Annotation of www/security.html, Revision 1.325
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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>
1.325 ! brad 235: <li><a href="errata.html#httpd">Jul 30, 2006:
! 236: httpd(8)'s mod_rewrite has a potentially exploitable off-by-one buffer
! 237: overflow.</a>
1.324 brad 238: <li><a href="errata.html#sendmail2">Jun 15, 2006:
239: A potential denial of service problem has been found in sendmail.</a>
1.322 brad 240: <li><a href="errata.html#xorg">May 2, 2006:
241: A buffer overflow exists in the Render extension of the X server.</a>
1.321 brad 242: <li><a href="errata.html#sendmail">Mar 25, 2006:
243: A race condition has been reported to exist in the handling by sendmail
244: of asynchronous signals.</a>
245: </ul>
246:
247: <li>
1.318 deraadt 248: <a name="38"></a>
249:
250: <h3><font color="#e00000">OpenBSD 3.8 Security Advisories</font></h3>
251: These are the OpenBSD 3.8 advisories -- all these problems are solved
252: in <a href=anoncvs.html>OpenBSD current</a> and the
253: <a href=stable.html>patch branch</a>.
254:
255: <p>
256: <ul>
1.325 ! brad 257: <li><a href="errata38.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="errata38.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="errata38.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="errata38.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: <li><a href="errata38.html#ssh">Feb 12, 2006:
1.320 brad 268: Josh Bressers has reported a weakness in OpenSSH caused due to the
269: insecure use of the system(3) function in scp(1) when performing copy
270: operations using filenames that are supplied by the user from the
271: command line.</a>
1.321 brad 272: <li><a href="errata38.html#fd">Jan 5, 2006:
1.319 brad 273: Do not allow users to trick suid programs into re-opening files via
274: /dev/fd.</a>
1.321 brad 275: <li><a href="errata38.html#perl">Jan 5, 2006:
1.319 brad 276: A buffer overflow has been found in the Perl interpreter with the
277: sprintf function which may be exploitable under certain conditions.</a>
1.318 deraadt 278: </ul>
279:
1.323 steven 280: <p>
281: OpenBSD 3.7 and earlier releases are not supported anymore. The following
282: paragraphs only list advisories issued while they were maintained; these
283: releases are likely to be affected by the advisories for more recent releases.
284: <br>
285:
1.318 deraadt 286: <li>
1.312 david 287: <a name="37"></a>
288:
289: <h3><font color="#e00000">OpenBSD 3.7 Security Advisories</font></h3>
290: These are the OpenBSD 3.7 advisories -- all these problems are solved
1.323 steven 291: in <a href="anoncvs.html">OpenBSD current</a>. The
292: <a href="stable.html">patch branch</a> for 3.7 is no longer being maintained,
293: you should update your machine.
1.312 david 294:
295: <p>
296: <ul>
1.322 brad 297: <li><a href="errata37.html#xorg">May 2, 2006:
298: A buffer overflow exists in the Render extension of the X server.</a>
1.321 brad 299: <li><a href="errata37.html#sendmail">Mar 25, 2006:
300: A race condition has been reported to exist in the handling by sendmail
301: of asynchronous signals.</a>
1.320 brad 302: <li><a href="errata37.html#ssh">Feb 12, 2006:
303: Josh Bressers has reported a weakness in OpenSSH caused due to the
304: insecure use of the system(3) function in scp(1) when performing copy
305: operations using filenames that are supplied by the user from the
306: command line.</a>
1.319 brad 307: <li><a href="errata37.html#fd">Jan 5, 2006:
308: Do not allow users to trick suid programs into re-opening files via
309: /dev/fd.</a>
310: <li><a href="errata37.html#perl">Jan 5, 2006:
311: A buffer overflow has been found in the Perl interpreter with the
312: sprintf function which may be exploitable under certain conditions.</a>
1.318 deraadt 313: <li><a href="errata37.html#libz2">Jul 21, 2005:
1.317 millert 314: Fix another buffer overflow in the zlib library that may be exploitable.</a>
1.318 deraadt 315: <li><a href="errata37.html#libz">Jul 6, 2005:
1.316 millert 316: Fix a buffer overflow in the zlib library that may be exploitable.</a>
1.318 deraadt 317: <li><a href="errata37.html#sudo">Jun 20, 2005:
1.316 millert 318: Fix a race condition in sudo(8) that could allow a user
1.315 millert 319: to run arbitrary commands.</a>
1.318 deraadt 320: <li><a href="errata37.html#cvs">Jun 7, 2005:
1.313 brad 321: Fix a buffer overflow, memory leaks, and NULL pointer
322: dereference in cvs(1).</a>
1.312 david 323: </ul>
324:
325: <li>
1.301 miod 326: <a name="36"></a>
327:
328: <h3><font color="#e00000">OpenBSD 3.6 Security Advisories</font></h3>
329: These are the OpenBSD 3.6 advisories -- all these problems are solved
1.323 steven 330: in <a href="anoncvs.html">OpenBSD current</a>. The
331: <a href="stable.html">patch branch</a> for 3.6 is no longer being maintained,
332: you should update your machine.
1.301 miod 333:
334: <p>
1.302 markus 335: <ul>
1.317 millert 336: <li><a href="errata36.html#libz2">Jul 21, 2005:
337: Fix another buffer overflow in the zlib library that may be exploitable.</a>
1.316 millert 338: <li><a href="errata36.html#libz">Jul 6, 2005:
339: Fix a buffer overflow in the zlib library that may be exploitable.</a>
1.315 millert 340: <li><a href="errata36.html#sudo">Jun 20, 2005:
1.316 millert 341: Fix a race condition in sudo(8) that could allow a user
1.315 millert 342: to run arbitrary commands.</a>
1.311 deraadt 343: <li><a href="errata36.html#cvs">Apr 28, 2005:
1.310 brad 344: Fix a buffer overflow, memory leaks, and NULL pointer
345: dereference in cvs(1).</a>
1.311 deraadt 346: <li><a href="errata36.html#telnet">Mar 30, 2005:
1.309 brad 347: Due to buffer overflows in telnet(1), a malicious
348: server or man-in-the-middle attack could allow
349: execution of arbitrary code with the privileges of
350: the user invoking telnet(1).</a>
1.311 deraadt 351: <li><a href="errata36.html#copy">Mar 16, 2005:
1.307 brad 352: More stringent checking should be done in the copy(9)
353: functions to prevent their misuse.</a>
1.311 deraadt 354: <li><a href="errata36.html#locore">Feb 28, 2005:
1.306 brad 355: More stringent checking should be done in the copy(9)
356: functions to prevent their misuse.</a>
1.311 deraadt 357: <li><a href="errata36.html#httpd">Jan 12, 2005:
1.304 brad 358: httpd(8)'s mod_include module fails to properly validate
359: the length of user supplied tag strings prior to copying
1.305 brad 360: them to a local buffer, causing a buffer overflow.</a>
1.311 deraadt 361: <li><a href="errata36.html#pfkey">Dec 14, 2004:
1.302 markus 362: On systems running isakmpd(8) it is possible for a local
363: user to cause kernel memory corruption and system panic by
1.303 markus 364: setting ipsec(4) credentials on a socket.</a>
1.302 markus 365: </ul>
1.301 miod 366:
367: <li>
1.288 matthieu 368: <a name="35"></a>
1.279 deraadt 369:
1.294 david 370: <h3><font color="#e00000">OpenBSD 3.5 Security Advisories</font></h3>
1.279 deraadt 371: These are the OpenBSD 3.5 advisories -- all these problems are solved
1.314 miod 372: in <a href="anoncvs.html">OpenBSD current</a>. The
373: <a href="stable.html">patch branch</a> for 3.5 is no longer being maintained,
374: you should update your machine.
1.279 deraadt 375:
376: <p>
377: <ul>
1.310 brad 378: <li><a href="errata35.html#cvs4">Apr 28, 2005:
379: Fix a buffer overflow, memory leaks, and NULL pointer
380: dereference in cvs(1).</a>
1.309 brad 381: <li><a href="errata35.html#telnet">Mar 30, 2005:
382: Due to buffer overflows in telnet(1), a malicious
383: server or man-in-the-middle attack could allow
384: execution of arbitrary code with the privileges of
385: the user invoking telnet(1).</a>
1.308 brad 386: <li><a href="errata35.html#copy">Mar 16, 2005:
1.307 brad 387: More stringent checking should be done in the copy(9)
388: functions to prevent their misuse.</a>
1.306 brad 389: <li><a href="errata35.html#locore">Feb 28, 2005:
390: More stringent checking should be done in the copy(9)
391: functions to prevent their misuse.</a>
1.304 brad 392: <li><a href="errata35.html#httpd3">Jan 12, 2005:
393: httpd(8)'s mod_include module fails to properly validate
394: the length of user supplied tag strings prior to copying
1.305 brad 395: them to a local buffer, causing a buffer overflow.</a>
1.302 markus 396: <li><a href="errata35.html#pfkey">Dec 14, 2004:
397: On systems running isakmpd(8) it is possible for a local
398: user to cause kernel memory corruption and system panic by
1.303 markus 399: setting ipsec(4) credentials on a socket.</a>
1.301 miod 400: <li><a href="errata35.html#radius">Sep 20, 2004:
1.299 millert 401: Radius-based authentication is vulnerable to spoofed replies.</a>
1.301 miod 402: <li><a href="errata35.html#xpm">Sep 16, 2004:
1.298 brad 403: The Xpm library has vulnerabilities when parsing malicious images.</a>
1.301 miod 404: <li><a href="errata35.html#httpd2"> Sep 10, 2004:
1.297 brad 405: httpd(8)'s mod_rewrite module can be made to write one zero byte in
406: an arbitrary memory position outside of a char array, causing a DoS
407: or possibly buffer overflows.</a>
1.301 miod 408: <li><a href="errata35.html#httpd"> Jun 12, 2004:
1.300 deraadt 409: Multiple vulnerabilities have been found in httpd(8) / mod_ssl.</a>
1.301 miod 410: <li><a href="errata35.html#isakmpd"> Jun 10, 2004:
1.291 hshoexer 411: isakmpd(8) still has issues with unauthorized SA deletion,
1.293 brad 412: an attacker can delete IPsec tunnels at will.</a>
1.301 miod 413: <li><a href="errata35.html#cvs3"> Jun 9, 2004:
1.290 millert 414: Multiple remote vulnerabilities have been found in the cvs(1)
415: server which can be used by CVS clients to crash or execute
1.293 brad 416: arbitrary code on the server.</a>
1.301 miod 417: <li><a href="errata35.html#kerberos"> May 30, 2004:
1.289 beck 418: kdc(8) performs inadequate checking of request fields, leading
419: to the possibility of principal impersonation from other
420: Kerberos realms if they are trusted with a cross-realm trust.</a>
1.301 miod 421: <li><a href="errata35.html#xdm"> May 26, 2004:
1.287 matthieu 422: xdm(1) ignores the requestPort resource and creates a
1.293 brad 423: listening socket regardless of the setting in xdm-config.</a>
1.301 miod 424: <li><a href="errata35.html#cvs2"> May 20, 2004:
1.286 otto 425: A buffer overflow in the cvs(1) server has been found,
426: which can be used by CVS clients to execute arbitrary code on
1.293 brad 427: the server.</a>
1.301 miod 428: <li><a href="errata35.html#procfs"> May 13, 2004:
1.282 tedu 429: Integer overflow problems were found in procfs, allowing
1.293 brad 430: reading of arbitrary kernel memory.</a>
1.301 miod 431: <li><a href="errata35.html#cvs"> May 5, 2004:
1.281 otto 432: Pathname validation problems have been found in cvs(1),
433: allowing clients and servers access to files outside the
1.293 brad 434: repository or local CVS tree.</a>
1.279 deraadt 435: </ul>
436:
437: <p>
438: <li>
1.288 matthieu 439: <a name="34"></a>
1.261 david 440:
1.294 david 441: <h3><font color="#e00000">OpenBSD 3.4 Security Advisories</font></h3>
1.261 david 442: These are the OpenBSD 3.4 advisories -- all these problems are solved
1.301 miod 443: in <a href="anoncvs.html">OpenBSD current</a>. The
444: <a href="stable.html">patch branch</a> for 3.4 is no longer being maintained,
445: you should update your machine.
1.261 david 446: <p>
447: <ul>
1.302 markus 448: <li><a href="errata34.html#pfkey">Dec 14, 2004:
449: On systems running isakmpd(8) it is possible for a local
450: user to cause kernel memory corruption and system panic by
1.303 markus 451: setting ipsec(4) credentials on a socket.</a>
1.298 brad 452: <li><a href="errata34.html#xpm">Sep 16, 2004:
453: The Xpm library has vulnerabilities when parsing malicious images.</a>
1.297 brad 454: <li><a href="errata34.html#httpd4"> Sep 10, 2004:
455: httpd(8)'s mod_rewrite module can be made to write one zero byte in
456: an arbitrary memory position outside of a char array, causing a DoS
457: or possibly buffer overflows.</a>
1.294 david 458: <li><a href="errata34.html#httpd3"> Jun 12, 2004:
1.300 deraadt 459: Multiple vulnerabilities have been found in httpd(8) / mod_ssl.</a>
1.294 david 460: <li><a href="errata34.html#isakmpd3"> Jun 10, 2004:
1.292 brad 461: isakmpd(8) still has issues with unauthorized SA deletion,
1.293 brad 462: an attacker can delete IPsec tunnels at will.</a>
1.294 david 463: <li><a href="errata34.html#cvs3"> Jun 9, 2004:
1.290 millert 464: Multiple remote vulnerabilities have been found in the cvs(1)
465: server which can be used by CVS clients to crash or execute
1.293 brad 466: arbitrary code on the server.</a>
1.294 david 467: <li><a href="errata34.html#kerberos"> May 30, 2004:
1.289 beck 468: kdc(8) performs inadequate checking of request fields, leading
469: to the possibility of principal impersonation from other
470: Kerberos realms if they are trusted with a cross-realm trust.</a>
1.294 david 471: <li><a href="errata34.html#cvs2"> May 20, 2004:
1.286 otto 472: A buffer overflow in the cvs(1) server has been found,
473: which can be used by CVS clients to execute arbitrary code on
474: the server.</a>
1.294 david 475: <li><a href="errata34.html#procfs"> May 13, 2004:
1.282 tedu 476: Integer overflow problems were found in procfs, allowing
477: reading of arbitrary kernel memory.</a>
1.294 david 478: <li><a href="errata34.html#cvs"> May 5, 2004:
1.281 otto 479: Pathname validation problems have been found in cvs(1),
480: allowing clients and servers access to files outside the
481: repository or local CVS tree.</a>
1.294 david 482: <li><a href="errata34.html#openssl"> March 17, 2004:
1.277 millert 483: A missing check for a NULL-pointer dereference may allow a
1.281 otto 484: remote attacker to crash applications using OpenSSL.</a>
1.294 david 485: <li><a href="errata34.html#isakmpd2"> March 17, 2004:
1.276 brad 486: Defects in the payload validation and processing functions of
487: isakmpd have been discovered. An attacker could send malformed
488: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.294 david 489: <li><a href="errata34.html#httpd2"> March 13, 2004:
1.275 brad 490: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
491: access module, using IP addresses without a netmask on big endian
492: 64-bit platforms causes the rules to fail to match.</a>
1.294 david 493: <li><a href="errata34.html#ip6"> February 8, 2004:
1.272 dhartmei 494: An IPv6 MTU handling problem exists that could be used by an
495: attacker to cause a denial of service attack.</a>
1.294 david 496: <li><a href="errata34.html#sysvshm"> February 5, 2004:
1.271 millert 497: A reference counting bug in shmat(2) could be used to write to
498: kernel memory under certain circumstances.</a>
1.294 david 499: <li><a href="errata34.html#isakmpd">January 13, 2004:
1.266 brad 500: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 501: by Thomas Walpuski.</a>
1.294 david 502: <li><a href="errata34.html#ibcs2">November 17, 2003:
1.264 henning 503: It may be possible for a local user to overrun the stack in
504: compat_ibcs2(8) and cause a kernel panic.</a>
1.294 david 505: <li><a href="errata34.html#asn1">November 1, 2003:
1.262 margarid 506: The use of certain ASN.1 encodings or malformed public keys may
507: allow an attacker to mount a denial of service attack against
508: applications linked with ssl(3).</a>
1.261 david 509: </ul>
510:
511: <li>
1.288 matthieu 512: <a name="33"></a>
1.246 deraadt 513:
1.294 david 514: <h3><font color="#e00000">OpenBSD 3.3 Security Advisories</font></h3>
1.246 deraadt 515: These are the OpenBSD 3.3 advisories -- all these problems are solved
1.294 david 516: in <a href="anoncvs.html">OpenBSD current</a>. The
517: <a href="stable.html">patch branch</a> for 3.3 is no longer being maintained,
1.284 otto 518: you should update your machine.
1.246 deraadt 519: <p>
520: <ul>
1.294 david 521: <li><a href="errata33.html#cvs"> May 5, 2004:
1.281 otto 522: Pathname validation problems have been found in cvs(1),
523: allowing clients and servers access to files outside the
524: repository or local CVS tree.</a>
1.294 david 525: <li><a href="errata33.html#openssl"> March 17, 2004:
1.277 millert 526: A missing check for a NULL-pointer dereference may allow a
1.281 otto 527: remote attacker to crash applications using OpenSSL.</a>
1.294 david 528: <li><a href="errata33.html#isakmpd2"> March 17, 2004:
1.276 brad 529: Defects in the payload validation and processing functions of
530: isakmpd have been discovered. An attacker could send malformed
531: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.294 david 532: <li><a href="errata33.html#httpd2"> March 13, 2004:
1.275 brad 533: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
534: access module, using IP addresses without a netmask on big endian
535: 64-bit platforms causes the rules to fail to match.</a>
1.294 david 536: <li><a href="errata33.html#ip6"> February 8, 2004:
1.275 brad 537: An IPv6 MTU handling problem exists that could be used by an
538: attacker to cause a denial of service attack.</a>
1.294 david 539: <li><a href="errata33.html#sysvshm"> February 5, 2004:
1.271 millert 540: A reference counting bug in shmat(2) could be used to write to
541: kernel memory under certain circumstances.</a>
1.294 david 542: <li><a href="errata33.html#isakmpd">January 15, 2004:
1.268 brad 543: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 544: by Thomas Walpuski.</a>
1.294 david 545: <li><a href="errata33.html#ibcs2">November 17, 2003:
1.264 henning 546: It may be possible for a local user to execute arbitrary code
547: resulting in escalation of privileges due to a stack overrun
548: in compat_ibcs2(8).</a>
1.294 david 549: <li><a href="errata33.html#asn1">October 1, 2003:
1.257 millert 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>
1.294 david 553: <li><a href="errata33.html#pfnorm">September 24, 2003:
1.258 beck 554: Access of freed memory in pf(4) could be used to
1.260 margarid 555: remotely panic a machine using scrub rules.</a>
1.294 david 556: <li><a href="errata33.html#sendmail">September 17, 2003:
1.256 millert 557: A buffer overflow in the address parsing in
558: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 559: <li><a href="errata33.html#sshbuffer">September 16, 2003:
1.255 millert 560: OpenSSH versions prior to 3.7 contains a buffer management error
561: that is potentially exploitable.</a>
1.294 david 562: <li><a href="errata33.html#sysvsem">September 10, 2003:
1.254 millert 563: Root may be able to reduce the security level by taking advantage of
564: an integer overflow when the semaphore limits are made very large.</a>
1.294 david 565: <li><a href="errata33.html#semget">August 20, 2003:
1.252 millert 566: An improper bounds check in the kernel may allow a local user
567: to panic the kernel.</a>
1.294 david 568: <li><a href="errata33.html#realpath">August 4, 2003:
1.249 millert 569: An off-by-one error exists in the C library function realpath(3)
570: may allow an attacker to gain escalated privileges.</a>
1.246 deraadt 571: </ul>
572:
1.265 miod 573:
1.247 david 574: <p>
1.246 deraadt 575: <li>
1.288 matthieu 576: <a name="32"></a>
1.224 deraadt 577:
1.294 david 578: <h3><font color="#e00000">OpenBSD 3.2 Security Advisories</font></h3>
1.224 deraadt 579: These are the OpenBSD 3.2 advisories -- all these problems are solved
1.294 david 580: in <a href="anoncvs.html">OpenBSD current</a>. The
581: <a href="stable.html">patch branch</a> for 3.2 is no longer being maintained,
1.265 miod 582: you should update your machine.
1.224 deraadt 583: <p>
584: <ul>
1.294 david 585: <li><a href="errata32.html#asn1">October 1, 2003:
1.257 millert 586: The use of certain ASN.1 encodings or malformed public keys may
587: allow an attacker to mount a denial of service attack against
588: applications linked with ssl(3). This does not affect OpenSSH.</a>
1.294 david 589: <li><a href="errata32.html#pfnorm">September 24, 2003:
1.258 beck 590: Access of freed memory in pf(4) could be used to
1.260 margarid 591: remotely panic a machine using scrub rules.</a>
1.294 david 592: <li><a href="errata32.html#sendmail4">September 17, 2003:
1.256 millert 593: A buffer overflow in the address parsing in
594: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 595: <li><a href="errata32.html#sshbuffer">September 16, 2003:
1.255 millert 596: OpenSSH versions prior to 3.7 contains a buffer management error
597: that is potentially exploitable.</a>
1.294 david 598: <li><a href="errata32.html#sendmail3">August 25, 2003:
1.253 brad 599: Fix for a potential security issue in
600: sendmail(8) with respect to DNS maps.</a>
1.294 david 601: <li><a href="errata32.html#realpath">August 4, 2003:
1.249 millert 602: An off-by-one error exists in the C library function realpath(3)
603: may allow an attacker to gain escalated privileges.</a>
1.294 david 604: <li><a href="errata32.html#sendmail2">March 31, 2003:
1.244 miod 605: A buffer overflow in the address parsing in
606: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 607: <li><a href="errata32.html#kerberos">March 24, 2003:
1.242 millert 608: A cryptographic weaknesses in the Kerberos v4 protocol can be
609: exploited on Kerberos v5 as well.</a>
1.294 david 610: <li><a href="errata32.html#kpr">March 19, 2003:
1.241 jufi 611: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 612: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.294 david 613: <li><a href="errata32.html#blinding">March 18, 2003:
1.239 miod 614: Various SSL and TLS operations in OpenSSL are vulnerable to
615: timing attacks.</a>
1.294 david 616: <li><a href="errata32.html#lprm">March 5, 2003:
1.238 millert 617: A buffer overflow in lprm(1) may allow an attacker to elevate
618: privileges to user daemon.</a>.
1.294 david 619: <li><a href="errata32.html#sendmail">March 3, 2003:
1.237 miod 620: A buffer overflow in the envelope comments processing in
621: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 622: <li><a href="errata32.html#httpd">February 25, 2003:
1.236 margarid 623: httpd(8) leaks file inode numbers via ETag header as well as
624: child PIDs in multipart MIME boundary generation. This could
625: lead, for example, to NFS exploitation because it uses inode
626: numbers as part of the file handle.</a>
1.294 david 627: <li><a href="errata32.html#ssl">February 22, 2003:
1.234 margarid 628: In ssl(8) an information leak can occur via timing by performing
629: a MAC computation even if incorrect block cipher padding has
630: been found, this is a countermeasure. Also, check for negative
631: sizes, in allocation routines.</a>
1.294 david 632: <li><a href="errata32.html#cvs">January 20, 2003:
1.232 millert 633: A double free exists in cvs(1) that could lead to privilege
634: escalation for cvs configurations where the cvs command is
1.233 margarid 635: run as a privileged user.</a>
1.294 david 636: <li><a href="errata32.html#named">November 14, 2002:
1.230 millert 637: A buffer overflow exists in named(8) that could lead to a
638: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 639: <li><a href="errata32.html#pool">November 6, 2002:
1.233 margarid 640: A logic error in the pool kernel memory allocator could cause
641: memory corruption in low-memory situations, causing the system
642: to crash.</a>
1.294 david 643: <li><a href="errata32.html#smrsh">November 6, 2002:
1.229 miod 644: An attacker can bypass smrsh(8)'s restrictions and execute
645: arbitrary commands with the privileges of his own account.</a>
1.294 david 646: <li><a href="errata32.html#pfbridge">November 6, 2002:
1.233 margarid 647: Network bridges running pf with scrubbing enabled could cause
648: mbuf corruption, causing the system to crash.</a>
1.294 david 649: <li><a href="errata32.html#kadmin">October 21, 2002:
1.228 miod 650: A buffer overflow can occur in the kadmind(8) daemon, leading
651: to possible remote crash or exploit.</a>
1.224 deraadt 652: </ul>
653:
1.227 miod 654: <p>
655: <li>
1.288 matthieu 656: <a name="31"></a>
1.203 deraadt 657:
1.294 david 658: <h3><font color="#e00000">OpenBSD 3.1 Security Advisories</font></h3>
1.203 deraadt 659: These are the OpenBSD 3.1 advisories -- all these problems are solved
1.294 david 660: in <a href="anoncvs.html">OpenBSD current</a>. The
661: <a href="stable.html">patch branch</a> for 3.1 is no longer being maintained,
1.258 beck 662: you should update your machine.
1.203 deraadt 663:
664: <p>
665: <ul>
1.294 david 666: <li><a href="errata31.html#sendmail2">March 31, 2003:
1.244 miod 667: A buffer overflow in the address parsing in
668: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 669: <li><a href="errata31.html#kerberos">March 24, 2003:
1.242 millert 670: A cryptographic weaknesses in the Kerberos v4 protocol can be
671: exploited on Kerberos v5 as well.</a>
1.294 david 672: <li><a href="errata31.html#kpr">March 19, 2003:
1.241 jufi 673: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 674: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.294 david 675: <li><a href="errata31.html#blinding">March 18, 2003:
1.239 miod 676: Various SSL and TLS operations in OpenSSL are vulnerable to
677: timing attacks.</a>
1.294 david 678: <li><a href="errata31.html#lprm">March 4, 2003:
1.238 millert 679: A buffer overflow in lprm(1) may allow an attacker to gain
680: root privileges.</a>
1.294 david 681: <li><a href="errata31.html#sendmail">March 3, 2003:
1.237 miod 682: A buffer overflow in the envelope comments processing in
683: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 684: <li><a href="errata31.html#ssl2">February 23, 2003:
1.235 miod 685: In ssl(8) an information leak can occur via timing by performing
686: a MAC computation even if incorrect block cipher padding has
687: been found, this is a countermeasure. Also, check for negative
688: sizes, in allocation routines.</a>
1.294 david 689: <li><a href="errata31.html#cvs">January 20, 2003:
1.232 millert 690: A double free exists in cvs(1) that could lead to privilege
691: escalation for cvs configurations where the cvs command is
1.294 david 692: run as a privileged user</a>.
693: <li><a href="errata31.html#named">November 14, 2002:
1.230 millert 694: A buffer overflow exists in named(8) that could lead to a
695: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 696: <li><a href="errata31.html#kernresource">November 6, 2002:
1.229 miod 697: Incorrect argument checking in the getitimer(2) system call
698: may allow an attacker to crash the system.</a>
1.294 david 699: <li><a href="errata31.html#smrsh">November 6, 2002:
1.229 miod 700: An attacker can bypass smrsh(8)'s restrictions and execute
701: arbitrary commands with the privileges of his own account.</a>
1.294 david 702: <li><a href="errata31.html#kadmin">October 21, 2002:
1.226 miod 703: A buffer overflow can occur in the kadmind(8) daemon, leading
704: to possible remote crash or exploit.</a>
1.294 david 705: <li><a href="errata31.html#kerntime">October 2, 2002:
1.222 jason 706: Incorrect argument checking in the setitimer(2) system call
707: may allow an attacker to write to kernel memory.</a>
1.294 david 708: <li><a href="errata31.html#scarg">August 11, 2002:
1.221 provos 709: An insufficient boundary check in the select system call
1.220 miod 710: allows an attacker to overwrite kernel memory and execute arbitrary code
711: in kernel context.</a>
1.294 david 712: <li><a href="errata31.html#ssl">July 30, 2002:
1.218 miod 713: Several remote buffer overflows can occur in the SSL2 server and SSL3
714: client of the ssl(8) library, as in the ASN.1 parser code in the
715: crypto(3) library, all of them being potentially remotely
716: exploitable.</a>
1.294 david 717: <li><a href="errata31.html#xdr">July 29, 2002:
1.218 miod 718: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
719: possible remote crash.</a>
1.294 david 720: <li><a href="errata31.html#pppd">July 29, 2002:
1.218 miod 721: A race condition exists in the pppd(8) daemon which may cause it to
722: alter the file permissions of an arbitrary file.</a>
1.294 david 723: <li><a href="errata31.html#isakmpd">July 5, 2002:
1.218 miod 724: Receiving IKE payloads out of sequence can cause isakmpd(8) to
725: crash.</a>
1.294 david 726: <li><a href="errata31.html#ktrace">June 27, 2002:
1.215 miod 727: The kernel would let any user ktrace set[ug]id processes.</a>
1.294 david 728: <li><a href="errata31.html#modssl">June 26, 2002:
1.213 miod 729: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 730: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.294 david 731: <li><a href="errata31.html#resolver">June 25, 2002:
1.212 millert 732: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 733: <li><a href="errata31.html#sshd">June 24, 2002:
1.216 deraadt 734: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 735: input validation error that can result in an integer overflow and
736: privilege escalation.</a>
1.294 david 737: <li><a href="errata31.html#httpd">June 19, 2002:
1.211 miod 738: A buffer overflow can occur during the interpretation of chunked
739: encoding in httpd(8), leading to possible remote crash.</a>
1.294 david 740: <li><a href="errata31.html#sshbsdauth">May 22, 2002:
1.209 markus 741: Under certain conditions, on systems using YP with netgroups
742: in the password database, it is possible that sshd(8) does
743: ACL checks for the requested user name but uses the password
744: database entry of a different user for authentication. This
745: means that denied users might authenticate successfully
746: while permitted users could be locked out.</a>
1.294 david 747: <li><a href="errata31.html#fdalloc2">May 8, 2002:
1.208 millert 748: A race condition exists that could defeat the kernel's
749: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 750: <li><a href="errata31.html#sudo">April 25, 2002:
1.205 millert 751: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 752: <li><a href="errata31.html#sshafs">April 22, 2002:
1.205 millert 753: A local user can gain super-user privileges due to a buffer
754: overflow in sshd(8) if AFS has been configured on the system
755: or if KerberosTgtPassing or AFSTokenPassing has been enabled
756: in the sshd_config file.</a>
1.203 deraadt 757: </ul>
758:
1.235 miod 759: <p>
1.203 deraadt 760: <li>
1.288 matthieu 761: <a name="30"></a>
1.187 deraadt 762:
1.294 david 763: <h3><font color="#e00000">OpenBSD 3.0 Security Advisories</font></h3>
1.187 deraadt 764: These are the OpenBSD 3.0 advisories -- all these problems are solved
1.294 david 765: in <a href="anoncvs.html">OpenBSD current</a>. The
766: <a href="stable.html">patch branch</a> for 3.0 is no longer being maintained,
1.258 beck 767: you should update your machine.
1.187 deraadt 768:
769: <p>
770: <ul>
1.294 david 771: <li><a href="errata30.html#named">November 14, 2002:
1.230 millert 772: A buffer overflow exists in named(8) that could lead to a
773: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 774: <li><a href="errata30.html#kernresource">November 6, 2002:
1.229 miod 775: Incorrect argument checking in the getitimer(2) system call
776: may allow an attacker to crash the system.</a>
1.294 david 777: <li><a href="errata30.html#smrsh">November 6, 2002:
1.229 miod 778: An attacker can bypass smrsh(8)'s restrictions and execute
779: arbitrary commands with the privileges of his own account.</a>
1.294 david 780: <li><a href="errata30.html#kadmin">October 21, 2002:
1.226 miod 781: A buffer overflow can occur in the kadmind(8) daemon, leading
782: to possible remote crash or exploit.</a>
1.294 david 783: <li><a href="errata30.html#kerntime">October 7, 2002:
1.223 miod 784: Incorrect argument checking in the setitimer(2) system call
785: may allow an attacker to write to kernel memory.</a>
1.294 david 786: <li><a href="errata30.html#scarg">August 11, 2002:
1.220 miod 787: An insufficient boundary check in the select and poll system calls
788: allows an attacker to overwrite kernel memory and execute arbitrary code
789: in kernel context.</a>
1.294 david 790: <li><a href="errata30.html#ssl">July 30, 2002:
1.218 miod 791: Several remote buffer overflows can occur in the SSL2 server and SSL3
792: client of the ssl(8) library, as in the ASN.1 parser code in the
793: crypto(3) library, all of them being potentially remotely
794: exploitable.</a>
1.294 david 795: <li><a href="errata30.html#xdr">July 29, 2002:
1.218 miod 796: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
797: possible remote crash.</a>
1.294 david 798: <li><a href="errata30.html#pppd">July 29, 2002:
1.218 miod 799: A race condition exists in the pppd(8) daemon which may cause it to
800: alter the file permissions of an arbitrary file.</a>
1.294 david 801: <li><a href="errata30.html#isakmpd2">July 5, 2002:
1.218 miod 802: Receiving IKE payloads out of sequence can cause isakmpd(8) to
803: crash.</a>
1.294 david 804: <li><a href="errata30.html#ktrace">June 27, 2002:
1.215 miod 805: The kernel would let any user ktrace set[ug]id processes.</a>
1.294 david 806: <li><a href="errata30.html#resolver">June 25, 2002:
1.212 millert 807: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 808: <li><a href="errata30.html#sshdauth">June 24, 2002:
1.216 deraadt 809: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 810: input validation error that can result in an integer overflow and
811: privilege escalation.</a>
1.294 david 812: <li><a href="errata30.html#modssl">June 24, 2002:
1.213 miod 813: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 814: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.294 david 815: <li><a href="errata30.html#httpd">June 19, 2002:
1.213 miod 816: A buffer overflow can occur during the interpretation of chunked
817: encoding in httpd(8), leading to possible remote crash.</a>
1.294 david 818: <li><a href="errata30.html#fdalloc2">May 8, 2002:
1.208 millert 819: A race condition exists that could defeat the kernel's
820: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 821: <li><a href="errata30.html#sudo2">April 25, 2002:
1.205 millert 822: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 823: <li><a href="errata30.html#sshafs">April 22, 2002:
1.205 millert 824: A local user can gain super-user privileges due to a buffer
825: overflow in sshd(8) if AFS has been configured on the system
826: or if KerberosTgtPassing or AFSTokenPassing has been enabled
827: in the sshd_config file.</a>
1.294 david 828: <li><a href="errata30.html#mail">April 11, 2002:
1.202 millert 829: The mail(1) was interpreting tilde escapes even when invoked
830: in non-interactive mode. As mail(1) is called as root from cron,
831: this can lead to a local root compromise.</a>
1.294 david 832: <li><a href="errata30.html#approval">March 19, 2002:
1.201 millert 833: Under certain conditions, on systems using YP with netgroups in
834: the password database, it is possible for the rexecd(8) and rshd(8)
835: daemons to execute a shell from a password database entry for a
836: different user. Similarly, atrun(8) may change to the wrong
837: home directory when running jobs.</a>
1.294 david 838: <li><a href="errata30.html#zlib">March 13, 2002:
1.200 millert 839: A potential double free() exists in the zlib library;
840: this is not exploitable on OpenBSD.
841: The kernel also contains a copy of zlib; it is not
842: currently known if the kernel zlib is exploitable.</a>
1.294 david 843: <li><a href="errata30.html#openssh">March 8, 2002:
1.198 millert 844: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 845: may allow a local user to gain super-user privileges.</a>
1.294 david 846: <li><a href="errata30.html#ptrace">January 21, 2002:
1.192 jason 847: A race condition between the ptrace(2) and execve(2) system calls
848: allows an attacker to modify the memory contents of suid/sgid
849: processes which could lead to compromise of the super-user account.</a>
1.294 david 850: <li><a href="errata30.html#sudo">January 17, 2002:
1.191 millert 851: There is a security hole in sudo(8) that can be exploited
852: when the Postfix sendmail replacement is installed that may
853: allow an attacker on the local host to gain root privileges.</a>
1.294 david 854: <li><a href="errata30.html#lpd">November 28, 2001:
1.189 millert 855: An attacker can trick a machine running the lpd daemon into
856: creating new files in the root directory from a machine with
857: remote line printer access.</a>
1.294 david 858: <li><a href="errata30.html#vi.recover">November 13, 2001:
1.188 millert 859: The vi.recover script can be abused in such a way as
860: to cause arbitrary zero-length files to be removed.</a>
1.294 david 861: <li><a href="errata30.html#pf">November 13, 2001:
1.190 mpech 862: pf(4) was incapable of dealing with certain ipv6 icmp packets,
863: resulting in a crash.</a>
1.294 david 864: <li><a href="errata30.html#sshd">November 12, 2001:
1.190 mpech 865: A security hole that may allow an attacker to partially authenticate
866: if -- and only if -- the administrator has enabled KerberosV.</a>
1.187 deraadt 867: </ul>
868:
869: <p>
870: <li>
1.288 matthieu 871: <a name="29"></a>
1.173 deraadt 872:
1.294 david 873: <h3><font color="#e00000">OpenBSD 2.9 Security Advisories</font></h3>
1.173 deraadt 874: These are the OpenBSD 2.9 advisories -- all these problems are solved
1.294 david 875: in <a href="anoncvs.html">OpenBSD current</a>. The
876: <a href="stable.html">patch branch</a>. for 2.9 is no longer being maintained,
1.258 beck 877: you should update your machine.
878:
1.173 deraadt 879:
880: <p>
881: <ul>
1.294 david 882: <li><a href="errata29.html#resolver">June 25, 2002:
1.212 millert 883: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 884: <li><a href="errata29.html#fdalloc2">May 8, 2002:
1.208 millert 885: A race condition exists that could defeat the kernel's
886: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 887: <li><a href="errata29.html#sudo2">April 25, 2002:
1.207 millert 888: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 889: <li><a href="errata29.html#sshafs">April 22, 2002:
1.206 millert 890: A local user can gain super-user privileges due to a buffer
891: overflow in sshd(8) if AFS has been configured on the system
892: or if KerberosTgtPassing or AFSTokenPassing has been enabled
893: in the sshd_config file.</a>
1.294 david 894: <li><a href="errata29.html#mail">April 11, 2002:
1.202 millert 895: The mail(1) was interpreting tilde escapes even when invoked
896: in non-interactive mode. As mail(1) is called as root from cron,
897: this can lead to a local root compromise.</a>
1.294 david 898: <li><a href="errata29.html#zlib">March 13, 2002:
1.200 millert 899: A potential double free() exists in the zlib library;
900: this is not exploitable on OpenBSD.
901: The kernel also contains a copy of zlib; it is not
902: currently known if the kernel zlib is exploitable.</a>
1.294 david 903: <li><a href="errata29.html#openssh">March 8, 2002:
1.198 millert 904: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 905: may allow a local user to gain super-user privileges.</a>
1.294 david 906: <li><a href="errata29.html#ptrace">January 21, 2002:
1.198 millert 907: A race condition between the ptrace(2) and execve(2) system calls
908: allows an attacker to modify the memory contents of suid/sgid
909: processes which could lead to compromise of the super-user account.</a>
1.294 david 910: <li><a href="errata29.html#sudo">January 17, 2002:
1.191 millert 911: There is a security hole in sudo(8) that can be exploited
912: when the Postfix sendmail replacement is installed that may
913: allow an attacker on the local host to gain root privileges.</a>
1.294 david 914: <li><a href="errata29.html#lpd2">November 28, 2001:
1.189 millert 915: An attacker can trick a machine running the lpd daemon into
916: creating new files in the root directory from a machine with
917: remote line printer access.</a>
1.294 david 918: <li><a href="errata29.html#vi.recover">November 13, 2001:
1.190 mpech 919: The vi.recover script can be abused in such a way as
920: to cause arbitrary zero-length files to be removed.</a>
1.294 david 921: <li><a href="errata29.html#uucp">September 11, 2001:
1.184 millert 922: A security hole exists in uuxqt(8) that may allow an
923: attacker to gain root privileges.</a>
1.294 david 924: <li><a href="errata29.html#lpd">August 29, 2001:
1.183 millert 925: A security hole exists in lpd(8) that may allow an
926: attacker to gain root privileges if lpd is running.</a>
1.294 david 927: <li><a href="errata29.html#sendmail2">August 21, 2001:
1.181 millert 928: A security hole exists in sendmail(8) that may allow an
929: attacker on the local host to gain root privileges.</a>
1.294 david 930: <li><a href="errata29.html#nfs">July 30, 2001:
1.180 jason 931: A kernel buffer overflow in the NFS code can be used to execute
932: arbitrary code by users with mount privileges (only root by
1.181 millert 933: default).</a>
1.294 david 934: <li><a href="errata29.html#kernexec">June 15, 2001:
1.178 aaron 935: A race condition in the kernel can lead to local root compromise.</a>
1.294 david 936: <li><a href="errata29.html#sshcookie">June 12, 2001:
1.177 markus 937: sshd(8) allows users to delete arbitrary files named "cookies"
938: if X11 forwarding is enabled. X11 forwarding is disabled
939: by default.</a>
1.294 david 940: <li><a href="errata29.html#fts">May 30, 2001:
1.176 millert 941: Programs using the fts routines can be tricked into changing
942: into the wrong directory.</a>
1.294 david 943: <li><a href="errata29.html#sendmail">May 29, 2001:
1.174 millert 944: Sendmail signal handlers contain unsafe code,
945: leading to numerous race conditions.</a>
1.173 deraadt 946: </ul>
947:
948: <p>
949: <li>
1.288 matthieu 950: <a name="28"></a>
1.152 deraadt 951:
1.294 david 952: <h3><font color="#e00000">OpenBSD 2.8 Security Advisories</font></h3>
1.152 deraadt 953: These are the OpenBSD 2.8 advisories -- all these problems are solved
1.294 david 954: in <a href="anoncvs.html">OpenBSD current</a>. The
955: <a href="stable.html">patch branch</a>. for 2.8 is no longer being maintained,
1.258 beck 956: you should update your machine.
957:
1.152 deraadt 958:
959: <p>
960: <ul>
1.294 david 961: <li><a href="errata28.html#uucp">September 11, 2001:
1.184 millert 962: A security hole exists in uuxqt(8) that may allow an
963: attacker to gain root privileges.</a>
1.294 david 964: <li><a href="errata28.html#lpd">August 29, 2001:
1.183 millert 965: A security hole exists in lpd(8) that may allow an
966: attacker to gain root privileges if lpd is running.</a>
1.294 david 967: <li><a href="errata28.html#sendmail2">August 21, 2001:
1.181 millert 968: A security hole exists in sendmail(8) that may allow an
969: attacker on the local host to gain root privileges.</a>
1.294 david 970: <li><a href="errata28.html#kernexec">June 15, 2001:
1.178 aaron 971: A race condition in the kernel can lead to local root compromise.</a>
1.294 david 972: <li><a href="errata28.html#fts">May 30, 2001:
1.176 millert 973: Programs using the fts routines can be tricked into changing
974: into the wrong directory.</a>
1.294 david 975: <li><a href="errata28.html#sendmail">May 29, 2001:
1.175 millert 976: Sendmail signal handlers contain unsafe code,
977: leading to numerous race conditions.</a>
1.294 david 978: <li><a href="errata28.html#ipf_frag">Apr 23, 2001:
1.231 mickey 979: IPF contains a serious bug with its handling of fragment caching.</a>
1.294 david 980: <li><a href="errata28.html#glob_limit">Apr 23, 2001:
1.172 ericj 981: ftpd(8) contains a potential DoS relating to glob(3).</a>
1.294 david 982: <li><a href="errata28.html#glob">Apr 10, 2001:
1.170 ericj 983: The glob(3) library call contains multiple buffer overflows.</a>
1.294 david 984: <li><a href="errata28.html#readline">Mar 18, 2001:
1.169 millert 985: The readline library creates history files with permissive modes based on the user's umask.</a>
1.294 david 986: <li><a href="errata28.html#ipsec_ah">Mar 2, 2001:
1.167 ericj 987: Insufficient checks in the IPSEC AH IPv4 option handling code can lead to a buffer overrun in the kernel.</a>
1.294 david 988: <li><a href="errata28.html#userldt">Mar 2, 2001:
1.168 horacio 989: The <b>USER_LDT</b> kernel option allows an attacker to gain access to privileged areas of kernel memory.</a>
1.294 david 990: <li><a href="errata28.html#sudo">Feb 22, 2001:
1.171 millert 991: a non-exploitable buffer overflow was fixed in sudo(8).</a>
1.294 david 992: <li><a href="errata28.html#named">Jan 29, 2001:
1.163 jason 993: merge named(8) with ISC BIND 4.9.8-REL, which fixes some buffer vulnerabilities.</a>
1.294 david 994: <li><a href="errata28.html#rnd">Jan 22, 2001:
1.162 jason 995: rnd(4) did not use all of its input when written to.</a>
1.294 david 996: <li><a href="errata28.html#xlock">Dec 22, 2000:
1.159 ericj 997: xlock(1)'s authentication was re-done to authenticate via a named pipe. (patch and new xlock binaries included).</a>
1.294 david 998: <li><a href="errata28.html#procfs">Dec 18, 2000:
1.157 ericj 999: Procfs contains numerous overflows. Procfs is not used by default in OpenBSD. (patch included).</a>
1.294 david 1000: <li><a href="errata28.html#kerberos2">Dec 10, 2000:
1.156 deraadt 1001: Another problem exists in KerberosIV libraries (patch included).</a>
1.294 david 1002: <li><a href="errata28.html#kerberos">Dec 7, 2000:
1.155 deraadt 1003: A set of problems in KerberosIV exist (patch included).</a>
1.294 david 1004: <li><a href="errata28.html#ftpd">Dec 4, 2000:
1.154 millert 1005: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.152 deraadt 1006: </ul>
1007:
1008: <p>
1009: <li>
1.288 matthieu 1010: <a name="27"></a>
1.124 deraadt 1011:
1.294 david 1012: <h3><font color="#e00000">OpenBSD 2.7 Security Advisories</font></h3>
1.124 deraadt 1013: These are the OpenBSD 2.7 advisories -- all these problems are solved
1.294 david 1014: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.124 deraadt 1015: OpenBSD 2.6 advisories listed below are fixed in OpenBSD 2.7.
1016:
1017: <p>
1018: <ul>
1.294 david 1019: <li><a href="errata27.html#readline">Mar 18, 2001:
1.169 millert 1020: The readline library creates history files with permissive modes based on the user's umask.</a>
1.294 david 1021: <li><a href="errata27.html#sudo">Feb 22, 2001:
1.169 millert 1022: a buffer overflow was fixed in sudo(8).</a>
1.294 david 1023: <li><a href="errata27.html#ftpd">Dec 4, 2000:
1.154 millert 1024: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.294 david 1025: <li><a href="errata27.html#sshforwarding">Nov 10, 2000:
1.152 deraadt 1026: Hostile servers can force OpenSSH clients to do agent or X11 forwarding.
1027: (patch included)</a>
1.294 david 1028: <li><a href="errata27.html#xtrans">Oct 26, 2000:
1.151 matthieu 1029: X11 libraries have 2 potential overflows in xtrans code.
1030: (patch included)</a>
1.294 david 1031: <li><a href="errata27.html#httpd">Oct 18, 2000:
1.150 beck 1032: Apache mod_rewrite and mod_vhost_alias modules could expose files
1033: on the server in certain configurations if used.
1034: (patch included)</a>
1.294 david 1035: <li><a href="errata27.html#telnetd">Oct 10, 2000:
1.149 millert 1036: The telnet daemon does not strip out the TERMINFO, TERMINFO_DIRS,
1037: TERMPATH and TERMCAP environment variables as it should.
1038: (patch included)</a>
1.294 david 1039: <li><a href="errata27.html#format_strings">Oct 6, 2000:
1.148 millert 1040: There are printf-style format string bugs in several privileged
1041: programs. (patch included)</a>
1.294 david 1042: <li><a href="errata27.html#curses">Oct 6, 2000:
1.147 millert 1043: libcurses honored terminal descriptions in the $HOME/.terminfo
1044: directory as well as in the TERMCAP environment variable for
1045: setuid and setgid applications.
1.146 deraadt 1046: (patch included)</a>
1.294 david 1047: <li><a href="errata27.html#talkd">Oct 6, 2000:
1.146 deraadt 1048: A format string vulnerability exists in talkd(8).
1049: (patch included)</a>
1.294 david 1050: <li><a href="errata27.html#pw_error">Oct 3, 2000:
1.145 aaron 1051: A format string vulnerability exists in the pw_error() function of the
1052: libutil library, yielding localhost root through chpass(1).
1053: (patch included)</a>
1.294 david 1054: <li><a href="errata27.html#ipsec">Sep 18, 2000:
1.144 jason 1055: Bad ESP/AH packets could cause a crash under certain conditions.
1056: (patch included)</a>
1.294 david 1057: <li><a href="errata27.html#xlock">Aug 16, 2000:
1.141 deraadt 1058: A format string vulnerability (localhost root) exists in xlock(1).
1059: (patch included)</a>
1.294 david 1060: <li><a href="errata27.html#X11_libs">July 14, 2000:
1.139 deraadt 1061: Various bugs found in X11 libraries have various side effects, almost
1062: completely denial of service in OpenBSD.
1063: (patch included)</a>
1.294 david 1064: <li><a href="errata27.html#ftpd">July 5, 2000:
1.136 deraadt 1065: Just like pretty much all the other unix ftp daemons
1066: on the planet, ftpd had a remote root hole in it.
1067: Luckily, ftpd was not enabled by default.
1.137 deraadt 1068: The problem exists if anonymous ftp is enabled.
1.136 deraadt 1069: (patch included)</a>
1.294 david 1070: <li><a href="errata27.html#mopd">July 5, 2000:
1.136 deraadt 1071: Mopd, very rarely used, contained some buffer overflows.
1072: (patch included)</a>
1.294 david 1073: <li><a href="errata27.html#libedit">June 28, 2000:
1.135 deraadt 1074: libedit would check for a <b>.editrc</b> file in the current
1075: directory. Not known to be a real security issue, but a patch
1076: is available anyways.
1077: (patch included)</a>
1.294 david 1078: <li><a href="errata27.html#dhclient">June 24, 2000:
1.134 deraadt 1079: A serious bug in dhclient(8) could allow strings from a
1080: malicious dhcp server to be executed in the shell as root.
1081: (patch included)</a>
1.294 david 1082: <li><a href="errata27.html#isakmpd">June 9, 2000:
1.133 deraadt 1083: A serious bug in isakmpd(8) policy handling wherein
1084: policy verification could be completely bypassed in isakmpd.
1085: (patch included)</a>
1.294 david 1086: <li><a href="errata27.html#uselogin">June 6, 2000:
1.132 deraadt 1087: The non-default flag UseLogin in <b>/etc/sshd_config</b> is broken,
1088: should not be used, and results in security problems on
1089: other operating systems.</a>
1.294 david 1090: <li><a href="errata27.html#bridge">May 26, 2000:
1.129 deraadt 1091: The bridge(4) <i>learning</i> flag may be bypassed.
1.128 deraadt 1092: (patch included)</a>
1.294 david 1093: <li><a href="errata27.html#ipf">May 25, 2000:
1.127 kjell 1094: Improper use of ipf <i>keep-state</i> rules can result
1095: in firewall rules being bypassed. (patch included)</a>
1096:
1.124 deraadt 1097: </ul>
1098:
1099: <p>
1100: <li>
1.288 matthieu 1101: <a name="26"></a>
1.119 deraadt 1102:
1.294 david 1103: <h3><font color="#e00000">OpenBSD 2.6 Security Advisories</font></h3>
1.119 deraadt 1104: These are the OpenBSD 2.6 advisories -- all these problems are solved
1.294 david 1105: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.119 deraadt 1106: OpenBSD 2.5 advisories listed below are fixed in OpenBSD 2.6.
1107:
1108: <p>
1109: <ul>
1.294 david 1110: <li><a href="errata26.html#semconfig">May 26, 2000:
1.130 deraadt 1111: SYSV semaphore support contained an undocumented system call
1.131 deraadt 1112: which could wedge semaphore-using processes from exiting. (patch included)</a>
1.294 david 1113: <li><a href="errata26.html#ipf">May 25, 2000:
1.127 kjell 1114: Improper use of ipf <i>keep-state</i> rules can result
1115: in firewall rules being bypassed. (patch included)</a>
1.294 david 1116: <li><a href="errata26.html#xlockmore">May 25, 2000:
1.125 deraadt 1117: xlockmore has a bug which a localhost attacker can use to gain
1118: access to the encrypted root password hash (which is normally
1.245 miod 1119: encoded using blowfish</a> (see
1.294 david 1120: <a href="http://www.openbsd.org/cgi-bin/man.cgi?query=crypt&sektion=3">
1.125 deraadt 1121: crypt(3)</a>)
1.245 miod 1122: (patch included).
1.294 david 1123: <li><a href="errata26.html#procfs">Jan 20, 2000:
1.123 deraadt 1124: Systems running with procfs enabled and mounted are
1125: vulnerable to a very tricky exploit. procfs is not
1126: mounted by default.
1127: (patch included).</a>
1.294 david 1128: <li><a href="errata26.html#sendmail">Dec 4, 1999:
1.296 david 1129: Sendmail permitted any user to cause an aliases file wrap,
1.190 mpech 1130: thus exposing the system to a race where the aliases file
1131: did not exist.
1.119 deraadt 1132: (patch included).</a>
1.294 david 1133: <li><a href="errata26.html#poll">Dec 4, 1999:
1.190 mpech 1134: Various bugs in poll(2) may cause a kernel crash.</a>
1.294 david 1135: <li><a href="errata26.html#sslUSA">Dec 2, 1999:
1.120 deraadt 1136: A buffer overflow in the RSAREF code included in the
1137: USA version of libssl, is possibly exploitable in
1138: httpd, ssh, or isakmpd, if SSL/RSA features are enabled.
1.124 deraadt 1139: (patch included).<br></a>
1140: <strong>Update:</strong> Turns out that this was not exploitable
1141: in any of the software included in OpenBSD 2.6.
1.294 david 1142: <li><a href="errata26.html#ifmedia">Nov 9, 1999:
1.190 mpech 1143: Any user could change interface media configurations, resulting in
1144: a localhost denial of service attack.
1.121 deraadt 1145: (patch included).</a>
1.119 deraadt 1146: </ul>
1147:
1148: <p>
1149: <li>
1.288 matthieu 1150: <a name="25"></a>
1.106 deraadt 1151:
1.294 david 1152: <h3><font color="#e00000">OpenBSD 2.5 Security Advisories</font></h3>
1.93 deraadt 1153: These are the OpenBSD 2.5 advisories -- all these problems are solved
1.294 david 1154: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.93 deraadt 1155: OpenBSD 2.4 advisories listed below are fixed in OpenBSD 2.5.
1156:
1.96 deraadt 1157: <p>
1.104 deraadt 1158: <ul>
1.294 david 1159: <li><a href="errata25.html#cron">Aug 30, 1999:
1.103 deraadt 1160: In cron(8), make sure argv[] is NULL terminated in the
1161: fake popen() and run sendmail as the user, not as root.
1162: (patch included).</a>
1.294 david 1163: <li><a href="errata25.html#miscfs">Aug 12, 1999: The procfs and fdescfs
1.101 deraadt 1164: filesystems had an overrun in their handling of uio_offset
1165: in their readdir() routines. (These filesystems are not
1166: enabled by default). (patch included).</a>
1.294 david 1167: <li><a href="errata25.html#profil">Aug 9, 1999: Stop profiling (see profil(2))
1.100 deraadt 1168: when we execve() a new process. (patch included).</a>
1.294 david 1169: <li><a href="errata25.html#ipsec_in_use">Aug 6, 1999: Packets that should have
1.98 deraadt 1170: been handled by IPsec may be transmitted as cleartext.
1171: PF_KEY SA expirations may leak kernel resources.
1172: (patch included).</a>
1.294 david 1173: <li><a href="errata25.html#rc">Aug 5, 1999: In /etc/rc, use mktemp(1) for
1.97 deraadt 1174: motd re-writing and change the find(1) to use -execdir
1175: (patch included).</a>
1.294 david 1176: <li><a href="errata25.html#chflags">Jul 30, 1999: Do not permit regular
1.95 deraadt 1177: users to chflags(2) or fchflags(2) on character or block devices
1178: which they may currently be the owner of (patch included).</a>
1.294 david 1179: <li><a href="errata25.html#nroff">Jul 27, 1999: Cause groff(1) to be invoked
1.95 deraadt 1180: with the -S flag, when called by nroff(1) (patch included).</a>
1.93 deraadt 1181: </ul>
1182:
1.106 deraadt 1183: <p>
1184: <li>
1.288 matthieu 1185: <a name="24"></a>
1.235 miod 1186:
1.294 david 1187: <h3><font color="#e00000">OpenBSD 2.4 Security Advisories</font></h3>
1.75 deraadt 1188: These are the OpenBSD 2.4 advisories -- all these problems are solved
1.294 david 1189: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.75 deraadt 1190: OpenBSD 2.3 advisories listed below are fixed in OpenBSD 2.4.
1191:
1.96 deraadt 1192: <p>
1.75 deraadt 1193: <ul>
1.294 david 1194: <li><a href="errata24.html#poll">Mar 22, 1999: The nfds argument for poll(2) needs
1.91 deraadt 1195: to be constrained, to avoid kvm starvation (patch included).</a>
1.294 david 1196: <li><a href="errata24.html#tss">Mar 21, 1999: A change in TSS handling stops
1.91 deraadt 1197: another kernel crash case caused by the <strong>crashme</strong>
1198: program (patch included).</a>
1.294 david 1199: <li><a href="errata24.html#nlink">Feb 25, 1999: An unbounded increment on the
1.90 deraadt 1200: nlink value in FFS and EXT2FS filesystems can cause a system crash.
1.89 deraadt 1201: (patch included).</a>
1.294 david 1202: <li><a href="errata24.html#ping">Feb 23, 1999: Yet another buffer overflow
1.88 deraadt 1203: existed in ping(8). (patch included).</a>
1.294 david 1204: <li><a href="errata24.html#ipqrace">Feb 19, 1999: ipintr() had a race in use of
1.87 deraadt 1205: the ipq, which could permit an attacker to cause a crash.
1206: (patch included).</a>
1.294 david 1207: <li><a href="errata24.html#accept">Feb 17, 1999: A race condition in the
1.86 deraadt 1208: kernel between accept(2) and select(2) could permit an attacker
1209: to hang sockets from remote.
1210: (patch included).</a>
1.294 david 1211: <li><a href="errata24.html#maxqueue">Feb 17, 1999: IP fragment assembly can
1.85 deraadt 1212: bog the machine excessively and cause problems.
1213: (patch included).</a>
1.294 david 1214: <li><a href="errata24.html#trctrap">Feb 12, 1999: i386 T_TRCTRAP handling and
1.84 deraadt 1215: DDB interacted to possibly cause a crash.
1216: (patch included).</a>
1.294 david 1217: <li><a href="errata24.html#rst">Feb 11, 1999: TCP/IP RST handling was sloppy.
1.83 deraadt 1218: (patch included).</a>
1.294 david 1219: <li><a href="errata24.html#bootpd">Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 1220: problem in bootpd(8). (patch included).</a>
1.294 david 1221: <li><a href="errata24.html#termcap">Nov 19, 1998: There is a possibly locally
1.82 deraadt 1222: exploitable problem relating to environment variables in termcap
1223: and curses. (patch included).</a>
1.294 david 1224: <li><a href="errata24.html#tcpfix">Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 1225: bug in the TCP decoding kernel. (patch included).</a>
1.75 deraadt 1226: </ul>
1227:
1.106 deraadt 1228: <p>
1229: <li>
1.288 matthieu 1230: <a name="23"></a>
1.235 miod 1231:
1.294 david 1232: <h3><font color="#e00000">OpenBSD 2.3 Security Advisories</font></h3>
1.73 deraadt 1233: These are the OpenBSD 2.3 advisories -- all these problems are solved
1.294 david 1234: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.73 deraadt 1235: OpenBSD 2.2 advisories listed below are fixed in OpenBSD 2.3.
1.53 matthieu 1236:
1.96 deraadt 1237: <p>
1.53 matthieu 1238: <ul>
1.294 david 1239: <li><a href="errata23.html#bootpd">Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 1240: problem in bootpd(8). (patch included).</a>
1.294 david 1241: <li><a href="errata23.html#tcpfix">Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 1242: bug in the TCP decoding kernel. (patch included).</a>
1.294 david 1243: <li><a href="errata23.html#resolver">August 31, 1998: A benign looking resolver
1.190 mpech 1244: buffer overflow bug was re-introduced accidentally (patches included).</a>
1.294 david 1245: <li><a href="errata23.html#chpass">Aug 2, 1998:
1.190 mpech 1246: chpass(1) has a file descriptor leak which allows an
1247: attacker to modify /etc/master.passwd.</a>
1.294 david 1248: <li><a href="errata23.html#inetd">July 15, 1998: Inetd had a file descriptor leak.</a>
1249: <li><a href="errata23.html#fdalloc">Jul 2, 1998: setuid and setgid processes
1.72 deraadt 1250: should not be executed with fd slots 0, 1, or 2 free.
1251: (patch included).</a>
1.294 david 1252: <li><a href="errata23.html#xlib">June 6, 1998: Further problems with the X
1.71 deraadt 1253: libraries (patches included).</a>
1.294 david 1254: <li><a href="errata23.html#kill">May 17, 1998: kill(2) of setuid/setgid target
1.66 deraadt 1255: processes too permissive (4th revision patch included).</a>
1.294 david 1256: <li><a href="errata23.html#immutable">May 11, 1998: mmap() permits partial bypassing
1.60 deraadt 1257: of immutable and append-only file flags. (patch included).</a>
1.294 david 1258: <li><a href="errata23.html#ipsec">May 5, 1998: Incorrect handling of IPSEC packets
1.190 mpech 1259: if IPSEC is enabled (patch included).</a>
1.294 david 1260: <li><a href="errata23.html#xterm-xaw">May 1, 1998: Buffer overflow in xterm and Xaw
1.58 deraadt 1261: (CERT advisory VB-98.04) (patch included).</a>
1.53 matthieu 1262: </ul>
1.9 deraadt 1263:
1.106 deraadt 1264: <p>
1265: <li>
1.288 matthieu 1266: <a name="22"></a>
1.235 miod 1267:
1.294 david 1268: <h3><font color="#e00000">OpenBSD 2.2 Security Advisories</font></h3>
1.45 deraadt 1269: These are the OpenBSD 2.2 advisories. All these problems are solved
1.294 david 1270: in <a href="23.html">OpenBSD 2.3</a>. Some of these problems
1.45 deraadt 1271: still exist in other operating systems. (The supplied patches are for
1272: OpenBSD 2.2; they may or may not work on OpenBSD 2.1).
1.9 deraadt 1273:
1.96 deraadt 1274: <p>
1.9 deraadt 1275: <ul>
1.294 david 1276: <li><a href="errata22.html#ipsec">May 5, 1998: Incorrect handling of IPSEC
1.72 deraadt 1277: packets if IPSEC is enabled (patch included).</a>
1.294 david 1278: <li><a href="errata22.html#xterm-xaw">May 1, 1998: Buffer overflow in xterm
1.72 deraadt 1279: and Xaw (CERT advisory VB-98.04) (patch included).</a>
1.294 david 1280: <li><a href="errata22.html#uucpd">Apr 22, 1998: Buffer overflow in uucpd
1.72 deraadt 1281: (patch included).</a>
1.294 david 1282: <li><a href="errata22.html#rmjob">Apr 22, 1998: Buffer mismanagement in lprm
1.72 deraadt 1283: (patch included).</a>
1.294 david 1284: <li><a href="errata22.html#ping">Mar 31, 1998: Overflow in ping -R (patch included).</a>
1285: <li><a href="errata22.html#named">Mar 30, 1998: Overflow in named fake-iquery
1.59 deraadt 1286: (patch included).</a>
1.294 david 1287: <li><a href="errata22.html#mountd">Mar 2, 1998: Accidental NFS filesystem
1.72 deraadt 1288: export (patch included).</a>
1.112 philen 1289: <li><a href="advisories/mmap.txt">Feb 26, 1998: Read-write mmap() flaw.</a>
1.294 david 1290: Revision 3 of the patch is available <a href="errata22.html#mmap">here</a>
1.112 philen 1291: <li><a href="advisories/sourceroute.txt">Feb 19, 1998: Sourcerouted Packet
1.59 deraadt 1292: Acceptance.</a>
1.294 david 1293: A patch is available <a href="errata22.html#sourceroute">here</a>.
1294: <li><a href="errata22.html#ruserok">Feb 13, 1998: Setuid coredump & Ruserok()
1.72 deraadt 1295: flaw (patch included).</a>
1.294 david 1296: <li><a href="errata22.html#ldso">Feb 9, 1998: MIPS ld.so flaw (patch included).</a>
1.1 deraadt 1297: </ul>
1298:
1.106 deraadt 1299: <p>
1300: <li>
1.288 matthieu 1301: <a name="21"></a>
1.235 miod 1302:
1.294 david 1303: <h3><font color="#e00000">OpenBSD 2.1 Security Advisories</font></h3>
1.52 deraadt 1304: These are the OpenBSD 2.1 advisories. All these problems are solved
1.294 david 1305: in <a href="22.html">OpenBSD 2.2</a>. Some of these problems still
1.52 deraadt 1306: exist in other operating systems. (If you are running OpenBSD 2.1, we
1307: would strongly recommend an upgrade to the newest release, as this
1308: patch list only attempts at fixing the most important security
1309: problems. In particular, OpenBSD 2.2 fixes numerous localhost
1310: security problems. Many of those problems were solved in ways which
1311: make it hard for us to provide patches).
1312:
1.96 deraadt 1313: <p>
1.52 deraadt 1314: <ul>
1.112 philen 1315: <li><a href="advisories/signals.txt">Sep 15, 1997: Deviant Signals (patch included)</a>
1316: <li><a href="advisories/rfork.txt">Aug 2, 1997: Rfork() system call flaw
1.59 deraadt 1317: (patch included)</a>
1.112 philen 1318: <li><a href="advisories/procfs.txt">Jun 24, 1997: Procfs flaws (patch included)</a>
1.52 deraadt 1319: </ul>
1.51 deraadt 1320:
1.106 deraadt 1321: <p>
1322: <li>
1.288 matthieu 1323: <a name="20"></a>
1.235 miod 1324:
1.294 david 1325: <h3><font color="#e00000">OpenBSD 2.0 Security Advisories</font></h3>
1.99 deraadt 1326: These are the OpenBSD 2.0 advisories. All these problems are solved
1.294 david 1327: in <a href="21.html">OpenBSD 2.1</a>. Some of these problems still
1.99 deraadt 1328: exist in other operating systems. (If you are running OpenBSD 2.0, we
1329: commend you for being there back in the old days!, but you're really
1330: missing out if you don't install a new version!)
1331:
1332: <p>
1333: <ul>
1.112 philen 1334: <li><a href="advisories/res_random.txt">April 22, 1997: Predictable IDs in the
1.99 deraadt 1335: resolver (patch included)</a>
1336: <li>Many others... if people can hunt them down, please let me know
1337: and we'll put them up here.
1338: </ul>
1.51 deraadt 1339: <p>
1.106 deraadt 1340:
1.288 matthieu 1341: <a name="watching"></a>
1.294 david 1342: <li><h3><font color="#e00000">Watching our Changes</font></h3><p>
1.106 deraadt 1343:
1.21 deraadt 1344: Since we take a proactive stance with security, we are continually
1345: finding and fixing new security problems. Not all of these problems
1.80 espie 1346: get widely reported because (as stated earlier) many of them are not
1.45 deraadt 1347: confirmed to be exploitable; many simple bugs we fix do turn out to
1348: have security consequences we could not predict. We do not have the
1349: time resources to make these changes available in the above format.<p>
1.21 deraadt 1350:
1351: Thus there are usually minor security fixes in the current source code
1352: beyond the previous major OpenBSD release. We make a limited
1.45 deraadt 1353: guarantee that these problems are of minimal impact and unproven
1.44 ian 1354: exploitability. If we discover that a problem definitely matters for
1.45 deraadt 1355: security, patches will show up here <strong>VERY</strong> quickly.<p>
1.21 deraadt 1356:
1.45 deraadt 1357: People who are really concerned with security can do a number of
1358: things:<p>
1.21 deraadt 1359:
1360: <ul>
1361: <li>If you understand security issues, watch our
1.294 david 1362: <a href="mail.html">source-changes mailing list</a> and keep an
1.23 deraadt 1363: eye out for things which appear security related. Since
1.21 deraadt 1364: exploitability is not proven for many of the fixes we make,
1365: do not expect the relevant commit message to say "SECURITY FIX!".
1366: If a problem is proven and serious, a patch will be available
1367: here very shortly after.
1.161 horacio 1368: <li>In addition to source changes, you can watch our <a href="mail.html">
1.160 ericj 1369: security-announce mailing list</a> which will notify you for every
1.186 ian 1370: security related item that the OpenBSD team deems as a possible threat,
1.160 ericj 1371: and instruct you on how to patch the problem.
1.21 deraadt 1372: <li>Track our current source code tree, and teach yourself how to do a
1.29 deraadt 1373: complete system build from time to time (read /usr/src/Makefile
1374: carefully). Users can make the assumption that the current
1375: source tree always has stronger security than the previous release.
1.45 deraadt 1376: However, building your own system from source code is not trivial;
1.265 miod 1377: it is nearly 600MB of source code, and problems do occur as we
1.45 deraadt 1378: transition between major releases.
1.115 ericj 1379: <li>Install a binary snapshot for your
1.80 espie 1380: architecture, which are made available fairly often. For
1.29 deraadt 1381: instance, an i386 snapshot is typically made available weekly.
1.21 deraadt 1382: </ul>
1383:
1.9 deraadt 1384: <p>
1.288 matthieu 1385: <a name="reporting"></a>
1.294 david 1386: <li><h3><font color="#e00000">Reporting problems</font></h3><p>
1.3 deraadt 1387:
1.5 deraadt 1388: <p> If you find a new security problem, you can mail it to
1.294 david 1389: <a href="mailto:deraadt@openbsd.org">deraadt@openbsd.org</a>.
1.7 deraadt 1390: <br>
1.5 deraadt 1391: If you wish to PGP encode it (but please only do so if privacy is very
1.112 philen 1392: urgent, since it is inconvenient) use this <a href="advisories/pgpkey.txt">pgp key</a>.
1.5 deraadt 1393:
1.107 deraadt 1394: <p>
1.288 matthieu 1395: <a name="papers"></a>
1.294 david 1396: <li><h3><font color="#e00000">Further Reading</font></h3><p>
1.107 deraadt 1397:
1398: A number of papers have been written by OpenBSD team members, about security
1399: related changes they have done in OpenBSD. The postscript versions of these
1.108 deraadt 1400: documents are available as follows.<p>
1.107 deraadt 1401:
1402: <ul>
1.113 deraadt 1403: <li>A Future-Adaptable Password Scheme.<br>
1.294 david 1404: <a href="events.html#usenix99">Usenix 1999</a>,
1405: by <a href="mailto:provos@openbsd.org">Niels Provos</a>,
1406: <a href="mailto:dm@openbsd.org">David Mazieres</a>.<br>
1407: <a href="papers/bcrypt-paper.ps">paper</a> and
1408: <a href="papers/bcrypt-slides.ps">slides</a>.
1.113 deraadt 1409: <p>
1410: <li>Cryptography in OpenBSD: An Overview.<br>
1.294 david 1411: <a href="events.html#usenix99">Usenix 1999</a>,
1412: by <a href="mailto:deraadt@openbsd.org">Theo de Raadt</a>,
1413: <a href="mailto:niklas@openbsd.org">Niklas Hallqvist</a>,
1414: <a href="mailto:art@openbsd.org">Artur Grabowski</a>,
1415: <a href="mailto:angelos@openbsd.org">Angelos D. Keromytis</a>,
1416: <a href="mailto:provos@openbsd.org">Niels Provos</a>.<br>
1417: <a href="papers/crypt-paper.ps">paper</a> and
1418: <a href="papers/crypt-slides.ps">slides</a>.
1.113 deraadt 1419: <p>
1420: <li>strlcpy and strlcat -- consistent, safe, string copy and concatenation.<br>
1.294 david 1421: <a href="events.html#usenix99">Usenix 1999</a>,
1422: by <a href="mailto:millert@openbsd.org">Todd C. Miller</a>,
1423: <a href="mailto:deraadt@openbsd.org">Theo de Raadt</a>.<br>
1424: <a href="papers/strlcpy-paper.ps">paper</a> and
1425: <a href="papers/strlcpy-slides.ps">slides</a>.
1.113 deraadt 1426: <p>
1.118 deraadt 1427: <li>Dealing with Public Ethernet Jacks-Switches, Gateways, and Authentication.<br>
1.294 david 1428: <a href="events.html#lisa99">LISA 1999</a>,
1429: by <a href="mailto:beck@openbsd.org">Bob Beck</a>.<br>
1430: <a href="papers/authgw-paper.ps">paper</a> and
1431: <a href="papers/authgw-slides.ps">slides</a>.
1.118 deraadt 1432: <p>
1.153 jufi 1433: <li>Encrypting Virtual Memory<br>
1.294 david 1434: <a href="events.html#sec2000">Usenix Security 2000</a>,
1435: <a href="mailto:provos@openbsd.org">Niels Provos</a>.<br>
1436: <a href="papers/swapencrypt.ps">paper</a> and
1437: <a href="papers/swapencrypt-slides.ps">slides</a>.
1.142 deraadt 1438: <p>
1.107 deraadt 1439: </ul>
1.294 david 1440: </ul>
1.106 deraadt 1441:
1.2 deraadt 1442: <hr>
1.294 david 1443: <a href="index.html"><img height=24 width=24 src="back.gif" border=0 alt="OpenBSD"></a>
1444: <a href="mailto:www@openbsd.org">www@openbsd.org</a>
1.24 deraadt 1445: <br>
1.325 ! brad 1446: <small>$OpenBSD: security.html,v 1.324 2006/06/16 00:15:30 brad Exp $</small>
1.1 deraadt 1447:
1.24 deraadt 1448: </body>
1449: </html>
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