisories listed below are fixed in OpenBSD 2.5.
1200:
1.96 deraadt 1201: <p>
1.104 deraadt 1202: <ul>
1.294 david 1203: <li><a href="errata25.html#cron">Aug 30, 1999:
1.103 deraadt 1204: In cron(8), make sure argv[] is NULL terminated in the
1205: fake popen() and run sendmail as the user, not as root.
1206: (patch included).</a>
1.294 david 1207: <li><a href="errata25.html#miscfs">Aug 12, 1999: The procfs and fdescfs
1.101 deraadt 1208: filesystems had an overrun in their handling of uio_offset
1209: in their readdir() routines. (These filesystems are not
1210: enabled by default). (patch included).</a>
1.294 david 1211: <li><a href="errata25.html#profil">Aug 9, 1999: Stop profiling (see profil(2))
1.100 deraadt 1212: when we execve() a new process. (patch included).</a>
1.294 david 1213: <li><a href="errata25.html#ipsec_in_use">Aug 6, 1999: Packets that should have
1.98 deraadt 1214: been handled by IPsec may be transmitted as cleartext.
1215: PF_KEY SA expirations may leak kernel resources.
1216: (patch included).</a>
1.294 david 1217: <li><a href="errata25.html#rc">Aug 5, 1999: In /etc/rc, use mktemp(1) for
1.97 deraadt 1218: motd re-writing and change the find(1) to use -execdir
1219: (patch included).</a>
1.294 david 1220: <li><a href="errata25.html#chflags">Jul 30, 1999: Do not permit regular
1.95 deraadt 1221: users to chflags(2) or fchflags(2) on character or block devices
1222: which they may currently be the owner of (patch included).</a>
1.294 david 1223: <li><a href="errata25.html#nroff">Jul 27, 1999: Cause groff(1) to be invoked
1.95 deraadt 1224: with the -S flag, when called by nroff(1) (patch included).</a>
1.93 deraadt 1225: </ul>
1226:
1.106 deraadt 1227: <p>
1228: <li>
1.288 matthieu 1229: <a name="24"></a>
1.235 miod 1230:
1.294 david 1231: <h3><font color="#e00000">OpenBSD 2.4 Security Advisories</font></h3>
1.75 deraadt 1232: These are the OpenBSD 2.4 advisories -- all these problems are solved
1.294 david 1233: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.75 deraadt 1234: OpenBSD 2.3 advisories listed below are fixed in OpenBSD 2.4.
1235:
1.96 deraadt 1236: <p>
1.75 deraadt 1237: <ul>
1.294 david 1238: <li><a href="errata24.html#poll">Mar 22, 1999: The nfds argument for poll(2) needs
1.91 deraadt 1239: to be constrained, to avoid kvm starvation (patch included).</a>
1.294 david 1240: <li><a href="errata24.html#tss">Mar 21, 1999: A change in TSS handling stops
1.91 deraadt 1241: another kernel crash case caused by the <strong>crashme</strong>
1242: program (patch included).</a>
1.294 david 1243: <li><a href="errata24.html#nlink">Feb 25, 1999: An unbounded increment on the
1.90 deraadt 1244: nlink value in FFS and EXT2FS filesystems can cause a system crash.
1.89 deraadt 1245: (patch included).</a>
1.294 david 1246: <li><a href="errata24.html#ping">Feb 23, 1999: Yet another buffer overflow
1.88 deraadt 1247: existed in ping(8). (patch included).</a>
1.294 david 1248: <li><a href="errata24.html#ipqrace">Feb 19, 1999: ipintr() had a race in use of
1.87 deraadt 1249: the ipq, which could permit an attacker to cause a crash.
1250: (patch included).</a>
1.294 david 1251: <li><a href="errata24.html#accept">Feb 17, 1999: A race condition in the
1.86 deraadt 1252: kernel between accept(2) and select(2) could permit an attacker
1253: to hang sockets from remote.
1254: (patch included).</a>
1.294 david 1255: <li><a href="errata24.html#maxqueue">Feb 17, 1999: IP fragment assembly can
1.85 deraadt 1256: bog the machine excessively and cause problems.
1257: (patch included).</a>
1.294 david 1258: <li><a href="errata24.html#trctrap">Feb 12, 1999: i386 T_TRCTRAP handling and
1.84 deraadt 1259: DDB interacted to possibly cause a crash.
1260: (patch included).</a>
1.294 david 1261: <li><a href="errata24.html#rst">Feb 11, 1999: TCP/IP RST handling was sloppy.
1.83 deraadt 1262: (patch included).</a>
1.294 david 1263: <li><a href="errata24.html#bootpd">Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 1264: problem in bootpd(8). (patch included).</a>
1.294 david 1265: <li><a href="errata24.html#termcap">Nov 19, 1998: There is a possibly locally
1.82 deraadt 1266: exploitable problem relating to environment variables in termcap
1267: and curses. (patch included).</a>
1.294 david 1268: <li><a href="errata24.html#tcpfix">Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 1269: bug in the TCP decoding kernel. (patch included).</a>
1.75 deraadt 1270: </ul>
1271:
1.106 deraadt 1272: <p>
1273: <li>
1.288 matthieu 1274: <a name="23"></a>
1.235 miod 1275:
1.294 david 1276: <h3><font color="#e00000">OpenBSD 2.3 Security Advisories</font></h3>
1.73 deraadt 1277: These are the OpenBSD 2.3 advisories -- all these problems are solved
1.294 david 1278: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.73 deraadt 1279: OpenBSD 2.2 advisories listed below are fixed in OpenBSD 2.3.
1.53 matthieu 1280:
1.96 deraadt 1281: <p>
1.53 matthieu 1282: <ul>
1.294 david 1283: <li><a href="errata23.html#bootpd">Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 1284: problem in bootpd(8). (patch included).</a>
1.294 david 1285: <li><a href="errata23.html#tcpfix">Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 1286: bug in the TCP decoding kernel. (patch included).</a>
1.294 david 1287: <li><a href="errata23.html#resolver">August 31, 1998: A benign looking resolver
1.190 mpech 1288: buffer overflow bug was re-introduced accidentally (patches included).</a>
1.294 david 1289: <li><a href="errata23.html#chpass">Aug 2, 1998:
1.190 mpech 1290: chpass(1) has a file descriptor leak which allows an
1291: attacker to modify /etc/master.passwd.</a>
1.294 david 1292: <li><a href="errata23.html#inetd">July 15, 1998: Inetd had a file descriptor leak.</a>
1293: <li><a href="errata23.html#fdalloc">Jul 2, 1998: setuid and setgid processes
1.72 deraadt 1294: should not be executed with fd slots 0, 1, or 2 free.
1295: (patch included).</a>
1.294 david 1296: <li><a href="errata23.html#xlib">June 6, 1998: Further problems with the X
1.71 deraadt 1297: libraries (patches included).</a>
1.294 david 1298: <li><a href="errata23.html#kill">May 17, 1998: kill(2) of setuid/setgid target
1.66 deraadt 1299: processes too permissive (4th revision patch included).</a>
1.294 david 1300: <li><a href="errata23.html#immutable">May 11, 1998: mmap() permits partial bypassing
1.60 deraadt 1301: of immutable and append-only file flags. (patch included).</a>
1.294 david 1302: <li><a href="errata23.html#ipsec">May 5, 1998: Incorrect handling of IPSEC packets
1.190 mpech 1303: if IPSEC is enabled (patch included).</a>
1.294 david 1304: <li><a href="errata23.html#xterm-xaw">May 1, 1998: Buffer overflow in xterm and Xaw
1.58 deraadt 1305: (CERT advisory VB-98.04) (patch included).</a>
1.53 matthieu 1306: </ul>
1.9 deraadt 1307:
1.106 deraadt 1308: <p>
1309: <li>
1.288 matthieu 1310: <a name="22"></a>
1.235 miod 1311:
1.294 david 1312: <h3><font color="#e00000">OpenBSD 2.2 Security Advisories</font></h3>
1.45 deraadt 1313: These are the OpenBSD 2.2 advisories. All these problems are solved
1.294 david 1314: in <a href="23.html">OpenBSD 2.3</a>. Some of these problems
1.45 deraadt 1315: still exist in other operating systems. (The supplied patches are for
1316: OpenBSD 2.2; they may or may not work on OpenBSD 2.1).
1.9 deraadt 1317:
1.96 deraadt 1318: <p>
1.9 deraadt 1319: <ul>
1.294 david 1320: <li><a href="errata22.html#ipsec">May 5, 1998: Incorrect handling of IPSEC
1.72 deraadt 1321: packets if IPSEC is enabled (patch included).</a>
1.294 david 1322: <li><a href="errata22.html#xterm-xaw">May 1, 1998: Buffer overflow in xterm
1.72 deraadt 1323: and Xaw (CERT advisory VB-98.04) (patch included).</a>
1.294 david 1324: <li><a href="errata22.html#uucpd">Apr 22, 1998: Buffer overflow in uucpd
1.72 deraadt 1325: (patch included).</a>
1.294 david 1326: <li><a href="errata22.html#rmjob">Apr 22, 1998: Buffer mismanagement in lprm
1.72 deraadt 1327: (patch included).</a>
1.294 david 1328: <li><a href="errata22.html#ping">Mar 31, 1998: Overflow in ping -R (patch included).</a>
1329: <li><a href="errata22.html#named">Mar 30, 1998: Overflow in named fake-iquery
1.59 deraadt 1330: (patch included).</a>
1.294 david 1331: <li><a href="errata22.html#mountd">Mar 2, 1998: Accidental NFS filesystem
1.72 deraadt 1332: export (patch included).</a>
1.112 philen 1333: <li><a href="advisories/mmap.txt">Feb 26, 1998: Read-write mmap() flaw.</a>
1.294 david 1334: Revision 3 of the patch is available <a href="errata22.html#mmap">here</a>
1.112 philen 1335: <li><a href="advisories/sourceroute.txt">Feb 19, 1998: Sourcerouted Packet
1.59 deraadt 1336: Acceptance.</a>
1.294 david 1337: A patch is available <a href="errata22.html#sourceroute">here</a>.
1338: <li><a href="errata22.html#ruserok">Feb 13, 1998: Setuid coredump & Ruserok()
1.72 deraadt 1339: flaw (patch included).</a>
1.294 david 1340: <li><a href="errata22.html#ldso">Feb 9, 1998: MIPS ld.so flaw (patch included).</a>
1.1 deraadt 1341: </ul>
1342:
1.106 deraadt 1343: <p>
1344: <li>
1.288 matthieu 1345: <a name="21"></a>
1.235 miod 1346:
1.294 david 1347: <h3><font color="#e00000">OpenBSD 2.1 Security Advisories</font></h3>
1.52 deraadt 1348: These are the OpenBSD 2.1 advisories. All these problems are solved
1.294 david 1349: in <a href="22.html">OpenBSD 2.2</a>. Some of these problems still
1.52 deraadt 1350: exist in other operating systems. (If you are running OpenBSD 2.1, we
1351: would strongly recommend an upgrade to the newest release, as this
1352: patch list only attempts at fixing the most important security
1353: problems. In particular, OpenBSD 2.2 fixes numerous localhost
1354: security problems. Many of those problems were solved in ways which
1355: make it hard for us to provide patches).
1356:
1.96 deraadt 1357: <p>
1.52 deraadt 1358: <ul>
1.112 philen 1359: <li><a href="advisories/signals.txt">Sep 15, 1997: Deviant Signals (patch included)</a>
1360: <li><a href="advisories/rfork.txt">Aug 2, 1997: Rfork() system call flaw
1.59 deraadt 1361: (patch included)</a>
1.112 philen 1362: <li><a href="advisories/procfs.txt">Jun 24, 1997: Procfs flaws (patch included)</a>
1.52 deraadt 1363: </ul>
1.51 deraadt 1364:
1.106 deraadt 1365: <p>
1366: <li>
1.288 matthieu 1367: <a name="20"></a>
1.235 miod 1368:
1.294 david 1369: <h3><font color="#e00000">OpenBSD 2.0 Security Advisories</font></h3>
1.99 deraadt 1370: These are the OpenBSD 2.0 advisories. All these problems are solved
1.294 david 1371: in <a href="21.html">OpenBSD 2.1</a>. Some of these problems still
1.99 deraadt 1372: exist in other operating systems. (If you are running OpenBSD 2.0, we
1373: commend you for being there back in the old days!, but you're really
1374: missing out if you don't install a new version!)
1375:
1376: <p>
1377: <ul>
1.112 philen 1378: <li><a href="advisories/res_random.txt">April 22, 1997: Predictable IDs in the
1.99 deraadt 1379: resolver (patch included)</a>
1380: <li>Many others... if people can hunt them down, please let me know
1381: and we'll put them up here.
1382: </ul>
1.51 deraadt 1383: <p>
1.106 deraadt 1384:
1.288 matthieu 1385: <a name="watching"></a>
1.294 david 1386: <li><h3><font color="#e00000">Watching our Changes</font></h3><p>
1.106 deraadt 1387:
1.21 deraadt 1388: Since we take a proactive stance with security, we are continually
1389: finding and fixing new security problems. Not all of these problems
1.80 espie 1390: get widely reported because (as stated earlier) many of them are not
1.45 deraadt 1391: confirmed to be exploitable; many simple bugs we fix do turn out to
1392: have security consequences we could not predict. We do not have the
1393: time resources to make these changes available in the above format.<p>
1.21 deraadt 1394:
1395: Thus there are usually minor security fixes in the current source code
1396: beyond the previous major OpenBSD release. We make a limited
1.45 deraadt 1397: guarantee that these problems are of minimal impact and unproven
1.44 ian 1398: exploitability. If we discover that a problem definitely matters for
1.45 deraadt 1399: security, patches will show up here <strong>VERY</strong> quickly.<p>
1.21 deraadt 1400:
1.45 deraadt 1401: People who are really concerned with security can do a number of
1402: things:<p>
1.21 deraadt 1403:
1404: <ul>
1405: <li>If you understand security issues, watch our
1.294 david 1406: <a href="mail.html">source-changes mailing list</a> and keep an
1.23 deraadt 1407: eye out for things which appear security related. Since
1.21 deraadt 1408: exploitability is not proven for many of the fixes we make,
1409: do not expect the relevant commit message to say "SECURITY FIX!".
1410: If a problem is proven and serious, a patch will be available
1411: here very shortly after.
1.161 horacio 1412: <li>In addition to source changes, you can watch our <a href="mail.html">
1.160 ericj 1413: security-announce mailing list</a> which will notify you for every
1.186 ian 1414: security related item that the OpenBSD team deems as a possible threat,
1.160 ericj 1415: and instruct you on how to patch the problem.
1.21 deraadt 1416: <li>Track our current source code tree, and teach yourself how to do a
1.29 deraadt 1417: complete system build from time to time (read /usr/src/Makefile
1418: carefully). Users can make the assumption that the current
1419: source tree always has stronger security than the previous release.
1.45 deraadt 1420: However, building your own system from source code is not trivial;
1.265 miod 1421: it is nearly 600MB of source code, and problems do occur as we
1.45 deraadt 1422: transition between major releases.
1.115 ericj 1423: <li>Install a binary snapshot for your
1.80 espie 1424: architecture, which are made available fairly often. For
1.29 deraadt 1425: instance, an i386 snapshot is typically made available weekly.
1.21 deraadt 1426: </ul>
1427:
1.9 deraadt 1428: <p>
1.288 matthieu 1429: <a name="reporting"></a>
1.294 david 1430: <li><h3><font color="#e00000">Reporting problems</font></h3><p>
1.3 deraadt 1431:
1.5 deraadt 1432: <p> If you find a new security problem, you can mail it to
1.294 david 1433: <a href="mailto:deraadt@openbsd.org">deraadt@openbsd.org</a>.
1.7 deraadt 1434: <br>
1.5 deraadt 1435: If you wish to PGP encode it (but please only do so if privacy is very
1.112 philen 1436: urgent, since it is inconvenient) use this <a href="advisories/pgpkey.txt">pgp key</a>.
1.5 deraadt 1437:
1.107 deraadt 1438: <p>
1.288 matthieu 1439: <a name="papers"></a>
1.294 david 1440: <li><h3><font color="#e00000">Further Reading</font></h3><p>
1.107 deraadt 1441:
1442: A number of papers have been written by OpenBSD team members, about security
1443: related changes they have done in OpenBSD. The postscript versions of these
1.108 deraadt 1444: documents are available as follows.<p>
1.107 deraadt 1445:
1446: <ul>
1.113 deraadt 1447: <li>A Future-Adaptable Password Scheme.<br>
1.294 david 1448: <a href="events.html#usenix99">Usenix 1999</a>,
1449: by <a href="mailto:provos@openbsd.org">Niels Provos</a>,
1450: <a href="mailto:dm@openbsd.org">David Mazieres</a>.<br>
1451: <a href="papers/bcrypt-paper.ps">paper</a> and
1452: <a href="papers/bcrypt-slides.ps">slides</a>.
1.113 deraadt 1453: <p>
1454: <li>Cryptography in OpenBSD: An Overview.<br>
1.294 david 1455: <a href="events.html#usenix99">Usenix 1999</a>,
1456: by <a href="mailto:deraadt@openbsd.org">Theo de Raadt</a>,
1457: <a href="mailto:niklas@openbsd.org">Niklas Hallqvist</a>,
1458: <a href="mailto:art@openbsd.org">Artur Grabowski</a>,
1459: <a href="mailto:angelos@openbsd.org">Angelos D. Keromytis</a>,
1460: <a href="mailto:provos@openbsd.org">Niels Provos</a>.<br>
1461: <a href="papers/crypt-paper.ps">paper</a> and
1462: <a href="papers/crypt-slides.ps">slides</a>.
1.113 deraadt 1463: <p>
1464: <li>strlcpy and strlcat -- consistent, safe, string copy and concatenation.<br>
1.294 david 1465: <a href="events.html#usenix99">Usenix 1999</a>,
1466: by <a href="mailto:millert@openbsd.org">Todd C. Miller</a>,
1467: <a href="mailto:deraadt@openbsd.org">Theo de Raadt</a>.<br>
1468: <a href="papers/strlcpy-paper.ps">paper</a> and
1469: <a href="papers/strlcpy-slides.ps">slides</a>.
1.113 deraadt 1470: <p>
1.118 deraadt 1471: <li>Dealing with Public Ethernet Jacks-Switches, Gateways, and Authentication.<br>
1.294 david 1472: <a href="events.html#lisa99">LISA 1999</a>,
1473: by <a href="mailto:beck@openbsd.org">Bob Beck</a>.<br>
1474: <a href="papers/authgw-paper.ps">paper</a> and
1475: <a href="papers/authgw-slides.ps">slides</a>.
1.118 deraadt 1476: <p>
1.153 jufi 1477: <li>Encrypting Virtual Memory<br>
1.294 david 1478: <a href="events.html#sec2000">Usenix Security 2000</a>,
1479: <a href="mailto:provos@openbsd.org">Niels Provos</a>.<br>
1480: <a href="papers/swapencrypt.ps">paper</a> and
1481: <a href="papers/swapencrypt-slides.ps">slides</a>.
1.142 deraadt 1482: <p>
1.107 deraadt 1483: </ul>
1.294 david 1484: </ul>
1.106 deraadt 1485:
1.2 deraadt 1486: <hr>
1.294 david 1487: <a href="index.html"><img height=24 width=24 src="back.gif" border=0 alt="OpenBSD"></a>
1488: <a href="mailto:www@openbsd.org">www@openbsd.org</a>
1.24 deraadt 1489: <br>
1.329 ! brad 1490: <small>$OpenBSD: security.html,v 1.328 2006/09/08 20:35:11 brad Exp $</small>
1.1 deraadt 1491:
1.24 deraadt 1492: </body>
1493: </html>
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