Annotation of www/security.html, Revision 1.321
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1.210 jsyn 16: <a href="index.html"><img alt="[OpenBSD]" height="30" width="141" src="images/smalltitle.gif" border="0"></a>
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>
! 235: <li><a href="errata.html#sendmail">Mar 25, 2006:
! 236: A race condition has been reported to exist in the handling by sendmail
! 237: of asynchronous signals.</a>
! 238: </ul>
! 239:
! 240: <li>
1.318 deraadt 241: <a name="38"></a>
242:
243: <h3><font color="#e00000">OpenBSD 3.8 Security Advisories</font></h3>
244: These are the OpenBSD 3.8 advisories -- all these problems are solved
245: in <a href=anoncvs.html>OpenBSD current</a> and the
246: <a href=stable.html>patch branch</a>.
247:
248: <p>
249: <ul>
1.321 ! brad 250: <li><a href="errata38.html#sendmail">Mar 25, 2006:
! 251: A race condition has been reported to exist in the handling by sendmail
! 252: of asynchronous signals.</a>
! 253: <li><a href="errata38.html#ssh">Feb 12, 2006:
1.320 brad 254: Josh Bressers has reported a weakness in OpenSSH caused due to the
255: insecure use of the system(3) function in scp(1) when performing copy
256: operations using filenames that are supplied by the user from the
257: command line.</a>
1.321 ! brad 258: <li><a href="errata38.html#fd">Jan 5, 2006:
1.319 brad 259: Do not allow users to trick suid programs into re-opening files via
260: /dev/fd.</a>
1.321 ! brad 261: <li><a href="errata38.html#perl">Jan 5, 2006:
1.319 brad 262: A buffer overflow has been found in the Perl interpreter with the
263: sprintf function which may be exploitable under certain conditions.</a>
1.318 deraadt 264: </ul>
265:
266: <li>
1.312 david 267: <a name="37"></a>
268:
269: <h3><font color="#e00000">OpenBSD 3.7 Security Advisories</font></h3>
270: These are the OpenBSD 3.7 advisories -- all these problems are solved
271: in <a href=anoncvs.html>OpenBSD current</a> and the
272: <a href=stable.html>patch branch</a>.
273:
274: <p>
275: <ul>
1.321 ! brad 276: <li><a href="errata37.html#sendmail">Mar 25, 2006:
! 277: A race condition has been reported to exist in the handling by sendmail
! 278: of asynchronous signals.</a>
1.320 brad 279: <li><a href="errata37.html#ssh">Feb 12, 2006:
280: Josh Bressers has reported a weakness in OpenSSH caused due to the
281: insecure use of the system(3) function in scp(1) when performing copy
282: operations using filenames that are supplied by the user from the
283: command line.</a>
1.319 brad 284: <li><a href="errata37.html#fd">Jan 5, 2006:
285: Do not allow users to trick suid programs into re-opening files via
286: /dev/fd.</a>
287: <li><a href="errata37.html#perl">Jan 5, 2006:
288: A buffer overflow has been found in the Perl interpreter with the
289: sprintf function which may be exploitable under certain conditions.</a>
1.318 deraadt 290: <li><a href="errata37.html#libz2">Jul 21, 2005:
1.317 millert 291: Fix another buffer overflow in the zlib library that may be exploitable.</a>
1.318 deraadt 292: <li><a href="errata37.html#libz">Jul 6, 2005:
1.316 millert 293: Fix a buffer overflow in the zlib library that may be exploitable.</a>
1.318 deraadt 294: <li><a href="errata37.html#sudo">Jun 20, 2005:
1.316 millert 295: Fix a race condition in sudo(8) that could allow a user
1.315 millert 296: to run arbitrary commands.</a>
1.318 deraadt 297: <li><a href="errata37.html#cvs">Jun 7, 2005:
1.313 brad 298: Fix a buffer overflow, memory leaks, and NULL pointer
299: dereference in cvs(1).</a>
1.312 david 300: </ul>
301:
302: <li>
1.301 miod 303: <a name="36"></a>
304:
305: <h3><font color="#e00000">OpenBSD 3.6 Security Advisories</font></h3>
306: These are the OpenBSD 3.6 advisories -- all these problems are solved
307: in <a href=anoncvs.html>OpenBSD current</a> and the
308: <a href=stable.html>patch branch</a>.
309:
310: <p>
1.302 markus 311: <ul>
1.317 millert 312: <li><a href="errata36.html#libz2">Jul 21, 2005:
313: Fix another buffer overflow in the zlib library that may be exploitable.</a>
1.316 millert 314: <li><a href="errata36.html#libz">Jul 6, 2005:
315: Fix a buffer overflow in the zlib library that may be exploitable.</a>
1.315 millert 316: <li><a href="errata36.html#sudo">Jun 20, 2005:
1.316 millert 317: Fix a race condition in sudo(8) that could allow a user
1.315 millert 318: to run arbitrary commands.</a>
1.311 deraadt 319: <li><a href="errata36.html#cvs">Apr 28, 2005:
1.310 brad 320: Fix a buffer overflow, memory leaks, and NULL pointer
321: dereference in cvs(1).</a>
1.311 deraadt 322: <li><a href="errata36.html#telnet">Mar 30, 2005:
1.309 brad 323: Due to buffer overflows in telnet(1), a malicious
324: server or man-in-the-middle attack could allow
325: execution of arbitrary code with the privileges of
326: the user invoking telnet(1).</a>
1.311 deraadt 327: <li><a href="errata36.html#copy">Mar 16, 2005:
1.307 brad 328: More stringent checking should be done in the copy(9)
329: functions to prevent their misuse.</a>
1.311 deraadt 330: <li><a href="errata36.html#locore">Feb 28, 2005:
1.306 brad 331: More stringent checking should be done in the copy(9)
332: functions to prevent their misuse.</a>
1.311 deraadt 333: <li><a href="errata36.html#httpd">Jan 12, 2005:
1.304 brad 334: httpd(8)'s mod_include module fails to properly validate
335: the length of user supplied tag strings prior to copying
1.305 brad 336: them to a local buffer, causing a buffer overflow.</a>
1.311 deraadt 337: <li><a href="errata36.html#pfkey">Dec 14, 2004:
1.302 markus 338: On systems running isakmpd(8) it is possible for a local
339: user to cause kernel memory corruption and system panic by
1.303 markus 340: setting ipsec(4) credentials on a socket.</a>
1.302 markus 341: </ul>
1.301 miod 342:
343: <p>
1.314 miod 344: OpenBSD 3.5 and earlier releases are not supported anymore. The following
345: paragraphs only list advisories issued while they were maintained; these
346: releases are likely to be affected by the advisories for more recent releases.
347: <br>
348:
1.301 miod 349: <li>
1.288 matthieu 350: <a name="35"></a>
1.279 deraadt 351:
1.294 david 352: <h3><font color="#e00000">OpenBSD 3.5 Security Advisories</font></h3>
1.279 deraadt 353: These are the OpenBSD 3.5 advisories -- all these problems are solved
1.314 miod 354: in <a href="anoncvs.html">OpenBSD current</a>. The
355: <a href="stable.html">patch branch</a> for 3.5 is no longer being maintained,
356: you should update your machine.
1.279 deraadt 357:
358: <p>
359: <ul>
1.310 brad 360: <li><a href="errata35.html#cvs4">Apr 28, 2005:
361: Fix a buffer overflow, memory leaks, and NULL pointer
362: dereference in cvs(1).</a>
1.309 brad 363: <li><a href="errata35.html#telnet">Mar 30, 2005:
364: Due to buffer overflows in telnet(1), a malicious
365: server or man-in-the-middle attack could allow
366: execution of arbitrary code with the privileges of
367: the user invoking telnet(1).</a>
1.308 brad 368: <li><a href="errata35.html#copy">Mar 16, 2005:
1.307 brad 369: More stringent checking should be done in the copy(9)
370: functions to prevent their misuse.</a>
1.306 brad 371: <li><a href="errata35.html#locore">Feb 28, 2005:
372: More stringent checking should be done in the copy(9)
373: functions to prevent their misuse.</a>
1.304 brad 374: <li><a href="errata35.html#httpd3">Jan 12, 2005:
375: httpd(8)'s mod_include module fails to properly validate
376: the length of user supplied tag strings prior to copying
1.305 brad 377: them to a local buffer, causing a buffer overflow.</a>
1.302 markus 378: <li><a href="errata35.html#pfkey">Dec 14, 2004:
379: On systems running isakmpd(8) it is possible for a local
380: user to cause kernel memory corruption and system panic by
1.303 markus 381: setting ipsec(4) credentials on a socket.</a>
1.301 miod 382: <li><a href="errata35.html#radius">Sep 20, 2004:
1.299 millert 383: Radius-based authentication is vulnerable to spoofed replies.</a>
1.301 miod 384: <li><a href="errata35.html#xpm">Sep 16, 2004:
1.298 brad 385: The Xpm library has vulnerabilities when parsing malicious images.</a>
1.301 miod 386: <li><a href="errata35.html#httpd2"> Sep 10, 2004:
1.297 brad 387: httpd(8)'s mod_rewrite module can be made to write one zero byte in
388: an arbitrary memory position outside of a char array, causing a DoS
389: or possibly buffer overflows.</a>
1.301 miod 390: <li><a href="errata35.html#httpd"> Jun 12, 2004:
1.300 deraadt 391: Multiple vulnerabilities have been found in httpd(8) / mod_ssl.</a>
1.301 miod 392: <li><a href="errata35.html#isakmpd"> Jun 10, 2004:
1.291 hshoexer 393: isakmpd(8) still has issues with unauthorized SA deletion,
1.293 brad 394: an attacker can delete IPsec tunnels at will.</a>
1.301 miod 395: <li><a href="errata35.html#cvs3"> Jun 9, 2004:
1.290 millert 396: Multiple remote vulnerabilities have been found in the cvs(1)
397: server which can be used by CVS clients to crash or execute
1.293 brad 398: arbitrary code on the server.</a>
1.301 miod 399: <li><a href="errata35.html#kerberos"> May 30, 2004:
1.289 beck 400: kdc(8) performs inadequate checking of request fields, leading
401: to the possibility of principal impersonation from other
402: Kerberos realms if they are trusted with a cross-realm trust.</a>
1.301 miod 403: <li><a href="errata35.html#xdm"> May 26, 2004:
1.287 matthieu 404: xdm(1) ignores the requestPort resource and creates a
1.293 brad 405: listening socket regardless of the setting in xdm-config.</a>
1.301 miod 406: <li><a href="errata35.html#cvs2"> May 20, 2004:
1.286 otto 407: A buffer overflow in the cvs(1) server has been found,
408: which can be used by CVS clients to execute arbitrary code on
1.293 brad 409: the server.</a>
1.301 miod 410: <li><a href="errata35.html#procfs"> May 13, 2004:
1.282 tedu 411: Integer overflow problems were found in procfs, allowing
1.293 brad 412: reading of arbitrary kernel memory.</a>
1.301 miod 413: <li><a href="errata35.html#cvs"> May 5, 2004:
1.281 otto 414: Pathname validation problems have been found in cvs(1),
415: allowing clients and servers access to files outside the
1.293 brad 416: repository or local CVS tree.</a>
1.279 deraadt 417: </ul>
418:
419: <p>
420: <li>
1.288 matthieu 421: <a name="34"></a>
1.261 david 422:
1.294 david 423: <h3><font color="#e00000">OpenBSD 3.4 Security Advisories</font></h3>
1.261 david 424: These are the OpenBSD 3.4 advisories -- all these problems are solved
1.301 miod 425: in <a href="anoncvs.html">OpenBSD current</a>. The
426: <a href="stable.html">patch branch</a> for 3.4 is no longer being maintained,
427: you should update your machine.
1.261 david 428: <p>
429: <ul>
1.302 markus 430: <li><a href="errata34.html#pfkey">Dec 14, 2004:
431: On systems running isakmpd(8) it is possible for a local
432: user to cause kernel memory corruption and system panic by
1.303 markus 433: setting ipsec(4) credentials on a socket.</a>
1.298 brad 434: <li><a href="errata34.html#xpm">Sep 16, 2004:
435: The Xpm library has vulnerabilities when parsing malicious images.</a>
1.297 brad 436: <li><a href="errata34.html#httpd4"> Sep 10, 2004:
437: httpd(8)'s mod_rewrite module can be made to write one zero byte in
438: an arbitrary memory position outside of a char array, causing a DoS
439: or possibly buffer overflows.</a>
1.294 david 440: <li><a href="errata34.html#httpd3"> Jun 12, 2004:
1.300 deraadt 441: Multiple vulnerabilities have been found in httpd(8) / mod_ssl.</a>
1.294 david 442: <li><a href="errata34.html#isakmpd3"> Jun 10, 2004:
1.292 brad 443: isakmpd(8) still has issues with unauthorized SA deletion,
1.293 brad 444: an attacker can delete IPsec tunnels at will.</a>
1.294 david 445: <li><a href="errata34.html#cvs3"> Jun 9, 2004:
1.290 millert 446: Multiple remote vulnerabilities have been found in the cvs(1)
447: server which can be used by CVS clients to crash or execute
1.293 brad 448: arbitrary code on the server.</a>
1.294 david 449: <li><a href="errata34.html#kerberos"> May 30, 2004:
1.289 beck 450: kdc(8) performs inadequate checking of request fields, leading
451: to the possibility of principal impersonation from other
452: Kerberos realms if they are trusted with a cross-realm trust.</a>
1.294 david 453: <li><a href="errata34.html#cvs2"> May 20, 2004:
1.286 otto 454: A buffer overflow in the cvs(1) server has been found,
455: which can be used by CVS clients to execute arbitrary code on
456: the server.</a>
1.294 david 457: <li><a href="errata34.html#procfs"> May 13, 2004:
1.282 tedu 458: Integer overflow problems were found in procfs, allowing
459: reading of arbitrary kernel memory.</a>
1.294 david 460: <li><a href="errata34.html#cvs"> May 5, 2004:
1.281 otto 461: Pathname validation problems have been found in cvs(1),
462: allowing clients and servers access to files outside the
463: repository or local CVS tree.</a>
1.294 david 464: <li><a href="errata34.html#openssl"> March 17, 2004:
1.277 millert 465: A missing check for a NULL-pointer dereference may allow a
1.281 otto 466: remote attacker to crash applications using OpenSSL.</a>
1.294 david 467: <li><a href="errata34.html#isakmpd2"> March 17, 2004:
1.276 brad 468: Defects in the payload validation and processing functions of
469: isakmpd have been discovered. An attacker could send malformed
470: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.294 david 471: <li><a href="errata34.html#httpd2"> March 13, 2004:
1.275 brad 472: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
473: access module, using IP addresses without a netmask on big endian
474: 64-bit platforms causes the rules to fail to match.</a>
1.294 david 475: <li><a href="errata34.html#ip6"> February 8, 2004:
1.272 dhartmei 476: An IPv6 MTU handling problem exists that could be used by an
477: attacker to cause a denial of service attack.</a>
1.294 david 478: <li><a href="errata34.html#sysvshm"> February 5, 2004:
1.271 millert 479: A reference counting bug in shmat(2) could be used to write to
480: kernel memory under certain circumstances.</a>
1.294 david 481: <li><a href="errata34.html#isakmpd">January 13, 2004:
1.266 brad 482: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 483: by Thomas Walpuski.</a>
1.294 david 484: <li><a href="errata34.html#ibcs2">November 17, 2003:
1.264 henning 485: It may be possible for a local user to overrun the stack in
486: compat_ibcs2(8) and cause a kernel panic.</a>
1.294 david 487: <li><a href="errata34.html#asn1">November 1, 2003:
1.262 margarid 488: The use of certain ASN.1 encodings or malformed public keys may
489: allow an attacker to mount a denial of service attack against
490: applications linked with ssl(3).</a>
1.261 david 491: </ul>
492:
493: <li>
1.288 matthieu 494: <a name="33"></a>
1.246 deraadt 495:
1.294 david 496: <h3><font color="#e00000">OpenBSD 3.3 Security Advisories</font></h3>
1.246 deraadt 497: These are the OpenBSD 3.3 advisories -- all these problems are solved
1.294 david 498: in <a href="anoncvs.html">OpenBSD current</a>. The
499: <a href="stable.html">patch branch</a> for 3.3 is no longer being maintained,
1.284 otto 500: you should update your machine.
1.246 deraadt 501: <p>
502: <ul>
1.294 david 503: <li><a href="errata33.html#cvs"> May 5, 2004:
1.281 otto 504: Pathname validation problems have been found in cvs(1),
505: allowing clients and servers access to files outside the
506: repository or local CVS tree.</a>
1.294 david 507: <li><a href="errata33.html#openssl"> March 17, 2004:
1.277 millert 508: A missing check for a NULL-pointer dereference may allow a
1.281 otto 509: remote attacker to crash applications using OpenSSL.</a>
1.294 david 510: <li><a href="errata33.html#isakmpd2"> March 17, 2004:
1.276 brad 511: Defects in the payload validation and processing functions of
512: isakmpd have been discovered. An attacker could send malformed
513: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.294 david 514: <li><a href="errata33.html#httpd2"> March 13, 2004:
1.275 brad 515: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
516: access module, using IP addresses without a netmask on big endian
517: 64-bit platforms causes the rules to fail to match.</a>
1.294 david 518: <li><a href="errata33.html#ip6"> February 8, 2004:
1.275 brad 519: An IPv6 MTU handling problem exists that could be used by an
520: attacker to cause a denial of service attack.</a>
1.294 david 521: <li><a href="errata33.html#sysvshm"> February 5, 2004:
1.271 millert 522: A reference counting bug in shmat(2) could be used to write to
523: kernel memory under certain circumstances.</a>
1.294 david 524: <li><a href="errata33.html#isakmpd">January 15, 2004:
1.268 brad 525: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 526: by Thomas Walpuski.</a>
1.294 david 527: <li><a href="errata33.html#ibcs2">November 17, 2003:
1.264 henning 528: It may be possible for a local user to execute arbitrary code
529: resulting in escalation of privileges due to a stack overrun
530: in compat_ibcs2(8).</a>
1.294 david 531: <li><a href="errata33.html#asn1">October 1, 2003:
1.257 millert 532: The use of certain ASN.1 encodings or malformed public keys may
533: allow an attacker to mount a denial of service attack against
534: applications linked with ssl(3).</a>
1.294 david 535: <li><a href="errata33.html#pfnorm">September 24, 2003:
1.258 beck 536: Access of freed memory in pf(4) could be used to
1.260 margarid 537: remotely panic a machine using scrub rules.</a>
1.294 david 538: <li><a href="errata33.html#sendmail">September 17, 2003:
1.256 millert 539: A buffer overflow in the address parsing in
540: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 541: <li><a href="errata33.html#sshbuffer">September 16, 2003:
1.255 millert 542: OpenSSH versions prior to 3.7 contains a buffer management error
543: that is potentially exploitable.</a>
1.294 david 544: <li><a href="errata33.html#sysvsem">September 10, 2003:
1.254 millert 545: Root may be able to reduce the security level by taking advantage of
546: an integer overflow when the semaphore limits are made very large.</a>
1.294 david 547: <li><a href="errata33.html#semget">August 20, 2003:
1.252 millert 548: An improper bounds check in the kernel may allow a local user
549: to panic the kernel.</a>
1.294 david 550: <li><a href="errata33.html#realpath">August 4, 2003:
1.249 millert 551: An off-by-one error exists in the C library function realpath(3)
552: may allow an attacker to gain escalated privileges.</a>
1.246 deraadt 553: </ul>
554:
1.265 miod 555:
1.247 david 556: <p>
1.246 deraadt 557: <li>
1.288 matthieu 558: <a name="32"></a>
1.224 deraadt 559:
1.294 david 560: <h3><font color="#e00000">OpenBSD 3.2 Security Advisories</font></h3>
1.224 deraadt 561: These are the OpenBSD 3.2 advisories -- all these problems are solved
1.294 david 562: in <a href="anoncvs.html">OpenBSD current</a>. The
563: <a href="stable.html">patch branch</a> for 3.2 is no longer being maintained,
1.265 miod 564: you should update your machine.
1.224 deraadt 565: <p>
566: <ul>
1.294 david 567: <li><a href="errata32.html#asn1">October 1, 2003:
1.257 millert 568: The use of certain ASN.1 encodings or malformed public keys may
569: allow an attacker to mount a denial of service attack against
570: applications linked with ssl(3). This does not affect OpenSSH.</a>
1.294 david 571: <li><a href="errata32.html#pfnorm">September 24, 2003:
1.258 beck 572: Access of freed memory in pf(4) could be used to
1.260 margarid 573: remotely panic a machine using scrub rules.</a>
1.294 david 574: <li><a href="errata32.html#sendmail4">September 17, 2003:
1.256 millert 575: A buffer overflow in the address parsing in
576: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 577: <li><a href="errata32.html#sshbuffer">September 16, 2003:
1.255 millert 578: OpenSSH versions prior to 3.7 contains a buffer management error
579: that is potentially exploitable.</a>
1.294 david 580: <li><a href="errata32.html#sendmail3">August 25, 2003:
1.253 brad 581: Fix for a potential security issue in
582: sendmail(8) with respect to DNS maps.</a>
1.294 david 583: <li><a href="errata32.html#realpath">August 4, 2003:
1.249 millert 584: An off-by-one error exists in the C library function realpath(3)
585: may allow an attacker to gain escalated privileges.</a>
1.294 david 586: <li><a href="errata32.html#sendmail2">March 31, 2003:
1.244 miod 587: A buffer overflow in the address parsing in
588: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 589: <li><a href="errata32.html#kerberos">March 24, 2003:
1.242 millert 590: A cryptographic weaknesses in the Kerberos v4 protocol can be
591: exploited on Kerberos v5 as well.</a>
1.294 david 592: <li><a href="errata32.html#kpr">March 19, 2003:
1.241 jufi 593: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 594: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.294 david 595: <li><a href="errata32.html#blinding">March 18, 2003:
1.239 miod 596: Various SSL and TLS operations in OpenSSL are vulnerable to
597: timing attacks.</a>
1.294 david 598: <li><a href="errata32.html#lprm">March 5, 2003:
1.238 millert 599: A buffer overflow in lprm(1) may allow an attacker to elevate
600: privileges to user daemon.</a>.
1.294 david 601: <li><a href="errata32.html#sendmail">March 3, 2003:
1.237 miod 602: A buffer overflow in the envelope comments processing in
603: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 604: <li><a href="errata32.html#httpd">February 25, 2003:
1.236 margarid 605: httpd(8) leaks file inode numbers via ETag header as well as
606: child PIDs in multipart MIME boundary generation. This could
607: lead, for example, to NFS exploitation because it uses inode
608: numbers as part of the file handle.</a>
1.294 david 609: <li><a href="errata32.html#ssl">February 22, 2003:
1.234 margarid 610: In ssl(8) an information leak can occur via timing by performing
611: a MAC computation even if incorrect block cipher padding has
612: been found, this is a countermeasure. Also, check for negative
613: sizes, in allocation routines.</a>
1.294 david 614: <li><a href="errata32.html#cvs">January 20, 2003:
1.232 millert 615: A double free exists in cvs(1) that could lead to privilege
616: escalation for cvs configurations where the cvs command is
1.233 margarid 617: run as a privileged user.</a>
1.294 david 618: <li><a href="errata32.html#named">November 14, 2002:
1.230 millert 619: A buffer overflow exists in named(8) that could lead to a
620: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 621: <li><a href="errata32.html#pool">November 6, 2002:
1.233 margarid 622: A logic error in the pool kernel memory allocator could cause
623: memory corruption in low-memory situations, causing the system
624: to crash.</a>
1.294 david 625: <li><a href="errata32.html#smrsh">November 6, 2002:
1.229 miod 626: An attacker can bypass smrsh(8)'s restrictions and execute
627: arbitrary commands with the privileges of his own account.</a>
1.294 david 628: <li><a href="errata32.html#pfbridge">November 6, 2002:
1.233 margarid 629: Network bridges running pf with scrubbing enabled could cause
630: mbuf corruption, causing the system to crash.</a>
1.294 david 631: <li><a href="errata32.html#kadmin">October 21, 2002:
1.228 miod 632: A buffer overflow can occur in the kadmind(8) daemon, leading
633: to possible remote crash or exploit.</a>
1.224 deraadt 634: </ul>
635:
1.227 miod 636: <p>
637: <li>
1.288 matthieu 638: <a name="31"></a>
1.203 deraadt 639:
1.294 david 640: <h3><font color="#e00000">OpenBSD 3.1 Security Advisories</font></h3>
1.203 deraadt 641: These are the OpenBSD 3.1 advisories -- all these problems are solved
1.294 david 642: in <a href="anoncvs.html">OpenBSD current</a>. The
643: <a href="stable.html">patch branch</a> for 3.1 is no longer being maintained,
1.258 beck 644: you should update your machine.
1.203 deraadt 645:
646: <p>
647: <ul>
1.294 david 648: <li><a href="errata31.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="errata31.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="errata31.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="errata31.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="errata31.html#lprm">March 4, 2003:
1.238 millert 661: A buffer overflow in lprm(1) may allow an attacker to gain
662: root privileges.</a>
1.294 david 663: <li><a href="errata31.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="errata31.html#ssl2">February 23, 2003:
1.235 miod 667: In ssl(8) an information leak can occur via timing by performing
668: a MAC computation even if incorrect block cipher padding has
669: been found, this is a countermeasure. Also, check for negative
670: sizes, in allocation routines.</a>
1.294 david 671: <li><a href="errata31.html#cvs">January 20, 2003:
1.232 millert 672: A double free exists in cvs(1) that could lead to privilege
673: escalation for cvs configurations where the cvs command is
1.294 david 674: run as a privileged user</a>.
675: <li><a href="errata31.html#named">November 14, 2002:
1.230 millert 676: A buffer overflow exists in named(8) that could lead to a
677: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 678: <li><a href="errata31.html#kernresource">November 6, 2002:
1.229 miod 679: Incorrect argument checking in the getitimer(2) system call
680: may allow an attacker to crash the system.</a>
1.294 david 681: <li><a href="errata31.html#smrsh">November 6, 2002:
1.229 miod 682: An attacker can bypass smrsh(8)'s restrictions and execute
683: arbitrary commands with the privileges of his own account.</a>
1.294 david 684: <li><a href="errata31.html#kadmin">October 21, 2002:
1.226 miod 685: A buffer overflow can occur in the kadmind(8) daemon, leading
686: to possible remote crash or exploit.</a>
1.294 david 687: <li><a href="errata31.html#kerntime">October 2, 2002:
1.222 jason 688: Incorrect argument checking in the setitimer(2) system call
689: may allow an attacker to write to kernel memory.</a>
1.294 david 690: <li><a href="errata31.html#scarg">August 11, 2002:
1.221 provos 691: An insufficient boundary check in the select system call
1.220 miod 692: allows an attacker to overwrite kernel memory and execute arbitrary code
693: in kernel context.</a>
1.294 david 694: <li><a href="errata31.html#ssl">July 30, 2002:
1.218 miod 695: Several remote buffer overflows can occur in the SSL2 server and SSL3
696: client of the ssl(8) library, as in the ASN.1 parser code in the
697: crypto(3) library, all of them being potentially remotely
698: exploitable.</a>
1.294 david 699: <li><a href="errata31.html#xdr">July 29, 2002:
1.218 miod 700: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
701: possible remote crash.</a>
1.294 david 702: <li><a href="errata31.html#pppd">July 29, 2002:
1.218 miod 703: A race condition exists in the pppd(8) daemon which may cause it to
704: alter the file permissions of an arbitrary file.</a>
1.294 david 705: <li><a href="errata31.html#isakmpd">July 5, 2002:
1.218 miod 706: Receiving IKE payloads out of sequence can cause isakmpd(8) to
707: crash.</a>
1.294 david 708: <li><a href="errata31.html#ktrace">June 27, 2002:
1.215 miod 709: The kernel would let any user ktrace set[ug]id processes.</a>
1.294 david 710: <li><a href="errata31.html#modssl">June 26, 2002:
1.213 miod 711: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 712: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.294 david 713: <li><a href="errata31.html#resolver">June 25, 2002:
1.212 millert 714: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 715: <li><a href="errata31.html#sshd">June 24, 2002:
1.216 deraadt 716: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 717: input validation error that can result in an integer overflow and
718: privilege escalation.</a>
1.294 david 719: <li><a href="errata31.html#httpd">June 19, 2002:
1.211 miod 720: A buffer overflow can occur during the interpretation of chunked
721: encoding in httpd(8), leading to possible remote crash.</a>
1.294 david 722: <li><a href="errata31.html#sshbsdauth">May 22, 2002:
1.209 markus 723: Under certain conditions, on systems using YP with netgroups
724: in the password database, it is possible that sshd(8) does
725: ACL checks for the requested user name but uses the password
726: database entry of a different user for authentication. This
727: means that denied users might authenticate successfully
728: while permitted users could be locked out.</a>
1.294 david 729: <li><a href="errata31.html#fdalloc2">May 8, 2002:
1.208 millert 730: A race condition exists that could defeat the kernel's
731: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 732: <li><a href="errata31.html#sudo">April 25, 2002:
1.205 millert 733: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 734: <li><a href="errata31.html#sshafs">April 22, 2002:
1.205 millert 735: A local user can gain super-user privileges due to a buffer
736: overflow in sshd(8) if AFS has been configured on the system
737: or if KerberosTgtPassing or AFSTokenPassing has been enabled
738: in the sshd_config file.</a>
1.203 deraadt 739: </ul>
740:
1.235 miod 741: <p>
1.203 deraadt 742: <li>
1.288 matthieu 743: <a name="30"></a>
1.187 deraadt 744:
1.294 david 745: <h3><font color="#e00000">OpenBSD 3.0 Security Advisories</font></h3>
1.187 deraadt 746: These are the OpenBSD 3.0 advisories -- all these problems are solved
1.294 david 747: in <a href="anoncvs.html">OpenBSD current</a>. The
748: <a href="stable.html">patch branch</a> for 3.0 is no longer being maintained,
1.258 beck 749: you should update your machine.
1.187 deraadt 750:
751: <p>
752: <ul>
1.294 david 753: <li><a href="errata30.html#named">November 14, 2002:
1.230 millert 754: A buffer overflow exists in named(8) that could lead to a
755: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 756: <li><a href="errata30.html#kernresource">November 6, 2002:
1.229 miod 757: Incorrect argument checking in the getitimer(2) system call
758: may allow an attacker to crash the system.</a>
1.294 david 759: <li><a href="errata30.html#smrsh">November 6, 2002:
1.229 miod 760: An attacker can bypass smrsh(8)'s restrictions and execute
761: arbitrary commands with the privileges of his own account.</a>
1.294 david 762: <li><a href="errata30.html#kadmin">October 21, 2002:
1.226 miod 763: A buffer overflow can occur in the kadmind(8) daemon, leading
764: to possible remote crash or exploit.</a>
1.294 david 765: <li><a href="errata30.html#kerntime">October 7, 2002:
1.223 miod 766: Incorrect argument checking in the setitimer(2) system call
767: may allow an attacker to write to kernel memory.</a>
1.294 david 768: <li><a href="errata30.html#scarg">August 11, 2002:
1.220 miod 769: An insufficient boundary check in the select and poll system calls
770: allows an attacker to overwrite kernel memory and execute arbitrary code
771: in kernel context.</a>
1.294 david 772: <li><a href="errata30.html#ssl">July 30, 2002:
1.218 miod 773: Several remote buffer overflows can occur in the SSL2 server and SSL3
774: client of the ssl(8) library, as in the ASN.1 parser code in the
775: crypto(3) library, all of them being potentially remotely
776: exploitable.</a>
1.294 david 777: <li><a href="errata30.html#xdr">July 29, 2002:
1.218 miod 778: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
779: possible remote crash.</a>
1.294 david 780: <li><a href="errata30.html#pppd">July 29, 2002:
1.218 miod 781: A race condition exists in the pppd(8) daemon which may cause it to
782: alter the file permissions of an arbitrary file.</a>
1.294 david 783: <li><a href="errata30.html#isakmpd2">July 5, 2002:
1.218 miod 784: Receiving IKE payloads out of sequence can cause isakmpd(8) to
785: crash.</a>
1.294 david 786: <li><a href="errata30.html#ktrace">June 27, 2002:
1.215 miod 787: The kernel would let any user ktrace set[ug]id processes.</a>
1.294 david 788: <li><a href="errata30.html#resolver">June 25, 2002:
1.212 millert 789: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 790: <li><a href="errata30.html#sshdauth">June 24, 2002:
1.216 deraadt 791: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 792: input validation error that can result in an integer overflow and
793: privilege escalation.</a>
1.294 david 794: <li><a href="errata30.html#modssl">June 24, 2002:
1.213 miod 795: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 796: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.294 david 797: <li><a href="errata30.html#httpd">June 19, 2002:
1.213 miod 798: A buffer overflow can occur during the interpretation of chunked
799: encoding in httpd(8), leading to possible remote crash.</a>
1.294 david 800: <li><a href="errata30.html#fdalloc2">May 8, 2002:
1.208 millert 801: A race condition exists that could defeat the kernel's
802: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 803: <li><a href="errata30.html#sudo2">April 25, 2002:
1.205 millert 804: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 805: <li><a href="errata30.html#sshafs">April 22, 2002:
1.205 millert 806: A local user can gain super-user privileges due to a buffer
807: overflow in sshd(8) if AFS has been configured on the system
808: or if KerberosTgtPassing or AFSTokenPassing has been enabled
809: in the sshd_config file.</a>
1.294 david 810: <li><a href="errata30.html#mail">April 11, 2002:
1.202 millert 811: The mail(1) was interpreting tilde escapes even when invoked
812: in non-interactive mode. As mail(1) is called as root from cron,
813: this can lead to a local root compromise.</a>
1.294 david 814: <li><a href="errata30.html#approval">March 19, 2002:
1.201 millert 815: Under certain conditions, on systems using YP with netgroups in
816: the password database, it is possible for the rexecd(8) and rshd(8)
817: daemons to execute a shell from a password database entry for a
818: different user. Similarly, atrun(8) may change to the wrong
819: home directory when running jobs.</a>
1.294 david 820: <li><a href="errata30.html#zlib">March 13, 2002:
1.200 millert 821: A potential double free() exists in the zlib library;
822: this is not exploitable on OpenBSD.
823: The kernel also contains a copy of zlib; it is not
824: currently known if the kernel zlib is exploitable.</a>
1.294 david 825: <li><a href="errata30.html#openssh">March 8, 2002:
1.198 millert 826: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 827: may allow a local user to gain super-user privileges.</a>
1.294 david 828: <li><a href="errata30.html#ptrace">January 21, 2002:
1.192 jason 829: A race condition between the ptrace(2) and execve(2) system calls
830: allows an attacker to modify the memory contents of suid/sgid
831: processes which could lead to compromise of the super-user account.</a>
1.294 david 832: <li><a href="errata30.html#sudo">January 17, 2002:
1.191 millert 833: There is a security hole in sudo(8) that can be exploited
834: when the Postfix sendmail replacement is installed that may
835: allow an attacker on the local host to gain root privileges.</a>
1.294 david 836: <li><a href="errata30.html#lpd">November 28, 2001:
1.189 millert 837: An attacker can trick a machine running the lpd daemon into
838: creating new files in the root directory from a machine with
839: remote line printer access.</a>
1.294 david 840: <li><a href="errata30.html#vi.recover">November 13, 2001:
1.188 millert 841: The vi.recover script can be abused in such a way as
842: to cause arbitrary zero-length files to be removed.</a>
1.294 david 843: <li><a href="errata30.html#pf">November 13, 2001:
1.190 mpech 844: pf(4) was incapable of dealing with certain ipv6 icmp packets,
845: resulting in a crash.</a>
1.294 david 846: <li><a href="errata30.html#sshd">November 12, 2001:
1.190 mpech 847: A security hole that may allow an attacker to partially authenticate
848: if -- and only if -- the administrator has enabled KerberosV.</a>
1.187 deraadt 849: </ul>
850:
851: <p>
852: <li>
1.288 matthieu 853: <a name="29"></a>
1.173 deraadt 854:
1.294 david 855: <h3><font color="#e00000">OpenBSD 2.9 Security Advisories</font></h3>
1.173 deraadt 856: These are the OpenBSD 2.9 advisories -- all these problems are solved
1.294 david 857: in <a href="anoncvs.html">OpenBSD current</a>. The
858: <a href="stable.html">patch branch</a>. for 2.9 is no longer being maintained,
1.258 beck 859: you should update your machine.
860:
1.173 deraadt 861:
862: <p>
863: <ul>
1.294 david 864: <li><a href="errata29.html#resolver">June 25, 2002:
1.212 millert 865: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 866: <li><a href="errata29.html#fdalloc2">May 8, 2002:
1.208 millert 867: A race condition exists that could defeat the kernel's
868: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 869: <li><a href="errata29.html#sudo2">April 25, 2002:
1.207 millert 870: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 871: <li><a href="errata29.html#sshafs">April 22, 2002:
1.206 millert 872: A local user can gain super-user privileges due to a buffer
873: overflow in sshd(8) if AFS has been configured on the system
874: or if KerberosTgtPassing or AFSTokenPassing has been enabled
875: in the sshd_config file.</a>
1.294 david 876: <li><a href="errata29.html#mail">April 11, 2002:
1.202 millert 877: The mail(1) was interpreting tilde escapes even when invoked
878: in non-interactive mode. As mail(1) is called as root from cron,
879: this can lead to a local root compromise.</a>
1.294 david 880: <li><a href="errata29.html#zlib">March 13, 2002:
1.200 millert 881: A potential double free() exists in the zlib library;
882: this is not exploitable on OpenBSD.
883: The kernel also contains a copy of zlib; it is not
884: currently known if the kernel zlib is exploitable.</a>
1.294 david 885: <li><a href="errata29.html#openssh">March 8, 2002:
1.198 millert 886: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 887: may allow a local user to gain super-user privileges.</a>
1.294 david 888: <li><a href="errata29.html#ptrace">January 21, 2002:
1.198 millert 889: A race condition between the ptrace(2) and execve(2) system calls
890: allows an attacker to modify the memory contents of suid/sgid
891: processes which could lead to compromise of the super-user account.</a>
1.294 david 892: <li><a href="errata29.html#sudo">January 17, 2002:
1.191 millert 893: There is a security hole in sudo(8) that can be exploited
894: when the Postfix sendmail replacement is installed that may
895: allow an attacker on the local host to gain root privileges.</a>
1.294 david 896: <li><a href="errata29.html#lpd2">November 28, 2001:
1.189 millert 897: An attacker can trick a machine running the lpd daemon into
898: creating new files in the root directory from a machine with
899: remote line printer access.</a>
1.294 david 900: <li><a href="errata29.html#vi.recover">November 13, 2001:
1.190 mpech 901: The vi.recover script can be abused in such a way as
902: to cause arbitrary zero-length files to be removed.</a>
1.294 david 903: <li><a href="errata29.html#uucp">September 11, 2001:
1.184 millert 904: A security hole exists in uuxqt(8) that may allow an
905: attacker to gain root privileges.</a>
1.294 david 906: <li><a href="errata29.html#lpd">August 29, 2001:
1.183 millert 907: A security hole exists in lpd(8) that may allow an
908: attacker to gain root privileges if lpd is running.</a>
1.294 david 909: <li><a href="errata29.html#sendmail2">August 21, 2001:
1.181 millert 910: A security hole exists in sendmail(8) that may allow an
911: attacker on the local host to gain root privileges.</a>
1.294 david 912: <li><a href="errata29.html#nfs">July 30, 2001:
1.180 jason 913: A kernel buffer overflow in the NFS code can be used to execute
914: arbitrary code by users with mount privileges (only root by
1.181 millert 915: default).</a>
1.294 david 916: <li><a href="errata29.html#kernexec">June 15, 2001:
1.178 aaron 917: A race condition in the kernel can lead to local root compromise.</a>
1.294 david 918: <li><a href="errata29.html#sshcookie">June 12, 2001:
1.177 markus 919: sshd(8) allows users to delete arbitrary files named "cookies"
920: if X11 forwarding is enabled. X11 forwarding is disabled
921: by default.</a>
1.294 david 922: <li><a href="errata29.html#fts">May 30, 2001:
1.176 millert 923: Programs using the fts routines can be tricked into changing
924: into the wrong directory.</a>
1.294 david 925: <li><a href="errata29.html#sendmail">May 29, 2001:
1.174 millert 926: Sendmail signal handlers contain unsafe code,
927: leading to numerous race conditions.</a>
1.173 deraadt 928: </ul>
929:
930: <p>
931: <li>
1.288 matthieu 932: <a name="28"></a>
1.152 deraadt 933:
1.294 david 934: <h3><font color="#e00000">OpenBSD 2.8 Security Advisories</font></h3>
1.152 deraadt 935: These are the OpenBSD 2.8 advisories -- all these problems are solved
1.294 david 936: in <a href="anoncvs.html">OpenBSD current</a>. The
937: <a href="stable.html">patch branch</a>. for 2.8 is no longer being maintained,
1.258 beck 938: you should update your machine.
939:
1.152 deraadt 940:
941: <p>
942: <ul>
1.294 david 943: <li><a href="errata28.html#uucp">September 11, 2001:
1.184 millert 944: A security hole exists in uuxqt(8) that may allow an
945: attacker to gain root privileges.</a>
1.294 david 946: <li><a href="errata28.html#lpd">August 29, 2001:
1.183 millert 947: A security hole exists in lpd(8) that may allow an
948: attacker to gain root privileges if lpd is running.</a>
1.294 david 949: <li><a href="errata28.html#sendmail2">August 21, 2001:
1.181 millert 950: A security hole exists in sendmail(8) that may allow an
951: attacker on the local host to gain root privileges.</a>
1.294 david 952: <li><a href="errata28.html#kernexec">June 15, 2001:
1.178 aaron 953: A race condition in the kernel can lead to local root compromise.</a>
1.294 david 954: <li><a href="errata28.html#fts">May 30, 2001:
1.176 millert 955: Programs using the fts routines can be tricked into changing
956: into the wrong directory.</a>
1.294 david 957: <li><a href="errata28.html#sendmail">May 29, 2001:
1.175 millert 958: Sendmail signal handlers contain unsafe code,
959: leading to numerous race conditions.</a>
1.294 david 960: <li><a href="errata28.html#ipf_frag">Apr 23, 2001:
1.231 mickey 961: IPF contains a serious bug with its handling of fragment caching.</a>
1.294 david 962: <li><a href="errata28.html#glob_limit">Apr 23, 2001:
1.172 ericj 963: ftpd(8) contains a potential DoS relating to glob(3).</a>
1.294 david 964: <li><a href="errata28.html#glob">Apr 10, 2001:
1.170 ericj 965: The glob(3) library call contains multiple buffer overflows.</a>
1.294 david 966: <li><a href="errata28.html#readline">Mar 18, 2001:
1.169 millert 967: The readline library creates history files with permissive modes based on the user's umask.</a>
1.294 david 968: <li><a href="errata28.html#ipsec_ah">Mar 2, 2001:
1.167 ericj 969: Insufficient checks in the IPSEC AH IPv4 option handling code can lead to a buffer overrun in the kernel.</a>
1.294 david 970: <li><a href="errata28.html#userldt">Mar 2, 2001:
1.168 horacio 971: The <b>USER_LDT</b> kernel option allows an attacker to gain access to privileged areas of kernel memory.</a>
1.294 david 972: <li><a href="errata28.html#sudo">Feb 22, 2001:
1.171 millert 973: a non-exploitable buffer overflow was fixed in sudo(8).</a>
1.294 david 974: <li><a href="errata28.html#named">Jan 29, 2001:
1.163 jason 975: merge named(8) with ISC BIND 4.9.8-REL, which fixes some buffer vulnerabilities.</a>
1.294 david 976: <li><a href="errata28.html#rnd">Jan 22, 2001:
1.162 jason 977: rnd(4) did not use all of its input when written to.</a>
1.294 david 978: <li><a href="errata28.html#xlock">Dec 22, 2000:
1.159 ericj 979: xlock(1)'s authentication was re-done to authenticate via a named pipe. (patch and new xlock binaries included).</a>
1.294 david 980: <li><a href="errata28.html#procfs">Dec 18, 2000:
1.157 ericj 981: Procfs contains numerous overflows. Procfs is not used by default in OpenBSD. (patch included).</a>
1.294 david 982: <li><a href="errata28.html#kerberos2">Dec 10, 2000:
1.156 deraadt 983: Another problem exists in KerberosIV libraries (patch included).</a>
1.294 david 984: <li><a href="errata28.html#kerberos">Dec 7, 2000:
1.155 deraadt 985: A set of problems in KerberosIV exist (patch included).</a>
1.294 david 986: <li><a href="errata28.html#ftpd">Dec 4, 2000:
1.154 millert 987: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.152 deraadt 988: </ul>
989:
990: <p>
991: <li>
1.288 matthieu 992: <a name="27"></a>
1.124 deraadt 993:
1.294 david 994: <h3><font color="#e00000">OpenBSD 2.7 Security Advisories</font></h3>
1.124 deraadt 995: These are the OpenBSD 2.7 advisories -- all these problems are solved
1.294 david 996: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.124 deraadt 997: OpenBSD 2.6 advisories listed below are fixed in OpenBSD 2.7.
998:
999: <p>
1000: <ul>
1.294 david 1001: <li><a href="errata27.html#readline">Mar 18, 2001:
1.169 millert 1002: The readline library creates history files with permissive modes based on the user's umask.</a>
1.294 david 1003: <li><a href="errata27.html#sudo">Feb 22, 2001:
1.169 millert 1004: a buffer overflow was fixed in sudo(8).</a>
1.294 david 1005: <li><a href="errata27.html#ftpd">Dec 4, 2000:
1.154 millert 1006: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.294 david 1007: <li><a href="errata27.html#sshforwarding">Nov 10, 2000:
1.152 deraadt 1008: Hostile servers can force OpenSSH clients to do agent or X11 forwarding.
1009: (patch included)</a>
1.294 david 1010: <li><a href="errata27.html#xtrans">Oct 26, 2000:
1.151 matthieu 1011: X11 libraries have 2 potential overflows in xtrans code.
1012: (patch included)</a>
1.294 david 1013: <li><a href="errata27.html#httpd">Oct 18, 2000:
1.150 beck 1014: Apache mod_rewrite and mod_vhost_alias modules could expose files
1015: on the server in certain configurations if used.
1016: (patch included)</a>
1.294 david 1017: <li><a href="errata27.html#telnetd">Oct 10, 2000:
1.149 millert 1018: The telnet daemon does not strip out the TERMINFO, TERMINFO_DIRS,
1019: TERMPATH and TERMCAP environment variables as it should.
1020: (patch included)</a>
1.294 david 1021: <li><a href="errata27.html#format_strings">Oct 6, 2000:
1.148 millert 1022: There are printf-style format string bugs in several privileged
1023: programs. (patch included)</a>
1.294 david 1024: <li><a href="errata27.html#curses">Oct 6, 2000:
1.147 millert 1025: libcurses honored terminal descriptions in the $HOME/.terminfo
1026: directory as well as in the TERMCAP environment variable for
1027: setuid and setgid applications.
1.146 deraadt 1028: (patch included)</a>
1.294 david 1029: <li><a href="errata27.html#talkd">Oct 6, 2000:
1.146 deraadt 1030: A format string vulnerability exists in talkd(8).
1031: (patch included)</a>
1.294 david 1032: <li><a href="errata27.html#pw_error">Oct 3, 2000:
1.145 aaron 1033: A format string vulnerability exists in the pw_error() function of the
1034: libutil library, yielding localhost root through chpass(1).
1035: (patch included)</a>
1.294 david 1036: <li><a href="errata27.html#ipsec">Sep 18, 2000:
1.144 jason 1037: Bad ESP/AH packets could cause a crash under certain conditions.
1038: (patch included)</a>
1.294 david 1039: <li><a href="errata27.html#xlock">Aug 16, 2000:
1.141 deraadt 1040: A format string vulnerability (localhost root) exists in xlock(1).
1041: (patch included)</a>
1.294 david 1042: <li><a href="errata27.html#X11_libs">July 14, 2000:
1.139 deraadt 1043: Various bugs found in X11 libraries have various side effects, almost
1044: completely denial of service in OpenBSD.
1045: (patch included)</a>
1.294 david 1046: <li><a href="errata27.html#ftpd">July 5, 2000:
1.136 deraadt 1047: Just like pretty much all the other unix ftp daemons
1048: on the planet, ftpd had a remote root hole in it.
1049: Luckily, ftpd was not enabled by default.
1.137 deraadt 1050: The problem exists if anonymous ftp is enabled.
1.136 deraadt 1051: (patch included)</a>
1.294 david 1052: <li><a href="errata27.html#mopd">July 5, 2000:
1.136 deraadt 1053: Mopd, very rarely used, contained some buffer overflows.
1054: (patch included)</a>
1.294 david 1055: <li><a href="errata27.html#libedit">June 28, 2000:
1.135 deraadt 1056: libedit would check for a <b>.editrc</b> file in the current
1057: directory. Not known to be a real security issue, but a patch
1058: is available anyways.
1059: (patch included)</a>
1.294 david 1060: <li><a href="errata27.html#dhclient">June 24, 2000:
1.134 deraadt 1061: A serious bug in dhclient(8) could allow strings from a
1062: malicious dhcp server to be executed in the shell as root.
1063: (patch included)</a>
1.294 david 1064: <li><a href="errata27.html#isakmpd">June 9, 2000:
1.133 deraadt 1065: A serious bug in isakmpd(8) policy handling wherein
1066: policy verification could be completely bypassed in isakmpd.
1067: (patch included)</a>
1.294 david 1068: <li><a href="errata27.html#uselogin">June 6, 2000:
1.132 deraadt 1069: The non-default flag UseLogin in <b>/etc/sshd_config</b> is broken,
1070: should not be used, and results in security problems on
1071: other operating systems.</a>
1.294 david 1072: <li><a href="errata27.html#bridge">May 26, 2000:
1.129 deraadt 1073: The bridge(4) <i>learning</i> flag may be bypassed.
1.128 deraadt 1074: (patch included)</a>
1.294 david 1075: <li><a href="errata27.html#ipf">May 25, 2000:
1.127 kjell 1076: Improper use of ipf <i>keep-state</i> rules can result
1077: in firewall rules being bypassed. (patch included)</a>
1078:
1.124 deraadt 1079: </ul>
1080:
1081: <p>
1082: <li>
1.288 matthieu 1083: <a name="26"></a>
1.119 deraadt 1084:
1.294 david 1085: <h3><font color="#e00000">OpenBSD 2.6 Security Advisories</font></h3>
1.119 deraadt 1086: These are the OpenBSD 2.6 advisories -- all these problems are solved
1.294 david 1087: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.119 deraadt 1088: OpenBSD 2.5 advisories listed below are fixed in OpenBSD 2.6.
1089:
1090: <p>
1091: <ul>
1.294 david 1092: <li><a href="errata26.html#semconfig">May 26, 2000:
1.130 deraadt 1093: SYSV semaphore support contained an undocumented system call
1.131 deraadt 1094: which could wedge semaphore-using processes from exiting. (patch included)</a>
1.294 david 1095: <li><a href="errata26.html#ipf">May 25, 2000:
1.127 kjell 1096: Improper use of ipf <i>keep-state</i> rules can result
1097: in firewall rules being bypassed. (patch included)</a>
1.294 david 1098: <li><a href="errata26.html#xlockmore">May 25, 2000:
1.125 deraadt 1099: xlockmore has a bug which a localhost attacker can use to gain
1100: access to the encrypted root password hash (which is normally
1.245 miod 1101: encoded using blowfish</a> (see
1.294 david 1102: <a href="http://www.openbsd.org/cgi-bin/man.cgi?query=crypt&sektion=3">
1.125 deraadt 1103: crypt(3)</a>)
1.245 miod 1104: (patch included).
1.294 david 1105: <li><a href="errata26.html#procfs">Jan 20, 2000:
1.123 deraadt 1106: Systems running with procfs enabled and mounted are
1107: vulnerable to a very tricky exploit. procfs is not
1108: mounted by default.
1109: (patch included).</a>
1.294 david 1110: <li><a href="errata26.html#sendmail">Dec 4, 1999:
1.296 david 1111: Sendmail permitted any user to cause an aliases file wrap,
1.190 mpech 1112: thus exposing the system to a race where the aliases file
1113: did not exist.
1.119 deraadt 1114: (patch included).</a>
1.294 david 1115: <li><a href="errata26.html#poll">Dec 4, 1999:
1.190 mpech 1116: Various bugs in poll(2) may cause a kernel crash.</a>
1.294 david 1117: <li><a href="errata26.html#sslUSA">Dec 2, 1999:
1.120 deraadt 1118: A buffer overflow in the RSAREF code included in the
1119: USA version of libssl, is possibly exploitable in
1120: httpd, ssh, or isakmpd, if SSL/RSA features are enabled.
1.124 deraadt 1121: (patch included).<br></a>
1122: <strong>Update:</strong> Turns out that this was not exploitable
1123: in any of the software included in OpenBSD 2.6.
1.294 david 1124: <li><a href="errata26.html#ifmedia">Nov 9, 1999:
1.190 mpech 1125: Any user could change interface media configurations, resulting in
1126: a localhost denial of service attack.
1.121 deraadt 1127: (patch included).</a>
1.119 deraadt 1128: </ul>
1129:
1130: <p>
1131: <li>
1.288 matthieu 1132: <a name="25"></a>
1.106 deraadt 1133:
1.294 david 1134: <h3><font color="#e00000">OpenBSD 2.5 Security Advisories</font></h3>
1.93 deraadt 1135: These are the OpenBSD 2.5 advisories -- all these problems are solved
1.294 david 1136: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.93 deraadt 1137: OpenBSD 2.4 advisories listed below are fixed in OpenBSD 2.5.
1138:
1.96 deraadt 1139: <p>
1.104 deraadt 1140: <ul>
1.294 david 1141: <li><a href="errata25.html#cron">Aug 30, 1999:
1.103 deraadt 1142: In cron(8), make sure argv[] is NULL terminated in the
1143: fake popen() and run sendmail as the user, not as root.
1144: (patch included).</a>
1.294 david 1145: <li><a href="errata25.html#miscfs">Aug 12, 1999: The procfs and fdescfs
1.101 deraadt 1146: filesystems had an overrun in their handling of uio_offset
1147: in their readdir() routines. (These filesystems are not
1148: enabled by default). (patch included).</a>
1.294 david 1149: <li><a href="errata25.html#profil">Aug 9, 1999: Stop profiling (see profil(2))
1.100 deraadt 1150: when we execve() a new process. (patch included).</a>
1.294 david 1151: <li><a href="errata25.html#ipsec_in_use">Aug 6, 1999: Packets that should have
1.98 deraadt 1152: been handled by IPsec may be transmitted as cleartext.
1153: PF_KEY SA expirations may leak kernel resources.
1154: (patch included).</a>
1.294 david 1155: <li><a href="errata25.html#rc">Aug 5, 1999: In /etc/rc, use mktemp(1) for
1.97 deraadt 1156: motd re-writing and change the find(1) to use -execdir
1157: (patch included).</a>
1.294 david 1158: <li><a href="errata25.html#chflags">Jul 30, 1999: Do not permit regular
1.95 deraadt 1159: users to chflags(2) or fchflags(2) on character or block devices
1160: which they may currently be the owner of (patch included).</a>
1.294 david 1161: <li><a href="errata25.html#nroff">Jul 27, 1999: Cause groff(1) to be invoked
1.95 deraadt 1162: with the -S flag, when called by nroff(1) (patch included).</a>
1.93 deraadt 1163: </ul>
1164:
1.106 deraadt 1165: <p>
1166: <li>
1.288 matthieu 1167: <a name="24"></a>
1.235 miod 1168:
1.294 david 1169: <h3><font color="#e00000">OpenBSD 2.4 Security Advisories</font></h3>
1.75 deraadt 1170: These are the OpenBSD 2.4 advisories -- all these problems are solved
1.294 david 1171: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.75 deraadt 1172: OpenBSD 2.3 advisories listed below are fixed in OpenBSD 2.4.
1173:
1.96 deraadt 1174: <p>
1.75 deraadt 1175: <ul>
1.294 david 1176: <li><a href="errata24.html#poll">Mar 22, 1999: The nfds argument for poll(2) needs
1.91 deraadt 1177: to be constrained, to avoid kvm starvation (patch included).</a>
1.294 david 1178: <li><a href="errata24.html#tss">Mar 21, 1999: A change in TSS handling stops
1.91 deraadt 1179: another kernel crash case caused by the <strong>crashme</strong>
1180: program (patch included).</a>
1.294 david 1181: <li><a href="errata24.html#nlink">Feb 25, 1999: An unbounded increment on the
1.90 deraadt 1182: nlink value in FFS and EXT2FS filesystems can cause a system crash.
1.89 deraadt 1183: (patch included).</a>
1.294 david 1184: <li><a href="errata24.html#ping">Feb 23, 1999: Yet another buffer overflow
1.88 deraadt 1185: existed in ping(8). (patch included).</a>
1.294 david 1186: <li><a href="errata24.html#ipqrace">Feb 19, 1999: ipintr() had a race in use of
1.87 deraadt 1187: the ipq, which could permit an attacker to cause a crash.
1188: (patch included).</a>
1.294 david 1189: <li><a href="errata24.html#accept">Feb 17, 1999: A race condition in the
1.86 deraadt 1190: kernel between accept(2) and select(2) could permit an attacker
1191: to hang sockets from remote.
1192: (patch included).</a>
1.294 david 1193: <li><a href="errata24.html#maxqueue">Feb 17, 1999: IP fragment assembly can
1.85 deraadt 1194: bog the machine excessively and cause problems.
1195: (patch included).</a>
1.294 david 1196: <li><a href="errata24.html#trctrap">Feb 12, 1999: i386 T_TRCTRAP handling and
1.84 deraadt 1197: DDB interacted to possibly cause a crash.
1198: (patch included).</a>
1.294 david 1199: <li><a href="errata24.html#rst">Feb 11, 1999: TCP/IP RST handling was sloppy.
1.83 deraadt 1200: (patch included).</a>
1.294 david 1201: <li><a href="errata24.html#bootpd">Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 1202: problem in bootpd(8). (patch included).</a>
1.294 david 1203: <li><a href="errata24.html#termcap">Nov 19, 1998: There is a possibly locally
1.82 deraadt 1204: exploitable problem relating to environment variables in termcap
1205: and curses. (patch included).</a>
1.294 david 1206: <li><a href="errata24.html#tcpfix">Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 1207: bug in the TCP decoding kernel. (patch included).</a>
1.75 deraadt 1208: </ul>
1209:
1.106 deraadt 1210: <p>
1211: <li>
1.288 matthieu 1212: <a name="23"></a>
1.235 miod 1213:
1.294 david 1214: <h3><font color="#e00000">OpenBSD 2.3 Security Advisories</font></h3>
1.73 deraadt 1215: These are the OpenBSD 2.3 advisories -- all these problems are solved
1.294 david 1216: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.73 deraadt 1217: OpenBSD 2.2 advisories listed below are fixed in OpenBSD 2.3.
1.53 matthieu 1218:
1.96 deraadt 1219: <p>
1.53 matthieu 1220: <ul>
1.294 david 1221: <li><a href="errata23.html#bootpd">Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 1222: problem in bootpd(8). (patch included).</a>
1.294 david 1223: <li><a href="errata23.html#tcpfix">Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 1224: bug in the TCP decoding kernel. (patch included).</a>
1.294 david 1225: <li><a href="errata23.html#resolver">August 31, 1998: A benign looking resolver
1.190 mpech 1226: buffer overflow bug was re-introduced accidentally (patches included).</a>
1.294 david 1227: <li><a href="errata23.html#chpass">Aug 2, 1998:
1.190 mpech 1228: chpass(1) has a file descriptor leak which allows an
1229: attacker to modify /etc/master.passwd.</a>
1.294 david 1230: <li><a href="errata23.html#inetd">July 15, 1998: Inetd had a file descriptor leak.</a>
1231: <li><a href="errata23.html#fdalloc">Jul 2, 1998: setuid and setgid processes
1.72 deraadt 1232: should not be executed with fd slots 0, 1, or 2 free.
1233: (patch included).</a>
1.294 david 1234: <li><a href="errata23.html#xlib">June 6, 1998: Further problems with the X
1.71 deraadt 1235: libraries (patches included).</a>
1.294 david 1236: <li><a href="errata23.html#kill">May 17, 1998: kill(2) of setuid/setgid target
1.66 deraadt 1237: processes too permissive (4th revision patch included).</a>
1.294 david 1238: <li><a href="errata23.html#immutable">May 11, 1998: mmap() permits partial bypassing
1.60 deraadt 1239: of immutable and append-only file flags. (patch included).</a>
1.294 david 1240: <li><a href="errata23.html#ipsec">May 5, 1998: Incorrect handling of IPSEC packets
1.190 mpech 1241: if IPSEC is enabled (patch included).</a>
1.294 david 1242: <li><a href="errata23.html#xterm-xaw">May 1, 1998: Buffer overflow in xterm and Xaw
1.58 deraadt 1243: (CERT advisory VB-98.04) (patch included).</a>
1.53 matthieu 1244: </ul>
1.9 deraadt 1245:
1.106 deraadt 1246: <p>
1247: <li>
1.288 matthieu 1248: <a name="22"></a>
1.235 miod 1249:
1.294 david 1250: <h3><font color="#e00000">OpenBSD 2.2 Security Advisories</font></h3>
1.45 deraadt 1251: These are the OpenBSD 2.2 advisories. All these problems are solved
1.294 david 1252: in <a href="23.html">OpenBSD 2.3</a>. Some of these problems
1.45 deraadt 1253: still exist in other operating systems. (The supplied patches are for
1254: OpenBSD 2.2; they may or may not work on OpenBSD 2.1).
1.9 deraadt 1255:
1.96 deraadt 1256: <p>
1.9 deraadt 1257: <ul>
1.294 david 1258: <li><a href="errata22.html#ipsec">May 5, 1998: Incorrect handling of IPSEC
1.72 deraadt 1259: packets if IPSEC is enabled (patch included).</a>
1.294 david 1260: <li><a href="errata22.html#xterm-xaw">May 1, 1998: Buffer overflow in xterm
1.72 deraadt 1261: and Xaw (CERT advisory VB-98.04) (patch included).</a>
1.294 david 1262: <li><a href="errata22.html#uucpd">Apr 22, 1998: Buffer overflow in uucpd
1.72 deraadt 1263: (patch included).</a>
1.294 david 1264: <li><a href="errata22.html#rmjob">Apr 22, 1998: Buffer mismanagement in lprm
1.72 deraadt 1265: (patch included).</a>
1.294 david 1266: <li><a href="errata22.html#ping">Mar 31, 1998: Overflow in ping -R (patch included).</a>
1267: <li><a href="errata22.html#named">Mar 30, 1998: Overflow in named fake-iquery
1.59 deraadt 1268: (patch included).</a>
1.294 david 1269: <li><a href="errata22.html#mountd">Mar 2, 1998: Accidental NFS filesystem
1.72 deraadt 1270: export (patch included).</a>
1.112 philen 1271: <li><a href="advisories/mmap.txt">Feb 26, 1998: Read-write mmap() flaw.</a>
1.294 david 1272: Revision 3 of the patch is available <a href="errata22.html#mmap">here</a>
1.112 philen 1273: <li><a href="advisories/sourceroute.txt">Feb 19, 1998: Sourcerouted Packet
1.59 deraadt 1274: Acceptance.</a>
1.294 david 1275: A patch is available <a href="errata22.html#sourceroute">here</a>.
1276: <li><a href="errata22.html#ruserok">Feb 13, 1998: Setuid coredump & Ruserok()
1.72 deraadt 1277: flaw (patch included).</a>
1.294 david 1278: <li><a href="errata22.html#ldso">Feb 9, 1998: MIPS ld.so flaw (patch included).</a>
1.1 deraadt 1279: </ul>
1280:
1.106 deraadt 1281: <p>
1282: <li>
1.288 matthieu 1283: <a name="21"></a>
1.235 miod 1284:
1.294 david 1285: <h3><font color="#e00000">OpenBSD 2.1 Security Advisories</font></h3>
1.52 deraadt 1286: These are the OpenBSD 2.1 advisories. All these problems are solved
1.294 david 1287: in <a href="22.html">OpenBSD 2.2</a>. Some of these problems still
1.52 deraadt 1288: exist in other operating systems. (If you are running OpenBSD 2.1, we
1289: would strongly recommend an upgrade to the newest release, as this
1290: patch list only attempts at fixing the most important security
1291: problems. In particular, OpenBSD 2.2 fixes numerous localhost
1292: security problems. Many of those problems were solved in ways which
1293: make it hard for us to provide patches).
1294:
1.96 deraadt 1295: <p>
1.52 deraadt 1296: <ul>
1.112 philen 1297: <li><a href="advisories/signals.txt">Sep 15, 1997: Deviant Signals (patch included)</a>
1298: <li><a href="advisories/rfork.txt">Aug 2, 1997: Rfork() system call flaw
1.59 deraadt 1299: (patch included)</a>
1.112 philen 1300: <li><a href="advisories/procfs.txt">Jun 24, 1997: Procfs flaws (patch included)</a>
1.52 deraadt 1301: </ul>
1.51 deraadt 1302:
1.106 deraadt 1303: <p>
1304: <li>
1.288 matthieu 1305: <a name="20"></a>
1.235 miod 1306:
1.294 david 1307: <h3><font color="#e00000">OpenBSD 2.0 Security Advisories</font></h3>
1.99 deraadt 1308: These are the OpenBSD 2.0 advisories. All these problems are solved
1.294 david 1309: in <a href="21.html">OpenBSD 2.1</a>. Some of these problems still
1.99 deraadt 1310: exist in other operating systems. (If you are running OpenBSD 2.0, we
1311: commend you for being there back in the old days!, but you're really
1312: missing out if you don't install a new version!)
1313:
1314: <p>
1315: <ul>
1.112 philen 1316: <li><a href="advisories/res_random.txt">April 22, 1997: Predictable IDs in the
1.99 deraadt 1317: resolver (patch included)</a>
1318: <li>Many others... if people can hunt them down, please let me know
1319: and we'll put them up here.
1320: </ul>
1.51 deraadt 1321: <p>
1.106 deraadt 1322:
1.288 matthieu 1323: <a name="watching"></a>
1.294 david 1324: <li><h3><font color="#e00000">Watching our Changes</font></h3><p>
1.106 deraadt 1325:
1.21 deraadt 1326: Since we take a proactive stance with security, we are continually
1327: finding and fixing new security problems. Not all of these problems
1.80 espie 1328: get widely reported because (as stated earlier) many of them are not
1.45 deraadt 1329: confirmed to be exploitable; many simple bugs we fix do turn out to
1330: have security consequences we could not predict. We do not have the
1331: time resources to make these changes available in the above format.<p>
1.21 deraadt 1332:
1333: Thus there are usually minor security fixes in the current source code
1334: beyond the previous major OpenBSD release. We make a limited
1.45 deraadt 1335: guarantee that these problems are of minimal impact and unproven
1.44 ian 1336: exploitability. If we discover that a problem definitely matters for
1.45 deraadt 1337: security, patches will show up here <strong>VERY</strong> quickly.<p>
1.21 deraadt 1338:
1.45 deraadt 1339: People who are really concerned with security can do a number of
1340: things:<p>
1.21 deraadt 1341:
1342: <ul>
1343: <li>If you understand security issues, watch our
1.294 david 1344: <a href="mail.html">source-changes mailing list</a> and keep an
1.23 deraadt 1345: eye out for things which appear security related. Since
1.21 deraadt 1346: exploitability is not proven for many of the fixes we make,
1347: do not expect the relevant commit message to say "SECURITY FIX!".
1348: If a problem is proven and serious, a patch will be available
1349: here very shortly after.
1.161 horacio 1350: <li>In addition to source changes, you can watch our <a href="mail.html">
1.160 ericj 1351: security-announce mailing list</a> which will notify you for every
1.186 ian 1352: security related item that the OpenBSD team deems as a possible threat,
1.160 ericj 1353: and instruct you on how to patch the problem.
1.21 deraadt 1354: <li>Track our current source code tree, and teach yourself how to do a
1.29 deraadt 1355: complete system build from time to time (read /usr/src/Makefile
1356: carefully). Users can make the assumption that the current
1357: source tree always has stronger security than the previous release.
1.45 deraadt 1358: However, building your own system from source code is not trivial;
1.265 miod 1359: it is nearly 600MB of source code, and problems do occur as we
1.45 deraadt 1360: transition between major releases.
1.115 ericj 1361: <li>Install a binary snapshot for your
1.80 espie 1362: architecture, which are made available fairly often. For
1.29 deraadt 1363: instance, an i386 snapshot is typically made available weekly.
1.21 deraadt 1364: </ul>
1365:
1.9 deraadt 1366: <p>
1.288 matthieu 1367: <a name="reporting"></a>
1.294 david 1368: <li><h3><font color="#e00000">Reporting problems</font></h3><p>
1.3 deraadt 1369:
1.5 deraadt 1370: <p> If you find a new security problem, you can mail it to
1.294 david 1371: <a href="mailto:deraadt@openbsd.org">deraadt@openbsd.org</a>.
1.7 deraadt 1372: <br>
1.5 deraadt 1373: If you wish to PGP encode it (but please only do so if privacy is very
1.112 philen 1374: urgent, since it is inconvenient) use this <a href="advisories/pgpkey.txt">pgp key</a>.
1.5 deraadt 1375:
1.107 deraadt 1376: <p>
1.288 matthieu 1377: <a name="papers"></a>
1.294 david 1378: <li><h3><font color="#e00000">Further Reading</font></h3><p>
1.107 deraadt 1379:
1380: A number of papers have been written by OpenBSD team members, about security
1381: related changes they have done in OpenBSD. The postscript versions of these
1.108 deraadt 1382: documents are available as follows.<p>
1.107 deraadt 1383:
1384: <ul>
1.113 deraadt 1385: <li>A Future-Adaptable Password Scheme.<br>
1.294 david 1386: <a href="events.html#usenix99">Usenix 1999</a>,
1387: by <a href="mailto:provos@openbsd.org">Niels Provos</a>,
1388: <a href="mailto:dm@openbsd.org">David Mazieres</a>.<br>
1389: <a href="papers/bcrypt-paper.ps">paper</a> and
1390: <a href="papers/bcrypt-slides.ps">slides</a>.
1.113 deraadt 1391: <p>
1392: <li>Cryptography in OpenBSD: An Overview.<br>
1.294 david 1393: <a href="events.html#usenix99">Usenix 1999</a>,
1394: by <a href="mailto:deraadt@openbsd.org">Theo de Raadt</a>,
1395: <a href="mailto:niklas@openbsd.org">Niklas Hallqvist</a>,
1396: <a href="mailto:art@openbsd.org">Artur Grabowski</a>,
1397: <a href="mailto:angelos@openbsd.org">Angelos D. Keromytis</a>,
1398: <a href="mailto:provos@openbsd.org">Niels Provos</a>.<br>
1399: <a href="papers/crypt-paper.ps">paper</a> and
1400: <a href="papers/crypt-slides.ps">slides</a>.
1.113 deraadt 1401: <p>
1402: <li>strlcpy and strlcat -- consistent, safe, string copy and concatenation.<br>
1.294 david 1403: <a href="events.html#usenix99">Usenix 1999</a>,
1404: by <a href="mailto:millert@openbsd.org">Todd C. Miller</a>,
1405: <a href="mailto:deraadt@openbsd.org">Theo de Raadt</a>.<br>
1406: <a href="papers/strlcpy-paper.ps">paper</a> and
1407: <a href="papers/strlcpy-slides.ps">slides</a>.
1.113 deraadt 1408: <p>
1.118 deraadt 1409: <li>Dealing with Public Ethernet Jacks-Switches, Gateways, and Authentication.<br>
1.294 david 1410: <a href="events.html#lisa99">LISA 1999</a>,
1411: by <a href="mailto:beck@openbsd.org">Bob Beck</a>.<br>
1412: <a href="papers/authgw-paper.ps">paper</a> and
1413: <a href="papers/authgw-slides.ps">slides</a>.
1.118 deraadt 1414: <p>
1.153 jufi 1415: <li>Encrypting Virtual Memory<br>
1.294 david 1416: <a href="events.html#sec2000">Usenix Security 2000</a>,
1417: <a href="mailto:provos@openbsd.org">Niels Provos</a>.<br>
1418: <a href="papers/swapencrypt.ps">paper</a> and
1419: <a href="papers/swapencrypt-slides.ps">slides</a>.
1.142 deraadt 1420: <p>
1.107 deraadt 1421: </ul>
1.294 david 1422: </ul>
1.106 deraadt 1423:
1.2 deraadt 1424: <hr>
1.294 david 1425: <a href="index.html"><img height=24 width=24 src="back.gif" border=0 alt="OpenBSD"></a>
1426: <a href="mailto:www@openbsd.org">www@openbsd.org</a>
1.24 deraadt 1427: <br>
1.321 ! brad 1428: <small>$OpenBSD: security.html,v 1.320 2006/02/12 10:25:39 brad Exp $</small>
1.1 deraadt 1429:
1.24 deraadt 1430: </body>
1431: </html>
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