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1.106 deraadt 17: <p>
1.294 david 18: <h2><font color="#e00000">Security</font></h2>
19: <hr>
1.1 deraadt 20:
1.114 philen 21: <table width="100%">
22: <tr>
23: <td colspan="2">
24: <strong>Index</strong>
25: </td>
26: </tr>
27: <tr>
28: <td valign="top">
1.294 david 29: <a href="#goals">Security goals of the Project</a>.<br>
30: <a href="#disclosure">Full Disclosure policy</a>.<br>
31: <a href="#process">Source code auditing process</a>.<br>
32: <a href="#default">"Secure by Default"</a>.<br>
33: <a href="#crypto">Use of Cryptography</a>.<br>
34: <p>
35: <a href="#watching">Watching changes</a>.<br>
36: <a href="#reporting">Reporting security issues</a>.<br>
37: <a href="#papers">Further Reading</a><br>
1.106 deraadt 38: <p>
1.114 philen 39: </td>
40: <td valign="top">
1.225 deraadt 41: For security advisories for specific releases, click below:<br>
42: <a href="#20">2.0</a>,
43: <a href="#21">2.1</a>,
44: <a href="#22">2.2</a>,
45: <a href="#23">2.3</a>,
46: <a href="#24">2.4</a>,
47: <a href="#25">2.5</a>,
48: <a href="#26">2.6</a>,
49: <a href="#27">2.7</a>,
50: <a href="#28">2.8</a>,
51: <a href="#29">2.9</a>,
52: <a href="#30">3.0</a>,
53: <a href="#31">3.1</a>,
1.246 deraadt 54: <a href="#32">3.2</a>,
1.261 david 55: <a href="#33">3.3</a>,
1.280 david 56: <a href="#34">3.4</a>,
1.301 miod 57: <a href="#35">3.5</a>,
1.312 david 58: <a href="#36">3.6</a>,
1.318 deraadt 59: <a href="#37">3.7</a>,
1.321 brad 60: <a href="#38">3.8</a>,
1.334 brad 61: <a href="#39">3.9</a>,
62: <a href="#40">4.0</a>.
1.114 philen 63: </td>
64: </tr>
65: </table>
1.56 deraadt 66: <hr>
67:
1.294 david 68: <a name="goals"></a>
1.278 deraadt 69: <ul>
1.294 david 70: <li><h3><font color="#e00000">Goal</font></h3><p>
1.22 deraadt 71:
1.14 deraadt 72: OpenBSD believes in strong security. Our aspiration is to be NUMBER
1.22 deraadt 73: ONE in the industry for security (if we are not already there). Our
74: open software development model permits us to take a more
75: uncompromising view towards increased security than Sun, SGI, IBM, HP,
76: or other vendors are able to. We can make changes the vendors would
1.27 deraadt 77: not make. Also, since OpenBSD is exported with <a href=crypto.html>
1.45 deraadt 78: cryptography</a>, we are able to take cryptographic approaches towards
79: fixing security problems.<p>
1.18 deraadt 80:
1.288 matthieu 81: <a name="disclosure"></a>
1.294 david 82: <li><h3><font color="#e00000">Full Disclosure</font></h3><p>
1.106 deraadt 83:
1.45 deraadt 84: Like many readers of the
1.196 jufi 85: <a href="http://online.securityfocus.com/archive/1">
1.18 deraadt 86: BUGTRAQ mailing list</a>,
1.106 deraadt 87: we believe in full disclosure of security problems. In the
88: operating system arena, we were probably the first to embrace
89: the concept. Many vendors, even of free software, still try
90: to hide issues from their users.<p>
91:
92: Security information moves very fast in cracker circles. On the other
93: hand, our experience is that coding and releasing of proper security
94: fixes typically requires about an hour of work -- very fast fix
95: turnaround is possible. Thus we think that full disclosure helps the
96: people who really care about security.<p>
97:
1.288 matthieu 98: <a name="process"></a>
1.294 david 99: <li><h3><font color="#e00000">Audit Process</font></h3><p>
1.15 deraadt 100:
1.12 deraadt 101: Our security auditing team typically has between six and twelve
1.45 deraadt 102: members who continue to search for and fix new security holes. We
103: have been auditing since the summer of 1996. The process we follow to
104: increase security is simply a comprehensive file-by-file analysis of
1.106 deraadt 105: every critical software component. We are not so much looking for
106: security holes, as we are looking for basic software bugs, and if
1.138 deraadt 107: years later someone discovers the problem used to be a security
1.106 deraadt 108: issue, and we fixed it because it was just a bug, well, all the
109: better. Flaws have been found in just about every area of the system.
110: Entire new classes of security problems have been found during our
111: audit, and often source code which had been audited earlier needs
112: re-auditing with these new flaws in mind. Code often gets audited
113: multiple times, and by multiple people with different auditing
114: skills.<p>
1.12 deraadt 115:
1.94 deraadt 116: Some members of our security auditing team worked for Secure Networks,
117: the company that made the industry's premier network security scanning
118: software package Ballista (Secure Networks got purchased by Network
119: Associates, Ballista got renamed to Cybercop Scanner, and well...)
120: That company did a lot of security research, and thus fit in well
1.106 deraadt 121: with the OpenBSD stance. OpenBSD passed Ballista's tests with flying
122: colours since day 1.<p>
1.31 deraadt 123:
1.34 deraadt 124: Another facet of our security auditing process is its proactiveness.
1.45 deraadt 125: In most cases we have found that the determination of exploitability
126: is not an issue. During our ongoing auditing process we find many
127: bugs, and endeavor to fix them even though exploitability is not
128: proven. We fix the bug, and we move on to find other bugs to fix. We
129: have fixed many simple and obvious careless programming errors in code
130: and only months later discovered that the problems were in fact
131: exploitable. (Or, more likely someone on
1.197 jufi 132: <a href="http://online.securityfocus.com/archive/1">BUGTRAQ</a>
1.45 deraadt 133: would report that other operating systems were vulnerable to a `newly
134: discovered problem', and then it would be discovered that OpenBSD had
135: been fixed in a previous release). In other cases we have been saved
136: from full exploitability of complex step-by-step attacks because we
137: had fixed one of the intermediate steps. An example of where we
1.94 deraadt 138: managed such a success is the lpd advisory that Secure Networks put out.
139: <p>
1.29 deraadt 140:
1.288 matthieu 141: <a name="newtech"></a>
1.294 david 142: <li><h3><font color="#e00000">New Technologies</font></h3><p>
1.278 deraadt 143:
144: As we audit source code, we often invent new ways of solving problems.
145: Sometimes these ideas have been used before in some random application
146: written somewhere, but perhaps not taken to the degree that we do.
147: <p>
148:
149: <ul>
150: <li>strlcpy() and strlcat()
151: <li>Memory protection purify
152: <ul>
153: <li>W^X
154: <li>.rodata segment
155: <li>Guard pages
156: <li>Randomized malloc()
157: <li>Randomized mmap()
158: <li>atexit() and stdio protection
159: </ul>
1.295 otto 160: <li>Privilege separation
1.278 deraadt 161: <li>Privilege revocation
162: <li>Chroot jailing
163: <li>New uids
164: <li>ProPolice
165: <li>... and others
166: </ul>
167: <p>
168:
1.294 david 169: <li><h3><font color="#e00000">The Reward</font></h3><p>
1.106 deraadt 170:
1.45 deraadt 171: Our proactive auditing process has really paid off. Statements like
1.35 deraadt 172: ``This problem was fixed in OpenBSD about 6 months ago'' have become
1.45 deraadt 173: commonplace in security forums like
1.197 jufi 174: <a href="http://online.securityfocus.com/archive/1">BUGTRAQ</a>.<p>
1.35 deraadt 175:
1.45 deraadt 176: The most intense part of our security auditing happened immediately
1.80 espie 177: before the OpenBSD 2.0 release and during the 2.0->2.1 transition,
1.45 deraadt 178: over the last third of 1996 and first half of 1997. Thousands (yes,
179: thousands) of security issues were fixed rapidly over this year-long
180: period; bugs like the standard buffer overflows, protocol
181: implementation weaknesses, information gathering, and filesystem
182: races. Hence most of the security problems that we encountered were
183: fixed before our 2.1 release, and then a far smaller number needed
184: fixing for our 2.2 release. We do not find as many problems anymore,
185: it is simply a case of diminishing returns. Recently the security
186: problems we find and fix tend to be significantly more obscure or
187: complicated. Still we will persist for a number of reasons:<p>
1.36 deraadt 188:
1.35 deraadt 189: <ul>
1.45 deraadt 190: <li>Occasionally we find a simple problem we missed earlier. Doh!
1.35 deraadt 191: <li>Security is like an arms race; the best attackers will continue
1.45 deraadt 192: to search for more complicated exploits, so we will too.
193: <li>Finding and fixing subtle flaws in complicated software is
194: a lot of fun.
1.35 deraadt 195: </ul>
1.106 deraadt 196: <p>
1.15 deraadt 197:
1.14 deraadt 198: The auditing process is not over yet, and as you can see we continue
1.28 deraadt 199: to find and fix new security flaws.<p>
1.12 deraadt 200:
1.288 matthieu 201: <a name="default"></a>
1.294 david 202: <li><h3><font color="#e00000">"Secure by Default"</font></h3><p>
1.106 deraadt 203:
204: To ensure that novice users of OpenBSD do not need to become security
205: experts overnight (a viewpoint which other vendors seem to have), we
206: ship the operating system in a Secure by Default mode. All non-essential
207: services are disabled. As the user/administrator becomes more familiar
208: with the system, he will discover that he has to enable daemons and other
209: parts of the system. During the process of learning how to enable a new
210: service, the novice is more likely to learn of security considerations.<p>
211:
212: This is in stark contrast to the increasing number of systems that
213: ship with NFS, mountd, web servers, and various other services enabled
214: by default, creating instantaneous security problems for their users
215: within minutes after their first install.<p>
216:
1.288 matthieu 217: <a name="crypto"></a>
1.294 david 218: <li><h3><font color="#e00000">Cryptography</font></h3><p>
1.106 deraadt 219:
220: And of course, since the OpenBSD project is based in Canada, it is possible
221: for us to integrate cryptography. For more information, read the page
1.116 deraadt 222: outlining <a href=crypto.html>what we have done with cryptography</a>.</p>
1.106 deraadt 223:
1.294 david 224: <li><h3><font color="#e00000">Advisories</font></h3><p>
1.106 deraadt 225:
226: <li>
1.334 brad 227: <a name="40"></a>
228:
229: <h3><font color="#e00000">OpenBSD 4.0 Security Advisories</font></h3>
230: These are the OpenBSD 4.0 advisories -- all these problems are solved
231: in <a href=anoncvs.html>OpenBSD current</a> and the
232: <a href=stable.html>patch branch</a>.
233:
234: <p>
235: <ul>
1.335 ! deraadt 236: <li><a href="errata.html#systrace">Nov 4, 2006:
1.334 brad 237: Fix for an integer overflow in systrace(4)'s STRIOCREPLACE support,
238: found by Chris Evans.</a>
1.335 ! deraadt 239: <li><a href="errata.html#openssl">Nov 4, 2006:
1.334 brad 240: Several problems have been found in OpenSSL.</a>
1.335 ! deraadt 241: <li><a href="errata.html#httpd">Nov 4, 2006:
1.334 brad 242: httpd(8) does not sanitize the Expect header from an HTTP request
243: when it is reflected back in an error message, which might allow
244: cross-site scripting (XSS) style attacks.</a>
245: </ul>
246:
247: <li>
1.321 brad 248: <a name="39"></a>
249:
250: <h3><font color="#e00000">OpenBSD 3.9 Security Advisories</font></h3>
251: These are the OpenBSD 3.9 advisories -- all these problems are solved
252: in <a href=anoncvs.html>OpenBSD current</a> and the
253: <a href=stable.html>patch branch</a>.
254:
255: <p>
256: <ul>
1.333 deraadt 257: <li><a href="errata39.html#ssh">Oct 12, 2006:
1.332 brad 258: Fix 2 security bugs found in OpenSSH.</a>
1.333 deraadt 259: <li><a href="errata39.html#systrace">Oct 7, 2006:
1.331 brad 260: Fix for an integer overflow in systrace(4)'s STRIOCREPLACE support,
1.330 brad 261: found by Chris Evans.</a>
1.333 deraadt 262: <li><a href="errata39.html#openssl2">Oct 7, 2006:
1.330 brad 263: Several problems have been found in OpenSSL.</a>
1.333 deraadt 264: <li><a href="errata39.html#httpd2">Oct 7, 2006:
1.330 brad 265: httpd(8) does not sanitize the Expect header from an HTTP request
266: when it is reflected back in an error message, which might allow
267: cross-site scripting (XSS) style attacks.</a>
1.333 deraadt 268: <li><a href="errata39.html#openssl">Sep 8, 2006:
1.329 brad 269: Due to incorrect PKCS#1 v1.5 padding validation in OpenSSL, it is
270: possible for an attacker to construct an invalid signature which
271: OpenSSL would accept as a valid PKCS#1 v1.5 signature.</a>
1.333 deraadt 272: <li><a href="errata39.html#bind">Sep 8, 2006:
1.328 brad 273: Two Denial of Service issues have been found with BIND.</a>
1.333 deraadt 274: <li><a href="errata39.html#sppp">Sep 2, 2006:
1.327 brad 275: Due to the failure to correctly validate LCP configuration option
276: lengths, it is possible for an attacker to send LCP packets via an
277: sppp(4) connection causing the kernel to panic.</a>
1.333 deraadt 278: <li><a href="errata39.html#isakmpd">Aug 25, 2006:
1.326 brad 279: A problem in isakmpd(8) caused IPsec to run partly without replay
280: protection.</a>
1.333 deraadt 281: <li><a href="errata39.html#sem">Aug 25, 2006:
1.326 brad 282: It is possible to cause the kernel to panic when more than the default
283: number of sempahores have been allocated.</a>
1.333 deraadt 284: <li><a href="errata39.html#dhcpd">Aug 25, 2006:
1.326 brad 285: Due to an off-by-one error in dhcpd(8) it is possible to cause dhcpd(8)
286: to exit by sending a DHCPDISCOVER packet with a 32-byte client identifier
287: option.</a>
1.333 deraadt 288: <li><a href="errata39.html#sendmail3">Aug 25, 2006:
1.326 brad 289: A potential denial of service problem has been found in sendmail.</a>
1.333 deraadt 290: <li><a href="errata39.html#httpd">Jul 30, 2006:
1.325 brad 291: httpd(8)'s mod_rewrite has a potentially exploitable off-by-one buffer
292: overflow.</a>
1.333 deraadt 293: <li><a href="errata39.html#sendmail2">Jun 15, 2006:
1.324 brad 294: A potential denial of service problem has been found in sendmail.</a>
1.333 deraadt 295: <li><a href="errata39.html#xorg">May 2, 2006:
1.322 brad 296: A buffer overflow exists in the Render extension of the X server.</a>
1.333 deraadt 297: <li><a href="errata39.html#sendmail">Mar 25, 2006:
1.321 brad 298: A race condition has been reported to exist in the handling by sendmail
299: of asynchronous signals.</a>
300: </ul>
301:
302: <li>
1.318 deraadt 303: <a name="38"></a>
304:
305: <h3><font color="#e00000">OpenBSD 3.8 Security Advisories</font></h3>
306: These are the OpenBSD 3.8 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>
311: <ul>
1.332 brad 312: <li><a href="errata38.html#ssh2">Oct 12, 2006:
313: Fix 2 security bugs found in OpenSSH.</a>
1.330 brad 314: <li><a href="errata38.html#systrace">Oct 7, 2006:
1.331 brad 315: Fix for an integer overflow in systrace(4)'s STRIOCREPLACE support,
1.330 brad 316: found by Chris Evans.</a>
317: <li><a href="errata38.html#openssl2">Oct 7, 2006:
318: Several problems have been found in OpenSSL.</a>
319: <li><a href="errata38.html#httpd2">Oct 7, 2006:
320: httpd(8) does not sanitize the Expect header from an HTTP request
321: when it is reflected back in an error message, which might allow
322: cross-site scripting (XSS) style attacks.</a>
1.329 brad 323: <li><a href="errata38.html#openssl">Sep 8, 2006:
324: Due to incorrect PKCS#1 v1.5 padding validation in OpenSSL, it is
325: possible for an attacker to construct an invalid signature which
326: OpenSSL would accept as a valid PKCS#1 v1.5 signature.</a>
1.328 brad 327: <li><a href="errata38.html#bind">Sep 8, 2006:
328: Two Denial of Service issues have been found with BIND.</a>
1.327 brad 329: <li><a href="errata38.html#sppp">Sep 2, 2006:
330: Due to the failure to correctly validate LCP configuration option
331: lengths, it is possible for an attacker to send LCP packets via an
332: sppp(4) connection causing the kernel to panic.</a>
1.326 brad 333: <li><a href="errata38.html#isakmpd">Aug 25, 2006:
334: A problem in isakmpd(8) caused IPsec to run partly without replay
335: protection.</a>
336: <li><a href="errata38.html#sem">Aug 25, 2006:
337: It is possible to cause the kernel to panic when more than the default
338: number of sempahores have been allocated.</a>
339: <li><a href="errata38.html#dhcpd">Aug 25, 2006:
340: Due to an off-by-one error in dhcpd(8) it is possible to cause dhcpd(8)
341: to exit by sending a DHCPDISCOVER packet with a 32-byte client identifier
342: option.</a>
343: <li><a href="errata38.html#sendmail3">Aug 25, 2006:
344: A potential denial of service problem has been found in sendmail.</a>
1.325 brad 345: <li><a href="errata38.html#httpd">Jul 30, 2006:
346: httpd(8)'s mod_rewrite has a potentially exploitable off-by-one buffer
347: overflow.</a>
1.324 brad 348: <li><a href="errata38.html#sendmail2">Jun 15, 2006:
349: A potential denial of service problem has been found in sendmail.</a>
1.322 brad 350: <li><a href="errata38.html#xorg">May 2, 2006:
351: A buffer overflow exists in the Render extension of the X server.</a>
1.321 brad 352: <li><a href="errata38.html#sendmail">Mar 25, 2006:
353: A race condition has been reported to exist in the handling by sendmail
354: of asynchronous signals.</a>
355: <li><a href="errata38.html#ssh">Feb 12, 2006:
1.320 brad 356: Josh Bressers has reported a weakness in OpenSSH caused due to the
357: insecure use of the system(3) function in scp(1) when performing copy
358: operations using filenames that are supplied by the user from the
359: command line.</a>
1.321 brad 360: <li><a href="errata38.html#fd">Jan 5, 2006:
1.319 brad 361: Do not allow users to trick suid programs into re-opening files via
362: /dev/fd.</a>
1.321 brad 363: <li><a href="errata38.html#perl">Jan 5, 2006:
1.319 brad 364: A buffer overflow has been found in the Perl interpreter with the
365: sprintf function which may be exploitable under certain conditions.</a>
1.318 deraadt 366: </ul>
367:
1.323 steven 368: <p>
369: OpenBSD 3.7 and earlier releases are not supported anymore. The following
370: paragraphs only list advisories issued while they were maintained; these
371: releases are likely to be affected by the advisories for more recent releases.
372: <br>
373:
1.318 deraadt 374: <li>
1.312 david 375: <a name="37"></a>
376:
377: <h3><font color="#e00000">OpenBSD 3.7 Security Advisories</font></h3>
378: These are the OpenBSD 3.7 advisories -- all these problems are solved
1.323 steven 379: in <a href="anoncvs.html">OpenBSD current</a>. The
380: <a href="stable.html">patch branch</a> for 3.7 is no longer being maintained,
381: you should update your machine.
1.312 david 382:
383: <p>
384: <ul>
1.322 brad 385: <li><a href="errata37.html#xorg">May 2, 2006:
386: A buffer overflow exists in the Render extension of the X server.</a>
1.321 brad 387: <li><a href="errata37.html#sendmail">Mar 25, 2006:
388: A race condition has been reported to exist in the handling by sendmail
389: of asynchronous signals.</a>
1.320 brad 390: <li><a href="errata37.html#ssh">Feb 12, 2006:
391: Josh Bressers has reported a weakness in OpenSSH caused due to the
392: insecure use of the system(3) function in scp(1) when performing copy
393: operations using filenames that are supplied by the user from the
394: command line.</a>
1.319 brad 395: <li><a href="errata37.html#fd">Jan 5, 2006:
396: Do not allow users to trick suid programs into re-opening files via
397: /dev/fd.</a>
398: <li><a href="errata37.html#perl">Jan 5, 2006:
399: A buffer overflow has been found in the Perl interpreter with the
400: sprintf function which may be exploitable under certain conditions.</a>
1.318 deraadt 401: <li><a href="errata37.html#libz2">Jul 21, 2005:
1.317 millert 402: Fix another buffer overflow in the zlib library that may be exploitable.</a>
1.318 deraadt 403: <li><a href="errata37.html#libz">Jul 6, 2005:
1.316 millert 404: Fix a buffer overflow in the zlib library that may be exploitable.</a>
1.318 deraadt 405: <li><a href="errata37.html#sudo">Jun 20, 2005:
1.316 millert 406: Fix a race condition in sudo(8) that could allow a user
1.315 millert 407: to run arbitrary commands.</a>
1.318 deraadt 408: <li><a href="errata37.html#cvs">Jun 7, 2005:
1.313 brad 409: Fix a buffer overflow, memory leaks, and NULL pointer
410: dereference in cvs(1).</a>
1.312 david 411: </ul>
412:
413: <li>
1.301 miod 414: <a name="36"></a>
415:
416: <h3><font color="#e00000">OpenBSD 3.6 Security Advisories</font></h3>
417: These are the OpenBSD 3.6 advisories -- all these problems are solved
1.323 steven 418: in <a href="anoncvs.html">OpenBSD current</a>. The
419: <a href="stable.html">patch branch</a> for 3.6 is no longer being maintained,
420: you should update your machine.
1.301 miod 421:
422: <p>
1.302 markus 423: <ul>
1.317 millert 424: <li><a href="errata36.html#libz2">Jul 21, 2005:
425: Fix another buffer overflow in the zlib library that may be exploitable.</a>
1.316 millert 426: <li><a href="errata36.html#libz">Jul 6, 2005:
427: Fix a buffer overflow in the zlib library that may be exploitable.</a>
1.315 millert 428: <li><a href="errata36.html#sudo">Jun 20, 2005:
1.316 millert 429: Fix a race condition in sudo(8) that could allow a user
1.315 millert 430: to run arbitrary commands.</a>
1.311 deraadt 431: <li><a href="errata36.html#cvs">Apr 28, 2005:
1.310 brad 432: Fix a buffer overflow, memory leaks, and NULL pointer
433: dereference in cvs(1).</a>
1.311 deraadt 434: <li><a href="errata36.html#telnet">Mar 30, 2005:
1.309 brad 435: Due to buffer overflows in telnet(1), a malicious
436: server or man-in-the-middle attack could allow
437: execution of arbitrary code with the privileges of
438: the user invoking telnet(1).</a>
1.311 deraadt 439: <li><a href="errata36.html#copy">Mar 16, 2005:
1.307 brad 440: More stringent checking should be done in the copy(9)
441: functions to prevent their misuse.</a>
1.311 deraadt 442: <li><a href="errata36.html#locore">Feb 28, 2005:
1.306 brad 443: More stringent checking should be done in the copy(9)
444: functions to prevent their misuse.</a>
1.311 deraadt 445: <li><a href="errata36.html#httpd">Jan 12, 2005:
1.304 brad 446: httpd(8)'s mod_include module fails to properly validate
447: the length of user supplied tag strings prior to copying
1.305 brad 448: them to a local buffer, causing a buffer overflow.</a>
1.311 deraadt 449: <li><a href="errata36.html#pfkey">Dec 14, 2004:
1.302 markus 450: On systems running isakmpd(8) it is possible for a local
451: user to cause kernel memory corruption and system panic by
1.303 markus 452: setting ipsec(4) credentials on a socket.</a>
1.302 markus 453: </ul>
1.301 miod 454:
455: <li>
1.288 matthieu 456: <a name="35"></a>
1.279 deraadt 457:
1.294 david 458: <h3><font color="#e00000">OpenBSD 3.5 Security Advisories</font></h3>
1.279 deraadt 459: These are the OpenBSD 3.5 advisories -- all these problems are solved
1.314 miod 460: in <a href="anoncvs.html">OpenBSD current</a>. The
461: <a href="stable.html">patch branch</a> for 3.5 is no longer being maintained,
462: you should update your machine.
1.279 deraadt 463:
464: <p>
465: <ul>
1.310 brad 466: <li><a href="errata35.html#cvs4">Apr 28, 2005:
467: Fix a buffer overflow, memory leaks, and NULL pointer
468: dereference in cvs(1).</a>
1.309 brad 469: <li><a href="errata35.html#telnet">Mar 30, 2005:
470: Due to buffer overflows in telnet(1), a malicious
471: server or man-in-the-middle attack could allow
472: execution of arbitrary code with the privileges of
473: the user invoking telnet(1).</a>
1.308 brad 474: <li><a href="errata35.html#copy">Mar 16, 2005:
1.307 brad 475: More stringent checking should be done in the copy(9)
476: functions to prevent their misuse.</a>
1.306 brad 477: <li><a href="errata35.html#locore">Feb 28, 2005:
478: More stringent checking should be done in the copy(9)
479: functions to prevent their misuse.</a>
1.304 brad 480: <li><a href="errata35.html#httpd3">Jan 12, 2005:
481: httpd(8)'s mod_include module fails to properly validate
482: the length of user supplied tag strings prior to copying
1.305 brad 483: them to a local buffer, causing a buffer overflow.</a>
1.302 markus 484: <li><a href="errata35.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>
1.301 miod 488: <li><a href="errata35.html#radius">Sep 20, 2004:
1.299 millert 489: Radius-based authentication is vulnerable to spoofed replies.</a>
1.301 miod 490: <li><a href="errata35.html#xpm">Sep 16, 2004:
1.298 brad 491: The Xpm library has vulnerabilities when parsing malicious images.</a>
1.301 miod 492: <li><a href="errata35.html#httpd2"> Sep 10, 2004:
1.297 brad 493: httpd(8)'s mod_rewrite module can be made to write one zero byte in
494: an arbitrary memory position outside of a char array, causing a DoS
495: or possibly buffer overflows.</a>
1.301 miod 496: <li><a href="errata35.html#httpd"> Jun 12, 2004:
1.300 deraadt 497: Multiple vulnerabilities have been found in httpd(8) / mod_ssl.</a>
1.301 miod 498: <li><a href="errata35.html#isakmpd"> Jun 10, 2004:
1.291 hshoexer 499: isakmpd(8) still has issues with unauthorized SA deletion,
1.293 brad 500: an attacker can delete IPsec tunnels at will.</a>
1.301 miod 501: <li><a href="errata35.html#cvs3"> Jun 9, 2004:
1.290 millert 502: Multiple remote vulnerabilities have been found in the cvs(1)
503: server which can be used by CVS clients to crash or execute
1.293 brad 504: arbitrary code on the server.</a>
1.301 miod 505: <li><a href="errata35.html#kerberos"> May 30, 2004:
1.289 beck 506: kdc(8) performs inadequate checking of request fields, leading
507: to the possibility of principal impersonation from other
508: Kerberos realms if they are trusted with a cross-realm trust.</a>
1.301 miod 509: <li><a href="errata35.html#xdm"> May 26, 2004:
1.287 matthieu 510: xdm(1) ignores the requestPort resource and creates a
1.293 brad 511: listening socket regardless of the setting in xdm-config.</a>
1.301 miod 512: <li><a href="errata35.html#cvs2"> May 20, 2004:
1.286 otto 513: A buffer overflow in the cvs(1) server has been found,
514: which can be used by CVS clients to execute arbitrary code on
1.293 brad 515: the server.</a>
1.301 miod 516: <li><a href="errata35.html#procfs"> May 13, 2004:
1.282 tedu 517: Integer overflow problems were found in procfs, allowing
1.293 brad 518: reading of arbitrary kernel memory.</a>
1.301 miod 519: <li><a href="errata35.html#cvs"> May 5, 2004:
1.281 otto 520: Pathname validation problems have been found in cvs(1),
521: allowing clients and servers access to files outside the
1.293 brad 522: repository or local CVS tree.</a>
1.279 deraadt 523: </ul>
524:
525: <p>
526: <li>
1.288 matthieu 527: <a name="34"></a>
1.261 david 528:
1.294 david 529: <h3><font color="#e00000">OpenBSD 3.4 Security Advisories</font></h3>
1.261 david 530: These are the OpenBSD 3.4 advisories -- all these problems are solved
1.301 miod 531: in <a href="anoncvs.html">OpenBSD current</a>. The
532: <a href="stable.html">patch branch</a> for 3.4 is no longer being maintained,
533: you should update your machine.
1.261 david 534: <p>
535: <ul>
1.302 markus 536: <li><a href="errata34.html#pfkey">Dec 14, 2004:
537: On systems running isakmpd(8) it is possible for a local
538: user to cause kernel memory corruption and system panic by
1.303 markus 539: setting ipsec(4) credentials on a socket.</a>
1.298 brad 540: <li><a href="errata34.html#xpm">Sep 16, 2004:
541: The Xpm library has vulnerabilities when parsing malicious images.</a>
1.297 brad 542: <li><a href="errata34.html#httpd4"> Sep 10, 2004:
543: httpd(8)'s mod_rewrite module can be made to write one zero byte in
544: an arbitrary memory position outside of a char array, causing a DoS
545: or possibly buffer overflows.</a>
1.294 david 546: <li><a href="errata34.html#httpd3"> Jun 12, 2004:
1.300 deraadt 547: Multiple vulnerabilities have been found in httpd(8) / mod_ssl.</a>
1.294 david 548: <li><a href="errata34.html#isakmpd3"> Jun 10, 2004:
1.292 brad 549: isakmpd(8) still has issues with unauthorized SA deletion,
1.293 brad 550: an attacker can delete IPsec tunnels at will.</a>
1.294 david 551: <li><a href="errata34.html#cvs3"> Jun 9, 2004:
1.290 millert 552: Multiple remote vulnerabilities have been found in the cvs(1)
553: server which can be used by CVS clients to crash or execute
1.293 brad 554: arbitrary code on the server.</a>
1.294 david 555: <li><a href="errata34.html#kerberos"> May 30, 2004:
1.289 beck 556: kdc(8) performs inadequate checking of request fields, leading
557: to the possibility of principal impersonation from other
558: Kerberos realms if they are trusted with a cross-realm trust.</a>
1.294 david 559: <li><a href="errata34.html#cvs2"> May 20, 2004:
1.286 otto 560: A buffer overflow in the cvs(1) server has been found,
561: which can be used by CVS clients to execute arbitrary code on
562: the server.</a>
1.294 david 563: <li><a href="errata34.html#procfs"> May 13, 2004:
1.282 tedu 564: Integer overflow problems were found in procfs, allowing
565: reading of arbitrary kernel memory.</a>
1.294 david 566: <li><a href="errata34.html#cvs"> May 5, 2004:
1.281 otto 567: Pathname validation problems have been found in cvs(1),
568: allowing clients and servers access to files outside the
569: repository or local CVS tree.</a>
1.294 david 570: <li><a href="errata34.html#openssl"> March 17, 2004:
1.277 millert 571: A missing check for a NULL-pointer dereference may allow a
1.281 otto 572: remote attacker to crash applications using OpenSSL.</a>
1.294 david 573: <li><a href="errata34.html#isakmpd2"> March 17, 2004:
1.276 brad 574: Defects in the payload validation and processing functions of
575: isakmpd have been discovered. An attacker could send malformed
576: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.294 david 577: <li><a href="errata34.html#httpd2"> March 13, 2004:
1.275 brad 578: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
579: access module, using IP addresses without a netmask on big endian
580: 64-bit platforms causes the rules to fail to match.</a>
1.294 david 581: <li><a href="errata34.html#ip6"> February 8, 2004:
1.272 dhartmei 582: An IPv6 MTU handling problem exists that could be used by an
583: attacker to cause a denial of service attack.</a>
1.294 david 584: <li><a href="errata34.html#sysvshm"> February 5, 2004:
1.271 millert 585: A reference counting bug in shmat(2) could be used to write to
586: kernel memory under certain circumstances.</a>
1.294 david 587: <li><a href="errata34.html#isakmpd">January 13, 2004:
1.266 brad 588: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 589: by Thomas Walpuski.</a>
1.294 david 590: <li><a href="errata34.html#ibcs2">November 17, 2003:
1.264 henning 591: It may be possible for a local user to overrun the stack in
592: compat_ibcs2(8) and cause a kernel panic.</a>
1.294 david 593: <li><a href="errata34.html#asn1">November 1, 2003:
1.262 margarid 594: The use of certain ASN.1 encodings or malformed public keys may
595: allow an attacker to mount a denial of service attack against
596: applications linked with ssl(3).</a>
1.261 david 597: </ul>
598:
599: <li>
1.288 matthieu 600: <a name="33"></a>
1.246 deraadt 601:
1.294 david 602: <h3><font color="#e00000">OpenBSD 3.3 Security Advisories</font></h3>
1.246 deraadt 603: These are the OpenBSD 3.3 advisories -- all these problems are solved
1.294 david 604: in <a href="anoncvs.html">OpenBSD current</a>. The
605: <a href="stable.html">patch branch</a> for 3.3 is no longer being maintained,
1.284 otto 606: you should update your machine.
1.246 deraadt 607: <p>
608: <ul>
1.294 david 609: <li><a href="errata33.html#cvs"> May 5, 2004:
1.281 otto 610: Pathname validation problems have been found in cvs(1),
611: allowing clients and servers access to files outside the
612: repository or local CVS tree.</a>
1.294 david 613: <li><a href="errata33.html#openssl"> March 17, 2004:
1.277 millert 614: A missing check for a NULL-pointer dereference may allow a
1.281 otto 615: remote attacker to crash applications using OpenSSL.</a>
1.294 david 616: <li><a href="errata33.html#isakmpd2"> March 17, 2004:
1.276 brad 617: Defects in the payload validation and processing functions of
618: isakmpd have been discovered. An attacker could send malformed
619: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.294 david 620: <li><a href="errata33.html#httpd2"> March 13, 2004:
1.275 brad 621: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
622: access module, using IP addresses without a netmask on big endian
623: 64-bit platforms causes the rules to fail to match.</a>
1.294 david 624: <li><a href="errata33.html#ip6"> February 8, 2004:
1.275 brad 625: An IPv6 MTU handling problem exists that could be used by an
626: attacker to cause a denial of service attack.</a>
1.294 david 627: <li><a href="errata33.html#sysvshm"> February 5, 2004:
1.271 millert 628: A reference counting bug in shmat(2) could be used to write to
629: kernel memory under certain circumstances.</a>
1.294 david 630: <li><a href="errata33.html#isakmpd">January 15, 2004:
1.268 brad 631: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 632: by Thomas Walpuski.</a>
1.294 david 633: <li><a href="errata33.html#ibcs2">November 17, 2003:
1.264 henning 634: It may be possible for a local user to execute arbitrary code
635: resulting in escalation of privileges due to a stack overrun
636: in compat_ibcs2(8).</a>
1.294 david 637: <li><a href="errata33.html#asn1">October 1, 2003:
1.257 millert 638: The use of certain ASN.1 encodings or malformed public keys may
639: allow an attacker to mount a denial of service attack against
640: applications linked with ssl(3).</a>
1.294 david 641: <li><a href="errata33.html#pfnorm">September 24, 2003:
1.258 beck 642: Access of freed memory in pf(4) could be used to
1.260 margarid 643: remotely panic a machine using scrub rules.</a>
1.294 david 644: <li><a href="errata33.html#sendmail">September 17, 2003:
1.256 millert 645: A buffer overflow in the address parsing in
646: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 647: <li><a href="errata33.html#sshbuffer">September 16, 2003:
1.255 millert 648: OpenSSH versions prior to 3.7 contains a buffer management error
649: that is potentially exploitable.</a>
1.294 david 650: <li><a href="errata33.html#sysvsem">September 10, 2003:
1.254 millert 651: Root may be able to reduce the security level by taking advantage of
652: an integer overflow when the semaphore limits are made very large.</a>
1.294 david 653: <li><a href="errata33.html#semget">August 20, 2003:
1.252 millert 654: An improper bounds check in the kernel may allow a local user
655: to panic the kernel.</a>
1.294 david 656: <li><a href="errata33.html#realpath">August 4, 2003:
1.249 millert 657: An off-by-one error exists in the C library function realpath(3)
658: may allow an attacker to gain escalated privileges.</a>
1.246 deraadt 659: </ul>
660:
1.265 miod 661:
1.247 david 662: <p>
1.246 deraadt 663: <li>
1.288 matthieu 664: <a name="32"></a>
1.224 deraadt 665:
1.294 david 666: <h3><font color="#e00000">OpenBSD 3.2 Security Advisories</font></h3>
1.224 deraadt 667: These are the OpenBSD 3.2 advisories -- all these problems are solved
1.294 david 668: in <a href="anoncvs.html">OpenBSD current</a>. The
669: <a href="stable.html">patch branch</a> for 3.2 is no longer being maintained,
1.265 miod 670: you should update your machine.
1.224 deraadt 671: <p>
672: <ul>
1.294 david 673: <li><a href="errata32.html#asn1">October 1, 2003:
1.257 millert 674: The use of certain ASN.1 encodings or malformed public keys may
675: allow an attacker to mount a denial of service attack against
676: applications linked with ssl(3). This does not affect OpenSSH.</a>
1.294 david 677: <li><a href="errata32.html#pfnorm">September 24, 2003:
1.258 beck 678: Access of freed memory in pf(4) could be used to
1.260 margarid 679: remotely panic a machine using scrub rules.</a>
1.294 david 680: <li><a href="errata32.html#sendmail4">September 17, 2003:
1.256 millert 681: A buffer overflow in the address parsing in
682: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 683: <li><a href="errata32.html#sshbuffer">September 16, 2003:
1.255 millert 684: OpenSSH versions prior to 3.7 contains a buffer management error
685: that is potentially exploitable.</a>
1.294 david 686: <li><a href="errata32.html#sendmail3">August 25, 2003:
1.253 brad 687: Fix for a potential security issue in
688: sendmail(8) with respect to DNS maps.</a>
1.294 david 689: <li><a href="errata32.html#realpath">August 4, 2003:
1.249 millert 690: An off-by-one error exists in the C library function realpath(3)
691: may allow an attacker to gain escalated privileges.</a>
1.294 david 692: <li><a href="errata32.html#sendmail2">March 31, 2003:
1.244 miod 693: A buffer overflow in the address parsing in
694: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 695: <li><a href="errata32.html#kerberos">March 24, 2003:
1.242 millert 696: A cryptographic weaknesses in the Kerberos v4 protocol can be
697: exploited on Kerberos v5 as well.</a>
1.294 david 698: <li><a href="errata32.html#kpr">March 19, 2003:
1.241 jufi 699: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 700: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.294 david 701: <li><a href="errata32.html#blinding">March 18, 2003:
1.239 miod 702: Various SSL and TLS operations in OpenSSL are vulnerable to
703: timing attacks.</a>
1.294 david 704: <li><a href="errata32.html#lprm">March 5, 2003:
1.238 millert 705: A buffer overflow in lprm(1) may allow an attacker to elevate
706: privileges to user daemon.</a>.
1.294 david 707: <li><a href="errata32.html#sendmail">March 3, 2003:
1.237 miod 708: A buffer overflow in the envelope comments processing in
709: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 710: <li><a href="errata32.html#httpd">February 25, 2003:
1.236 margarid 711: httpd(8) leaks file inode numbers via ETag header as well as
712: child PIDs in multipart MIME boundary generation. This could
713: lead, for example, to NFS exploitation because it uses inode
714: numbers as part of the file handle.</a>
1.294 david 715: <li><a href="errata32.html#ssl">February 22, 2003:
1.234 margarid 716: In ssl(8) an information leak can occur via timing by performing
717: a MAC computation even if incorrect block cipher padding has
718: been found, this is a countermeasure. Also, check for negative
719: sizes, in allocation routines.</a>
1.294 david 720: <li><a href="errata32.html#cvs">January 20, 2003:
1.232 millert 721: A double free exists in cvs(1) that could lead to privilege
722: escalation for cvs configurations where the cvs command is
1.233 margarid 723: run as a privileged user.</a>
1.294 david 724: <li><a href="errata32.html#named">November 14, 2002:
1.230 millert 725: A buffer overflow exists in named(8) that could lead to a
726: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 727: <li><a href="errata32.html#pool">November 6, 2002:
1.233 margarid 728: A logic error in the pool kernel memory allocator could cause
729: memory corruption in low-memory situations, causing the system
730: to crash.</a>
1.294 david 731: <li><a href="errata32.html#smrsh">November 6, 2002:
1.229 miod 732: An attacker can bypass smrsh(8)'s restrictions and execute
733: arbitrary commands with the privileges of his own account.</a>
1.294 david 734: <li><a href="errata32.html#pfbridge">November 6, 2002:
1.233 margarid 735: Network bridges running pf with scrubbing enabled could cause
736: mbuf corruption, causing the system to crash.</a>
1.294 david 737: <li><a href="errata32.html#kadmin">October 21, 2002:
1.228 miod 738: A buffer overflow can occur in the kadmind(8) daemon, leading
739: to possible remote crash or exploit.</a>
1.224 deraadt 740: </ul>
741:
1.227 miod 742: <p>
743: <li>
1.288 matthieu 744: <a name="31"></a>
1.203 deraadt 745:
1.294 david 746: <h3><font color="#e00000">OpenBSD 3.1 Security Advisories</font></h3>
1.203 deraadt 747: These are the OpenBSD 3.1 advisories -- all these problems are solved
1.294 david 748: in <a href="anoncvs.html">OpenBSD current</a>. The
749: <a href="stable.html">patch branch</a> for 3.1 is no longer being maintained,
1.258 beck 750: you should update your machine.
1.203 deraadt 751:
752: <p>
753: <ul>
1.294 david 754: <li><a href="errata31.html#sendmail2">March 31, 2003:
1.244 miod 755: A buffer overflow in the address parsing in
756: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 757: <li><a href="errata31.html#kerberos">March 24, 2003:
1.242 millert 758: A cryptographic weaknesses in the Kerberos v4 protocol can be
759: exploited on Kerberos v5 as well.</a>
1.294 david 760: <li><a href="errata31.html#kpr">March 19, 2003:
1.241 jufi 761: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 762: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.294 david 763: <li><a href="errata31.html#blinding">March 18, 2003:
1.239 miod 764: Various SSL and TLS operations in OpenSSL are vulnerable to
765: timing attacks.</a>
1.294 david 766: <li><a href="errata31.html#lprm">March 4, 2003:
1.238 millert 767: A buffer overflow in lprm(1) may allow an attacker to gain
768: root privileges.</a>
1.294 david 769: <li><a href="errata31.html#sendmail">March 3, 2003:
1.237 miod 770: A buffer overflow in the envelope comments processing in
771: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 772: <li><a href="errata31.html#ssl2">February 23, 2003:
1.235 miod 773: In ssl(8) an information leak can occur via timing by performing
774: a MAC computation even if incorrect block cipher padding has
775: been found, this is a countermeasure. Also, check for negative
776: sizes, in allocation routines.</a>
1.294 david 777: <li><a href="errata31.html#cvs">January 20, 2003:
1.232 millert 778: A double free exists in cvs(1) that could lead to privilege
779: escalation for cvs configurations where the cvs command is
1.294 david 780: run as a privileged user</a>.
781: <li><a href="errata31.html#named">November 14, 2002:
1.230 millert 782: A buffer overflow exists in named(8) that could lead to a
783: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 784: <li><a href="errata31.html#kernresource">November 6, 2002:
1.229 miod 785: Incorrect argument checking in the getitimer(2) system call
786: may allow an attacker to crash the system.</a>
1.294 david 787: <li><a href="errata31.html#smrsh">November 6, 2002:
1.229 miod 788: An attacker can bypass smrsh(8)'s restrictions and execute
789: arbitrary commands with the privileges of his own account.</a>
1.294 david 790: <li><a href="errata31.html#kadmin">October 21, 2002:
1.226 miod 791: A buffer overflow can occur in the kadmind(8) daemon, leading
792: to possible remote crash or exploit.</a>
1.294 david 793: <li><a href="errata31.html#kerntime">October 2, 2002:
1.222 jason 794: Incorrect argument checking in the setitimer(2) system call
795: may allow an attacker to write to kernel memory.</a>
1.294 david 796: <li><a href="errata31.html#scarg">August 11, 2002:
1.221 provos 797: An insufficient boundary check in the select system call
1.220 miod 798: allows an attacker to overwrite kernel memory and execute arbitrary code
799: in kernel context.</a>
1.294 david 800: <li><a href="errata31.html#ssl">July 30, 2002:
1.218 miod 801: Several remote buffer overflows can occur in the SSL2 server and SSL3
802: client of the ssl(8) library, as in the ASN.1 parser code in the
803: crypto(3) library, all of them being potentially remotely
804: exploitable.</a>
1.294 david 805: <li><a href="errata31.html#xdr">July 29, 2002:
1.218 miod 806: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
807: possible remote crash.</a>
1.294 david 808: <li><a href="errata31.html#pppd">July 29, 2002:
1.218 miod 809: A race condition exists in the pppd(8) daemon which may cause it to
810: alter the file permissions of an arbitrary file.</a>
1.294 david 811: <li><a href="errata31.html#isakmpd">July 5, 2002:
1.218 miod 812: Receiving IKE payloads out of sequence can cause isakmpd(8) to
813: crash.</a>
1.294 david 814: <li><a href="errata31.html#ktrace">June 27, 2002:
1.215 miod 815: The kernel would let any user ktrace set[ug]id processes.</a>
1.294 david 816: <li><a href="errata31.html#modssl">June 26, 2002:
1.213 miod 817: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 818: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.294 david 819: <li><a href="errata31.html#resolver">June 25, 2002:
1.212 millert 820: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 821: <li><a href="errata31.html#sshd">June 24, 2002:
1.216 deraadt 822: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 823: input validation error that can result in an integer overflow and
824: privilege escalation.</a>
1.294 david 825: <li><a href="errata31.html#httpd">June 19, 2002:
1.211 miod 826: A buffer overflow can occur during the interpretation of chunked
827: encoding in httpd(8), leading to possible remote crash.</a>
1.294 david 828: <li><a href="errata31.html#sshbsdauth">May 22, 2002:
1.209 markus 829: Under certain conditions, on systems using YP with netgroups
830: in the password database, it is possible that sshd(8) does
831: ACL checks for the requested user name but uses the password
832: database entry of a different user for authentication. This
833: means that denied users might authenticate successfully
834: while permitted users could be locked out.</a>
1.294 david 835: <li><a href="errata31.html#fdalloc2">May 8, 2002:
1.208 millert 836: A race condition exists that could defeat the kernel's
837: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 838: <li><a href="errata31.html#sudo">April 25, 2002:
1.205 millert 839: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 840: <li><a href="errata31.html#sshafs">April 22, 2002:
1.205 millert 841: A local user can gain super-user privileges due to a buffer
842: overflow in sshd(8) if AFS has been configured on the system
843: or if KerberosTgtPassing or AFSTokenPassing has been enabled
844: in the sshd_config file.</a>
1.203 deraadt 845: </ul>
846:
1.235 miod 847: <p>
1.203 deraadt 848: <li>
1.288 matthieu 849: <a name="30"></a>
1.187 deraadt 850:
1.294 david 851: <h3><font color="#e00000">OpenBSD 3.0 Security Advisories</font></h3>
1.187 deraadt 852: These are the OpenBSD 3.0 advisories -- all these problems are solved
1.294 david 853: in <a href="anoncvs.html">OpenBSD current</a>. The
854: <a href="stable.html">patch branch</a> for 3.0 is no longer being maintained,
1.258 beck 855: you should update your machine.
1.187 deraadt 856:
857: <p>
858: <ul>
1.294 david 859: <li><a href="errata30.html#named">November 14, 2002:
1.230 millert 860: A buffer overflow exists in named(8) that could lead to a
861: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 862: <li><a href="errata30.html#kernresource">November 6, 2002:
1.229 miod 863: Incorrect argument checking in the getitimer(2) system call
864: may allow an attacker to crash the system.</a>
1.294 david 865: <li><a href="errata30.html#smrsh">November 6, 2002:
1.229 miod 866: An attacker can bypass smrsh(8)'s restrictions and execute
867: arbitrary commands with the privileges of his own account.</a>
1.294 david 868: <li><a href="errata30.html#kadmin">October 21, 2002:
1.226 miod 869: A buffer overflow can occur in the kadmind(8) daemon, leading
870: to possible remote crash or exploit.</a>
1.294 david 871: <li><a href="errata30.html#kerntime">October 7, 2002:
1.223 miod 872: Incorrect argument checking in the setitimer(2) system call
873: may allow an attacker to write to kernel memory.</a>
1.294 david 874: <li><a href="errata30.html#scarg">August 11, 2002:
1.220 miod 875: An insufficient boundary check in the select and poll system calls
876: allows an attacker to overwrite kernel memory and execute arbitrary code
877: in kernel context.</a>
1.294 david 878: <li><a href="errata30.html#ssl">July 30, 2002:
1.218 miod 879: Several remote buffer overflows can occur in the SSL2 server and SSL3
880: client of the ssl(8) library, as in the ASN.1 parser code in the
881: crypto(3) library, all of them being potentially remotely
882: exploitable.</a>
1.294 david 883: <li><a href="errata30.html#xdr">July 29, 2002:
1.218 miod 884: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
885: possible remote crash.</a>
1.294 david 886: <li><a href="errata30.html#pppd">July 29, 2002:
1.218 miod 887: A race condition exists in the pppd(8) daemon which may cause it to
888: alter the file permissions of an arbitrary file.</a>
1.294 david 889: <li><a href="errata30.html#isakmpd2">July 5, 2002:
1.218 miod 890: Receiving IKE payloads out of sequence can cause isakmpd(8) to
891: crash.</a>
1.294 david 892: <li><a href="errata30.html#ktrace">June 27, 2002:
1.215 miod 893: The kernel would let any user ktrace set[ug]id processes.</a>
1.294 david 894: <li><a href="errata30.html#resolver">June 25, 2002:
1.212 millert 895: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 896: <li><a href="errata30.html#sshdauth">June 24, 2002:
1.216 deraadt 897: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 898: input validation error that can result in an integer overflow and
899: privilege escalation.</a>
1.294 david 900: <li><a href="errata30.html#modssl">June 24, 2002:
1.213 miod 901: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 902: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.294 david 903: <li><a href="errata30.html#httpd">June 19, 2002:
1.213 miod 904: A buffer overflow can occur during the interpretation of chunked
905: encoding in httpd(8), leading to possible remote crash.</a>
1.294 david 906: <li><a href="errata30.html#fdalloc2">May 8, 2002:
1.208 millert 907: A race condition exists that could defeat the kernel's
908: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 909: <li><a href="errata30.html#sudo2">April 25, 2002:
1.205 millert 910: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 911: <li><a href="errata30.html#sshafs">April 22, 2002:
1.205 millert 912: A local user can gain super-user privileges due to a buffer
913: overflow in sshd(8) if AFS has been configured on the system
914: or if KerberosTgtPassing or AFSTokenPassing has been enabled
915: in the sshd_config file.</a>
1.294 david 916: <li><a href="errata30.html#mail">April 11, 2002:
1.202 millert 917: The mail(1) was interpreting tilde escapes even when invoked
918: in non-interactive mode. As mail(1) is called as root from cron,
919: this can lead to a local root compromise.</a>
1.294 david 920: <li><a href="errata30.html#approval">March 19, 2002:
1.201 millert 921: Under certain conditions, on systems using YP with netgroups in
922: the password database, it is possible for the rexecd(8) and rshd(8)
923: daemons to execute a shell from a password database entry for a
924: different user. Similarly, atrun(8) may change to the wrong
925: home directory when running jobs.</a>
1.294 david 926: <li><a href="errata30.html#zlib">March 13, 2002:
1.200 millert 927: A potential double free() exists in the zlib library;
928: this is not exploitable on OpenBSD.
929: The kernel also contains a copy of zlib; it is not
930: currently known if the kernel zlib is exploitable.</a>
1.294 david 931: <li><a href="errata30.html#openssh">March 8, 2002:
1.198 millert 932: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 933: may allow a local user to gain super-user privileges.</a>
1.294 david 934: <li><a href="errata30.html#ptrace">January 21, 2002:
1.192 jason 935: A race condition between the ptrace(2) and execve(2) system calls
936: allows an attacker to modify the memory contents of suid/sgid
937: processes which could lead to compromise of the super-user account.</a>
1.294 david 938: <li><a href="errata30.html#sudo">January 17, 2002:
1.191 millert 939: There is a security hole in sudo(8) that can be exploited
940: when the Postfix sendmail replacement is installed that may
941: allow an attacker on the local host to gain root privileges.</a>
1.294 david 942: <li><a href="errata30.html#lpd">November 28, 2001:
1.189 millert 943: An attacker can trick a machine running the lpd daemon into
944: creating new files in the root directory from a machine with
945: remote line printer access.</a>
1.294 david 946: <li><a href="errata30.html#vi.recover">November 13, 2001:
1.188 millert 947: The vi.recover script can be abused in such a way as
948: to cause arbitrary zero-length files to be removed.</a>
1.294 david 949: <li><a href="errata30.html#pf">November 13, 2001:
1.190 mpech 950: pf(4) was incapable of dealing with certain ipv6 icmp packets,
951: resulting in a crash.</a>
1.294 david 952: <li><a href="errata30.html#sshd">November 12, 2001:
1.190 mpech 953: A security hole that may allow an attacker to partially authenticate
954: if -- and only if -- the administrator has enabled KerberosV.</a>
1.187 deraadt 955: </ul>
956:
957: <p>
958: <li>
1.288 matthieu 959: <a name="29"></a>
1.173 deraadt 960:
1.294 david 961: <h3><font color="#e00000">OpenBSD 2.9 Security Advisories</font></h3>
1.173 deraadt 962: These are the OpenBSD 2.9 advisories -- all these problems are solved
1.294 david 963: in <a href="anoncvs.html">OpenBSD current</a>. The
964: <a href="stable.html">patch branch</a>. for 2.9 is no longer being maintained,
1.258 beck 965: you should update your machine.
966:
1.173 deraadt 967:
968: <p>
969: <ul>
1.294 david 970: <li><a href="errata29.html#resolver">June 25, 2002:
1.212 millert 971: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 972: <li><a href="errata29.html#fdalloc2">May 8, 2002:
1.208 millert 973: A race condition exists that could defeat the kernel's
974: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 975: <li><a href="errata29.html#sudo2">April 25, 2002:
1.207 millert 976: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 977: <li><a href="errata29.html#sshafs">April 22, 2002:
1.206 millert 978: A local user can gain super-user privileges due to a buffer
979: overflow in sshd(8) if AFS has been configured on the system
980: or if KerberosTgtPassing or AFSTokenPassing has been enabled
981: in the sshd_config file.</a>
1.294 david 982: <li><a href="errata29.html#mail">April 11, 2002:
1.202 millert 983: The mail(1) was interpreting tilde escapes even when invoked
984: in non-interactive mode. As mail(1) is called as root from cron,
985: this can lead to a local root compromise.</a>
1.294 david 986: <li><a href="errata29.html#zlib">March 13, 2002:
1.200 millert 987: A potential double free() exists in the zlib library;
988: this is not exploitable on OpenBSD.
989: The kernel also contains a copy of zlib; it is not
990: currently known if the kernel zlib is exploitable.</a>
1.294 david 991: <li><a href="errata29.html#openssh">March 8, 2002:
1.198 millert 992: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 993: may allow a local user to gain super-user privileges.</a>
1.294 david 994: <li><a href="errata29.html#ptrace">January 21, 2002:
1.198 millert 995: A race condition between the ptrace(2) and execve(2) system calls
996: allows an attacker to modify the memory contents of suid/sgid
997: processes which could lead to compromise of the super-user account.</a>
1.294 david 998: <li><a href="errata29.html#sudo">January 17, 2002:
1.191 millert 999: There is a security hole in sudo(8) that can be exploited
1000: when the Postfix sendmail replacement is installed that may
1001: allow an attacker on the local host to gain root privileges.</a>
1.294 david 1002: <li><a href="errata29.html#lpd2">November 28, 2001:
1.189 millert 1003: An attacker can trick a machine running the lpd daemon into
1004: creating new files in the root directory from a machine with
1005: remote line printer access.</a>
1.294 david 1006: <li><a href="errata29.html#vi.recover">November 13, 2001:
1.190 mpech 1007: The vi.recover script can be abused in such a way as
1008: to cause arbitrary zero-length files to be removed.</a>
1.294 david 1009: <li><a href="errata29.html#uucp">September 11, 2001:
1.184 millert 1010: A security hole exists in uuxqt(8) that may allow an
1011: attacker to gain root privileges.</a>
1.294 david 1012: <li><a href="errata29.html#lpd">August 29, 2001:
1.183 millert 1013: A security hole exists in lpd(8) that may allow an
1014: attacker to gain root privileges if lpd is running.</a>
1.294 david 1015: <li><a href="errata29.html#sendmail2">August 21, 2001:
1.181 millert 1016: A security hole exists in sendmail(8) that may allow an
1017: attacker on the local host to gain root privileges.</a>
1.294 david 1018: <li><a href="errata29.html#nfs">July 30, 2001:
1.180 jason 1019: A kernel buffer overflow in the NFS code can be used to execute
1020: arbitrary code by users with mount privileges (only root by
1.181 millert 1021: default).</a>
1.294 david 1022: <li><a href="errata29.html#kernexec">June 15, 2001:
1.178 aaron 1023: A race condition in the kernel can lead to local root compromise.</a>
1.294 david 1024: <li><a href="errata29.html#sshcookie">June 12, 2001:
1.177 markus 1025: sshd(8) allows users to delete arbitrary files named "cookies"
1026: if X11 forwarding is enabled. X11 forwarding is disabled
1027: by default.</a>
1.294 david 1028: <li><a href="errata29.html#fts">May 30, 2001:
1.176 millert 1029: Programs using the fts routines can be tricked into changing
1030: into the wrong directory.</a>
1.294 david 1031: <li><a href="errata29.html#sendmail">May 29, 2001:
1.174 millert 1032: Sendmail signal handlers contain unsafe code,
1033: leading to numerous race conditions.</a>
1.173 deraadt 1034: </ul>
1035:
1036: <p>
1037: <li>
1.288 matthieu 1038: <a name="28"></a>
1.152 deraadt 1039:
1.294 david 1040: <h3><font color="#e00000">OpenBSD 2.8 Security Advisories</font></h3>
1.152 deraadt 1041: These are the OpenBSD 2.8 advisories -- all these problems are solved
1.294 david 1042: in <a href="anoncvs.html">OpenBSD current</a>. The
1043: <a href="stable.html">patch branch</a>. for 2.8 is no longer being maintained,
1.258 beck 1044: you should update your machine.
1045:
1.152 deraadt 1046:
1047: <p>
1048: <ul>
1.294 david 1049: <li><a href="errata28.html#uucp">September 11, 2001:
1.184 millert 1050: A security hole exists in uuxqt(8) that may allow an
1051: attacker to gain root privileges.</a>
1.294 david 1052: <li><a href="errata28.html#lpd">August 29, 2001:
1.183 millert 1053: A security hole exists in lpd(8) that may allow an
1054: attacker to gain root privileges if lpd is running.</a>
1.294 david 1055: <li><a href="errata28.html#sendmail2">August 21, 2001:
1.181 millert 1056: A security hole exists in sendmail(8) that may allow an
1057: attacker on the local host to gain root privileges.</a>
1.294 david 1058: <li><a href="errata28.html#kernexec">June 15, 2001:
1.178 aaron 1059: A race condition in the kernel can lead to local root compromise.</a>
1.294 david 1060: <li><a href="errata28.html#fts">May 30, 2001:
1.176 millert 1061: Programs using the fts routines can be tricked into changing
1062: into the wrong directory.</a>
1.294 david 1063: <li><a href="errata28.html#sendmail">May 29, 2001:
1.175 millert 1064: Sendmail signal handlers contain unsafe code,
1065: leading to numerous race conditions.</a>
1.294 david 1066: <li><a href="errata28.html#ipf_frag">Apr 23, 2001:
1.231 mickey 1067: IPF contains a serious bug with its handling of fragment caching.</a>
1.294 david 1068: <li><a href="errata28.html#glob_limit">Apr 23, 2001:
1.172 ericj 1069: ftpd(8) contains a potential DoS relating to glob(3).</a>
1.294 david 1070: <li><a href="errata28.html#glob">Apr 10, 2001:
1.170 ericj 1071: The glob(3) library call contains multiple buffer overflows.</a>
1.294 david 1072: <li><a href="errata28.html#readline">Mar 18, 2001:
1.169 millert 1073: The readline library creates history files with permissive modes based on the user's umask.</a>
1.294 david 1074: <li><a href="errata28.html#ipsec_ah">Mar 2, 2001:
1.167 ericj 1075: Insufficient checks in the IPSEC AH IPv4 option handling code can lead to a buffer overrun in the kernel.</a>
1.294 david 1076: <li><a href="errata28.html#userldt">Mar 2, 2001:
1.168 horacio 1077: The <b>USER_LDT</b> kernel option allows an attacker to gain access to privileged areas of kernel memory.</a>
1.294 david 1078: <li><a href="errata28.html#sudo">Feb 22, 2001:
1.171 millert 1079: a non-exploitable buffer overflow was fixed in sudo(8).</a>
1.294 david 1080: <li><a href="errata28.html#named">Jan 29, 2001:
1.163 jason 1081: merge named(8) with ISC BIND 4.9.8-REL, which fixes some buffer vulnerabilities.</a>
1.294 david 1082: <li><a href="errata28.html#rnd">Jan 22, 2001:
1.162 jason 1083: rnd(4) did not use all of its input when written to.</a>
1.294 david 1084: <li><a href="errata28.html#xlock">Dec 22, 2000:
1.159 ericj 1085: xlock(1)'s authentication was re-done to authenticate via a named pipe. (patch and new xlock binaries included).</a>
1.294 david 1086: <li><a href="errata28.html#procfs">Dec 18, 2000:
1.157 ericj 1087: Procfs contains numerous overflows. Procfs is not used by default in OpenBSD. (patch included).</a>
1.294 david 1088: <li><a href="errata28.html#kerberos2">Dec 10, 2000:
1.156 deraadt 1089: Another problem exists in KerberosIV libraries (patch included).</a>
1.294 david 1090: <li><a href="errata28.html#kerberos">Dec 7, 2000:
1.155 deraadt 1091: A set of problems in KerberosIV exist (patch included).</a>
1.294 david 1092: <li><a href="errata28.html#ftpd">Dec 4, 2000:
1.154 millert 1093: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.152 deraadt 1094: </ul>
1095:
1096: <p>
1097: <li>
1.288 matthieu 1098: <a name="27"></a>
1.124 deraadt 1099:
1.294 david 1100: <h3><font color="#e00000">OpenBSD 2.7 Security Advisories</font></h3>
1.124 deraadt 1101: These are the OpenBSD 2.7 advisories -- all these problems are solved
1.294 david 1102: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.124 deraadt 1103: OpenBSD 2.6 advisories listed below are fixed in OpenBSD 2.7.
1104:
1105: <p>
1106: <ul>
1.294 david 1107: <li><a href="errata27.html#readline">Mar 18, 2001:
1.169 millert 1108: The readline library creates history files with permissive modes based on the user's umask.</a>
1.294 david 1109: <li><a href="errata27.html#sudo">Feb 22, 2001:
1.169 millert 1110: a buffer overflow was fixed in sudo(8).</a>
1.294 david 1111: <li><a href="errata27.html#ftpd">Dec 4, 2000:
1.154 millert 1112: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.294 david 1113: <li><a href="errata27.html#sshforwarding">Nov 10, 2000:
1.152 deraadt 1114: Hostile servers can force OpenSSH clients to do agent or X11 forwarding.
1115: (patch included)</a>
1.294 david 1116: <li><a href="errata27.html#xtrans">Oct 26, 2000:
1.151 matthieu 1117: X11 libraries have 2 potential overflows in xtrans code.
1118: (patch included)</a>
1.294 david 1119: <li><a href="errata27.html#httpd">Oct 18, 2000:
1.150 beck 1120: Apache mod_rewrite and mod_vhost_alias modules could expose files
1121: on the server in certain configurations if used.
1122: (patch included)</a>
1.294 david 1123: <li><a href="errata27.html#telnetd">Oct 10, 2000:
1.149 millert 1124: The telnet daemon does not strip out the TERMINFO, TERMINFO_DIRS,
1125: TERMPATH and TERMCAP environment variables as it should.
1126: (patch included)</a>
1.294 david 1127: <li><a href="errata27.html#format_strings">Oct 6, 2000:
1.148 millert 1128: There are printf-style format string bugs in several privileged
1129: programs. (patch included)</a>
1.294 david 1130: <li><a href="errata27.html#curses">Oct 6, 2000:
1.147 millert 1131: libcurses honored terminal descriptions in the $HOME/.terminfo
1132: directory as well as in the TERMCAP environment variable for
1133: setuid and setgid applications.
1.146 deraadt 1134: (patch included)</a>
1.294 david 1135: <li><a href="errata27.html#talkd">Oct 6, 2000:
1.146 deraadt 1136: A format string vulnerability exists in talkd(8).
1137: (patch included)</a>
1.294 david 1138: <li><a href="errata27.html#pw_error">Oct 3, 2000:
1.145 aaron 1139: A format string vulnerability exists in the pw_error() function of the
1140: libutil library, yielding localhost root through chpass(1).
1141: (patch included)</a>
1.294 david 1142: <li><a href="errata27.html#ipsec">Sep 18, 2000:
1.144 jason 1143: Bad ESP/AH packets could cause a crash under certain conditions.
1144: (patch included)</a>
1.294 david 1145: <li><a href="errata27.html#xlock">Aug 16, 2000:
1.141 deraadt 1146: A format string vulnerability (localhost root) exists in xlock(1).
1147: (patch included)</a>
1.294 david 1148: <li><a href="errata27.html#X11_libs">July 14, 2000:
1.139 deraadt 1149: Various bugs found in X11 libraries have various side effects, almost
1150: completely denial of service in OpenBSD.
1151: (patch included)</a>
1.294 david 1152: <li><a href="errata27.html#ftpd">July 5, 2000:
1.136 deraadt 1153: Just like pretty much all the other unix ftp daemons
1154: on the planet, ftpd had a remote root hole in it.
1155: Luckily, ftpd was not enabled by default.
1.137 deraadt 1156: The problem exists if anonymous ftp is enabled.
1.136 deraadt 1157: (patch included)</a>
1.294 david 1158: <li><a href="errata27.html#mopd">July 5, 2000:
1.136 deraadt 1159: Mopd, very rarely used, contained some buffer overflows.
1160: (patch included)</a>
1.294 david 1161: <li><a href="errata27.html#libedit">June 28, 2000:
1.135 deraadt 1162: libedit would check for a <b>.editrc</b> file in the current
1163: directory. Not known to be a real security issue, but a patch
1164: is available anyways.
1165: (patch included)</a>
1.294 david 1166: <li><a href="errata27.html#dhclient">June 24, 2000:
1.134 deraadt 1167: A serious bug in dhclient(8) could allow strings from a
1168: malicious dhcp server to be executed in the shell as root.
1169: (patch included)</a>
1.294 david 1170: <li><a href="errata27.html#isakmpd">June 9, 2000:
1.133 deraadt 1171: A serious bug in isakmpd(8) policy handling wherein
1172: policy verification could be completely bypassed in isakmpd.
1173: (patch included)</a>
1.294 david 1174: <li><a href="errata27.html#uselogin">June 6, 2000:
1.132 deraadt 1175: The non-default flag UseLogin in <b>/etc/sshd_config</b> is broken,
1176: should not be used, and results in security problems on
1177: other operating systems.</a>
1.294 david 1178: <li><a href="errata27.html#bridge">May 26, 2000:
1.129 deraadt 1179: The bridge(4) <i>learning</i> flag may be bypassed.
1.128 deraadt 1180: (patch included)</a>
1.294 david 1181: <li><a href="errata27.html#ipf">May 25, 2000:
1.127 kjell 1182: Improper use of ipf <i>keep-state</i> rules can result
1183: in firewall rules being bypassed. (patch included)</a>
1184:
1.124 deraadt 1185: </ul>
1186:
1187: <p>
1188: <li>
1.288 matthieu 1189: <a name="26"></a>
1.119 deraadt 1190:
1.294 david 1191: <h3><font color="#e00000">OpenBSD 2.6 Security Advisories</font></h3>
1.119 deraadt 1192: These are the OpenBSD 2.6 advisories -- all these problems are solved
1.294 david 1193: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.119 deraadt 1194: OpenBSD 2.5 advisories listed below are fixed in OpenBSD 2.6.
1195:
1196: <p>
1197: <ul>
1.294 david 1198: <li><a href="errata26.html#semconfig">May 26, 2000:
1.130 deraadt 1199: SYSV semaphore support contained an undocumented system call
1.131 deraadt 1200: which could wedge semaphore-using processes from exiting. (patch included)</a>
1.294 david 1201: <li><a href="errata26.html#ipf">May 25, 2000:
1.127 kjell 1202: Improper use of ipf <i>keep-state</i> rules can result
1203: in firewall rules being bypassed. (patch included)</a>
1.294 david 1204: <li><a href="errata26.html#xlockmore">May 25, 2000:
1.125 deraadt 1205: xlockmore has a bug which a localhost attacker can use to gain
1206: access to the encrypted root password hash (which is normally
1.245 miod 1207: encoded using blowfish</a> (see
1.294 david 1208: <a href="http://www.openbsd.org/cgi-bin/man.cgi?query=crypt&sektion=3">
1.125 deraadt 1209: crypt(3)</a>)
1.245 miod 1210: (patch included).
1.294 david 1211: <li><a href="errata26.html#procfs">Jan 20, 2000:
1.123 deraadt 1212: Systems running with procfs enabled and mounted are
1213: vulnerable to a very tricky exploit. procfs is not
1214: mounted by default.
1215: (patch included).</a>
1.294 david 1216: <li><a href="errata26.html#sendmail">Dec 4, 1999:
1.296 david 1217: Sendmail permitted any user to cause an aliases file wrap,
1.190 mpech 1218: thus exposing the system to a race where the aliases file
1219: did not exist.
1.119 deraadt 1220: (patch included).</a>
1.294 david 1221: <li><a href="errata26.html#poll">Dec 4, 1999:
1.190 mpech 1222: Various bugs in poll(2) may cause a kernel crash.</a>
1.294 david 1223: <li><a href="errata26.html#sslUSA">Dec 2, 1999:
1.120 deraadt 1224: A buffer overflow in the RSAREF code included in the
1225: USA version of libssl, is possibly exploitable in
1226: httpd, ssh, or isakmpd, if SSL/RSA features are enabled.
1.124 deraadt 1227: (patch included).<br></a>
1228: <strong>Update:</strong> Turns out that this was not exploitable
1229: in any of the software included in OpenBSD 2.6.
1.294 david 1230: <li><a href="errata26.html#ifmedia">Nov 9, 1999:
1.190 mpech 1231: Any user could change interface media configurations, resulting in
1232: a localhost denial of service attack.
1.121 deraadt 1233: (patch included).</a>
1.119 deraadt 1234: </ul>
1235:
1236: <p>
1237: <li>
1.288 matthieu 1238: <a name="25"></a>
1.106 deraadt 1239:
1.294 david 1240: <h3><font color="#e00000">OpenBSD 2.5 Security Advisories</font></h3>
1.93 deraadt 1241: These are the OpenBSD 2.5 advisories -- all these problems are solved
1.294 david 1242: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.93 deraadt 1243: OpenBSD 2.4 advisories listed below are fixed in OpenBSD 2.5.
1244:
1.96 deraadt 1245: <p>
1.104 deraadt 1246: <ul>
1.294 david 1247: <li><a href="errata25.html#cron">Aug 30, 1999:
1.103 deraadt 1248: In cron(8), make sure argv[] is NULL terminated in the
1249: fake popen() and run sendmail as the user, not as root.
1250: (patch included).</a>
1.294 david 1251: <li><a href="errata25.html#miscfs">Aug 12, 1999: The procfs and fdescfs
1.101 deraadt 1252: filesystems had an overrun in their handling of uio_offset
1253: in their readdir() routines. (These filesystems are not
1254: enabled by default). (patch included).</a>
1.294 david 1255: <li><a href="errata25.html#profil">Aug 9, 1999: Stop profiling (see profil(2))
1.100 deraadt 1256: when we execve() a new process. (patch included).</a>
1.294 david 1257: <li><a href="errata25.html#ipsec_in_use">Aug 6, 1999: Packets that should have
1.98 deraadt 1258: been handled by IPsec may be transmitted as cleartext.
1259: PF_KEY SA expirations may leak kernel resources.
1260: (patch included).</a>
1.294 david 1261: <li><a href="errata25.html#rc">Aug 5, 1999: In /etc/rc, use mktemp(1) for
1.97 deraadt 1262: motd re-writing and change the find(1) to use -execdir
1263: (patch included).</a>
1.294 david 1264: <li><a href="errata25.html#chflags">Jul 30, 1999: Do not permit regular
1.95 deraadt 1265: users to chflags(2) or fchflags(2) on character or block devices
1266: which they may currently be the owner of (patch included).</a>
1.294 david 1267: <li><a href="errata25.html#nroff">Jul 27, 1999: Cause groff(1) to be invoked
1.95 deraadt 1268: with the -S flag, when called by nroff(1) (patch included).</a>
1.93 deraadt 1269: </ul>
1270:
1.106 deraadt 1271: <p>
1272: <li>
1.288 matthieu 1273: <a name="24"></a>
1.235 miod 1274:
1.294 david 1275: <h3><font color="#e00000">OpenBSD 2.4 Security Advisories</font></h3>
1.75 deraadt 1276: These are the OpenBSD 2.4 advisories -- all these problems are solved
1.294 david 1277: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.75 deraadt 1278: OpenBSD 2.3 advisories listed below are fixed in OpenBSD 2.4.
1279:
1.96 deraadt 1280: <p>
1.75 deraadt 1281: <ul>
1.294 david 1282: <li><a href="errata24.html#poll">Mar 22, 1999: The nfds argument for poll(2) needs
1.91 deraadt 1283: to be constrained, to avoid kvm starvation (patch included).</a>
1.294 david 1284: <li><a href="errata24.html#tss">Mar 21, 1999: A change in TSS handling stops
1.91 deraadt 1285: another kernel crash case caused by the <strong>crashme</strong>
1286: program (patch included).</a>
1.294 david 1287: <li><a href="errata24.html#nlink">Feb 25, 1999: An unbounded increment on the
1.90 deraadt 1288: nlink value in FFS and EXT2FS filesystems can cause a system crash.
1.89 deraadt 1289: (patch included).</a>
1.294 david 1290: <li><a href="errata24.html#ping">Feb 23, 1999: Yet another buffer overflow
1.88 deraadt 1291: existed in ping(8). (patch included).</a>
1.294 david 1292: <li><a href="errata24.html#ipqrace">Feb 19, 1999: ipintr() had a race in use of
1.87 deraadt 1293: the ipq, which could permit an attacker to cause a crash.
1294: (patch included).</a>
1.294 david 1295: <li><a href="errata24.html#accept">Feb 17, 1999: A race condition in the
1.86 deraadt 1296: kernel between accept(2) and select(2) could permit an attacker
1297: to hang sockets from remote.
1298: (patch included).</a>
1.294 david 1299: <li><a href="errata24.html#maxqueue">Feb 17, 1999: IP fragment assembly can
1.85 deraadt 1300: bog the machine excessively and cause problems.
1301: (patch included).</a>
1.294 david 1302: <li><a href="errata24.html#trctrap">Feb 12, 1999: i386 T_TRCTRAP handling and
1.84 deraadt 1303: DDB interacted to possibly cause a crash.
1304: (patch included).</a>
1.294 david 1305: <li><a href="errata24.html#rst">Feb 11, 1999: TCP/IP RST handling was sloppy.
1.83 deraadt 1306: (patch included).</a>
1.294 david 1307: <li><a href="errata24.html#bootpd">Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 1308: problem in bootpd(8). (patch included).</a>
1.294 david 1309: <li><a href="errata24.html#termcap">Nov 19, 1998: There is a possibly locally
1.82 deraadt 1310: exploitable problem relating to environment variables in termcap
1311: and curses. (patch included).</a>
1.294 david 1312: <li><a href="errata24.html#tcpfix">Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 1313: bug in the TCP decoding kernel. (patch included).</a>
1.75 deraadt 1314: </ul>
1315:
1.106 deraadt 1316: <p>
1317: <li>
1.288 matthieu 1318: <a name="23"></a>
1.235 miod 1319:
1.294 david 1320: <h3><font color="#e00000">OpenBSD 2.3 Security Advisories</font></h3>
1.73 deraadt 1321: These are the OpenBSD 2.3 advisories -- all these problems are solved
1.294 david 1322: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.73 deraadt 1323: OpenBSD 2.2 advisories listed below are fixed in OpenBSD 2.3.
1.53 matthieu 1324:
1.96 deraadt 1325: <p>
1.53 matthieu 1326: <ul>
1.294 david 1327: <li><a href="errata23.html#bootpd">Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 1328: problem in bootpd(8). (patch included).</a>
1.294 david 1329: <li><a href="errata23.html#tcpfix">Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 1330: bug in the TCP decoding kernel. (patch included).</a>
1.294 david 1331: <li><a href="errata23.html#resolver">August 31, 1998: A benign looking resolver
1.190 mpech 1332: buffer overflow bug was re-introduced accidentally (patches included).</a>
1.294 david 1333: <li><a href="errata23.html#chpass">Aug 2, 1998:
1.190 mpech 1334: chpass(1) has a file descriptor leak which allows an
1335: attacker to modify /etc/master.passwd.</a>
1.294 david 1336: <li><a href="errata23.html#inetd">July 15, 1998: Inetd had a file descriptor leak.</a>
1337: <li><a href="errata23.html#fdalloc">Jul 2, 1998: setuid and setgid processes
1.72 deraadt 1338: should not be executed with fd slots 0, 1, or 2 free.
1339: (patch included).</a>
1.294 david 1340: <li><a href="errata23.html#xlib">June 6, 1998: Further problems with the X
1.71 deraadt 1341: libraries (patches included).</a>
1.294 david 1342: <li><a href="errata23.html#kill">May 17, 1998: kill(2) of setuid/setgid target
1.66 deraadt 1343: processes too permissive (4th revision patch included).</a>
1.294 david 1344: <li><a href="errata23.html#immutable">May 11, 1998: mmap() permits partial bypassing
1.60 deraadt 1345: of immutable and append-only file flags. (patch included).</a>
1.294 david 1346: <li><a href="errata23.html#ipsec">May 5, 1998: Incorrect handling of IPSEC packets
1.190 mpech 1347: if IPSEC is enabled (patch included).</a>
1.294 david 1348: <li><a href="errata23.html#xterm-xaw">May 1, 1998: Buffer overflow in xterm and Xaw
1.58 deraadt 1349: (CERT advisory VB-98.04) (patch included).</a>
1.53 matthieu 1350: </ul>
1.9 deraadt 1351:
1.106 deraadt 1352: <p>
1353: <li>
1.288 matthieu 1354: <a name="22"></a>
1.235 miod 1355:
1.294 david 1356: <h3><font color="#e00000">OpenBSD 2.2 Security Advisories</font></h3>
1.45 deraadt 1357: These are the OpenBSD 2.2 advisories. All these problems are solved
1.294 david 1358: in <a href="23.html">OpenBSD 2.3</a>. Some of these problems
1.45 deraadt 1359: still exist in other operating systems. (The supplied patches are for
1360: OpenBSD 2.2; they may or may not work on OpenBSD 2.1).
1.9 deraadt 1361:
1.96 deraadt 1362: <p>
1.9 deraadt 1363: <ul>
1.294 david 1364: <li><a href="errata22.html#ipsec">May 5, 1998: Incorrect handling of IPSEC
1.72 deraadt 1365: packets if IPSEC is enabled (patch included).</a>
1.294 david 1366: <li><a href="errata22.html#xterm-xaw">May 1, 1998: Buffer overflow in xterm
1.72 deraadt 1367: and Xaw (CERT advisory VB-98.04) (patch included).</a>
1.294 david 1368: <li><a href="errata22.html#uucpd">Apr 22, 1998: Buffer overflow in uucpd
1.72 deraadt 1369: (patch included).</a>
1.294 david 1370: <li><a href="errata22.html#rmjob">Apr 22, 1998: Buffer mismanagement in lprm
1.72 deraadt 1371: (patch included).</a>
1.294 david 1372: <li><a href="errata22.html#ping">Mar 31, 1998: Overflow in ping -R (patch included).</a>
1373: <li><a href="errata22.html#named">Mar 30, 1998: Overflow in named fake-iquery
1.59 deraadt 1374: (patch included).</a>
1.294 david 1375: <li><a href="errata22.html#mountd">Mar 2, 1998: Accidental NFS filesystem
1.72 deraadt 1376: export (patch included).</a>
1.112 philen 1377: <li><a href="advisories/mmap.txt">Feb 26, 1998: Read-write mmap() flaw.</a>
1.294 david 1378: Revision 3 of the patch is available <a href="errata22.html#mmap">here</a>
1.112 philen 1379: <li><a href="advisories/sourceroute.txt">Feb 19, 1998: Sourcerouted Packet
1.59 deraadt 1380: Acceptance.</a>
1.294 david 1381: A patch is available <a href="errata22.html#sourceroute">here</a>.
1382: <li><a href="errata22.html#ruserok">Feb 13, 1998: Setuid coredump & Ruserok()
1.72 deraadt 1383: flaw (patch included).</a>
1.294 david 1384: <li><a href="errata22.html#ldso">Feb 9, 1998: MIPS ld.so flaw (patch included).</a>
1.1 deraadt 1385: </ul>
1386:
1.106 deraadt 1387: <p>
1388: <li>
1.288 matthieu 1389: <a name="21"></a>
1.235 miod 1390:
1.294 david 1391: <h3><font color="#e00000">OpenBSD 2.1 Security Advisories</font></h3>
1.52 deraadt 1392: These are the OpenBSD 2.1 advisories. All these problems are solved
1.294 david 1393: in <a href="22.html">OpenBSD 2.2</a>. Some of these problems still
1.52 deraadt 1394: exist in other operating systems. (If you are running OpenBSD 2.1, we
1395: would strongly recommend an upgrade to the newest release, as this
1396: patch list only attempts at fixing the most important security
1397: problems. In particular, OpenBSD 2.2 fixes numerous localhost
1398: security problems. Many of those problems were solved in ways which
1399: make it hard for us to provide patches).
1400:
1.96 deraadt 1401: <p>
1.52 deraadt 1402: <ul>
1.112 philen 1403: <li><a href="advisories/signals.txt">Sep 15, 1997: Deviant Signals (patch included)</a>
1404: <li><a href="advisories/rfork.txt">Aug 2, 1997: Rfork() system call flaw
1.59 deraadt 1405: (patch included)</a>
1.112 philen 1406: <li><a href="advisories/procfs.txt">Jun 24, 1997: Procfs flaws (patch included)</a>
1.52 deraadt 1407: </ul>
1.51 deraadt 1408:
1.106 deraadt 1409: <p>
1410: <li>
1.288 matthieu 1411: <a name="20"></a>
1.235 miod 1412:
1.294 david 1413: <h3><font color="#e00000">OpenBSD 2.0 Security Advisories</font></h3>
1.99 deraadt 1414: These are the OpenBSD 2.0 advisories. All these problems are solved
1.294 david 1415: in <a href="21.html">OpenBSD 2.1</a>. Some of these problems still
1.99 deraadt 1416: exist in other operating systems. (If you are running OpenBSD 2.0, we
1417: commend you for being there back in the old days!, but you're really
1418: missing out if you don't install a new version!)
1419:
1420: <p>
1421: <ul>
1.112 philen 1422: <li><a href="advisories/res_random.txt">April 22, 1997: Predictable IDs in the
1.99 deraadt 1423: resolver (patch included)</a>
1424: <li>Many others... if people can hunt them down, please let me know
1425: and we'll put them up here.
1426: </ul>
1.51 deraadt 1427: <p>
1.106 deraadt 1428:
1.288 matthieu 1429: <a name="watching"></a>
1.294 david 1430: <li><h3><font color="#e00000">Watching our Changes</font></h3><p>
1.106 deraadt 1431:
1.21 deraadt 1432: Since we take a proactive stance with security, we are continually
1433: finding and fixing new security problems. Not all of these problems
1.80 espie 1434: get widely reported because (as stated earlier) many of them are not
1.45 deraadt 1435: confirmed to be exploitable; many simple bugs we fix do turn out to
1436: have security consequences we could not predict. We do not have the
1437: time resources to make these changes available in the above format.<p>
1.21 deraadt 1438:
1439: Thus there are usually minor security fixes in the current source code
1440: beyond the previous major OpenBSD release. We make a limited
1.45 deraadt 1441: guarantee that these problems are of minimal impact and unproven
1.44 ian 1442: exploitability. If we discover that a problem definitely matters for
1.45 deraadt 1443: security, patches will show up here <strong>VERY</strong> quickly.<p>
1.21 deraadt 1444:
1.45 deraadt 1445: People who are really concerned with security can do a number of
1446: things:<p>
1.21 deraadt 1447:
1448: <ul>
1449: <li>If you understand security issues, watch our
1.294 david 1450: <a href="mail.html">source-changes mailing list</a> and keep an
1.23 deraadt 1451: eye out for things which appear security related. Since
1.21 deraadt 1452: exploitability is not proven for many of the fixes we make,
1453: do not expect the relevant commit message to say "SECURITY FIX!".
1454: If a problem is proven and serious, a patch will be available
1455: here very shortly after.
1.161 horacio 1456: <li>In addition to source changes, you can watch our <a href="mail.html">
1.160 ericj 1457: security-announce mailing list</a> which will notify you for every
1.186 ian 1458: security related item that the OpenBSD team deems as a possible threat,
1.160 ericj 1459: and instruct you on how to patch the problem.
1.21 deraadt 1460: <li>Track our current source code tree, and teach yourself how to do a
1.29 deraadt 1461: complete system build from time to time (read /usr/src/Makefile
1462: carefully). Users can make the assumption that the current
1463: source tree always has stronger security than the previous release.
1.45 deraadt 1464: However, building your own system from source code is not trivial;
1.265 miod 1465: it is nearly 600MB of source code, and problems do occur as we
1.45 deraadt 1466: transition between major releases.
1.115 ericj 1467: <li>Install a binary snapshot for your
1.80 espie 1468: architecture, which are made available fairly often. For
1.29 deraadt 1469: instance, an i386 snapshot is typically made available weekly.
1.21 deraadt 1470: </ul>
1471:
1.9 deraadt 1472: <p>
1.288 matthieu 1473: <a name="reporting"></a>
1.294 david 1474: <li><h3><font color="#e00000">Reporting problems</font></h3><p>
1.3 deraadt 1475:
1.5 deraadt 1476: <p> If you find a new security problem, you can mail it to
1.294 david 1477: <a href="mailto:deraadt@openbsd.org">deraadt@openbsd.org</a>.
1.7 deraadt 1478: <br>
1.5 deraadt 1479: If you wish to PGP encode it (but please only do so if privacy is very
1.112 philen 1480: urgent, since it is inconvenient) use this <a href="advisories/pgpkey.txt">pgp key</a>.
1.5 deraadt 1481:
1.107 deraadt 1482: <p>
1.288 matthieu 1483: <a name="papers"></a>
1.294 david 1484: <li><h3><font color="#e00000">Further Reading</font></h3><p>
1.107 deraadt 1485:
1486: A number of papers have been written by OpenBSD team members, about security
1487: related changes they have done in OpenBSD. The postscript versions of these
1.108 deraadt 1488: documents are available as follows.<p>
1.107 deraadt 1489:
1490: <ul>
1.113 deraadt 1491: <li>A Future-Adaptable Password Scheme.<br>
1.294 david 1492: <a href="events.html#usenix99">Usenix 1999</a>,
1493: by <a href="mailto:provos@openbsd.org">Niels Provos</a>,
1494: <a href="mailto:dm@openbsd.org">David Mazieres</a>.<br>
1495: <a href="papers/bcrypt-paper.ps">paper</a> and
1496: <a href="papers/bcrypt-slides.ps">slides</a>.
1.113 deraadt 1497: <p>
1498: <li>Cryptography in OpenBSD: An Overview.<br>
1.294 david 1499: <a href="events.html#usenix99">Usenix 1999</a>,
1500: by <a href="mailto:deraadt@openbsd.org">Theo de Raadt</a>,
1501: <a href="mailto:niklas@openbsd.org">Niklas Hallqvist</a>,
1502: <a href="mailto:art@openbsd.org">Artur Grabowski</a>,
1503: <a href="mailto:angelos@openbsd.org">Angelos D. Keromytis</a>,
1504: <a href="mailto:provos@openbsd.org">Niels Provos</a>.<br>
1505: <a href="papers/crypt-paper.ps">paper</a> and
1506: <a href="papers/crypt-slides.ps">slides</a>.
1.113 deraadt 1507: <p>
1508: <li>strlcpy and strlcat -- consistent, safe, string copy and concatenation.<br>
1.294 david 1509: <a href="events.html#usenix99">Usenix 1999</a>,
1510: by <a href="mailto:millert@openbsd.org">Todd C. Miller</a>,
1511: <a href="mailto:deraadt@openbsd.org">Theo de Raadt</a>.<br>
1512: <a href="papers/strlcpy-paper.ps">paper</a> and
1513: <a href="papers/strlcpy-slides.ps">slides</a>.
1.113 deraadt 1514: <p>
1.118 deraadt 1515: <li>Dealing with Public Ethernet Jacks-Switches, Gateways, and Authentication.<br>
1.294 david 1516: <a href="events.html#lisa99">LISA 1999</a>,
1517: by <a href="mailto:beck@openbsd.org">Bob Beck</a>.<br>
1518: <a href="papers/authgw-paper.ps">paper</a> and
1519: <a href="papers/authgw-slides.ps">slides</a>.
1.118 deraadt 1520: <p>
1.153 jufi 1521: <li>Encrypting Virtual Memory<br>
1.294 david 1522: <a href="events.html#sec2000">Usenix Security 2000</a>,
1523: <a href="mailto:provos@openbsd.org">Niels Provos</a>.<br>
1524: <a href="papers/swapencrypt.ps">paper</a> and
1525: <a href="papers/swapencrypt-slides.ps">slides</a>.
1.142 deraadt 1526: <p>
1.107 deraadt 1527: </ul>
1.294 david 1528: </ul>
1.106 deraadt 1529:
1.2 deraadt 1530: <hr>
1.294 david 1531: <a href="index.html"><img height=24 width=24 src="back.gif" border=0 alt="OpenBSD"></a>
1532: <a href="mailto:www@openbsd.org">www@openbsd.org</a>
1.24 deraadt 1533: <br>
1.335 ! deraadt 1534: <small>$OpenBSD: security.html,v 1.334 2006/11/04 03:02:28 brad Exp $</small>
1.1 deraadt 1535:
1.24 deraadt 1536: </body>
1537: </html>
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