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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>
1.338 ! miod 236: <li><a href="errata.html#agp">Jan 3, 2007:
! 237: Insufficient validation in vga(4) may allow an attacker to gain
! 238: root privileges on some i386 systems.</a>
1.336 brad 239: <li><a href="errata.html#ldso">Nov 19, 2006:
1.337 deraadt 240: ld.so(1) fails to properly sanitize the environment.</a>
1.335 deraadt 241: <li><a href="errata.html#systrace">Nov 4, 2006:
1.334 brad 242: Fix for an integer overflow in systrace(4)'s STRIOCREPLACE support,
243: found by Chris Evans.</a>
1.335 deraadt 244: <li><a href="errata.html#openssl">Nov 4, 2006:
1.334 brad 245: Several problems have been found in OpenSSL.</a>
1.335 deraadt 246: <li><a href="errata.html#httpd">Nov 4, 2006:
1.334 brad 247: httpd(8) does not sanitize the Expect header from an HTTP request
248: when it is reflected back in an error message, which might allow
249: cross-site scripting (XSS) style attacks.</a>
250: </ul>
251:
252: <li>
1.321 brad 253: <a name="39"></a>
254:
255: <h3><font color="#e00000">OpenBSD 3.9 Security Advisories</font></h3>
256: These are the OpenBSD 3.9 advisories -- all these problems are solved
257: in <a href=anoncvs.html>OpenBSD current</a> and the
258: <a href=stable.html>patch branch</a>.
259:
260: <p>
261: <ul>
1.338 ! miod 262: <li><a href="errata39.html#agp">Jan 3, 2007:
! 263: Insufficient validation in vga(4) may allow an attacker to gain
! 264: root privileges on some i386 systems.</a>
1.336 brad 265: <li><a href="errata39.html#ldso">Nov 19, 2006:
1.337 deraadt 266: ld.so(1) fails to properly sanitize the environment.</a>
1.333 deraadt 267: <li><a href="errata39.html#ssh">Oct 12, 2006:
1.332 brad 268: Fix 2 security bugs found in OpenSSH.</a>
1.333 deraadt 269: <li><a href="errata39.html#systrace">Oct 7, 2006:
1.331 brad 270: Fix for an integer overflow in systrace(4)'s STRIOCREPLACE support,
1.330 brad 271: found by Chris Evans.</a>
1.333 deraadt 272: <li><a href="errata39.html#openssl2">Oct 7, 2006:
1.330 brad 273: Several problems have been found in OpenSSL.</a>
1.333 deraadt 274: <li><a href="errata39.html#httpd2">Oct 7, 2006:
1.330 brad 275: httpd(8) does not sanitize the Expect header from an HTTP request
276: when it is reflected back in an error message, which might allow
277: cross-site scripting (XSS) style attacks.</a>
1.333 deraadt 278: <li><a href="errata39.html#openssl">Sep 8, 2006:
1.329 brad 279: Due to incorrect PKCS#1 v1.5 padding validation in OpenSSL, it is
280: possible for an attacker to construct an invalid signature which
281: OpenSSL would accept as a valid PKCS#1 v1.5 signature.</a>
1.333 deraadt 282: <li><a href="errata39.html#bind">Sep 8, 2006:
1.328 brad 283: Two Denial of Service issues have been found with BIND.</a>
1.333 deraadt 284: <li><a href="errata39.html#sppp">Sep 2, 2006:
1.327 brad 285: Due to the failure to correctly validate LCP configuration option
286: lengths, it is possible for an attacker to send LCP packets via an
287: sppp(4) connection causing the kernel to panic.</a>
1.333 deraadt 288: <li><a href="errata39.html#isakmpd">Aug 25, 2006:
1.326 brad 289: A problem in isakmpd(8) caused IPsec to run partly without replay
290: protection.</a>
1.333 deraadt 291: <li><a href="errata39.html#sem">Aug 25, 2006:
1.326 brad 292: It is possible to cause the kernel to panic when more than the default
293: number of sempahores have been allocated.</a>
1.333 deraadt 294: <li><a href="errata39.html#dhcpd">Aug 25, 2006:
1.326 brad 295: Due to an off-by-one error in dhcpd(8) it is possible to cause dhcpd(8)
296: to exit by sending a DHCPDISCOVER packet with a 32-byte client identifier
297: option.</a>
1.333 deraadt 298: <li><a href="errata39.html#sendmail3">Aug 25, 2006:
1.326 brad 299: A potential denial of service problem has been found in sendmail.</a>
1.333 deraadt 300: <li><a href="errata39.html#httpd">Jul 30, 2006:
1.325 brad 301: httpd(8)'s mod_rewrite has a potentially exploitable off-by-one buffer
302: overflow.</a>
1.333 deraadt 303: <li><a href="errata39.html#sendmail2">Jun 15, 2006:
1.324 brad 304: A potential denial of service problem has been found in sendmail.</a>
1.333 deraadt 305: <li><a href="errata39.html#xorg">May 2, 2006:
1.322 brad 306: A buffer overflow exists in the Render extension of the X server.</a>
1.333 deraadt 307: <li><a href="errata39.html#sendmail">Mar 25, 2006:
1.321 brad 308: A race condition has been reported to exist in the handling by sendmail
309: of asynchronous signals.</a>
310: </ul>
311:
1.338 ! miod 312: <p>
! 313: OpenBSD 3.8 and earlier releases are not supported anymore. The following
! 314: paragraphs only list advisories issued while they were maintained; these
! 315: releases are likely to be affected by the advisories for more recent releases.
! 316: <br>
! 317:
1.321 brad 318: <li>
1.318 deraadt 319: <a name="38"></a>
320:
321: <h3><font color="#e00000">OpenBSD 3.8 Security Advisories</font></h3>
322: These are the OpenBSD 3.8 advisories -- all these problems are solved
323: in <a href=anoncvs.html>OpenBSD current</a> and the
324: <a href=stable.html>patch branch</a>.
325:
326: <p>
327: <ul>
1.332 brad 328: <li><a href="errata38.html#ssh2">Oct 12, 2006:
329: Fix 2 security bugs found in OpenSSH.</a>
1.330 brad 330: <li><a href="errata38.html#systrace">Oct 7, 2006:
1.331 brad 331: Fix for an integer overflow in systrace(4)'s STRIOCREPLACE support,
1.330 brad 332: found by Chris Evans.</a>
333: <li><a href="errata38.html#openssl2">Oct 7, 2006:
334: Several problems have been found in OpenSSL.</a>
335: <li><a href="errata38.html#httpd2">Oct 7, 2006:
336: httpd(8) does not sanitize the Expect header from an HTTP request
337: when it is reflected back in an error message, which might allow
338: cross-site scripting (XSS) style attacks.</a>
1.329 brad 339: <li><a href="errata38.html#openssl">Sep 8, 2006:
340: Due to incorrect PKCS#1 v1.5 padding validation in OpenSSL, it is
341: possible for an attacker to construct an invalid signature which
342: OpenSSL would accept as a valid PKCS#1 v1.5 signature.</a>
1.328 brad 343: <li><a href="errata38.html#bind">Sep 8, 2006:
344: Two Denial of Service issues have been found with BIND.</a>
1.327 brad 345: <li><a href="errata38.html#sppp">Sep 2, 2006:
346: Due to the failure to correctly validate LCP configuration option
347: lengths, it is possible for an attacker to send LCP packets via an
348: sppp(4) connection causing the kernel to panic.</a>
1.326 brad 349: <li><a href="errata38.html#isakmpd">Aug 25, 2006:
350: A problem in isakmpd(8) caused IPsec to run partly without replay
351: protection.</a>
352: <li><a href="errata38.html#sem">Aug 25, 2006:
353: It is possible to cause the kernel to panic when more than the default
354: number of sempahores have been allocated.</a>
355: <li><a href="errata38.html#dhcpd">Aug 25, 2006:
356: Due to an off-by-one error in dhcpd(8) it is possible to cause dhcpd(8)
357: to exit by sending a DHCPDISCOVER packet with a 32-byte client identifier
358: option.</a>
359: <li><a href="errata38.html#sendmail3">Aug 25, 2006:
360: A potential denial of service problem has been found in sendmail.</a>
1.325 brad 361: <li><a href="errata38.html#httpd">Jul 30, 2006:
362: httpd(8)'s mod_rewrite has a potentially exploitable off-by-one buffer
363: overflow.</a>
1.324 brad 364: <li><a href="errata38.html#sendmail2">Jun 15, 2006:
365: A potential denial of service problem has been found in sendmail.</a>
1.322 brad 366: <li><a href="errata38.html#xorg">May 2, 2006:
367: A buffer overflow exists in the Render extension of the X server.</a>
1.321 brad 368: <li><a href="errata38.html#sendmail">Mar 25, 2006:
369: A race condition has been reported to exist in the handling by sendmail
370: of asynchronous signals.</a>
371: <li><a href="errata38.html#ssh">Feb 12, 2006:
1.320 brad 372: Josh Bressers has reported a weakness in OpenSSH caused due to the
373: insecure use of the system(3) function in scp(1) when performing copy
374: operations using filenames that are supplied by the user from the
375: command line.</a>
1.321 brad 376: <li><a href="errata38.html#fd">Jan 5, 2006:
1.319 brad 377: Do not allow users to trick suid programs into re-opening files via
378: /dev/fd.</a>
1.321 brad 379: <li><a href="errata38.html#perl">Jan 5, 2006:
1.319 brad 380: A buffer overflow has been found in the Perl interpreter with the
381: sprintf function which may be exploitable under certain conditions.</a>
1.318 deraadt 382: </ul>
383:
384: <li>
1.312 david 385: <a name="37"></a>
386:
387: <h3><font color="#e00000">OpenBSD 3.7 Security Advisories</font></h3>
388: These are the OpenBSD 3.7 advisories -- all these problems are solved
1.323 steven 389: in <a href="anoncvs.html">OpenBSD current</a>. The
390: <a href="stable.html">patch branch</a> for 3.7 is no longer being maintained,
391: you should update your machine.
1.312 david 392:
393: <p>
394: <ul>
1.322 brad 395: <li><a href="errata37.html#xorg">May 2, 2006:
396: A buffer overflow exists in the Render extension of the X server.</a>
1.321 brad 397: <li><a href="errata37.html#sendmail">Mar 25, 2006:
398: A race condition has been reported to exist in the handling by sendmail
399: of asynchronous signals.</a>
1.320 brad 400: <li><a href="errata37.html#ssh">Feb 12, 2006:
401: Josh Bressers has reported a weakness in OpenSSH caused due to the
402: insecure use of the system(3) function in scp(1) when performing copy
403: operations using filenames that are supplied by the user from the
404: command line.</a>
1.319 brad 405: <li><a href="errata37.html#fd">Jan 5, 2006:
406: Do not allow users to trick suid programs into re-opening files via
407: /dev/fd.</a>
408: <li><a href="errata37.html#perl">Jan 5, 2006:
409: A buffer overflow has been found in the Perl interpreter with the
410: sprintf function which may be exploitable under certain conditions.</a>
1.318 deraadt 411: <li><a href="errata37.html#libz2">Jul 21, 2005:
1.317 millert 412: Fix another buffer overflow in the zlib library that may be exploitable.</a>
1.318 deraadt 413: <li><a href="errata37.html#libz">Jul 6, 2005:
1.316 millert 414: Fix a buffer overflow in the zlib library that may be exploitable.</a>
1.318 deraadt 415: <li><a href="errata37.html#sudo">Jun 20, 2005:
1.316 millert 416: Fix a race condition in sudo(8) that could allow a user
1.315 millert 417: to run arbitrary commands.</a>
1.318 deraadt 418: <li><a href="errata37.html#cvs">Jun 7, 2005:
1.313 brad 419: Fix a buffer overflow, memory leaks, and NULL pointer
420: dereference in cvs(1).</a>
1.312 david 421: </ul>
422:
423: <li>
1.301 miod 424: <a name="36"></a>
425:
426: <h3><font color="#e00000">OpenBSD 3.6 Security Advisories</font></h3>
427: These are the OpenBSD 3.6 advisories -- all these problems are solved
1.323 steven 428: in <a href="anoncvs.html">OpenBSD current</a>. The
429: <a href="stable.html">patch branch</a> for 3.6 is no longer being maintained,
430: you should update your machine.
1.301 miod 431:
432: <p>
1.302 markus 433: <ul>
1.317 millert 434: <li><a href="errata36.html#libz2">Jul 21, 2005:
435: Fix another buffer overflow in the zlib library that may be exploitable.</a>
1.316 millert 436: <li><a href="errata36.html#libz">Jul 6, 2005:
437: Fix a buffer overflow in the zlib library that may be exploitable.</a>
1.315 millert 438: <li><a href="errata36.html#sudo">Jun 20, 2005:
1.316 millert 439: Fix a race condition in sudo(8) that could allow a user
1.315 millert 440: to run arbitrary commands.</a>
1.311 deraadt 441: <li><a href="errata36.html#cvs">Apr 28, 2005:
1.310 brad 442: Fix a buffer overflow, memory leaks, and NULL pointer
443: dereference in cvs(1).</a>
1.311 deraadt 444: <li><a href="errata36.html#telnet">Mar 30, 2005:
1.309 brad 445: Due to buffer overflows in telnet(1), a malicious
446: server or man-in-the-middle attack could allow
447: execution of arbitrary code with the privileges of
448: the user invoking telnet(1).</a>
1.311 deraadt 449: <li><a href="errata36.html#copy">Mar 16, 2005:
1.307 brad 450: More stringent checking should be done in the copy(9)
451: functions to prevent their misuse.</a>
1.311 deraadt 452: <li><a href="errata36.html#locore">Feb 28, 2005:
1.306 brad 453: More stringent checking should be done in the copy(9)
454: functions to prevent their misuse.</a>
1.311 deraadt 455: <li><a href="errata36.html#httpd">Jan 12, 2005:
1.304 brad 456: httpd(8)'s mod_include module fails to properly validate
457: the length of user supplied tag strings prior to copying
1.305 brad 458: them to a local buffer, causing a buffer overflow.</a>
1.311 deraadt 459: <li><a href="errata36.html#pfkey">Dec 14, 2004:
1.302 markus 460: On systems running isakmpd(8) it is possible for a local
461: user to cause kernel memory corruption and system panic by
1.303 markus 462: setting ipsec(4) credentials on a socket.</a>
1.302 markus 463: </ul>
1.301 miod 464:
465: <li>
1.288 matthieu 466: <a name="35"></a>
1.279 deraadt 467:
1.294 david 468: <h3><font color="#e00000">OpenBSD 3.5 Security Advisories</font></h3>
1.279 deraadt 469: These are the OpenBSD 3.5 advisories -- all these problems are solved
1.314 miod 470: in <a href="anoncvs.html">OpenBSD current</a>. The
471: <a href="stable.html">patch branch</a> for 3.5 is no longer being maintained,
472: you should update your machine.
1.279 deraadt 473:
474: <p>
475: <ul>
1.310 brad 476: <li><a href="errata35.html#cvs4">Apr 28, 2005:
477: Fix a buffer overflow, memory leaks, and NULL pointer
478: dereference in cvs(1).</a>
1.309 brad 479: <li><a href="errata35.html#telnet">Mar 30, 2005:
480: Due to buffer overflows in telnet(1), a malicious
481: server or man-in-the-middle attack could allow
482: execution of arbitrary code with the privileges of
483: the user invoking telnet(1).</a>
1.308 brad 484: <li><a href="errata35.html#copy">Mar 16, 2005:
1.307 brad 485: More stringent checking should be done in the copy(9)
486: functions to prevent their misuse.</a>
1.306 brad 487: <li><a href="errata35.html#locore">Feb 28, 2005:
488: More stringent checking should be done in the copy(9)
489: functions to prevent their misuse.</a>
1.304 brad 490: <li><a href="errata35.html#httpd3">Jan 12, 2005:
491: httpd(8)'s mod_include module fails to properly validate
492: the length of user supplied tag strings prior to copying
1.305 brad 493: them to a local buffer, causing a buffer overflow.</a>
1.302 markus 494: <li><a href="errata35.html#pfkey">Dec 14, 2004:
495: On systems running isakmpd(8) it is possible for a local
496: user to cause kernel memory corruption and system panic by
1.303 markus 497: setting ipsec(4) credentials on a socket.</a>
1.301 miod 498: <li><a href="errata35.html#radius">Sep 20, 2004:
1.299 millert 499: Radius-based authentication is vulnerable to spoofed replies.</a>
1.301 miod 500: <li><a href="errata35.html#xpm">Sep 16, 2004:
1.298 brad 501: The Xpm library has vulnerabilities when parsing malicious images.</a>
1.301 miod 502: <li><a href="errata35.html#httpd2"> Sep 10, 2004:
1.297 brad 503: httpd(8)'s mod_rewrite module can be made to write one zero byte in
504: an arbitrary memory position outside of a char array, causing a DoS
505: or possibly buffer overflows.</a>
1.301 miod 506: <li><a href="errata35.html#httpd"> Jun 12, 2004:
1.300 deraadt 507: Multiple vulnerabilities have been found in httpd(8) / mod_ssl.</a>
1.301 miod 508: <li><a href="errata35.html#isakmpd"> Jun 10, 2004:
1.291 hshoexer 509: isakmpd(8) still has issues with unauthorized SA deletion,
1.293 brad 510: an attacker can delete IPsec tunnels at will.</a>
1.301 miod 511: <li><a href="errata35.html#cvs3"> Jun 9, 2004:
1.290 millert 512: Multiple remote vulnerabilities have been found in the cvs(1)
513: server which can be used by CVS clients to crash or execute
1.293 brad 514: arbitrary code on the server.</a>
1.301 miod 515: <li><a href="errata35.html#kerberos"> May 30, 2004:
1.289 beck 516: kdc(8) performs inadequate checking of request fields, leading
517: to the possibility of principal impersonation from other
518: Kerberos realms if they are trusted with a cross-realm trust.</a>
1.301 miod 519: <li><a href="errata35.html#xdm"> May 26, 2004:
1.287 matthieu 520: xdm(1) ignores the requestPort resource and creates a
1.293 brad 521: listening socket regardless of the setting in xdm-config.</a>
1.301 miod 522: <li><a href="errata35.html#cvs2"> May 20, 2004:
1.286 otto 523: A buffer overflow in the cvs(1) server has been found,
524: which can be used by CVS clients to execute arbitrary code on
1.293 brad 525: the server.</a>
1.301 miod 526: <li><a href="errata35.html#procfs"> May 13, 2004:
1.282 tedu 527: Integer overflow problems were found in procfs, allowing
1.293 brad 528: reading of arbitrary kernel memory.</a>
1.301 miod 529: <li><a href="errata35.html#cvs"> May 5, 2004:
1.281 otto 530: Pathname validation problems have been found in cvs(1),
531: allowing clients and servers access to files outside the
1.293 brad 532: repository or local CVS tree.</a>
1.279 deraadt 533: </ul>
534:
535: <p>
536: <li>
1.288 matthieu 537: <a name="34"></a>
1.261 david 538:
1.294 david 539: <h3><font color="#e00000">OpenBSD 3.4 Security Advisories</font></h3>
1.261 david 540: These are the OpenBSD 3.4 advisories -- all these problems are solved
1.301 miod 541: in <a href="anoncvs.html">OpenBSD current</a>. The
542: <a href="stable.html">patch branch</a> for 3.4 is no longer being maintained,
543: you should update your machine.
1.261 david 544: <p>
545: <ul>
1.302 markus 546: <li><a href="errata34.html#pfkey">Dec 14, 2004:
547: On systems running isakmpd(8) it is possible for a local
548: user to cause kernel memory corruption and system panic by
1.303 markus 549: setting ipsec(4) credentials on a socket.</a>
1.298 brad 550: <li><a href="errata34.html#xpm">Sep 16, 2004:
551: The Xpm library has vulnerabilities when parsing malicious images.</a>
1.297 brad 552: <li><a href="errata34.html#httpd4"> Sep 10, 2004:
553: httpd(8)'s mod_rewrite module can be made to write one zero byte in
554: an arbitrary memory position outside of a char array, causing a DoS
555: or possibly buffer overflows.</a>
1.294 david 556: <li><a href="errata34.html#httpd3"> Jun 12, 2004:
1.300 deraadt 557: Multiple vulnerabilities have been found in httpd(8) / mod_ssl.</a>
1.294 david 558: <li><a href="errata34.html#isakmpd3"> Jun 10, 2004:
1.292 brad 559: isakmpd(8) still has issues with unauthorized SA deletion,
1.293 brad 560: an attacker can delete IPsec tunnels at will.</a>
1.294 david 561: <li><a href="errata34.html#cvs3"> Jun 9, 2004:
1.290 millert 562: Multiple remote vulnerabilities have been found in the cvs(1)
563: server which can be used by CVS clients to crash or execute
1.293 brad 564: arbitrary code on the server.</a>
1.294 david 565: <li><a href="errata34.html#kerberos"> May 30, 2004:
1.289 beck 566: kdc(8) performs inadequate checking of request fields, leading
567: to the possibility of principal impersonation from other
568: Kerberos realms if they are trusted with a cross-realm trust.</a>
1.294 david 569: <li><a href="errata34.html#cvs2"> May 20, 2004:
1.286 otto 570: A buffer overflow in the cvs(1) server has been found,
571: which can be used by CVS clients to execute arbitrary code on
572: the server.</a>
1.294 david 573: <li><a href="errata34.html#procfs"> May 13, 2004:
1.282 tedu 574: Integer overflow problems were found in procfs, allowing
575: reading of arbitrary kernel memory.</a>
1.294 david 576: <li><a href="errata34.html#cvs"> May 5, 2004:
1.281 otto 577: Pathname validation problems have been found in cvs(1),
578: allowing clients and servers access to files outside the
579: repository or local CVS tree.</a>
1.294 david 580: <li><a href="errata34.html#openssl"> March 17, 2004:
1.277 millert 581: A missing check for a NULL-pointer dereference may allow a
1.281 otto 582: remote attacker to crash applications using OpenSSL.</a>
1.294 david 583: <li><a href="errata34.html#isakmpd2"> March 17, 2004:
1.276 brad 584: Defects in the payload validation and processing functions of
585: isakmpd have been discovered. An attacker could send malformed
586: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.294 david 587: <li><a href="errata34.html#httpd2"> March 13, 2004:
1.275 brad 588: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
589: access module, using IP addresses without a netmask on big endian
590: 64-bit platforms causes the rules to fail to match.</a>
1.294 david 591: <li><a href="errata34.html#ip6"> February 8, 2004:
1.272 dhartmei 592: An IPv6 MTU handling problem exists that could be used by an
593: attacker to cause a denial of service attack.</a>
1.294 david 594: <li><a href="errata34.html#sysvshm"> February 5, 2004:
1.271 millert 595: A reference counting bug in shmat(2) could be used to write to
596: kernel memory under certain circumstances.</a>
1.294 david 597: <li><a href="errata34.html#isakmpd">January 13, 2004:
1.266 brad 598: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 599: by Thomas Walpuski.</a>
1.294 david 600: <li><a href="errata34.html#ibcs2">November 17, 2003:
1.264 henning 601: It may be possible for a local user to overrun the stack in
602: compat_ibcs2(8) and cause a kernel panic.</a>
1.294 david 603: <li><a href="errata34.html#asn1">November 1, 2003:
1.262 margarid 604: The use of certain ASN.1 encodings or malformed public keys may
605: allow an attacker to mount a denial of service attack against
606: applications linked with ssl(3).</a>
1.261 david 607: </ul>
608:
609: <li>
1.288 matthieu 610: <a name="33"></a>
1.246 deraadt 611:
1.294 david 612: <h3><font color="#e00000">OpenBSD 3.3 Security Advisories</font></h3>
1.246 deraadt 613: These are the OpenBSD 3.3 advisories -- all these problems are solved
1.294 david 614: in <a href="anoncvs.html">OpenBSD current</a>. The
615: <a href="stable.html">patch branch</a> for 3.3 is no longer being maintained,
1.284 otto 616: you should update your machine.
1.246 deraadt 617: <p>
618: <ul>
1.294 david 619: <li><a href="errata33.html#cvs"> May 5, 2004:
1.281 otto 620: Pathname validation problems have been found in cvs(1),
621: allowing clients and servers access to files outside the
622: repository or local CVS tree.</a>
1.294 david 623: <li><a href="errata33.html#openssl"> March 17, 2004:
1.277 millert 624: A missing check for a NULL-pointer dereference may allow a
1.281 otto 625: remote attacker to crash applications using OpenSSL.</a>
1.294 david 626: <li><a href="errata33.html#isakmpd2"> March 17, 2004:
1.276 brad 627: Defects in the payload validation and processing functions of
628: isakmpd have been discovered. An attacker could send malformed
629: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.294 david 630: <li><a href="errata33.html#httpd2"> March 13, 2004:
1.275 brad 631: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
632: access module, using IP addresses without a netmask on big endian
633: 64-bit platforms causes the rules to fail to match.</a>
1.294 david 634: <li><a href="errata33.html#ip6"> February 8, 2004:
1.275 brad 635: An IPv6 MTU handling problem exists that could be used by an
636: attacker to cause a denial of service attack.</a>
1.294 david 637: <li><a href="errata33.html#sysvshm"> February 5, 2004:
1.271 millert 638: A reference counting bug in shmat(2) could be used to write to
639: kernel memory under certain circumstances.</a>
1.294 david 640: <li><a href="errata33.html#isakmpd">January 15, 2004:
1.268 brad 641: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 642: by Thomas Walpuski.</a>
1.294 david 643: <li><a href="errata33.html#ibcs2">November 17, 2003:
1.264 henning 644: It may be possible for a local user to execute arbitrary code
645: resulting in escalation of privileges due to a stack overrun
646: in compat_ibcs2(8).</a>
1.294 david 647: <li><a href="errata33.html#asn1">October 1, 2003:
1.257 millert 648: The use of certain ASN.1 encodings or malformed public keys may
649: allow an attacker to mount a denial of service attack against
650: applications linked with ssl(3).</a>
1.294 david 651: <li><a href="errata33.html#pfnorm">September 24, 2003:
1.258 beck 652: Access of freed memory in pf(4) could be used to
1.260 margarid 653: remotely panic a machine using scrub rules.</a>
1.294 david 654: <li><a href="errata33.html#sendmail">September 17, 2003:
1.256 millert 655: A buffer overflow in the address parsing in
656: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 657: <li><a href="errata33.html#sshbuffer">September 16, 2003:
1.255 millert 658: OpenSSH versions prior to 3.7 contains a buffer management error
659: that is potentially exploitable.</a>
1.294 david 660: <li><a href="errata33.html#sysvsem">September 10, 2003:
1.254 millert 661: Root may be able to reduce the security level by taking advantage of
662: an integer overflow when the semaphore limits are made very large.</a>
1.294 david 663: <li><a href="errata33.html#semget">August 20, 2003:
1.252 millert 664: An improper bounds check in the kernel may allow a local user
665: to panic the kernel.</a>
1.294 david 666: <li><a href="errata33.html#realpath">August 4, 2003:
1.249 millert 667: An off-by-one error exists in the C library function realpath(3)
668: may allow an attacker to gain escalated privileges.</a>
1.246 deraadt 669: </ul>
670:
1.265 miod 671:
1.247 david 672: <p>
1.246 deraadt 673: <li>
1.288 matthieu 674: <a name="32"></a>
1.224 deraadt 675:
1.294 david 676: <h3><font color="#e00000">OpenBSD 3.2 Security Advisories</font></h3>
1.224 deraadt 677: These are the OpenBSD 3.2 advisories -- all these problems are solved
1.294 david 678: in <a href="anoncvs.html">OpenBSD current</a>. The
679: <a href="stable.html">patch branch</a> for 3.2 is no longer being maintained,
1.265 miod 680: you should update your machine.
1.224 deraadt 681: <p>
682: <ul>
1.294 david 683: <li><a href="errata32.html#asn1">October 1, 2003:
1.257 millert 684: The use of certain ASN.1 encodings or malformed public keys may
685: allow an attacker to mount a denial of service attack against
686: applications linked with ssl(3). This does not affect OpenSSH.</a>
1.294 david 687: <li><a href="errata32.html#pfnorm">September 24, 2003:
1.258 beck 688: Access of freed memory in pf(4) could be used to
1.260 margarid 689: remotely panic a machine using scrub rules.</a>
1.294 david 690: <li><a href="errata32.html#sendmail4">September 17, 2003:
1.256 millert 691: A buffer overflow in the address parsing in
692: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 693: <li><a href="errata32.html#sshbuffer">September 16, 2003:
1.255 millert 694: OpenSSH versions prior to 3.7 contains a buffer management error
695: that is potentially exploitable.</a>
1.294 david 696: <li><a href="errata32.html#sendmail3">August 25, 2003:
1.253 brad 697: Fix for a potential security issue in
698: sendmail(8) with respect to DNS maps.</a>
1.294 david 699: <li><a href="errata32.html#realpath">August 4, 2003:
1.249 millert 700: An off-by-one error exists in the C library function realpath(3)
701: may allow an attacker to gain escalated privileges.</a>
1.294 david 702: <li><a href="errata32.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="errata32.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="errata32.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="errata32.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="errata32.html#lprm">March 5, 2003:
1.238 millert 715: A buffer overflow in lprm(1) may allow an attacker to elevate
716: privileges to user daemon.</a>.
1.294 david 717: <li><a href="errata32.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="errata32.html#httpd">February 25, 2003:
1.236 margarid 721: httpd(8) leaks file inode numbers via ETag header as well as
722: child PIDs in multipart MIME boundary generation. This could
723: lead, for example, to NFS exploitation because it uses inode
724: numbers as part of the file handle.</a>
1.294 david 725: <li><a href="errata32.html#ssl">February 22, 2003:
1.234 margarid 726: In ssl(8) an information leak can occur via timing by performing
727: a MAC computation even if incorrect block cipher padding has
728: been found, this is a countermeasure. Also, check for negative
729: sizes, in allocation routines.</a>
1.294 david 730: <li><a href="errata32.html#cvs">January 20, 2003:
1.232 millert 731: A double free exists in cvs(1) that could lead to privilege
732: escalation for cvs configurations where the cvs command is
1.233 margarid 733: run as a privileged user.</a>
1.294 david 734: <li><a href="errata32.html#named">November 14, 2002:
1.230 millert 735: A buffer overflow exists in named(8) that could lead to a
736: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 737: <li><a href="errata32.html#pool">November 6, 2002:
1.233 margarid 738: A logic error in the pool kernel memory allocator could cause
739: memory corruption in low-memory situations, causing the system
740: to crash.</a>
1.294 david 741: <li><a href="errata32.html#smrsh">November 6, 2002:
1.229 miod 742: An attacker can bypass smrsh(8)'s restrictions and execute
743: arbitrary commands with the privileges of his own account.</a>
1.294 david 744: <li><a href="errata32.html#pfbridge">November 6, 2002:
1.233 margarid 745: Network bridges running pf with scrubbing enabled could cause
746: mbuf corruption, causing the system to crash.</a>
1.294 david 747: <li><a href="errata32.html#kadmin">October 21, 2002:
1.228 miod 748: A buffer overflow can occur in the kadmind(8) daemon, leading
749: to possible remote crash or exploit.</a>
1.224 deraadt 750: </ul>
751:
1.227 miod 752: <p>
753: <li>
1.288 matthieu 754: <a name="31"></a>
1.203 deraadt 755:
1.294 david 756: <h3><font color="#e00000">OpenBSD 3.1 Security Advisories</font></h3>
1.203 deraadt 757: These are the OpenBSD 3.1 advisories -- all these problems are solved
1.294 david 758: in <a href="anoncvs.html">OpenBSD current</a>. The
759: <a href="stable.html">patch branch</a> for 3.1 is no longer being maintained,
1.258 beck 760: you should update your machine.
1.203 deraadt 761:
762: <p>
763: <ul>
1.294 david 764: <li><a href="errata31.html#sendmail2">March 31, 2003:
1.244 miod 765: A buffer overflow in the address parsing in
766: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 767: <li><a href="errata31.html#kerberos">March 24, 2003:
1.242 millert 768: A cryptographic weaknesses in the Kerberos v4 protocol can be
769: exploited on Kerberos v5 as well.</a>
1.294 david 770: <li><a href="errata31.html#kpr">March 19, 2003:
1.241 jufi 771: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 772: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.294 david 773: <li><a href="errata31.html#blinding">March 18, 2003:
1.239 miod 774: Various SSL and TLS operations in OpenSSL are vulnerable to
775: timing attacks.</a>
1.294 david 776: <li><a href="errata31.html#lprm">March 4, 2003:
1.238 millert 777: A buffer overflow in lprm(1) may allow an attacker to gain
778: root privileges.</a>
1.294 david 779: <li><a href="errata31.html#sendmail">March 3, 2003:
1.237 miod 780: A buffer overflow in the envelope comments processing in
781: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 782: <li><a href="errata31.html#ssl2">February 23, 2003:
1.235 miod 783: In ssl(8) an information leak can occur via timing by performing
784: a MAC computation even if incorrect block cipher padding has
785: been found, this is a countermeasure. Also, check for negative
786: sizes, in allocation routines.</a>
1.294 david 787: <li><a href="errata31.html#cvs">January 20, 2003:
1.232 millert 788: A double free exists in cvs(1) that could lead to privilege
789: escalation for cvs configurations where the cvs command is
1.294 david 790: run as a privileged user</a>.
791: <li><a href="errata31.html#named">November 14, 2002:
1.230 millert 792: A buffer overflow exists in named(8) that could lead to a
793: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 794: <li><a href="errata31.html#kernresource">November 6, 2002:
1.229 miod 795: Incorrect argument checking in the getitimer(2) system call
796: may allow an attacker to crash the system.</a>
1.294 david 797: <li><a href="errata31.html#smrsh">November 6, 2002:
1.229 miod 798: An attacker can bypass smrsh(8)'s restrictions and execute
799: arbitrary commands with the privileges of his own account.</a>
1.294 david 800: <li><a href="errata31.html#kadmin">October 21, 2002:
1.226 miod 801: A buffer overflow can occur in the kadmind(8) daemon, leading
802: to possible remote crash or exploit.</a>
1.294 david 803: <li><a href="errata31.html#kerntime">October 2, 2002:
1.222 jason 804: Incorrect argument checking in the setitimer(2) system call
805: may allow an attacker to write to kernel memory.</a>
1.294 david 806: <li><a href="errata31.html#scarg">August 11, 2002:
1.221 provos 807: An insufficient boundary check in the select system call
1.220 miod 808: allows an attacker to overwrite kernel memory and execute arbitrary code
809: in kernel context.</a>
1.294 david 810: <li><a href="errata31.html#ssl">July 30, 2002:
1.218 miod 811: Several remote buffer overflows can occur in the SSL2 server and SSL3
812: client of the ssl(8) library, as in the ASN.1 parser code in the
813: crypto(3) library, all of them being potentially remotely
814: exploitable.</a>
1.294 david 815: <li><a href="errata31.html#xdr">July 29, 2002:
1.218 miod 816: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
817: possible remote crash.</a>
1.294 david 818: <li><a href="errata31.html#pppd">July 29, 2002:
1.218 miod 819: A race condition exists in the pppd(8) daemon which may cause it to
820: alter the file permissions of an arbitrary file.</a>
1.294 david 821: <li><a href="errata31.html#isakmpd">July 5, 2002:
1.218 miod 822: Receiving IKE payloads out of sequence can cause isakmpd(8) to
823: crash.</a>
1.294 david 824: <li><a href="errata31.html#ktrace">June 27, 2002:
1.215 miod 825: The kernel would let any user ktrace set[ug]id processes.</a>
1.294 david 826: <li><a href="errata31.html#modssl">June 26, 2002:
1.213 miod 827: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 828: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.294 david 829: <li><a href="errata31.html#resolver">June 25, 2002:
1.212 millert 830: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 831: <li><a href="errata31.html#sshd">June 24, 2002:
1.216 deraadt 832: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 833: input validation error that can result in an integer overflow and
834: privilege escalation.</a>
1.294 david 835: <li><a href="errata31.html#httpd">June 19, 2002:
1.211 miod 836: A buffer overflow can occur during the interpretation of chunked
837: encoding in httpd(8), leading to possible remote crash.</a>
1.294 david 838: <li><a href="errata31.html#sshbsdauth">May 22, 2002:
1.209 markus 839: Under certain conditions, on systems using YP with netgroups
840: in the password database, it is possible that sshd(8) does
841: ACL checks for the requested user name but uses the password
842: database entry of a different user for authentication. This
843: means that denied users might authenticate successfully
844: while permitted users could be locked out.</a>
1.294 david 845: <li><a href="errata31.html#fdalloc2">May 8, 2002:
1.208 millert 846: A race condition exists that could defeat the kernel's
847: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 848: <li><a href="errata31.html#sudo">April 25, 2002:
1.205 millert 849: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 850: <li><a href="errata31.html#sshafs">April 22, 2002:
1.205 millert 851: A local user can gain super-user privileges due to a buffer
852: overflow in sshd(8) if AFS has been configured on the system
853: or if KerberosTgtPassing or AFSTokenPassing has been enabled
854: in the sshd_config file.</a>
1.203 deraadt 855: </ul>
856:
1.235 miod 857: <p>
1.203 deraadt 858: <li>
1.288 matthieu 859: <a name="30"></a>
1.187 deraadt 860:
1.294 david 861: <h3><font color="#e00000">OpenBSD 3.0 Security Advisories</font></h3>
1.187 deraadt 862: These are the OpenBSD 3.0 advisories -- all these problems are solved
1.294 david 863: in <a href="anoncvs.html">OpenBSD current</a>. The
864: <a href="stable.html">patch branch</a> for 3.0 is no longer being maintained,
1.258 beck 865: you should update your machine.
1.187 deraadt 866:
867: <p>
868: <ul>
1.294 david 869: <li><a href="errata30.html#named">November 14, 2002:
1.230 millert 870: A buffer overflow exists in named(8) that could lead to a
871: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 872: <li><a href="errata30.html#kernresource">November 6, 2002:
1.229 miod 873: Incorrect argument checking in the getitimer(2) system call
874: may allow an attacker to crash the system.</a>
1.294 david 875: <li><a href="errata30.html#smrsh">November 6, 2002:
1.229 miod 876: An attacker can bypass smrsh(8)'s restrictions and execute
877: arbitrary commands with the privileges of his own account.</a>
1.294 david 878: <li><a href="errata30.html#kadmin">October 21, 2002:
1.226 miod 879: A buffer overflow can occur in the kadmind(8) daemon, leading
880: to possible remote crash or exploit.</a>
1.294 david 881: <li><a href="errata30.html#kerntime">October 7, 2002:
1.223 miod 882: Incorrect argument checking in the setitimer(2) system call
883: may allow an attacker to write to kernel memory.</a>
1.294 david 884: <li><a href="errata30.html#scarg">August 11, 2002:
1.220 miod 885: An insufficient boundary check in the select and poll system calls
886: allows an attacker to overwrite kernel memory and execute arbitrary code
887: in kernel context.</a>
1.294 david 888: <li><a href="errata30.html#ssl">July 30, 2002:
1.218 miod 889: Several remote buffer overflows can occur in the SSL2 server and SSL3
890: client of the ssl(8) library, as in the ASN.1 parser code in the
891: crypto(3) library, all of them being potentially remotely
892: exploitable.</a>
1.294 david 893: <li><a href="errata30.html#xdr">July 29, 2002:
1.218 miod 894: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
895: possible remote crash.</a>
1.294 david 896: <li><a href="errata30.html#pppd">July 29, 2002:
1.218 miod 897: A race condition exists in the pppd(8) daemon which may cause it to
898: alter the file permissions of an arbitrary file.</a>
1.294 david 899: <li><a href="errata30.html#isakmpd2">July 5, 2002:
1.218 miod 900: Receiving IKE payloads out of sequence can cause isakmpd(8) to
901: crash.</a>
1.294 david 902: <li><a href="errata30.html#ktrace">June 27, 2002:
1.215 miod 903: The kernel would let any user ktrace set[ug]id processes.</a>
1.294 david 904: <li><a href="errata30.html#resolver">June 25, 2002:
1.212 millert 905: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 906: <li><a href="errata30.html#sshdauth">June 24, 2002:
1.216 deraadt 907: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 908: input validation error that can result in an integer overflow and
909: privilege escalation.</a>
1.294 david 910: <li><a href="errata30.html#modssl">June 24, 2002:
1.213 miod 911: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 912: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.294 david 913: <li><a href="errata30.html#httpd">June 19, 2002:
1.213 miod 914: A buffer overflow can occur during the interpretation of chunked
915: encoding in httpd(8), leading to possible remote crash.</a>
1.294 david 916: <li><a href="errata30.html#fdalloc2">May 8, 2002:
1.208 millert 917: A race condition exists that could defeat the kernel's
918: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 919: <li><a href="errata30.html#sudo2">April 25, 2002:
1.205 millert 920: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 921: <li><a href="errata30.html#sshafs">April 22, 2002:
1.205 millert 922: A local user can gain super-user privileges due to a buffer
923: overflow in sshd(8) if AFS has been configured on the system
924: or if KerberosTgtPassing or AFSTokenPassing has been enabled
925: in the sshd_config file.</a>
1.294 david 926: <li><a href="errata30.html#mail">April 11, 2002:
1.202 millert 927: The mail(1) was interpreting tilde escapes even when invoked
928: in non-interactive mode. As mail(1) is called as root from cron,
929: this can lead to a local root compromise.</a>
1.294 david 930: <li><a href="errata30.html#approval">March 19, 2002:
1.201 millert 931: Under certain conditions, on systems using YP with netgroups in
932: the password database, it is possible for the rexecd(8) and rshd(8)
933: daemons to execute a shell from a password database entry for a
934: different user. Similarly, atrun(8) may change to the wrong
935: home directory when running jobs.</a>
1.294 david 936: <li><a href="errata30.html#zlib">March 13, 2002:
1.200 millert 937: A potential double free() exists in the zlib library;
938: this is not exploitable on OpenBSD.
939: The kernel also contains a copy of zlib; it is not
940: currently known if the kernel zlib is exploitable.</a>
1.294 david 941: <li><a href="errata30.html#openssh">March 8, 2002:
1.198 millert 942: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 943: may allow a local user to gain super-user privileges.</a>
1.294 david 944: <li><a href="errata30.html#ptrace">January 21, 2002:
1.192 jason 945: A race condition between the ptrace(2) and execve(2) system calls
946: allows an attacker to modify the memory contents of suid/sgid
947: processes which could lead to compromise of the super-user account.</a>
1.294 david 948: <li><a href="errata30.html#sudo">January 17, 2002:
1.191 millert 949: There is a security hole in sudo(8) that can be exploited
950: when the Postfix sendmail replacement is installed that may
951: allow an attacker on the local host to gain root privileges.</a>
1.294 david 952: <li><a href="errata30.html#lpd">November 28, 2001:
1.189 millert 953: An attacker can trick a machine running the lpd daemon into
954: creating new files in the root directory from a machine with
955: remote line printer access.</a>
1.294 david 956: <li><a href="errata30.html#vi.recover">November 13, 2001:
1.188 millert 957: The vi.recover script can be abused in such a way as
958: to cause arbitrary zero-length files to be removed.</a>
1.294 david 959: <li><a href="errata30.html#pf">November 13, 2001:
1.190 mpech 960: pf(4) was incapable of dealing with certain ipv6 icmp packets,
961: resulting in a crash.</a>
1.294 david 962: <li><a href="errata30.html#sshd">November 12, 2001:
1.190 mpech 963: A security hole that may allow an attacker to partially authenticate
964: if -- and only if -- the administrator has enabled KerberosV.</a>
1.187 deraadt 965: </ul>
966:
967: <p>
968: <li>
1.288 matthieu 969: <a name="29"></a>
1.173 deraadt 970:
1.294 david 971: <h3><font color="#e00000">OpenBSD 2.9 Security Advisories</font></h3>
1.173 deraadt 972: These are the OpenBSD 2.9 advisories -- all these problems are solved
1.294 david 973: in <a href="anoncvs.html">OpenBSD current</a>. The
974: <a href="stable.html">patch branch</a>. for 2.9 is no longer being maintained,
1.258 beck 975: you should update your machine.
976:
1.173 deraadt 977:
978: <p>
979: <ul>
1.294 david 980: <li><a href="errata29.html#resolver">June 25, 2002:
1.212 millert 981: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 982: <li><a href="errata29.html#fdalloc2">May 8, 2002:
1.208 millert 983: A race condition exists that could defeat the kernel's
984: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 985: <li><a href="errata29.html#sudo2">April 25, 2002:
1.207 millert 986: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 987: <li><a href="errata29.html#sshafs">April 22, 2002:
1.206 millert 988: A local user can gain super-user privileges due to a buffer
989: overflow in sshd(8) if AFS has been configured on the system
990: or if KerberosTgtPassing or AFSTokenPassing has been enabled
991: in the sshd_config file.</a>
1.294 david 992: <li><a href="errata29.html#mail">April 11, 2002:
1.202 millert 993: The mail(1) was interpreting tilde escapes even when invoked
994: in non-interactive mode. As mail(1) is called as root from cron,
995: this can lead to a local root compromise.</a>
1.294 david 996: <li><a href="errata29.html#zlib">March 13, 2002:
1.200 millert 997: A potential double free() exists in the zlib library;
998: this is not exploitable on OpenBSD.
999: The kernel also contains a copy of zlib; it is not
1000: currently known if the kernel zlib is exploitable.</a>
1.294 david 1001: <li><a href="errata29.html#openssh">March 8, 2002:
1.198 millert 1002: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 1003: may allow a local user to gain super-user privileges.</a>
1.294 david 1004: <li><a href="errata29.html#ptrace">January 21, 2002:
1.198 millert 1005: A race condition between the ptrace(2) and execve(2) system calls
1006: allows an attacker to modify the memory contents of suid/sgid
1007: processes which could lead to compromise of the super-user account.</a>
1.294 david 1008: <li><a href="errata29.html#sudo">January 17, 2002:
1.191 millert 1009: There is a security hole in sudo(8) that can be exploited
1010: when the Postfix sendmail replacement is installed that may
1011: allow an attacker on the local host to gain root privileges.</a>
1.294 david 1012: <li><a href="errata29.html#lpd2">November 28, 2001:
1.189 millert 1013: An attacker can trick a machine running the lpd daemon into
1014: creating new files in the root directory from a machine with
1015: remote line printer access.</a>
1.294 david 1016: <li><a href="errata29.html#vi.recover">November 13, 2001:
1.190 mpech 1017: The vi.recover script can be abused in such a way as
1018: to cause arbitrary zero-length files to be removed.</a>
1.294 david 1019: <li><a href="errata29.html#uucp">September 11, 2001:
1.184 millert 1020: A security hole exists in uuxqt(8) that may allow an
1021: attacker to gain root privileges.</a>
1.294 david 1022: <li><a href="errata29.html#lpd">August 29, 2001:
1.183 millert 1023: A security hole exists in lpd(8) that may allow an
1024: attacker to gain root privileges if lpd is running.</a>
1.294 david 1025: <li><a href="errata29.html#sendmail2">August 21, 2001:
1.181 millert 1026: A security hole exists in sendmail(8) that may allow an
1027: attacker on the local host to gain root privileges.</a>
1.294 david 1028: <li><a href="errata29.html#nfs">July 30, 2001:
1.180 jason 1029: A kernel buffer overflow in the NFS code can be used to execute
1030: arbitrary code by users with mount privileges (only root by
1.181 millert 1031: default).</a>
1.294 david 1032: <li><a href="errata29.html#kernexec">June 15, 2001:
1.178 aaron 1033: A race condition in the kernel can lead to local root compromise.</a>
1.294 david 1034: <li><a href="errata29.html#sshcookie">June 12, 2001:
1.177 markus 1035: sshd(8) allows users to delete arbitrary files named "cookies"
1036: if X11 forwarding is enabled. X11 forwarding is disabled
1037: by default.</a>
1.294 david 1038: <li><a href="errata29.html#fts">May 30, 2001:
1.176 millert 1039: Programs using the fts routines can be tricked into changing
1040: into the wrong directory.</a>
1.294 david 1041: <li><a href="errata29.html#sendmail">May 29, 2001:
1.174 millert 1042: Sendmail signal handlers contain unsafe code,
1043: leading to numerous race conditions.</a>
1.173 deraadt 1044: </ul>
1045:
1046: <p>
1047: <li>
1.288 matthieu 1048: <a name="28"></a>
1.152 deraadt 1049:
1.294 david 1050: <h3><font color="#e00000">OpenBSD 2.8 Security Advisories</font></h3>
1.152 deraadt 1051: These are the OpenBSD 2.8 advisories -- all these problems are solved
1.294 david 1052: in <a href="anoncvs.html">OpenBSD current</a>. The
1053: <a href="stable.html">patch branch</a>. for 2.8 is no longer being maintained,
1.258 beck 1054: you should update your machine.
1055:
1.152 deraadt 1056:
1057: <p>
1058: <ul>
1.294 david 1059: <li><a href="errata28.html#uucp">September 11, 2001:
1.184 millert 1060: A security hole exists in uuxqt(8) that may allow an
1061: attacker to gain root privileges.</a>
1.294 david 1062: <li><a href="errata28.html#lpd">August 29, 2001:
1.183 millert 1063: A security hole exists in lpd(8) that may allow an
1064: attacker to gain root privileges if lpd is running.</a>
1.294 david 1065: <li><a href="errata28.html#sendmail2">August 21, 2001:
1.181 millert 1066: A security hole exists in sendmail(8) that may allow an
1067: attacker on the local host to gain root privileges.</a>
1.294 david 1068: <li><a href="errata28.html#kernexec">June 15, 2001:
1.178 aaron 1069: A race condition in the kernel can lead to local root compromise.</a>
1.294 david 1070: <li><a href="errata28.html#fts">May 30, 2001:
1.176 millert 1071: Programs using the fts routines can be tricked into changing
1072: into the wrong directory.</a>
1.294 david 1073: <li><a href="errata28.html#sendmail">May 29, 2001:
1.175 millert 1074: Sendmail signal handlers contain unsafe code,
1075: leading to numerous race conditions.</a>
1.294 david 1076: <li><a href="errata28.html#ipf_frag">Apr 23, 2001:
1.231 mickey 1077: IPF contains a serious bug with its handling of fragment caching.</a>
1.294 david 1078: <li><a href="errata28.html#glob_limit">Apr 23, 2001:
1.172 ericj 1079: ftpd(8) contains a potential DoS relating to glob(3).</a>
1.294 david 1080: <li><a href="errata28.html#glob">Apr 10, 2001:
1.170 ericj 1081: The glob(3) library call contains multiple buffer overflows.</a>
1.294 david 1082: <li><a href="errata28.html#readline">Mar 18, 2001:
1.169 millert 1083: The readline library creates history files with permissive modes based on the user's umask.</a>
1.294 david 1084: <li><a href="errata28.html#ipsec_ah">Mar 2, 2001:
1.167 ericj 1085: Insufficient checks in the IPSEC AH IPv4 option handling code can lead to a buffer overrun in the kernel.</a>
1.294 david 1086: <li><a href="errata28.html#userldt">Mar 2, 2001:
1.168 horacio 1087: The <b>USER_LDT</b> kernel option allows an attacker to gain access to privileged areas of kernel memory.</a>
1.294 david 1088: <li><a href="errata28.html#sudo">Feb 22, 2001:
1.171 millert 1089: a non-exploitable buffer overflow was fixed in sudo(8).</a>
1.294 david 1090: <li><a href="errata28.html#named">Jan 29, 2001:
1.163 jason 1091: merge named(8) with ISC BIND 4.9.8-REL, which fixes some buffer vulnerabilities.</a>
1.294 david 1092: <li><a href="errata28.html#rnd">Jan 22, 2001:
1.162 jason 1093: rnd(4) did not use all of its input when written to.</a>
1.294 david 1094: <li><a href="errata28.html#xlock">Dec 22, 2000:
1.159 ericj 1095: xlock(1)'s authentication was re-done to authenticate via a named pipe. (patch and new xlock binaries included).</a>
1.294 david 1096: <li><a href="errata28.html#procfs">Dec 18, 2000:
1.157 ericj 1097: Procfs contains numerous overflows. Procfs is not used by default in OpenBSD. (patch included).</a>
1.294 david 1098: <li><a href="errata28.html#kerberos2">Dec 10, 2000:
1.156 deraadt 1099: Another problem exists in KerberosIV libraries (patch included).</a>
1.294 david 1100: <li><a href="errata28.html#kerberos">Dec 7, 2000:
1.155 deraadt 1101: A set of problems in KerberosIV exist (patch included).</a>
1.294 david 1102: <li><a href="errata28.html#ftpd">Dec 4, 2000:
1.154 millert 1103: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.152 deraadt 1104: </ul>
1105:
1106: <p>
1107: <li>
1.288 matthieu 1108: <a name="27"></a>
1.124 deraadt 1109:
1.294 david 1110: <h3><font color="#e00000">OpenBSD 2.7 Security Advisories</font></h3>
1.124 deraadt 1111: These are the OpenBSD 2.7 advisories -- all these problems are solved
1.294 david 1112: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.124 deraadt 1113: OpenBSD 2.6 advisories listed below are fixed in OpenBSD 2.7.
1114:
1115: <p>
1116: <ul>
1.294 david 1117: <li><a href="errata27.html#readline">Mar 18, 2001:
1.169 millert 1118: The readline library creates history files with permissive modes based on the user's umask.</a>
1.294 david 1119: <li><a href="errata27.html#sudo">Feb 22, 2001:
1.169 millert 1120: a buffer overflow was fixed in sudo(8).</a>
1.294 david 1121: <li><a href="errata27.html#ftpd">Dec 4, 2000:
1.154 millert 1122: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.294 david 1123: <li><a href="errata27.html#sshforwarding">Nov 10, 2000:
1.152 deraadt 1124: Hostile servers can force OpenSSH clients to do agent or X11 forwarding.
1125: (patch included)</a>
1.294 david 1126: <li><a href="errata27.html#xtrans">Oct 26, 2000:
1.151 matthieu 1127: X11 libraries have 2 potential overflows in xtrans code.
1128: (patch included)</a>
1.294 david 1129: <li><a href="errata27.html#httpd">Oct 18, 2000:
1.150 beck 1130: Apache mod_rewrite and mod_vhost_alias modules could expose files
1131: on the server in certain configurations if used.
1132: (patch included)</a>
1.294 david 1133: <li><a href="errata27.html#telnetd">Oct 10, 2000:
1.149 millert 1134: The telnet daemon does not strip out the TERMINFO, TERMINFO_DIRS,
1135: TERMPATH and TERMCAP environment variables as it should.
1136: (patch included)</a>
1.294 david 1137: <li><a href="errata27.html#format_strings">Oct 6, 2000:
1.148 millert 1138: There are printf-style format string bugs in several privileged
1139: programs. (patch included)</a>
1.294 david 1140: <li><a href="errata27.html#curses">Oct 6, 2000:
1.147 millert 1141: libcurses honored terminal descriptions in the $HOME/.terminfo
1142: directory as well as in the TERMCAP environment variable for
1143: setuid and setgid applications.
1.146 deraadt 1144: (patch included)</a>
1.294 david 1145: <li><a href="errata27.html#talkd">Oct 6, 2000:
1.146 deraadt 1146: A format string vulnerability exists in talkd(8).
1147: (patch included)</a>
1.294 david 1148: <li><a href="errata27.html#pw_error">Oct 3, 2000:
1.145 aaron 1149: A format string vulnerability exists in the pw_error() function of the
1150: libutil library, yielding localhost root through chpass(1).
1151: (patch included)</a>
1.294 david 1152: <li><a href="errata27.html#ipsec">Sep 18, 2000:
1.144 jason 1153: Bad ESP/AH packets could cause a crash under certain conditions.
1154: (patch included)</a>
1.294 david 1155: <li><a href="errata27.html#xlock">Aug 16, 2000:
1.141 deraadt 1156: A format string vulnerability (localhost root) exists in xlock(1).
1157: (patch included)</a>
1.294 david 1158: <li><a href="errata27.html#X11_libs">July 14, 2000:
1.139 deraadt 1159: Various bugs found in X11 libraries have various side effects, almost
1160: completely denial of service in OpenBSD.
1161: (patch included)</a>
1.294 david 1162: <li><a href="errata27.html#ftpd">July 5, 2000:
1.136 deraadt 1163: Just like pretty much all the other unix ftp daemons
1164: on the planet, ftpd had a remote root hole in it.
1165: Luckily, ftpd was not enabled by default.
1.137 deraadt 1166: The problem exists if anonymous ftp is enabled.
1.136 deraadt 1167: (patch included)</a>
1.294 david 1168: <li><a href="errata27.html#mopd">July 5, 2000:
1.136 deraadt 1169: Mopd, very rarely used, contained some buffer overflows.
1170: (patch included)</a>
1.294 david 1171: <li><a href="errata27.html#libedit">June 28, 2000:
1.135 deraadt 1172: libedit would check for a <b>.editrc</b> file in the current
1173: directory. Not known to be a real security issue, but a patch
1174: is available anyways.
1175: (patch included)</a>
1.294 david 1176: <li><a href="errata27.html#dhclient">June 24, 2000:
1.134 deraadt 1177: A serious bug in dhclient(8) could allow strings from a
1178: malicious dhcp server to be executed in the shell as root.
1179: (patch included)</a>
1.294 david 1180: <li><a href="errata27.html#isakmpd">June 9, 2000:
1.133 deraadt 1181: A serious bug in isakmpd(8) policy handling wherein
1182: policy verification could be completely bypassed in isakmpd.
1183: (patch included)</a>
1.294 david 1184: <li><a href="errata27.html#uselogin">June 6, 2000:
1.132 deraadt 1185: The non-default flag UseLogin in <b>/etc/sshd_config</b> is broken,
1186: should not be used, and results in security problems on
1187: other operating systems.</a>
1.294 david 1188: <li><a href="errata27.html#bridge">May 26, 2000:
1.129 deraadt 1189: The bridge(4) <i>learning</i> flag may be bypassed.
1.128 deraadt 1190: (patch included)</a>
1.294 david 1191: <li><a href="errata27.html#ipf">May 25, 2000:
1.127 kjell 1192: Improper use of ipf <i>keep-state</i> rules can result
1193: in firewall rules being bypassed. (patch included)</a>
1194:
1.124 deraadt 1195: </ul>
1196:
1197: <p>
1198: <li>
1.288 matthieu 1199: <a name="26"></a>
1.119 deraadt 1200:
1.294 david 1201: <h3><font color="#e00000">OpenBSD 2.6 Security Advisories</font></h3>
1.119 deraadt 1202: These are the OpenBSD 2.6 advisories -- all these problems are solved
1.294 david 1203: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.119 deraadt 1204: OpenBSD 2.5 advisories listed below are fixed in OpenBSD 2.6.
1205:
1206: <p>
1207: <ul>
1.294 david 1208: <li><a href="errata26.html#semconfig">May 26, 2000:
1.130 deraadt 1209: SYSV semaphore support contained an undocumented system call
1.131 deraadt 1210: which could wedge semaphore-using processes from exiting. (patch included)</a>
1.294 david 1211: <li><a href="errata26.html#ipf">May 25, 2000:
1.127 kjell 1212: Improper use of ipf <i>keep-state</i> rules can result
1213: in firewall rules being bypassed. (patch included)</a>
1.294 david 1214: <li><a href="errata26.html#xlockmore">May 25, 2000:
1.125 deraadt 1215: xlockmore has a bug which a localhost attacker can use to gain
1216: access to the encrypted root password hash (which is normally
1.245 miod 1217: encoded using blowfish</a> (see
1.294 david 1218: <a href="http://www.openbsd.org/cgi-bin/man.cgi?query=crypt&sektion=3">
1.125 deraadt 1219: crypt(3)</a>)
1.245 miod 1220: (patch included).
1.294 david 1221: <li><a href="errata26.html#procfs">Jan 20, 2000:
1.123 deraadt 1222: Systems running with procfs enabled and mounted are
1223: vulnerable to a very tricky exploit. procfs is not
1224: mounted by default.
1225: (patch included).</a>
1.294 david 1226: <li><a href="errata26.html#sendmail">Dec 4, 1999:
1.296 david 1227: Sendmail permitted any user to cause an aliases file wrap,
1.190 mpech 1228: thus exposing the system to a race where the aliases file
1229: did not exist.
1.119 deraadt 1230: (patch included).</a>
1.294 david 1231: <li><a href="errata26.html#poll">Dec 4, 1999:
1.190 mpech 1232: Various bugs in poll(2) may cause a kernel crash.</a>
1.294 david 1233: <li><a href="errata26.html#sslUSA">Dec 2, 1999:
1.120 deraadt 1234: A buffer overflow in the RSAREF code included in the
1235: USA version of libssl, is possibly exploitable in
1236: httpd, ssh, or isakmpd, if SSL/RSA features are enabled.
1.124 deraadt 1237: (patch included).<br></a>
1238: <strong>Update:</strong> Turns out that this was not exploitable
1239: in any of the software included in OpenBSD 2.6.
1.294 david 1240: <li><a href="errata26.html#ifmedia">Nov 9, 1999:
1.190 mpech 1241: Any user could change interface media configurations, resulting in
1242: a localhost denial of service attack.
1.121 deraadt 1243: (patch included).</a>
1.119 deraadt 1244: </ul>
1245:
1246: <p>
1247: <li>
1.288 matthieu 1248: <a name="25"></a>
1.106 deraadt 1249:
1.294 david 1250: <h3><font color="#e00000">OpenBSD 2.5 Security Advisories</font></h3>
1.93 deraadt 1251: These are the OpenBSD 2.5 advisories -- all these problems are solved
1.294 david 1252: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.93 deraadt 1253: OpenBSD 2.4 advisories listed below are fixed in OpenBSD 2.5.
1254:
1.96 deraadt 1255: <p>
1.104 deraadt 1256: <ul>
1.294 david 1257: <li><a href="errata25.html#cron">Aug 30, 1999:
1.103 deraadt 1258: In cron(8), make sure argv[] is NULL terminated in the
1259: fake popen() and run sendmail as the user, not as root.
1260: (patch included).</a>
1.294 david 1261: <li><a href="errata25.html#miscfs">Aug 12, 1999: The procfs and fdescfs
1.101 deraadt 1262: filesystems had an overrun in their handling of uio_offset
1263: in their readdir() routines. (These filesystems are not
1264: enabled by default). (patch included).</a>
1.294 david 1265: <li><a href="errata25.html#profil">Aug 9, 1999: Stop profiling (see profil(2))
1.100 deraadt 1266: when we execve() a new process. (patch included).</a>
1.294 david 1267: <li><a href="errata25.html#ipsec_in_use">Aug 6, 1999: Packets that should have
1.98 deraadt 1268: been handled by IPsec may be transmitted as cleartext.
1269: PF_KEY SA expirations may leak kernel resources.
1270: (patch included).</a>
1.294 david 1271: <li><a href="errata25.html#rc">Aug 5, 1999: In /etc/rc, use mktemp(1) for
1.97 deraadt 1272: motd re-writing and change the find(1) to use -execdir
1273: (patch included).</a>
1.294 david 1274: <li><a href="errata25.html#chflags">Jul 30, 1999: Do not permit regular
1.95 deraadt 1275: users to chflags(2) or fchflags(2) on character or block devices
1276: which they may currently be the owner of (patch included).</a>
1.294 david 1277: <li><a href="errata25.html#nroff">Jul 27, 1999: Cause groff(1) to be invoked
1.95 deraadt 1278: with the -S flag, when called by nroff(1) (patch included).</a>
1.93 deraadt 1279: </ul>
1280:
1.106 deraadt 1281: <p>
1282: <li>
1.288 matthieu 1283: <a name="24"></a>
1.235 miod 1284:
1.294 david 1285: <h3><font color="#e00000">OpenBSD 2.4 Security Advisories</font></h3>
1.75 deraadt 1286: These are the OpenBSD 2.4 advisories -- all these problems are solved
1.294 david 1287: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.75 deraadt 1288: OpenBSD 2.3 advisories listed below are fixed in OpenBSD 2.4.
1289:
1.96 deraadt 1290: <p>
1.75 deraadt 1291: <ul>
1.294 david 1292: <li><a href="errata24.html#poll">Mar 22, 1999: The nfds argument for poll(2) needs
1.91 deraadt 1293: to be constrained, to avoid kvm starvation (patch included).</a>
1.294 david 1294: <li><a href="errata24.html#tss">Mar 21, 1999: A change in TSS handling stops
1.91 deraadt 1295: another kernel crash case caused by the <strong>crashme</strong>
1296: program (patch included).</a>
1.294 david 1297: <li><a href="errata24.html#nlink">Feb 25, 1999: An unbounded increment on the
1.90 deraadt 1298: nlink value in FFS and EXT2FS filesystems can cause a system crash.
1.89 deraadt 1299: (patch included).</a>
1.294 david 1300: <li><a href="errata24.html#ping">Feb 23, 1999: Yet another buffer overflow
1.88 deraadt 1301: existed in ping(8). (patch included).</a>
1.294 david 1302: <li><a href="errata24.html#ipqrace">Feb 19, 1999: ipintr() had a race in use of
1.87 deraadt 1303: the ipq, which could permit an attacker to cause a crash.
1304: (patch included).</a>
1.294 david 1305: <li><a href="errata24.html#accept">Feb 17, 1999: A race condition in the
1.86 deraadt 1306: kernel between accept(2) and select(2) could permit an attacker
1307: to hang sockets from remote.
1308: (patch included).</a>
1.294 david 1309: <li><a href="errata24.html#maxqueue">Feb 17, 1999: IP fragment assembly can
1.85 deraadt 1310: bog the machine excessively and cause problems.
1311: (patch included).</a>
1.294 david 1312: <li><a href="errata24.html#trctrap">Feb 12, 1999: i386 T_TRCTRAP handling and
1.84 deraadt 1313: DDB interacted to possibly cause a crash.
1314: (patch included).</a>
1.294 david 1315: <li><a href="errata24.html#rst">Feb 11, 1999: TCP/IP RST handling was sloppy.
1.83 deraadt 1316: (patch included).</a>
1.294 david 1317: <li><a href="errata24.html#bootpd">Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 1318: problem in bootpd(8). (patch included).</a>
1.294 david 1319: <li><a href="errata24.html#termcap">Nov 19, 1998: There is a possibly locally
1.82 deraadt 1320: exploitable problem relating to environment variables in termcap
1321: and curses. (patch included).</a>
1.294 david 1322: <li><a href="errata24.html#tcpfix">Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 1323: bug in the TCP decoding kernel. (patch included).</a>
1.75 deraadt 1324: </ul>
1325:
1.106 deraadt 1326: <p>
1327: <li>
1.288 matthieu 1328: <a name="23"></a>
1.235 miod 1329:
1.294 david 1330: <h3><font color="#e00000">OpenBSD 2.3 Security Advisories</font></h3>
1.73 deraadt 1331: These are the OpenBSD 2.3 advisories -- all these problems are solved
1.294 david 1332: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.73 deraadt 1333: OpenBSD 2.2 advisories listed below are fixed in OpenBSD 2.3.
1.53 matthieu 1334:
1.96 deraadt 1335: <p>
1.53 matthieu 1336: <ul>
1.294 david 1337: <li><a href="errata23.html#bootpd">Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 1338: problem in bootpd(8). (patch included).</a>
1.294 david 1339: <li><a href="errata23.html#tcpfix">Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 1340: bug in the TCP decoding kernel. (patch included).</a>
1.294 david 1341: <li><a href="errata23.html#resolver">August 31, 1998: A benign looking resolver
1.190 mpech 1342: buffer overflow bug was re-introduced accidentally (patches included).</a>
1.294 david 1343: <li><a href="errata23.html#chpass">Aug 2, 1998:
1.190 mpech 1344: chpass(1) has a file descriptor leak which allows an
1345: attacker to modify /etc/master.passwd.</a>
1.294 david 1346: <li><a href="errata23.html#inetd">July 15, 1998: Inetd had a file descriptor leak.</a>
1347: <li><a href="errata23.html#fdalloc">Jul 2, 1998: setuid and setgid processes
1.72 deraadt 1348: should not be executed with fd slots 0, 1, or 2 free.
1349: (patch included).</a>
1.294 david 1350: <li><a href="errata23.html#xlib">June 6, 1998: Further problems with the X
1.71 deraadt 1351: libraries (patches included).</a>
1.294 david 1352: <li><a href="errata23.html#kill">May 17, 1998: kill(2) of setuid/setgid target
1.66 deraadt 1353: processes too permissive (4th revision patch included).</a>
1.294 david 1354: <li><a href="errata23.html#immutable">May 11, 1998: mmap() permits partial bypassing
1.60 deraadt 1355: of immutable and append-only file flags. (patch included).</a>
1.294 david 1356: <li><a href="errata23.html#ipsec">May 5, 1998: Incorrect handling of IPSEC packets
1.190 mpech 1357: if IPSEC is enabled (patch included).</a>
1.294 david 1358: <li><a href="errata23.html#xterm-xaw">May 1, 1998: Buffer overflow in xterm and Xaw
1.58 deraadt 1359: (CERT advisory VB-98.04) (patch included).</a>
1.53 matthieu 1360: </ul>
1.9 deraadt 1361:
1.106 deraadt 1362: <p>
1363: <li>
1.288 matthieu 1364: <a name="22"></a>
1.235 miod 1365:
1.294 david 1366: <h3><font color="#e00000">OpenBSD 2.2 Security Advisories</font></h3>
1.45 deraadt 1367: These are the OpenBSD 2.2 advisories. All these problems are solved
1.294 david 1368: in <a href="23.html">OpenBSD 2.3</a>. Some of these problems
1.45 deraadt 1369: still exist in other operating systems. (The supplied patches are for
1370: OpenBSD 2.2; they may or may not work on OpenBSD 2.1).
1.9 deraadt 1371:
1.96 deraadt 1372: <p>
1.9 deraadt 1373: <ul>
1.294 david 1374: <li><a href="errata22.html#ipsec">May 5, 1998: Incorrect handling of IPSEC
1.72 deraadt 1375: packets if IPSEC is enabled (patch included).</a>
1.294 david 1376: <li><a href="errata22.html#xterm-xaw">May 1, 1998: Buffer overflow in xterm
1.72 deraadt 1377: and Xaw (CERT advisory VB-98.04) (patch included).</a>
1.294 david 1378: <li><a href="errata22.html#uucpd">Apr 22, 1998: Buffer overflow in uucpd
1.72 deraadt 1379: (patch included).</a>
1.294 david 1380: <li><a href="errata22.html#rmjob">Apr 22, 1998: Buffer mismanagement in lprm
1.72 deraadt 1381: (patch included).</a>
1.294 david 1382: <li><a href="errata22.html#ping">Mar 31, 1998: Overflow in ping -R (patch included).</a>
1383: <li><a href="errata22.html#named">Mar 30, 1998: Overflow in named fake-iquery
1.59 deraadt 1384: (patch included).</a>
1.294 david 1385: <li><a href="errata22.html#mountd">Mar 2, 1998: Accidental NFS filesystem
1.72 deraadt 1386: export (patch included).</a>
1.112 philen 1387: <li><a href="advisories/mmap.txt">Feb 26, 1998: Read-write mmap() flaw.</a>
1.294 david 1388: Revision 3 of the patch is available <a href="errata22.html#mmap">here</a>
1.112 philen 1389: <li><a href="advisories/sourceroute.txt">Feb 19, 1998: Sourcerouted Packet
1.59 deraadt 1390: Acceptance.</a>
1.294 david 1391: A patch is available <a href="errata22.html#sourceroute">here</a>.
1392: <li><a href="errata22.html#ruserok">Feb 13, 1998: Setuid coredump & Ruserok()
1.72 deraadt 1393: flaw (patch included).</a>
1.294 david 1394: <li><a href="errata22.html#ldso">Feb 9, 1998: MIPS ld.so flaw (patch included).</a>
1.1 deraadt 1395: </ul>
1396:
1.106 deraadt 1397: <p>
1398: <li>
1.288 matthieu 1399: <a name="21"></a>
1.235 miod 1400:
1.294 david 1401: <h3><font color="#e00000">OpenBSD 2.1 Security Advisories</font></h3>
1.52 deraadt 1402: These are the OpenBSD 2.1 advisories. All these problems are solved
1.294 david 1403: in <a href="22.html">OpenBSD 2.2</a>. Some of these problems still
1.52 deraadt 1404: exist in other operating systems. (If you are running OpenBSD 2.1, we
1405: would strongly recommend an upgrade to the newest release, as this
1406: patch list only attempts at fixing the most important security
1407: problems. In particular, OpenBSD 2.2 fixes numerous localhost
1408: security problems. Many of those problems were solved in ways which
1409: make it hard for us to provide patches).
1410:
1.96 deraadt 1411: <p>
1.52 deraadt 1412: <ul>
1.112 philen 1413: <li><a href="advisories/signals.txt">Sep 15, 1997: Deviant Signals (patch included)</a>
1414: <li><a href="advisories/rfork.txt">Aug 2, 1997: Rfork() system call flaw
1.59 deraadt 1415: (patch included)</a>
1.112 philen 1416: <li><a href="advisories/procfs.txt">Jun 24, 1997: Procfs flaws (patch included)</a>
1.52 deraadt 1417: </ul>
1.51 deraadt 1418:
1.106 deraadt 1419: <p>
1420: <li>
1.288 matthieu 1421: <a name="20"></a>
1.235 miod 1422:
1.294 david 1423: <h3><font color="#e00000">OpenBSD 2.0 Security Advisories</font></h3>
1.99 deraadt 1424: These are the OpenBSD 2.0 advisories. All these problems are solved
1.294 david 1425: in <a href="21.html">OpenBSD 2.1</a>. Some of these problems still
1.99 deraadt 1426: exist in other operating systems. (If you are running OpenBSD 2.0, we
1427: commend you for being there back in the old days!, but you're really
1428: missing out if you don't install a new version!)
1429:
1430: <p>
1431: <ul>
1.112 philen 1432: <li><a href="advisories/res_random.txt">April 22, 1997: Predictable IDs in the
1.99 deraadt 1433: resolver (patch included)</a>
1434: <li>Many others... if people can hunt them down, please let me know
1435: and we'll put them up here.
1436: </ul>
1.51 deraadt 1437: <p>
1.106 deraadt 1438:
1.288 matthieu 1439: <a name="watching"></a>
1.294 david 1440: <li><h3><font color="#e00000">Watching our Changes</font></h3><p>
1.106 deraadt 1441:
1.21 deraadt 1442: Since we take a proactive stance with security, we are continually
1443: finding and fixing new security problems. Not all of these problems
1.80 espie 1444: get widely reported because (as stated earlier) many of them are not
1.45 deraadt 1445: confirmed to be exploitable; many simple bugs we fix do turn out to
1446: have security consequences we could not predict. We do not have the
1447: time resources to make these changes available in the above format.<p>
1.21 deraadt 1448:
1449: Thus there are usually minor security fixes in the current source code
1450: beyond the previous major OpenBSD release. We make a limited
1.45 deraadt 1451: guarantee that these problems are of minimal impact and unproven
1.44 ian 1452: exploitability. If we discover that a problem definitely matters for
1.45 deraadt 1453: security, patches will show up here <strong>VERY</strong> quickly.<p>
1.21 deraadt 1454:
1.45 deraadt 1455: People who are really concerned with security can do a number of
1456: things:<p>
1.21 deraadt 1457:
1458: <ul>
1459: <li>If you understand security issues, watch our
1.294 david 1460: <a href="mail.html">source-changes mailing list</a> and keep an
1.23 deraadt 1461: eye out for things which appear security related. Since
1.21 deraadt 1462: exploitability is not proven for many of the fixes we make,
1463: do not expect the relevant commit message to say "SECURITY FIX!".
1464: If a problem is proven and serious, a patch will be available
1465: here very shortly after.
1.161 horacio 1466: <li>In addition to source changes, you can watch our <a href="mail.html">
1.160 ericj 1467: security-announce mailing list</a> which will notify you for every
1.186 ian 1468: security related item that the OpenBSD team deems as a possible threat,
1.160 ericj 1469: and instruct you on how to patch the problem.
1.21 deraadt 1470: <li>Track our current source code tree, and teach yourself how to do a
1.29 deraadt 1471: complete system build from time to time (read /usr/src/Makefile
1472: carefully). Users can make the assumption that the current
1473: source tree always has stronger security than the previous release.
1.45 deraadt 1474: However, building your own system from source code is not trivial;
1.265 miod 1475: it is nearly 600MB of source code, and problems do occur as we
1.45 deraadt 1476: transition between major releases.
1.115 ericj 1477: <li>Install a binary snapshot for your
1.80 espie 1478: architecture, which are made available fairly often. For
1.29 deraadt 1479: instance, an i386 snapshot is typically made available weekly.
1.21 deraadt 1480: </ul>
1481:
1.9 deraadt 1482: <p>
1.288 matthieu 1483: <a name="reporting"></a>
1.294 david 1484: <li><h3><font color="#e00000">Reporting problems</font></h3><p>
1.3 deraadt 1485:
1.5 deraadt 1486: <p> If you find a new security problem, you can mail it to
1.294 david 1487: <a href="mailto:deraadt@openbsd.org">deraadt@openbsd.org</a>.
1.7 deraadt 1488: <br>
1.5 deraadt 1489: If you wish to PGP encode it (but please only do so if privacy is very
1.112 philen 1490: urgent, since it is inconvenient) use this <a href="advisories/pgpkey.txt">pgp key</a>.
1.5 deraadt 1491:
1.107 deraadt 1492: <p>
1.288 matthieu 1493: <a name="papers"></a>
1.294 david 1494: <li><h3><font color="#e00000">Further Reading</font></h3><p>
1.107 deraadt 1495:
1496: A number of papers have been written by OpenBSD team members, about security
1497: related changes they have done in OpenBSD. The postscript versions of these
1.108 deraadt 1498: documents are available as follows.<p>
1.107 deraadt 1499:
1500: <ul>
1.113 deraadt 1501: <li>A Future-Adaptable Password Scheme.<br>
1.294 david 1502: <a href="events.html#usenix99">Usenix 1999</a>,
1503: by <a href="mailto:provos@openbsd.org">Niels Provos</a>,
1504: <a href="mailto:dm@openbsd.org">David Mazieres</a>.<br>
1505: <a href="papers/bcrypt-paper.ps">paper</a> and
1506: <a href="papers/bcrypt-slides.ps">slides</a>.
1.113 deraadt 1507: <p>
1508: <li>Cryptography in OpenBSD: An Overview.<br>
1.294 david 1509: <a href="events.html#usenix99">Usenix 1999</a>,
1510: by <a href="mailto:deraadt@openbsd.org">Theo de Raadt</a>,
1511: <a href="mailto:niklas@openbsd.org">Niklas Hallqvist</a>,
1512: <a href="mailto:art@openbsd.org">Artur Grabowski</a>,
1513: <a href="mailto:angelos@openbsd.org">Angelos D. Keromytis</a>,
1514: <a href="mailto:provos@openbsd.org">Niels Provos</a>.<br>
1515: <a href="papers/crypt-paper.ps">paper</a> and
1516: <a href="papers/crypt-slides.ps">slides</a>.
1.113 deraadt 1517: <p>
1518: <li>strlcpy and strlcat -- consistent, safe, string copy and concatenation.<br>
1.294 david 1519: <a href="events.html#usenix99">Usenix 1999</a>,
1520: by <a href="mailto:millert@openbsd.org">Todd C. Miller</a>,
1521: <a href="mailto:deraadt@openbsd.org">Theo de Raadt</a>.<br>
1522: <a href="papers/strlcpy-paper.ps">paper</a> and
1523: <a href="papers/strlcpy-slides.ps">slides</a>.
1.113 deraadt 1524: <p>
1.118 deraadt 1525: <li>Dealing with Public Ethernet Jacks-Switches, Gateways, and Authentication.<br>
1.294 david 1526: <a href="events.html#lisa99">LISA 1999</a>,
1527: by <a href="mailto:beck@openbsd.org">Bob Beck</a>.<br>
1528: <a href="papers/authgw-paper.ps">paper</a> and
1529: <a href="papers/authgw-slides.ps">slides</a>.
1.118 deraadt 1530: <p>
1.153 jufi 1531: <li>Encrypting Virtual Memory<br>
1.294 david 1532: <a href="events.html#sec2000">Usenix Security 2000</a>,
1533: <a href="mailto:provos@openbsd.org">Niels Provos</a>.<br>
1534: <a href="papers/swapencrypt.ps">paper</a> and
1535: <a href="papers/swapencrypt-slides.ps">slides</a>.
1.142 deraadt 1536: <p>
1.107 deraadt 1537: </ul>
1.294 david 1538: </ul>
1.106 deraadt 1539:
1.2 deraadt 1540: <hr>
1.294 david 1541: <a href="index.html"><img height=24 width=24 src="back.gif" border=0 alt="OpenBSD"></a>
1542: <a href="mailto:www@openbsd.org">www@openbsd.org</a>
1.24 deraadt 1543: <br>
1.338 ! miod 1544: <small>$OpenBSD: security.html,v 1.337 2006/11/20 01:35:19 deraadt Exp $</small>
1.1 deraadt 1545:
1.24 deraadt 1546: </body>
1547: </html>
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