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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>
1.328 ! brad 235: <li><a href="errata.html#bind">Sep 8, 2006:
! 236: Two Denial of Service issues have been found with BIND.</a>
1.327 brad 237: <li><a href="errata.html#sppp">Sep 2, 2006:
238: Due to the failure to correctly validate LCP configuration option
239: lengths, it is possible for an attacker to send LCP packets via an
240: sppp(4) connection causing the kernel to panic.</a>
1.326 brad 241: <li><a href="errata.html#isakmpd">Aug 25, 2006:
242: A problem in isakmpd(8) caused IPsec to run partly without replay
243: protection.</a>
244: <li><a href="errata.html#sem">Aug 25, 2006:
245: It is possible to cause the kernel to panic when more than the default
246: number of sempahores have been allocated.</a>
247: <li><a href="errata.html#dhcpd">Aug 25, 2006:
248: Due to an off-by-one error in dhcpd(8) it is possible to cause dhcpd(8)
249: to exit by sending a DHCPDISCOVER packet with a 32-byte client identifier
250: option.</a>
251: <li><a href="errata.html#sendmail3">Aug 25, 2006:
252: A potential denial of service problem has been found in sendmail.</a>
1.325 brad 253: <li><a href="errata.html#httpd">Jul 30, 2006:
254: httpd(8)'s mod_rewrite has a potentially exploitable off-by-one buffer
255: overflow.</a>
1.324 brad 256: <li><a href="errata.html#sendmail2">Jun 15, 2006:
257: A potential denial of service problem has been found in sendmail.</a>
1.322 brad 258: <li><a href="errata.html#xorg">May 2, 2006:
259: A buffer overflow exists in the Render extension of the X server.</a>
1.321 brad 260: <li><a href="errata.html#sendmail">Mar 25, 2006:
261: A race condition has been reported to exist in the handling by sendmail
262: of asynchronous signals.</a>
263: </ul>
264:
265: <li>
1.318 deraadt 266: <a name="38"></a>
267:
268: <h3><font color="#e00000">OpenBSD 3.8 Security Advisories</font></h3>
269: These are the OpenBSD 3.8 advisories -- all these problems are solved
270: in <a href=anoncvs.html>OpenBSD current</a> and the
271: <a href=stable.html>patch branch</a>.
272:
273: <p>
274: <ul>
1.328 ! brad 275: <li><a href="errata38.html#bind">Sep 8, 2006:
! 276: Two Denial of Service issues have been found with BIND.</a>
1.327 brad 277: <li><a href="errata38.html#sppp">Sep 2, 2006:
278: Due to the failure to correctly validate LCP configuration option
279: lengths, it is possible for an attacker to send LCP packets via an
280: sppp(4) connection causing the kernel to panic.</a>
1.326 brad 281: <li><a href="errata38.html#isakmpd">Aug 25, 2006:
282: A problem in isakmpd(8) caused IPsec to run partly without replay
283: protection.</a>
284: <li><a href="errata38.html#sem">Aug 25, 2006:
285: It is possible to cause the kernel to panic when more than the default
286: number of sempahores have been allocated.</a>
287: <li><a href="errata38.html#dhcpd">Aug 25, 2006:
288: Due to an off-by-one error in dhcpd(8) it is possible to cause dhcpd(8)
289: to exit by sending a DHCPDISCOVER packet with a 32-byte client identifier
290: option.</a>
291: <li><a href="errata38.html#sendmail3">Aug 25, 2006:
292: A potential denial of service problem has been found in sendmail.</a>
1.325 brad 293: <li><a href="errata38.html#httpd">Jul 30, 2006:
294: httpd(8)'s mod_rewrite has a potentially exploitable off-by-one buffer
295: overflow.</a>
1.324 brad 296: <li><a href="errata38.html#sendmail2">Jun 15, 2006:
297: A potential denial of service problem has been found in sendmail.</a>
1.322 brad 298: <li><a href="errata38.html#xorg">May 2, 2006:
299: A buffer overflow exists in the Render extension of the X server.</a>
1.321 brad 300: <li><a href="errata38.html#sendmail">Mar 25, 2006:
301: A race condition has been reported to exist in the handling by sendmail
302: of asynchronous signals.</a>
303: <li><a href="errata38.html#ssh">Feb 12, 2006:
1.320 brad 304: Josh Bressers has reported a weakness in OpenSSH caused due to the
305: insecure use of the system(3) function in scp(1) when performing copy
306: operations using filenames that are supplied by the user from the
307: command line.</a>
1.321 brad 308: <li><a href="errata38.html#fd">Jan 5, 2006:
1.319 brad 309: Do not allow users to trick suid programs into re-opening files via
310: /dev/fd.</a>
1.321 brad 311: <li><a href="errata38.html#perl">Jan 5, 2006:
1.319 brad 312: A buffer overflow has been found in the Perl interpreter with the
313: sprintf function which may be exploitable under certain conditions.</a>
1.318 deraadt 314: </ul>
315:
1.323 steven 316: <p>
317: OpenBSD 3.7 and earlier releases are not supported anymore. The following
318: paragraphs only list advisories issued while they were maintained; these
319: releases are likely to be affected by the advisories for more recent releases.
320: <br>
321:
1.318 deraadt 322: <li>
1.312 david 323: <a name="37"></a>
324:
325: <h3><font color="#e00000">OpenBSD 3.7 Security Advisories</font></h3>
326: These are the OpenBSD 3.7 advisories -- all these problems are solved
1.323 steven 327: in <a href="anoncvs.html">OpenBSD current</a>. The
328: <a href="stable.html">patch branch</a> for 3.7 is no longer being maintained,
329: you should update your machine.
1.312 david 330:
331: <p>
332: <ul>
1.322 brad 333: <li><a href="errata37.html#xorg">May 2, 2006:
334: A buffer overflow exists in the Render extension of the X server.</a>
1.321 brad 335: <li><a href="errata37.html#sendmail">Mar 25, 2006:
336: A race condition has been reported to exist in the handling by sendmail
337: of asynchronous signals.</a>
1.320 brad 338: <li><a href="errata37.html#ssh">Feb 12, 2006:
339: Josh Bressers has reported a weakness in OpenSSH caused due to the
340: insecure use of the system(3) function in scp(1) when performing copy
341: operations using filenames that are supplied by the user from the
342: command line.</a>
1.319 brad 343: <li><a href="errata37.html#fd">Jan 5, 2006:
344: Do not allow users to trick suid programs into re-opening files via
345: /dev/fd.</a>
346: <li><a href="errata37.html#perl">Jan 5, 2006:
347: A buffer overflow has been found in the Perl interpreter with the
348: sprintf function which may be exploitable under certain conditions.</a>
1.318 deraadt 349: <li><a href="errata37.html#libz2">Jul 21, 2005:
1.317 millert 350: Fix another buffer overflow in the zlib library that may be exploitable.</a>
1.318 deraadt 351: <li><a href="errata37.html#libz">Jul 6, 2005:
1.316 millert 352: Fix a buffer overflow in the zlib library that may be exploitable.</a>
1.318 deraadt 353: <li><a href="errata37.html#sudo">Jun 20, 2005:
1.316 millert 354: Fix a race condition in sudo(8) that could allow a user
1.315 millert 355: to run arbitrary commands.</a>
1.318 deraadt 356: <li><a href="errata37.html#cvs">Jun 7, 2005:
1.313 brad 357: Fix a buffer overflow, memory leaks, and NULL pointer
358: dereference in cvs(1).</a>
1.312 david 359: </ul>
360:
361: <li>
1.301 miod 362: <a name="36"></a>
363:
364: <h3><font color="#e00000">OpenBSD 3.6 Security Advisories</font></h3>
365: These are the OpenBSD 3.6 advisories -- all these problems are solved
1.323 steven 366: in <a href="anoncvs.html">OpenBSD current</a>. The
367: <a href="stable.html">patch branch</a> for 3.6 is no longer being maintained,
368: you should update your machine.
1.301 miod 369:
370: <p>
1.302 markus 371: <ul>
1.317 millert 372: <li><a href="errata36.html#libz2">Jul 21, 2005:
373: Fix another buffer overflow in the zlib library that may be exploitable.</a>
1.316 millert 374: <li><a href="errata36.html#libz">Jul 6, 2005:
375: Fix a buffer overflow in the zlib library that may be exploitable.</a>
1.315 millert 376: <li><a href="errata36.html#sudo">Jun 20, 2005:
1.316 millert 377: Fix a race condition in sudo(8) that could allow a user
1.315 millert 378: to run arbitrary commands.</a>
1.311 deraadt 379: <li><a href="errata36.html#cvs">Apr 28, 2005:
1.310 brad 380: Fix a buffer overflow, memory leaks, and NULL pointer
381: dereference in cvs(1).</a>
1.311 deraadt 382: <li><a href="errata36.html#telnet">Mar 30, 2005:
1.309 brad 383: Due to buffer overflows in telnet(1), a malicious
384: server or man-in-the-middle attack could allow
385: execution of arbitrary code with the privileges of
386: the user invoking telnet(1).</a>
1.311 deraadt 387: <li><a href="errata36.html#copy">Mar 16, 2005:
1.307 brad 388: More stringent checking should be done in the copy(9)
389: functions to prevent their misuse.</a>
1.311 deraadt 390: <li><a href="errata36.html#locore">Feb 28, 2005:
1.306 brad 391: More stringent checking should be done in the copy(9)
392: functions to prevent their misuse.</a>
1.311 deraadt 393: <li><a href="errata36.html#httpd">Jan 12, 2005:
1.304 brad 394: httpd(8)'s mod_include module fails to properly validate
395: the length of user supplied tag strings prior to copying
1.305 brad 396: them to a local buffer, causing a buffer overflow.</a>
1.311 deraadt 397: <li><a href="errata36.html#pfkey">Dec 14, 2004:
1.302 markus 398: On systems running isakmpd(8) it is possible for a local
399: user to cause kernel memory corruption and system panic by
1.303 markus 400: setting ipsec(4) credentials on a socket.</a>
1.302 markus 401: </ul>
1.301 miod 402:
403: <li>
1.288 matthieu 404: <a name="35"></a>
1.279 deraadt 405:
1.294 david 406: <h3><font color="#e00000">OpenBSD 3.5 Security Advisories</font></h3>
1.279 deraadt 407: These are the OpenBSD 3.5 advisories -- all these problems are solved
1.314 miod 408: in <a href="anoncvs.html">OpenBSD current</a>. The
409: <a href="stable.html">patch branch</a> for 3.5 is no longer being maintained,
410: you should update your machine.
1.279 deraadt 411:
412: <p>
413: <ul>
1.310 brad 414: <li><a href="errata35.html#cvs4">Apr 28, 2005:
415: Fix a buffer overflow, memory leaks, and NULL pointer
416: dereference in cvs(1).</a>
1.309 brad 417: <li><a href="errata35.html#telnet">Mar 30, 2005:
418: Due to buffer overflows in telnet(1), a malicious
419: server or man-in-the-middle attack could allow
420: execution of arbitrary code with the privileges of
421: the user invoking telnet(1).</a>
1.308 brad 422: <li><a href="errata35.html#copy">Mar 16, 2005:
1.307 brad 423: More stringent checking should be done in the copy(9)
424: functions to prevent their misuse.</a>
1.306 brad 425: <li><a href="errata35.html#locore">Feb 28, 2005:
426: More stringent checking should be done in the copy(9)
427: functions to prevent their misuse.</a>
1.304 brad 428: <li><a href="errata35.html#httpd3">Jan 12, 2005:
429: httpd(8)'s mod_include module fails to properly validate
430: the length of user supplied tag strings prior to copying
1.305 brad 431: them to a local buffer, causing a buffer overflow.</a>
1.302 markus 432: <li><a href="errata35.html#pfkey">Dec 14, 2004:
433: On systems running isakmpd(8) it is possible for a local
434: user to cause kernel memory corruption and system panic by
1.303 markus 435: setting ipsec(4) credentials on a socket.</a>
1.301 miod 436: <li><a href="errata35.html#radius">Sep 20, 2004:
1.299 millert 437: Radius-based authentication is vulnerable to spoofed replies.</a>
1.301 miod 438: <li><a href="errata35.html#xpm">Sep 16, 2004:
1.298 brad 439: The Xpm library has vulnerabilities when parsing malicious images.</a>
1.301 miod 440: <li><a href="errata35.html#httpd2"> Sep 10, 2004:
1.297 brad 441: httpd(8)'s mod_rewrite module can be made to write one zero byte in
442: an arbitrary memory position outside of a char array, causing a DoS
443: or possibly buffer overflows.</a>
1.301 miod 444: <li><a href="errata35.html#httpd"> Jun 12, 2004:
1.300 deraadt 445: Multiple vulnerabilities have been found in httpd(8) / mod_ssl.</a>
1.301 miod 446: <li><a href="errata35.html#isakmpd"> Jun 10, 2004:
1.291 hshoexer 447: isakmpd(8) still has issues with unauthorized SA deletion,
1.293 brad 448: an attacker can delete IPsec tunnels at will.</a>
1.301 miod 449: <li><a href="errata35.html#cvs3"> Jun 9, 2004:
1.290 millert 450: Multiple remote vulnerabilities have been found in the cvs(1)
451: server which can be used by CVS clients to crash or execute
1.293 brad 452: arbitrary code on the server.</a>
1.301 miod 453: <li><a href="errata35.html#kerberos"> May 30, 2004:
1.289 beck 454: kdc(8) performs inadequate checking of request fields, leading
455: to the possibility of principal impersonation from other
456: Kerberos realms if they are trusted with a cross-realm trust.</a>
1.301 miod 457: <li><a href="errata35.html#xdm"> May 26, 2004:
1.287 matthieu 458: xdm(1) ignores the requestPort resource and creates a
1.293 brad 459: listening socket regardless of the setting in xdm-config.</a>
1.301 miod 460: <li><a href="errata35.html#cvs2"> May 20, 2004:
1.286 otto 461: A buffer overflow in the cvs(1) server has been found,
462: which can be used by CVS clients to execute arbitrary code on
1.293 brad 463: the server.</a>
1.301 miod 464: <li><a href="errata35.html#procfs"> May 13, 2004:
1.282 tedu 465: Integer overflow problems were found in procfs, allowing
1.293 brad 466: reading of arbitrary kernel memory.</a>
1.301 miod 467: <li><a href="errata35.html#cvs"> May 5, 2004:
1.281 otto 468: Pathname validation problems have been found in cvs(1),
469: allowing clients and servers access to files outside the
1.293 brad 470: repository or local CVS tree.</a>
1.279 deraadt 471: </ul>
472:
473: <p>
474: <li>
1.288 matthieu 475: <a name="34"></a>
1.261 david 476:
1.294 david 477: <h3><font color="#e00000">OpenBSD 3.4 Security Advisories</font></h3>
1.261 david 478: These are the OpenBSD 3.4 advisories -- all these problems are solved
1.301 miod 479: in <a href="anoncvs.html">OpenBSD current</a>. The
480: <a href="stable.html">patch branch</a> for 3.4 is no longer being maintained,
481: you should update your machine.
1.261 david 482: <p>
483: <ul>
1.302 markus 484: <li><a href="errata34.html#pfkey">Dec 14, 2004:
485: On systems running isakmpd(8) it is possible for a local
486: user to cause kernel memory corruption and system panic by
1.303 markus 487: setting ipsec(4) credentials on a socket.</a>
1.298 brad 488: <li><a href="errata34.html#xpm">Sep 16, 2004:
489: The Xpm library has vulnerabilities when parsing malicious images.</a>
1.297 brad 490: <li><a href="errata34.html#httpd4"> Sep 10, 2004:
491: httpd(8)'s mod_rewrite module can be made to write one zero byte in
492: an arbitrary memory position outside of a char array, causing a DoS
493: or possibly buffer overflows.</a>
1.294 david 494: <li><a href="errata34.html#httpd3"> Jun 12, 2004:
1.300 deraadt 495: Multiple vulnerabilities have been found in httpd(8) / mod_ssl.</a>
1.294 david 496: <li><a href="errata34.html#isakmpd3"> Jun 10, 2004:
1.292 brad 497: isakmpd(8) still has issues with unauthorized SA deletion,
1.293 brad 498: an attacker can delete IPsec tunnels at will.</a>
1.294 david 499: <li><a href="errata34.html#cvs3"> Jun 9, 2004:
1.290 millert 500: Multiple remote vulnerabilities have been found in the cvs(1)
501: server which can be used by CVS clients to crash or execute
1.293 brad 502: arbitrary code on the server.</a>
1.294 david 503: <li><a href="errata34.html#kerberos"> May 30, 2004:
1.289 beck 504: kdc(8) performs inadequate checking of request fields, leading
505: to the possibility of principal impersonation from other
506: Kerberos realms if they are trusted with a cross-realm trust.</a>
1.294 david 507: <li><a href="errata34.html#cvs2"> May 20, 2004:
1.286 otto 508: A buffer overflow in the cvs(1) server has been found,
509: which can be used by CVS clients to execute arbitrary code on
510: the server.</a>
1.294 david 511: <li><a href="errata34.html#procfs"> May 13, 2004:
1.282 tedu 512: Integer overflow problems were found in procfs, allowing
513: reading of arbitrary kernel memory.</a>
1.294 david 514: <li><a href="errata34.html#cvs"> May 5, 2004:
1.281 otto 515: Pathname validation problems have been found in cvs(1),
516: allowing clients and servers access to files outside the
517: repository or local CVS tree.</a>
1.294 david 518: <li><a href="errata34.html#openssl"> March 17, 2004:
1.277 millert 519: A missing check for a NULL-pointer dereference may allow a
1.281 otto 520: remote attacker to crash applications using OpenSSL.</a>
1.294 david 521: <li><a href="errata34.html#isakmpd2"> March 17, 2004:
1.276 brad 522: Defects in the payload validation and processing functions of
523: isakmpd have been discovered. An attacker could send malformed
524: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.294 david 525: <li><a href="errata34.html#httpd2"> March 13, 2004:
1.275 brad 526: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
527: access module, using IP addresses without a netmask on big endian
528: 64-bit platforms causes the rules to fail to match.</a>
1.294 david 529: <li><a href="errata34.html#ip6"> February 8, 2004:
1.272 dhartmei 530: An IPv6 MTU handling problem exists that could be used by an
531: attacker to cause a denial of service attack.</a>
1.294 david 532: <li><a href="errata34.html#sysvshm"> February 5, 2004:
1.271 millert 533: A reference counting bug in shmat(2) could be used to write to
534: kernel memory under certain circumstances.</a>
1.294 david 535: <li><a href="errata34.html#isakmpd">January 13, 2004:
1.266 brad 536: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 537: by Thomas Walpuski.</a>
1.294 david 538: <li><a href="errata34.html#ibcs2">November 17, 2003:
1.264 henning 539: It may be possible for a local user to overrun the stack in
540: compat_ibcs2(8) and cause a kernel panic.</a>
1.294 david 541: <li><a href="errata34.html#asn1">November 1, 2003:
1.262 margarid 542: The use of certain ASN.1 encodings or malformed public keys may
543: allow an attacker to mount a denial of service attack against
544: applications linked with ssl(3).</a>
1.261 david 545: </ul>
546:
547: <li>
1.288 matthieu 548: <a name="33"></a>
1.246 deraadt 549:
1.294 david 550: <h3><font color="#e00000">OpenBSD 3.3 Security Advisories</font></h3>
1.246 deraadt 551: These are the OpenBSD 3.3 advisories -- all these problems are solved
1.294 david 552: in <a href="anoncvs.html">OpenBSD current</a>. The
553: <a href="stable.html">patch branch</a> for 3.3 is no longer being maintained,
1.284 otto 554: you should update your machine.
1.246 deraadt 555: <p>
556: <ul>
1.294 david 557: <li><a href="errata33.html#cvs"> May 5, 2004:
1.281 otto 558: Pathname validation problems have been found in cvs(1),
559: allowing clients and servers access to files outside the
560: repository or local CVS tree.</a>
1.294 david 561: <li><a href="errata33.html#openssl"> March 17, 2004:
1.277 millert 562: A missing check for a NULL-pointer dereference may allow a
1.281 otto 563: remote attacker to crash applications using OpenSSL.</a>
1.294 david 564: <li><a href="errata33.html#isakmpd2"> March 17, 2004:
1.276 brad 565: Defects in the payload validation and processing functions of
566: isakmpd have been discovered. An attacker could send malformed
567: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.294 david 568: <li><a href="errata33.html#httpd2"> March 13, 2004:
1.275 brad 569: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
570: access module, using IP addresses without a netmask on big endian
571: 64-bit platforms causes the rules to fail to match.</a>
1.294 david 572: <li><a href="errata33.html#ip6"> February 8, 2004:
1.275 brad 573: An IPv6 MTU handling problem exists that could be used by an
574: attacker to cause a denial of service attack.</a>
1.294 david 575: <li><a href="errata33.html#sysvshm"> February 5, 2004:
1.271 millert 576: A reference counting bug in shmat(2) could be used to write to
577: kernel memory under certain circumstances.</a>
1.294 david 578: <li><a href="errata33.html#isakmpd">January 15, 2004:
1.268 brad 579: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 580: by Thomas Walpuski.</a>
1.294 david 581: <li><a href="errata33.html#ibcs2">November 17, 2003:
1.264 henning 582: It may be possible for a local user to execute arbitrary code
583: resulting in escalation of privileges due to a stack overrun
584: in compat_ibcs2(8).</a>
1.294 david 585: <li><a href="errata33.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).</a>
1.294 david 589: <li><a href="errata33.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="errata33.html#sendmail">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="errata33.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="errata33.html#sysvsem">September 10, 2003:
1.254 millert 599: Root may be able to reduce the security level by taking advantage of
600: an integer overflow when the semaphore limits are made very large.</a>
1.294 david 601: <li><a href="errata33.html#semget">August 20, 2003:
1.252 millert 602: An improper bounds check in the kernel may allow a local user
603: to panic the kernel.</a>
1.294 david 604: <li><a href="errata33.html#realpath">August 4, 2003:
1.249 millert 605: An off-by-one error exists in the C library function realpath(3)
606: may allow an attacker to gain escalated privileges.</a>
1.246 deraadt 607: </ul>
608:
1.265 miod 609:
1.247 david 610: <p>
1.246 deraadt 611: <li>
1.288 matthieu 612: <a name="32"></a>
1.224 deraadt 613:
1.294 david 614: <h3><font color="#e00000">OpenBSD 3.2 Security Advisories</font></h3>
1.224 deraadt 615: These are the OpenBSD 3.2 advisories -- all these problems are solved
1.294 david 616: in <a href="anoncvs.html">OpenBSD current</a>. The
617: <a href="stable.html">patch branch</a> for 3.2 is no longer being maintained,
1.265 miod 618: you should update your machine.
1.224 deraadt 619: <p>
620: <ul>
1.294 david 621: <li><a href="errata32.html#asn1">October 1, 2003:
1.257 millert 622: The use of certain ASN.1 encodings or malformed public keys may
623: allow an attacker to mount a denial of service attack against
624: applications linked with ssl(3). This does not affect OpenSSH.</a>
1.294 david 625: <li><a href="errata32.html#pfnorm">September 24, 2003:
1.258 beck 626: Access of freed memory in pf(4) could be used to
1.260 margarid 627: remotely panic a machine using scrub rules.</a>
1.294 david 628: <li><a href="errata32.html#sendmail4">September 17, 2003:
1.256 millert 629: A buffer overflow in the address parsing in
630: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 631: <li><a href="errata32.html#sshbuffer">September 16, 2003:
1.255 millert 632: OpenSSH versions prior to 3.7 contains a buffer management error
633: that is potentially exploitable.</a>
1.294 david 634: <li><a href="errata32.html#sendmail3">August 25, 2003:
1.253 brad 635: Fix for a potential security issue in
636: sendmail(8) with respect to DNS maps.</a>
1.294 david 637: <li><a href="errata32.html#realpath">August 4, 2003:
1.249 millert 638: An off-by-one error exists in the C library function realpath(3)
639: may allow an attacker to gain escalated privileges.</a>
1.294 david 640: <li><a href="errata32.html#sendmail2">March 31, 2003:
1.244 miod 641: A buffer overflow in the address parsing in
642: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 643: <li><a href="errata32.html#kerberos">March 24, 2003:
1.242 millert 644: A cryptographic weaknesses in the Kerberos v4 protocol can be
645: exploited on Kerberos v5 as well.</a>
1.294 david 646: <li><a href="errata32.html#kpr">March 19, 2003:
1.241 jufi 647: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 648: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.294 david 649: <li><a href="errata32.html#blinding">March 18, 2003:
1.239 miod 650: Various SSL and TLS operations in OpenSSL are vulnerable to
651: timing attacks.</a>
1.294 david 652: <li><a href="errata32.html#lprm">March 5, 2003:
1.238 millert 653: A buffer overflow in lprm(1) may allow an attacker to elevate
654: privileges to user daemon.</a>.
1.294 david 655: <li><a href="errata32.html#sendmail">March 3, 2003:
1.237 miod 656: A buffer overflow in the envelope comments processing in
657: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 658: <li><a href="errata32.html#httpd">February 25, 2003:
1.236 margarid 659: httpd(8) leaks file inode numbers via ETag header as well as
660: child PIDs in multipart MIME boundary generation. This could
661: lead, for example, to NFS exploitation because it uses inode
662: numbers as part of the file handle.</a>
1.294 david 663: <li><a href="errata32.html#ssl">February 22, 2003:
1.234 margarid 664: In ssl(8) an information leak can occur via timing by performing
665: a MAC computation even if incorrect block cipher padding has
666: been found, this is a countermeasure. Also, check for negative
667: sizes, in allocation routines.</a>
1.294 david 668: <li><a href="errata32.html#cvs">January 20, 2003:
1.232 millert 669: A double free exists in cvs(1) that could lead to privilege
670: escalation for cvs configurations where the cvs command is
1.233 margarid 671: run as a privileged user.</a>
1.294 david 672: <li><a href="errata32.html#named">November 14, 2002:
1.230 millert 673: A buffer overflow exists in named(8) that could lead to a
674: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 675: <li><a href="errata32.html#pool">November 6, 2002:
1.233 margarid 676: A logic error in the pool kernel memory allocator could cause
677: memory corruption in low-memory situations, causing the system
678: to crash.</a>
1.294 david 679: <li><a href="errata32.html#smrsh">November 6, 2002:
1.229 miod 680: An attacker can bypass smrsh(8)'s restrictions and execute
681: arbitrary commands with the privileges of his own account.</a>
1.294 david 682: <li><a href="errata32.html#pfbridge">November 6, 2002:
1.233 margarid 683: Network bridges running pf with scrubbing enabled could cause
684: mbuf corruption, causing the system to crash.</a>
1.294 david 685: <li><a href="errata32.html#kadmin">October 21, 2002:
1.228 miod 686: A buffer overflow can occur in the kadmind(8) daemon, leading
687: to possible remote crash or exploit.</a>
1.224 deraadt 688: </ul>
689:
1.227 miod 690: <p>
691: <li>
1.288 matthieu 692: <a name="31"></a>
1.203 deraadt 693:
1.294 david 694: <h3><font color="#e00000">OpenBSD 3.1 Security Advisories</font></h3>
1.203 deraadt 695: These are the OpenBSD 3.1 advisories -- all these problems are solved
1.294 david 696: in <a href="anoncvs.html">OpenBSD current</a>. The
697: <a href="stable.html">patch branch</a> for 3.1 is no longer being maintained,
1.258 beck 698: you should update your machine.
1.203 deraadt 699:
700: <p>
701: <ul>
1.294 david 702: <li><a href="errata31.html#sendmail2">March 31, 2003:
1.244 miod 703: A buffer overflow in the address parsing in
704: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 705: <li><a href="errata31.html#kerberos">March 24, 2003:
1.242 millert 706: A cryptographic weaknesses in the Kerberos v4 protocol can be
707: exploited on Kerberos v5 as well.</a>
1.294 david 708: <li><a href="errata31.html#kpr">March 19, 2003:
1.241 jufi 709: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 710: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.294 david 711: <li><a href="errata31.html#blinding">March 18, 2003:
1.239 miod 712: Various SSL and TLS operations in OpenSSL are vulnerable to
713: timing attacks.</a>
1.294 david 714: <li><a href="errata31.html#lprm">March 4, 2003:
1.238 millert 715: A buffer overflow in lprm(1) may allow an attacker to gain
716: root privileges.</a>
1.294 david 717: <li><a href="errata31.html#sendmail">March 3, 2003:
1.237 miod 718: A buffer overflow in the envelope comments processing in
719: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 720: <li><a href="errata31.html#ssl2">February 23, 2003:
1.235 miod 721: In ssl(8) an information leak can occur via timing by performing
722: a MAC computation even if incorrect block cipher padding has
723: been found, this is a countermeasure. Also, check for negative
724: sizes, in allocation routines.</a>
1.294 david 725: <li><a href="errata31.html#cvs">January 20, 2003:
1.232 millert 726: A double free exists in cvs(1) that could lead to privilege
727: escalation for cvs configurations where the cvs command is
1.294 david 728: run as a privileged user</a>.
729: <li><a href="errata31.html#named">November 14, 2002:
1.230 millert 730: A buffer overflow exists in named(8) that could lead to a
731: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 732: <li><a href="errata31.html#kernresource">November 6, 2002:
1.229 miod 733: Incorrect argument checking in the getitimer(2) system call
734: may allow an attacker to crash the system.</a>
1.294 david 735: <li><a href="errata31.html#smrsh">November 6, 2002:
1.229 miod 736: An attacker can bypass smrsh(8)'s restrictions and execute
737: arbitrary commands with the privileges of his own account.</a>
1.294 david 738: <li><a href="errata31.html#kadmin">October 21, 2002:
1.226 miod 739: A buffer overflow can occur in the kadmind(8) daemon, leading
740: to possible remote crash or exploit.</a>
1.294 david 741: <li><a href="errata31.html#kerntime">October 2, 2002:
1.222 jason 742: Incorrect argument checking in the setitimer(2) system call
743: may allow an attacker to write to kernel memory.</a>
1.294 david 744: <li><a href="errata31.html#scarg">August 11, 2002:
1.221 provos 745: An insufficient boundary check in the select system call
1.220 miod 746: allows an attacker to overwrite kernel memory and execute arbitrary code
747: in kernel context.</a>
1.294 david 748: <li><a href="errata31.html#ssl">July 30, 2002:
1.218 miod 749: Several remote buffer overflows can occur in the SSL2 server and SSL3
750: client of the ssl(8) library, as in the ASN.1 parser code in the
751: crypto(3) library, all of them being potentially remotely
752: exploitable.</a>
1.294 david 753: <li><a href="errata31.html#xdr">July 29, 2002:
1.218 miod 754: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
755: possible remote crash.</a>
1.294 david 756: <li><a href="errata31.html#pppd">July 29, 2002:
1.218 miod 757: A race condition exists in the pppd(8) daemon which may cause it to
758: alter the file permissions of an arbitrary file.</a>
1.294 david 759: <li><a href="errata31.html#isakmpd">July 5, 2002:
1.218 miod 760: Receiving IKE payloads out of sequence can cause isakmpd(8) to
761: crash.</a>
1.294 david 762: <li><a href="errata31.html#ktrace">June 27, 2002:
1.215 miod 763: The kernel would let any user ktrace set[ug]id processes.</a>
1.294 david 764: <li><a href="errata31.html#modssl">June 26, 2002:
1.213 miod 765: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 766: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.294 david 767: <li><a href="errata31.html#resolver">June 25, 2002:
1.212 millert 768: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 769: <li><a href="errata31.html#sshd">June 24, 2002:
1.216 deraadt 770: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 771: input validation error that can result in an integer overflow and
772: privilege escalation.</a>
1.294 david 773: <li><a href="errata31.html#httpd">June 19, 2002:
1.211 miod 774: A buffer overflow can occur during the interpretation of chunked
775: encoding in httpd(8), leading to possible remote crash.</a>
1.294 david 776: <li><a href="errata31.html#sshbsdauth">May 22, 2002:
1.209 markus 777: Under certain conditions, on systems using YP with netgroups
778: in the password database, it is possible that sshd(8) does
779: ACL checks for the requested user name but uses the password
780: database entry of a different user for authentication. This
781: means that denied users might authenticate successfully
782: while permitted users could be locked out.</a>
1.294 david 783: <li><a href="errata31.html#fdalloc2">May 8, 2002:
1.208 millert 784: A race condition exists that could defeat the kernel's
785: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 786: <li><a href="errata31.html#sudo">April 25, 2002:
1.205 millert 787: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 788: <li><a href="errata31.html#sshafs">April 22, 2002:
1.205 millert 789: A local user can gain super-user privileges due to a buffer
790: overflow in sshd(8) if AFS has been configured on the system
791: or if KerberosTgtPassing or AFSTokenPassing has been enabled
792: in the sshd_config file.</a>
1.203 deraadt 793: </ul>
794:
1.235 miod 795: <p>
1.203 deraadt 796: <li>
1.288 matthieu 797: <a name="30"></a>
1.187 deraadt 798:
1.294 david 799: <h3><font color="#e00000">OpenBSD 3.0 Security Advisories</font></h3>
1.187 deraadt 800: These are the OpenBSD 3.0 advisories -- all these problems are solved
1.294 david 801: in <a href="anoncvs.html">OpenBSD current</a>. The
802: <a href="stable.html">patch branch</a> for 3.0 is no longer being maintained,
1.258 beck 803: you should update your machine.
1.187 deraadt 804:
805: <p>
806: <ul>
1.294 david 807: <li><a href="errata30.html#named">November 14, 2002:
1.230 millert 808: A buffer overflow exists in named(8) that could lead to a
809: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 810: <li><a href="errata30.html#kernresource">November 6, 2002:
1.229 miod 811: Incorrect argument checking in the getitimer(2) system call
812: may allow an attacker to crash the system.</a>
1.294 david 813: <li><a href="errata30.html#smrsh">November 6, 2002:
1.229 miod 814: An attacker can bypass smrsh(8)'s restrictions and execute
815: arbitrary commands with the privileges of his own account.</a>
1.294 david 816: <li><a href="errata30.html#kadmin">October 21, 2002:
1.226 miod 817: A buffer overflow can occur in the kadmind(8) daemon, leading
818: to possible remote crash or exploit.</a>
1.294 david 819: <li><a href="errata30.html#kerntime">October 7, 2002:
1.223 miod 820: Incorrect argument checking in the setitimer(2) system call
821: may allow an attacker to write to kernel memory.</a>
1.294 david 822: <li><a href="errata30.html#scarg">August 11, 2002:
1.220 miod 823: An insufficient boundary check in the select and poll system calls
824: allows an attacker to overwrite kernel memory and execute arbitrary code
825: in kernel context.</a>
1.294 david 826: <li><a href="errata30.html#ssl">July 30, 2002:
1.218 miod 827: Several remote buffer overflows can occur in the SSL2 server and SSL3
828: client of the ssl(8) library, as in the ASN.1 parser code in the
829: crypto(3) library, all of them being potentially remotely
830: exploitable.</a>
1.294 david 831: <li><a href="errata30.html#xdr">July 29, 2002:
1.218 miod 832: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
833: possible remote crash.</a>
1.294 david 834: <li><a href="errata30.html#pppd">July 29, 2002:
1.218 miod 835: A race condition exists in the pppd(8) daemon which may cause it to
836: alter the file permissions of an arbitrary file.</a>
1.294 david 837: <li><a href="errata30.html#isakmpd2">July 5, 2002:
1.218 miod 838: Receiving IKE payloads out of sequence can cause isakmpd(8) to
839: crash.</a>
1.294 david 840: <li><a href="errata30.html#ktrace">June 27, 2002:
1.215 miod 841: The kernel would let any user ktrace set[ug]id processes.</a>
1.294 david 842: <li><a href="errata30.html#resolver">June 25, 2002:
1.212 millert 843: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 844: <li><a href="errata30.html#sshdauth">June 24, 2002:
1.216 deraadt 845: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 846: input validation error that can result in an integer overflow and
847: privilege escalation.</a>
1.294 david 848: <li><a href="errata30.html#modssl">June 24, 2002:
1.213 miod 849: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 850: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.294 david 851: <li><a href="errata30.html#httpd">June 19, 2002:
1.213 miod 852: A buffer overflow can occur during the interpretation of chunked
853: encoding in httpd(8), leading to possible remote crash.</a>
1.294 david 854: <li><a href="errata30.html#fdalloc2">May 8, 2002:
1.208 millert 855: A race condition exists that could defeat the kernel's
856: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 857: <li><a href="errata30.html#sudo2">April 25, 2002:
1.205 millert 858: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 859: <li><a href="errata30.html#sshafs">April 22, 2002:
1.205 millert 860: A local user can gain super-user privileges due to a buffer
861: overflow in sshd(8) if AFS has been configured on the system
862: or if KerberosTgtPassing or AFSTokenPassing has been enabled
863: in the sshd_config file.</a>
1.294 david 864: <li><a href="errata30.html#mail">April 11, 2002:
1.202 millert 865: The mail(1) was interpreting tilde escapes even when invoked
866: in non-interactive mode. As mail(1) is called as root from cron,
867: this can lead to a local root compromise.</a>
1.294 david 868: <li><a href="errata30.html#approval">March 19, 2002:
1.201 millert 869: Under certain conditions, on systems using YP with netgroups in
870: the password database, it is possible for the rexecd(8) and rshd(8)
871: daemons to execute a shell from a password database entry for a
872: different user. Similarly, atrun(8) may change to the wrong
873: home directory when running jobs.</a>
1.294 david 874: <li><a href="errata30.html#zlib">March 13, 2002:
1.200 millert 875: A potential double free() exists in the zlib library;
876: this is not exploitable on OpenBSD.
877: The kernel also contains a copy of zlib; it is not
878: currently known if the kernel zlib is exploitable.</a>
1.294 david 879: <li><a href="errata30.html#openssh">March 8, 2002:
1.198 millert 880: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 881: may allow a local user to gain super-user privileges.</a>
1.294 david 882: <li><a href="errata30.html#ptrace">January 21, 2002:
1.192 jason 883: A race condition between the ptrace(2) and execve(2) system calls
884: allows an attacker to modify the memory contents of suid/sgid
885: processes which could lead to compromise of the super-user account.</a>
1.294 david 886: <li><a href="errata30.html#sudo">January 17, 2002:
1.191 millert 887: There is a security hole in sudo(8) that can be exploited
888: when the Postfix sendmail replacement is installed that may
889: allow an attacker on the local host to gain root privileges.</a>
1.294 david 890: <li><a href="errata30.html#lpd">November 28, 2001:
1.189 millert 891: An attacker can trick a machine running the lpd daemon into
892: creating new files in the root directory from a machine with
893: remote line printer access.</a>
1.294 david 894: <li><a href="errata30.html#vi.recover">November 13, 2001:
1.188 millert 895: The vi.recover script can be abused in such a way as
896: to cause arbitrary zero-length files to be removed.</a>
1.294 david 897: <li><a href="errata30.html#pf">November 13, 2001:
1.190 mpech 898: pf(4) was incapable of dealing with certain ipv6 icmp packets,
899: resulting in a crash.</a>
1.294 david 900: <li><a href="errata30.html#sshd">November 12, 2001:
1.190 mpech 901: A security hole that may allow an attacker to partially authenticate
902: if -- and only if -- the administrator has enabled KerberosV.</a>
1.187 deraadt 903: </ul>
904:
905: <p>
906: <li>
1.288 matthieu 907: <a name="29"></a>
1.173 deraadt 908:
1.294 david 909: <h3><font color="#e00000">OpenBSD 2.9 Security Advisories</font></h3>
1.173 deraadt 910: These are the OpenBSD 2.9 advisories -- all these problems are solved
1.294 david 911: in <a href="anoncvs.html">OpenBSD current</a>. The
912: <a href="stable.html">patch branch</a>. for 2.9 is no longer being maintained,
1.258 beck 913: you should update your machine.
914:
1.173 deraadt 915:
916: <p>
917: <ul>
1.294 david 918: <li><a href="errata29.html#resolver">June 25, 2002:
1.212 millert 919: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 920: <li><a href="errata29.html#fdalloc2">May 8, 2002:
1.208 millert 921: A race condition exists that could defeat the kernel's
922: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 923: <li><a href="errata29.html#sudo2">April 25, 2002:
1.207 millert 924: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 925: <li><a href="errata29.html#sshafs">April 22, 2002:
1.206 millert 926: A local user can gain super-user privileges due to a buffer
927: overflow in sshd(8) if AFS has been configured on the system
928: or if KerberosTgtPassing or AFSTokenPassing has been enabled
929: in the sshd_config file.</a>
1.294 david 930: <li><a href="errata29.html#mail">April 11, 2002:
1.202 millert 931: The mail(1) was interpreting tilde escapes even when invoked
932: in non-interactive mode. As mail(1) is called as root from cron,
933: this can lead to a local root compromise.</a>
1.294 david 934: <li><a href="errata29.html#zlib">March 13, 2002:
1.200 millert 935: A potential double free() exists in the zlib library;
936: this is not exploitable on OpenBSD.
937: The kernel also contains a copy of zlib; it is not
938: currently known if the kernel zlib is exploitable.</a>
1.294 david 939: <li><a href="errata29.html#openssh">March 8, 2002:
1.198 millert 940: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 941: may allow a local user to gain super-user privileges.</a>
1.294 david 942: <li><a href="errata29.html#ptrace">January 21, 2002:
1.198 millert 943: A race condition between the ptrace(2) and execve(2) system calls
944: allows an attacker to modify the memory contents of suid/sgid
945: processes which could lead to compromise of the super-user account.</a>
1.294 david 946: <li><a href="errata29.html#sudo">January 17, 2002:
1.191 millert 947: There is a security hole in sudo(8) that can be exploited
948: when the Postfix sendmail replacement is installed that may
949: allow an attacker on the local host to gain root privileges.</a>
1.294 david 950: <li><a href="errata29.html#lpd2">November 28, 2001:
1.189 millert 951: An attacker can trick a machine running the lpd daemon into
952: creating new files in the root directory from a machine with
953: remote line printer access.</a>
1.294 david 954: <li><a href="errata29.html#vi.recover">November 13, 2001:
1.190 mpech 955: The vi.recover script can be abused in such a way as
956: to cause arbitrary zero-length files to be removed.</a>
1.294 david 957: <li><a href="errata29.html#uucp">September 11, 2001:
1.184 millert 958: A security hole exists in uuxqt(8) that may allow an
959: attacker to gain root privileges.</a>
1.294 david 960: <li><a href="errata29.html#lpd">August 29, 2001:
1.183 millert 961: A security hole exists in lpd(8) that may allow an
962: attacker to gain root privileges if lpd is running.</a>
1.294 david 963: <li><a href="errata29.html#sendmail2">August 21, 2001:
1.181 millert 964: A security hole exists in sendmail(8) that may allow an
965: attacker on the local host to gain root privileges.</a>
1.294 david 966: <li><a href="errata29.html#nfs">July 30, 2001:
1.180 jason 967: A kernel buffer overflow in the NFS code can be used to execute
968: arbitrary code by users with mount privileges (only root by
1.181 millert 969: default).</a>
1.294 david 970: <li><a href="errata29.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="errata29.html#sshcookie">June 12, 2001:
1.177 markus 973: sshd(8) allows users to delete arbitrary files named "cookies"
974: if X11 forwarding is enabled. X11 forwarding is disabled
975: by default.</a>
1.294 david 976: <li><a href="errata29.html#fts">May 30, 2001:
1.176 millert 977: Programs using the fts routines can be tricked into changing
978: into the wrong directory.</a>
1.294 david 979: <li><a href="errata29.html#sendmail">May 29, 2001:
1.174 millert 980: Sendmail signal handlers contain unsafe code,
981: leading to numerous race conditions.</a>
1.173 deraadt 982: </ul>
983:
984: <p>
985: <li>
1.288 matthieu 986: <a name="28"></a>
1.152 deraadt 987:
1.294 david 988: <h3><font color="#e00000">OpenBSD 2.8 Security Advisories</font></h3>
1.152 deraadt 989: These are the OpenBSD 2.8 advisories -- all these problems are solved
1.294 david 990: in <a href="anoncvs.html">OpenBSD current</a>. The
991: <a href="stable.html">patch branch</a>. for 2.8 is no longer being maintained,
1.258 beck 992: you should update your machine.
993:
1.152 deraadt 994:
995: <p>
996: <ul>
1.294 david 997: <li><a href="errata28.html#uucp">September 11, 2001:
1.184 millert 998: A security hole exists in uuxqt(8) that may allow an
999: attacker to gain root privileges.</a>
1.294 david 1000: <li><a href="errata28.html#lpd">August 29, 2001:
1.183 millert 1001: A security hole exists in lpd(8) that may allow an
1002: attacker to gain root privileges if lpd is running.</a>
1.294 david 1003: <li><a href="errata28.html#sendmail2">August 21, 2001:
1.181 millert 1004: A security hole exists in sendmail(8) that may allow an
1005: attacker on the local host to gain root privileges.</a>
1.294 david 1006: <li><a href="errata28.html#kernexec">June 15, 2001:
1.178 aaron 1007: A race condition in the kernel can lead to local root compromise.</a>
1.294 david 1008: <li><a href="errata28.html#fts">May 30, 2001:
1.176 millert 1009: Programs using the fts routines can be tricked into changing
1010: into the wrong directory.</a>
1.294 david 1011: <li><a href="errata28.html#sendmail">May 29, 2001:
1.175 millert 1012: Sendmail signal handlers contain unsafe code,
1013: leading to numerous race conditions.</a>
1.294 david 1014: <li><a href="errata28.html#ipf_frag">Apr 23, 2001:
1.231 mickey 1015: IPF contains a serious bug with its handling of fragment caching.</a>
1.294 david 1016: <li><a href="errata28.html#glob_limit">Apr 23, 2001:
1.172 ericj 1017: ftpd(8) contains a potential DoS relating to glob(3).</a>
1.294 david 1018: <li><a href="errata28.html#glob">Apr 10, 2001:
1.170 ericj 1019: The glob(3) library call contains multiple buffer overflows.</a>
1.294 david 1020: <li><a href="errata28.html#readline">Mar 18, 2001:
1.169 millert 1021: The readline library creates history files with permissive modes based on the user's umask.</a>
1.294 david 1022: <li><a href="errata28.html#ipsec_ah">Mar 2, 2001:
1.167 ericj 1023: Insufficient checks in the IPSEC AH IPv4 option handling code can lead to a buffer overrun in the kernel.</a>
1.294 david 1024: <li><a href="errata28.html#userldt">Mar 2, 2001:
1.168 horacio 1025: The <b>USER_LDT</b> kernel option allows an attacker to gain access to privileged areas of kernel memory.</a>
1.294 david 1026: <li><a href="errata28.html#sudo">Feb 22, 2001:
1.171 millert 1027: a non-exploitable buffer overflow was fixed in sudo(8).</a>
1.294 david 1028: <li><a href="errata28.html#named">Jan 29, 2001:
1.163 jason 1029: merge named(8) with ISC BIND 4.9.8-REL, which fixes some buffer vulnerabilities.</a>
1.294 david 1030: <li><a href="errata28.html#rnd">Jan 22, 2001:
1.162 jason 1031: rnd(4) did not use all of its input when written to.</a>
1.294 david 1032: <li><a href="errata28.html#xlock">Dec 22, 2000:
1.159 ericj 1033: xlock(1)'s authentication was re-done to authenticate via a named pipe. (patch and new xlock binaries included).</a>
1.294 david 1034: <li><a href="errata28.html#procfs">Dec 18, 2000:
1.157 ericj 1035: Procfs contains numerous overflows. Procfs is not used by default in OpenBSD. (patch included).</a>
1.294 david 1036: <li><a href="errata28.html#kerberos2">Dec 10, 2000:
1.156 deraadt 1037: Another problem exists in KerberosIV libraries (patch included).</a>
1.294 david 1038: <li><a href="errata28.html#kerberos">Dec 7, 2000:
1.155 deraadt 1039: A set of problems in KerberosIV exist (patch included).</a>
1.294 david 1040: <li><a href="errata28.html#ftpd">Dec 4, 2000:
1.154 millert 1041: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.152 deraadt 1042: </ul>
1043:
1044: <p>
1045: <li>
1.288 matthieu 1046: <a name="27"></a>
1.124 deraadt 1047:
1.294 david 1048: <h3><font color="#e00000">OpenBSD 2.7 Security Advisories</font></h3>
1.124 deraadt 1049: These are the OpenBSD 2.7 advisories -- all these problems are solved
1.294 david 1050: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.124 deraadt 1051: OpenBSD 2.6 advisories listed below are fixed in OpenBSD 2.7.
1052:
1053: <p>
1054: <ul>
1.294 david 1055: <li><a href="errata27.html#readline">Mar 18, 2001:
1.169 millert 1056: The readline library creates history files with permissive modes based on the user's umask.</a>
1.294 david 1057: <li><a href="errata27.html#sudo">Feb 22, 2001:
1.169 millert 1058: a buffer overflow was fixed in sudo(8).</a>
1.294 david 1059: <li><a href="errata27.html#ftpd">Dec 4, 2000:
1.154 millert 1060: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.294 david 1061: <li><a href="errata27.html#sshforwarding">Nov 10, 2000:
1.152 deraadt 1062: Hostile servers can force OpenSSH clients to do agent or X11 forwarding.
1063: (patch included)</a>
1.294 david 1064: <li><a href="errata27.html#xtrans">Oct 26, 2000:
1.151 matthieu 1065: X11 libraries have 2 potential overflows in xtrans code.
1066: (patch included)</a>
1.294 david 1067: <li><a href="errata27.html#httpd">Oct 18, 2000:
1.150 beck 1068: Apache mod_rewrite and mod_vhost_alias modules could expose files
1069: on the server in certain configurations if used.
1070: (patch included)</a>
1.294 david 1071: <li><a href="errata27.html#telnetd">Oct 10, 2000:
1.149 millert 1072: The telnet daemon does not strip out the TERMINFO, TERMINFO_DIRS,
1073: TERMPATH and TERMCAP environment variables as it should.
1074: (patch included)</a>
1.294 david 1075: <li><a href="errata27.html#format_strings">Oct 6, 2000:
1.148 millert 1076: There are printf-style format string bugs in several privileged
1077: programs. (patch included)</a>
1.294 david 1078: <li><a href="errata27.html#curses">Oct 6, 2000:
1.147 millert 1079: libcurses honored terminal descriptions in the $HOME/.terminfo
1080: directory as well as in the TERMCAP environment variable for
1081: setuid and setgid applications.
1.146 deraadt 1082: (patch included)</a>
1.294 david 1083: <li><a href="errata27.html#talkd">Oct 6, 2000:
1.146 deraadt 1084: A format string vulnerability exists in talkd(8).
1085: (patch included)</a>
1.294 david 1086: <li><a href="errata27.html#pw_error">Oct 3, 2000:
1.145 aaron 1087: A format string vulnerability exists in the pw_error() function of the
1088: libutil library, yielding localhost root through chpass(1).
1089: (patch included)</a>
1.294 david 1090: <li><a href="errata27.html#ipsec">Sep 18, 2000:
1.144 jason 1091: Bad ESP/AH packets could cause a crash under certain conditions.
1092: (patch included)</a>
1.294 david 1093: <li><a href="errata27.html#xlock">Aug 16, 2000:
1.141 deraadt 1094: A format string vulnerability (localhost root) exists in xlock(1).
1095: (patch included)</a>
1.294 david 1096: <li><a href="errata27.html#X11_libs">July 14, 2000:
1.139 deraadt 1097: Various bugs found in X11 libraries have various side effects, almost
1098: completely denial of service in OpenBSD.
1099: (patch included)</a>
1.294 david 1100: <li><a href="errata27.html#ftpd">July 5, 2000:
1.136 deraadt 1101: Just like pretty much all the other unix ftp daemons
1102: on the planet, ftpd had a remote root hole in it.
1103: Luckily, ftpd was not enabled by default.
1.137 deraadt 1104: The problem exists if anonymous ftp is enabled.
1.136 deraadt 1105: (patch included)</a>
1.294 david 1106: <li><a href="errata27.html#mopd">July 5, 2000:
1.136 deraadt 1107: Mopd, very rarely used, contained some buffer overflows.
1108: (patch included)</a>
1.294 david 1109: <li><a href="errata27.html#libedit">June 28, 2000:
1.135 deraadt 1110: libedit would check for a <b>.editrc</b> file in the current
1111: directory. Not known to be a real security issue, but a patch
1112: is available anyways.
1113: (patch included)</a>
1.294 david 1114: <li><a href="errata27.html#dhclient">June 24, 2000:
1.134 deraadt 1115: A serious bug in dhclient(8) could allow strings from a
1116: malicious dhcp server to be executed in the shell as root.
1117: (patch included)</a>
1.294 david 1118: <li><a href="errata27.html#isakmpd">June 9, 2000:
1.133 deraadt 1119: A serious bug in isakmpd(8) policy handling wherein
1120: policy verification could be completely bypassed in isakmpd.
1121: (patch included)</a>
1.294 david 1122: <li><a href="errata27.html#uselogin">June 6, 2000:
1.132 deraadt 1123: The non-default flag UseLogin in <b>/etc/sshd_config</b> is broken,
1124: should not be used, and results in security problems on
1125: other operating systems.</a>
1.294 david 1126: <li><a href="errata27.html#bridge">May 26, 2000:
1.129 deraadt 1127: The bridge(4) <i>learning</i> flag may be bypassed.
1.128 deraadt 1128: (patch included)</a>
1.294 david 1129: <li><a href="errata27.html#ipf">May 25, 2000:
1.127 kjell 1130: Improper use of ipf <i>keep-state</i> rules can result
1131: in firewall rules being bypassed. (patch included)</a>
1132:
1.124 deraadt 1133: </ul>
1134:
1135: <p>
1136: <li>
1.288 matthieu 1137: <a name="26"></a>
1.119 deraadt 1138:
1.294 david 1139: <h3><font color="#e00000">OpenBSD 2.6 Security Advisories</font></h3>
1.119 deraadt 1140: These are the OpenBSD 2.6 advisories -- all these problems are solved
1.294 david 1141: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.119 deraadt 1142: OpenBSD 2.5 advisories listed below are fixed in OpenBSD 2.6.
1143:
1144: <p>
1145: <ul>
1.294 david 1146: <li><a href="errata26.html#semconfig">May 26, 2000:
1.130 deraadt 1147: SYSV semaphore support contained an undocumented system call
1.131 deraadt 1148: which could wedge semaphore-using processes from exiting. (patch included)</a>
1.294 david 1149: <li><a href="errata26.html#ipf">May 25, 2000:
1.127 kjell 1150: Improper use of ipf <i>keep-state</i> rules can result
1151: in firewall rules being bypassed. (patch included)</a>
1.294 david 1152: <li><a href="errata26.html#xlockmore">May 25, 2000:
1.125 deraadt 1153: xlockmore has a bug which a localhost attacker can use to gain
1154: access to the encrypted root password hash (which is normally
1.245 miod 1155: encoded using blowfish</a> (see
1.294 david 1156: <a href="http://www.openbsd.org/cgi-bin/man.cgi?query=crypt&sektion=3">
1.125 deraadt 1157: crypt(3)</a>)
1.245 miod 1158: (patch included).
1.294 david 1159: <li><a href="errata26.html#procfs">Jan 20, 2000:
1.123 deraadt 1160: Systems running with procfs enabled and mounted are
1161: vulnerable to a very tricky exploit. procfs is not
1162: mounted by default.
1163: (patch included).</a>
1.294 david 1164: <li><a href="errata26.html#sendmail">Dec 4, 1999:
1.296 david 1165: Sendmail permitted any user to cause an aliases file wrap,
1.190 mpech 1166: thus exposing the system to a race where the aliases file
1167: did not exist.
1.119 deraadt 1168: (patch included).</a>
1.294 david 1169: <li><a href="errata26.html#poll">Dec 4, 1999:
1.190 mpech 1170: Various bugs in poll(2) may cause a kernel crash.</a>
1.294 david 1171: <li><a href="errata26.html#sslUSA">Dec 2, 1999:
1.120 deraadt 1172: A buffer overflow in the RSAREF code included in the
1173: USA version of libssl, is possibly exploitable in
1174: httpd, ssh, or isakmpd, if SSL/RSA features are enabled.
1.124 deraadt 1175: (patch included).<br></a>
1176: <strong>Update:</strong> Turns out that this was not exploitable
1177: in any of the software included in OpenBSD 2.6.
1.294 david 1178: <li><a href="errata26.html#ifmedia">Nov 9, 1999:
1.190 mpech 1179: Any user could change interface media configurations, resulting in
1180: a localhost denial of service attack.
1.121 deraadt 1181: (patch included).</a>
1.119 deraadt 1182: </ul>
1183:
1184: <p>
1185: <li>
1.288 matthieu 1186: <a name="25"></a>
1.106 deraadt 1187:
1.294 david 1188: <h3><font color="#e00000">OpenBSD 2.5 Security Advisories</font></h3>
1.93 deraadt 1189: These are the OpenBSD 2.5 advisories -- all these problems are solved
1.294 david 1190: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.93 deraadt 1191: OpenBSD 2.4 advisories listed below are fixed in OpenBSD 2.5.
1192:
1.96 deraadt 1193: <p>
1.104 deraadt 1194: <ul>
1.294 david 1195: <li><a href="errata25.html#cron">Aug 30, 1999:
1.103 deraadt 1196: In cron(8), make sure argv[] is NULL terminated in the
1197: fake popen() and run sendmail as the user, not as root.
1198: (patch included).</a>
1.294 david 1199: <li><a href="errata25.html#miscfs">Aug 12, 1999: The procfs and fdescfs
1.101 deraadt 1200: filesystems had an overrun in their handling of uio_offset
1201: in their readdir() routines. (These filesystems are not
1202: enabled by default). (patch included).</a>
1.294 david 1203: <li><a href="errata25.html#profil">Aug 9, 1999: Stop profiling (see profil(2))
1.100 deraadt 1204: when we execve() a new process. (patch included).</a>
1.294 david 1205: <li><a href="errata25.html#ipsec_in_use">Aug 6, 1999: Packets that should have
1.98 deraadt 1206: been handled by IPsec may be transmitted as cleartext.
1207: PF_KEY SA expirations may leak kernel resources.
1208: (patch included).</a>
1.294 david 1209: <li><a href="errata25.html#rc">Aug 5, 1999: In /etc/rc, use mktemp(1) for
1.97 deraadt 1210: motd re-writing and change the find(1) to use -execdir
1211: (patch included).</a>
1.294 david 1212: <li><a href="errata25.html#chflags">Jul 30, 1999: Do not permit regular
1.95 deraadt 1213: users to chflags(2) or fchflags(2) on character or block devices
1214: which they may currently be the owner of (patch included).</a>
1.294 david 1215: <li><a href="errata25.html#nroff">Jul 27, 1999: Cause groff(1) to be invoked
1.95 deraadt 1216: with the -S flag, when called by nroff(1) (patch included).</a>
1.93 deraadt 1217: </ul>
1218:
1.106 deraadt 1219: <p>
1220: <li>
1.288 matthieu 1221: <a name="24"></a>
1.235 miod 1222:
1.294 david 1223: <h3><font color="#e00000">OpenBSD 2.4 Security Advisories</font></h3>
1.75 deraadt 1224: These are the OpenBSD 2.4 advisories -- all these problems are solved
1.294 david 1225: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.75 deraadt 1226: OpenBSD 2.3 advisories listed below are fixed in OpenBSD 2.4.
1227:
1.96 deraadt 1228: <p>
1.75 deraadt 1229: <ul>
1.294 david 1230: <li><a href="errata24.html#poll">Mar 22, 1999: The nfds argument for poll(2) needs
1.91 deraadt 1231: to be constrained, to avoid kvm starvation (patch included).</a>
1.294 david 1232: <li><a href="errata24.html#tss">Mar 21, 1999: A change in TSS handling stops
1.91 deraadt 1233: another kernel crash case caused by the <strong>crashme</strong>
1234: program (patch included).</a>
1.294 david 1235: <li><a href="errata24.html#nlink">Feb 25, 1999: An unbounded increment on the
1.90 deraadt 1236: nlink value in FFS and EXT2FS filesystems can cause a system crash.
1.89 deraadt 1237: (patch included).</a>
1.294 david 1238: <li><a href="errata24.html#ping">Feb 23, 1999: Yet another buffer overflow
1.88 deraadt 1239: existed in ping(8). (patch included).</a>
1.294 david 1240: <li><a href="errata24.html#ipqrace">Feb 19, 1999: ipintr() had a race in use of
1.87 deraadt 1241: the ipq, which could permit an attacker to cause a crash.
1242: (patch included).</a>
1.294 david 1243: <li><a href="errata24.html#accept">Feb 17, 1999: A race condition in the
1.86 deraadt 1244: kernel between accept(2) and select(2) could permit an attacker
1245: to hang sockets from remote.
1246: (patch included).</a>
1.294 david 1247: <li><a href="errata24.html#maxqueue">Feb 17, 1999: IP fragment assembly can
1.85 deraadt 1248: bog the machine excessively and cause problems.
1249: (patch included).</a>
1.294 david 1250: <li><a href="errata24.html#trctrap">Feb 12, 1999: i386 T_TRCTRAP handling and
1.84 deraadt 1251: DDB interacted to possibly cause a crash.
1252: (patch included).</a>
1.294 david 1253: <li><a href="errata24.html#rst">Feb 11, 1999: TCP/IP RST handling was sloppy.
1.83 deraadt 1254: (patch included).</a>
1.294 david 1255: <li><a href="errata24.html#bootpd">Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 1256: problem in bootpd(8). (patch included).</a>
1.294 david 1257: <li><a href="errata24.html#termcap">Nov 19, 1998: There is a possibly locally
1.82 deraadt 1258: exploitable problem relating to environment variables in termcap
1259: and curses. (patch included).</a>
1.294 david 1260: <li><a href="errata24.html#tcpfix">Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 1261: bug in the TCP decoding kernel. (patch included).</a>
1.75 deraadt 1262: </ul>
1263:
1.106 deraadt 1264: <p>
1265: <li>
1.288 matthieu 1266: <a name="23"></a>
1.235 miod 1267:
1.294 david 1268: <h3><font color="#e00000">OpenBSD 2.3 Security Advisories</font></h3>
1.73 deraadt 1269: These are the OpenBSD 2.3 advisories -- all these problems are solved
1.294 david 1270: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.73 deraadt 1271: OpenBSD 2.2 advisories listed below are fixed in OpenBSD 2.3.
1.53 matthieu 1272:
1.96 deraadt 1273: <p>
1.53 matthieu 1274: <ul>
1.294 david 1275: <li><a href="errata23.html#bootpd">Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 1276: problem in bootpd(8). (patch included).</a>
1.294 david 1277: <li><a href="errata23.html#tcpfix">Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 1278: bug in the TCP decoding kernel. (patch included).</a>
1.294 david 1279: <li><a href="errata23.html#resolver">August 31, 1998: A benign looking resolver
1.190 mpech 1280: buffer overflow bug was re-introduced accidentally (patches included).</a>
1.294 david 1281: <li><a href="errata23.html#chpass">Aug 2, 1998:
1.190 mpech 1282: chpass(1) has a file descriptor leak which allows an
1283: attacker to modify /etc/master.passwd.</a>
1.294 david 1284: <li><a href="errata23.html#inetd">July 15, 1998: Inetd had a file descriptor leak.</a>
1285: <li><a href="errata23.html#fdalloc">Jul 2, 1998: setuid and setgid processes
1.72 deraadt 1286: should not be executed with fd slots 0, 1, or 2 free.
1287: (patch included).</a>
1.294 david 1288: <li><a href="errata23.html#xlib">June 6, 1998: Further problems with the X
1.71 deraadt 1289: libraries (patches included).</a>
1.294 david 1290: <li><a href="errata23.html#kill">May 17, 1998: kill(2) of setuid/setgid target
1.66 deraadt 1291: processes too permissive (4th revision patch included).</a>
1.294 david 1292: <li><a href="errata23.html#immutable">May 11, 1998: mmap() permits partial bypassing
1.60 deraadt 1293: of immutable and append-only file flags. (patch included).</a>
1.294 david 1294: <li><a href="errata23.html#ipsec">May 5, 1998: Incorrect handling of IPSEC packets
1.190 mpech 1295: if IPSEC is enabled (patch included).</a>
1.294 david 1296: <li><a href="errata23.html#xterm-xaw">May 1, 1998: Buffer overflow in xterm and Xaw
1.58 deraadt 1297: (CERT advisory VB-98.04) (patch included).</a>
1.53 matthieu 1298: </ul>
1.9 deraadt 1299:
1.106 deraadt 1300: <p>
1301: <li>
1.288 matthieu 1302: <a name="22"></a>
1.235 miod 1303:
1.294 david 1304: <h3><font color="#e00000">OpenBSD 2.2 Security Advisories</font></h3>
1.45 deraadt 1305: These are the OpenBSD 2.2 advisories. All these problems are solved
1.294 david 1306: in <a href="23.html">OpenBSD 2.3</a>. Some of these problems
1.45 deraadt 1307: still exist in other operating systems. (The supplied patches are for
1308: OpenBSD 2.2; they may or may not work on OpenBSD 2.1).
1.9 deraadt 1309:
1.96 deraadt 1310: <p>
1.9 deraadt 1311: <ul>
1.294 david 1312: <li><a href="errata22.html#ipsec">May 5, 1998: Incorrect handling of IPSEC
1.72 deraadt 1313: packets if IPSEC is enabled (patch included).</a>
1.294 david 1314: <li><a href="errata22.html#xterm-xaw">May 1, 1998: Buffer overflow in xterm
1.72 deraadt 1315: and Xaw (CERT advisory VB-98.04) (patch included).</a>
1.294 david 1316: <li><a href="errata22.html#uucpd">Apr 22, 1998: Buffer overflow in uucpd
1.72 deraadt 1317: (patch included).</a>
1.294 david 1318: <li><a href="errata22.html#rmjob">Apr 22, 1998: Buffer mismanagement in lprm
1.72 deraadt 1319: (patch included).</a>
1.294 david 1320: <li><a href="errata22.html#ping">Mar 31, 1998: Overflow in ping -R (patch included).</a>
1321: <li><a href="errata22.html#named">Mar 30, 1998: Overflow in named fake-iquery
1.59 deraadt 1322: (patch included).</a>
1.294 david 1323: <li><a href="errata22.html#mountd">Mar 2, 1998: Accidental NFS filesystem
1.72 deraadt 1324: export (patch included).</a>
1.112 philen 1325: <li><a href="advisories/mmap.txt">Feb 26, 1998: Read-write mmap() flaw.</a>
1.294 david 1326: Revision 3 of the patch is available <a href="errata22.html#mmap">here</a>
1.112 philen 1327: <li><a href="advisories/sourceroute.txt">Feb 19, 1998: Sourcerouted Packet
1.59 deraadt 1328: Acceptance.</a>
1.294 david 1329: A patch is available <a href="errata22.html#sourceroute">here</a>.
1330: <li><a href="errata22.html#ruserok">Feb 13, 1998: Setuid coredump & Ruserok()
1.72 deraadt 1331: flaw (patch included).</a>
1.294 david 1332: <li><a href="errata22.html#ldso">Feb 9, 1998: MIPS ld.so flaw (patch included).</a>
1.1 deraadt 1333: </ul>
1334:
1.106 deraadt 1335: <p>
1336: <li>
1.288 matthieu 1337: <a name="21"></a>
1.235 miod 1338:
1.294 david 1339: <h3><font color="#e00000">OpenBSD 2.1 Security Advisories</font></h3>
1.52 deraadt 1340: These are the OpenBSD 2.1 advisories. All these problems are solved
1.294 david 1341: in <a href="22.html">OpenBSD 2.2</a>. Some of these problems still
1.52 deraadt 1342: exist in other operating systems. (If you are running OpenBSD 2.1, we
1343: would strongly recommend an upgrade to the newest release, as this
1344: patch list only attempts at fixing the most important security
1345: problems. In particular, OpenBSD 2.2 fixes numerous localhost
1346: security problems. Many of those problems were solved in ways which
1347: make it hard for us to provide patches).
1348:
1.96 deraadt 1349: <p>
1.52 deraadt 1350: <ul>
1.112 philen 1351: <li><a href="advisories/signals.txt">Sep 15, 1997: Deviant Signals (patch included)</a>
1352: <li><a href="advisories/rfork.txt">Aug 2, 1997: Rfork() system call flaw
1.59 deraadt 1353: (patch included)</a>
1.112 philen 1354: <li><a href="advisories/procfs.txt">Jun 24, 1997: Procfs flaws (patch included)</a>
1.52 deraadt 1355: </ul>
1.51 deraadt 1356:
1.106 deraadt 1357: <p>
1358: <li>
1.288 matthieu 1359: <a name="20"></a>
1.235 miod 1360:
1.294 david 1361: <h3><font color="#e00000">OpenBSD 2.0 Security Advisories</font></h3>
1.99 deraadt 1362: These are the OpenBSD 2.0 advisories. All these problems are solved
1.294 david 1363: in <a href="21.html">OpenBSD 2.1</a>. Some of these problems still
1.99 deraadt 1364: exist in other operating systems. (If you are running OpenBSD 2.0, we
1365: commend you for being there back in the old days!, but you're really
1366: missing out if you don't install a new version!)
1367:
1368: <p>
1369: <ul>
1.112 philen 1370: <li><a href="advisories/res_random.txt">April 22, 1997: Predictable IDs in the
1.99 deraadt 1371: resolver (patch included)</a>
1372: <li>Many others... if people can hunt them down, please let me know
1373: and we'll put them up here.
1374: </ul>
1.51 deraadt 1375: <p>
1.106 deraadt 1376:
1.288 matthieu 1377: <a name="watching"></a>
1.294 david 1378: <li><h3><font color="#e00000">Watching our Changes</font></h3><p>
1.106 deraadt 1379:
1.21 deraadt 1380: Since we take a proactive stance with security, we are continually
1381: finding and fixing new security problems. Not all of these problems
1.80 espie 1382: get widely reported because (as stated earlier) many of them are not
1.45 deraadt 1383: confirmed to be exploitable; many simple bugs we fix do turn out to
1384: have security consequences we could not predict. We do not have the
1385: time resources to make these changes available in the above format.<p>
1.21 deraadt 1386:
1387: Thus there are usually minor security fixes in the current source code
1388: beyond the previous major OpenBSD release. We make a limited
1.45 deraadt 1389: guarantee that these problems are of minimal impact and unproven
1.44 ian 1390: exploitability. If we discover that a problem definitely matters for
1.45 deraadt 1391: security, patches will show up here <strong>VERY</strong> quickly.<p>
1.21 deraadt 1392:
1.45 deraadt 1393: People who are really concerned with security can do a number of
1394: things:<p>
1.21 deraadt 1395:
1396: <ul>
1397: <li>If you understand security issues, watch our
1.294 david 1398: <a href="mail.html">source-changes mailing list</a> and keep an
1.23 deraadt 1399: eye out for things which appear security related. Since
1.21 deraadt 1400: exploitability is not proven for many of the fixes we make,
1401: do not expect the relevant commit message to say "SECURITY FIX!".
1402: If a problem is proven and serious, a patch will be available
1403: here very shortly after.
1.161 horacio 1404: <li>In addition to source changes, you can watch our <a href="mail.html">
1.160 ericj 1405: security-announce mailing list</a> which will notify you for every
1.186 ian 1406: security related item that the OpenBSD team deems as a possible threat,
1.160 ericj 1407: and instruct you on how to patch the problem.
1.21 deraadt 1408: <li>Track our current source code tree, and teach yourself how to do a
1.29 deraadt 1409: complete system build from time to time (read /usr/src/Makefile
1410: carefully). Users can make the assumption that the current
1411: source tree always has stronger security than the previous release.
1.45 deraadt 1412: However, building your own system from source code is not trivial;
1.265 miod 1413: it is nearly 600MB of source code, and problems do occur as we
1.45 deraadt 1414: transition between major releases.
1.115 ericj 1415: <li>Install a binary snapshot for your
1.80 espie 1416: architecture, which are made available fairly often. For
1.29 deraadt 1417: instance, an i386 snapshot is typically made available weekly.
1.21 deraadt 1418: </ul>
1419:
1.9 deraadt 1420: <p>
1.288 matthieu 1421: <a name="reporting"></a>
1.294 david 1422: <li><h3><font color="#e00000">Reporting problems</font></h3><p>
1.3 deraadt 1423:
1.5 deraadt 1424: <p> If you find a new security problem, you can mail it to
1.294 david 1425: <a href="mailto:deraadt@openbsd.org">deraadt@openbsd.org</a>.
1.7 deraadt 1426: <br>
1.5 deraadt 1427: If you wish to PGP encode it (but please only do so if privacy is very
1.112 philen 1428: urgent, since it is inconvenient) use this <a href="advisories/pgpkey.txt">pgp key</a>.
1.5 deraadt 1429:
1.107 deraadt 1430: <p>
1.288 matthieu 1431: <a name="papers"></a>
1.294 david 1432: <li><h3><font color="#e00000">Further Reading</font></h3><p>
1.107 deraadt 1433:
1434: A number of papers have been written by OpenBSD team members, about security
1435: related changes they have done in OpenBSD. The postscript versions of these
1.108 deraadt 1436: documents are available as follows.<p>
1.107 deraadt 1437:
1438: <ul>
1.113 deraadt 1439: <li>A Future-Adaptable Password Scheme.<br>
1.294 david 1440: <a href="events.html#usenix99">Usenix 1999</a>,
1441: by <a href="mailto:provos@openbsd.org">Niels Provos</a>,
1442: <a href="mailto:dm@openbsd.org">David Mazieres</a>.<br>
1443: <a href="papers/bcrypt-paper.ps">paper</a> and
1444: <a href="papers/bcrypt-slides.ps">slides</a>.
1.113 deraadt 1445: <p>
1446: <li>Cryptography in OpenBSD: An Overview.<br>
1.294 david 1447: <a href="events.html#usenix99">Usenix 1999</a>,
1448: by <a href="mailto:deraadt@openbsd.org">Theo de Raadt</a>,
1449: <a href="mailto:niklas@openbsd.org">Niklas Hallqvist</a>,
1450: <a href="mailto:art@openbsd.org">Artur Grabowski</a>,
1451: <a href="mailto:angelos@openbsd.org">Angelos D. Keromytis</a>,
1452: <a href="mailto:provos@openbsd.org">Niels Provos</a>.<br>
1453: <a href="papers/crypt-paper.ps">paper</a> and
1454: <a href="papers/crypt-slides.ps">slides</a>.
1.113 deraadt 1455: <p>
1456: <li>strlcpy and strlcat -- consistent, safe, string copy and concatenation.<br>
1.294 david 1457: <a href="events.html#usenix99">Usenix 1999</a>,
1458: by <a href="mailto:millert@openbsd.org">Todd C. Miller</a>,
1459: <a href="mailto:deraadt@openbsd.org">Theo de Raadt</a>.<br>
1460: <a href="papers/strlcpy-paper.ps">paper</a> and
1461: <a href="papers/strlcpy-slides.ps">slides</a>.
1.113 deraadt 1462: <p>
1.118 deraadt 1463: <li>Dealing with Public Ethernet Jacks-Switches, Gateways, and Authentication.<br>
1.294 david 1464: <a href="events.html#lisa99">LISA 1999</a>,
1465: by <a href="mailto:beck@openbsd.org">Bob Beck</a>.<br>
1466: <a href="papers/authgw-paper.ps">paper</a> and
1467: <a href="papers/authgw-slides.ps">slides</a>.
1.118 deraadt 1468: <p>
1.153 jufi 1469: <li>Encrypting Virtual Memory<br>
1.294 david 1470: <a href="events.html#sec2000">Usenix Security 2000</a>,
1471: <a href="mailto:provos@openbsd.org">Niels Provos</a>.<br>
1472: <a href="papers/swapencrypt.ps">paper</a> and
1473: <a href="papers/swapencrypt-slides.ps">slides</a>.
1.142 deraadt 1474: <p>
1.107 deraadt 1475: </ul>
1.294 david 1476: </ul>
1.106 deraadt 1477:
1.2 deraadt 1478: <hr>
1.294 david 1479: <a href="index.html"><img height=24 width=24 src="back.gif" border=0 alt="OpenBSD"></a>
1480: <a href="mailto:www@openbsd.org">www@openbsd.org</a>
1.24 deraadt 1481: <br>
1.328 ! brad 1482: <small>$OpenBSD: security.html,v 1.327 2006/09/02 23:58:06 brad Exp $</small>
1.1 deraadt 1483:
1.24 deraadt 1484: </body>
1485: </html>
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