Annotation of www/security.html, Revision 1.336
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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>
1.336 ! brad 236: <li><a href="errata.html#ldso">Nov 19, 2006:
! 237: ld.so(1) fails to properly sanitize the environement.</a>
1.335 deraadt 238: <li><a href="errata.html#systrace">Nov 4, 2006:
1.334 brad 239: Fix for an integer overflow in systrace(4)'s STRIOCREPLACE support,
240: found by Chris Evans.</a>
1.335 deraadt 241: <li><a href="errata.html#openssl">Nov 4, 2006:
1.334 brad 242: Several problems have been found in OpenSSL.</a>
1.335 deraadt 243: <li><a href="errata.html#httpd">Nov 4, 2006:
1.334 brad 244: httpd(8) does not sanitize the Expect header from an HTTP request
245: when it is reflected back in an error message, which might allow
246: cross-site scripting (XSS) style attacks.</a>
247: </ul>
248:
249: <li>
1.321 brad 250: <a name="39"></a>
251:
252: <h3><font color="#e00000">OpenBSD 3.9 Security Advisories</font></h3>
253: These are the OpenBSD 3.9 advisories -- all these problems are solved
254: in <a href=anoncvs.html>OpenBSD current</a> and the
255: <a href=stable.html>patch branch</a>.
256:
257: <p>
258: <ul>
1.336 ! brad 259: <li><a href="errata39.html#ldso">Nov 19, 2006:
! 260: ld.so(1) fails to properly sanitize the environement.</a>
1.333 deraadt 261: <li><a href="errata39.html#ssh">Oct 12, 2006:
1.332 brad 262: Fix 2 security bugs found in OpenSSH.</a>
1.333 deraadt 263: <li><a href="errata39.html#systrace">Oct 7, 2006:
1.331 brad 264: Fix for an integer overflow in systrace(4)'s STRIOCREPLACE support,
1.330 brad 265: found by Chris Evans.</a>
1.333 deraadt 266: <li><a href="errata39.html#openssl2">Oct 7, 2006:
1.330 brad 267: Several problems have been found in OpenSSL.</a>
1.333 deraadt 268: <li><a href="errata39.html#httpd2">Oct 7, 2006:
1.330 brad 269: httpd(8) does not sanitize the Expect header from an HTTP request
270: when it is reflected back in an error message, which might allow
271: cross-site scripting (XSS) style attacks.</a>
1.333 deraadt 272: <li><a href="errata39.html#openssl">Sep 8, 2006:
1.329 brad 273: Due to incorrect PKCS#1 v1.5 padding validation in OpenSSL, it is
274: possible for an attacker to construct an invalid signature which
275: OpenSSL would accept as a valid PKCS#1 v1.5 signature.</a>
1.333 deraadt 276: <li><a href="errata39.html#bind">Sep 8, 2006:
1.328 brad 277: Two Denial of Service issues have been found with BIND.</a>
1.333 deraadt 278: <li><a href="errata39.html#sppp">Sep 2, 2006:
1.327 brad 279: Due to the failure to correctly validate LCP configuration option
280: lengths, it is possible for an attacker to send LCP packets via an
281: sppp(4) connection causing the kernel to panic.</a>
1.333 deraadt 282: <li><a href="errata39.html#isakmpd">Aug 25, 2006:
1.326 brad 283: A problem in isakmpd(8) caused IPsec to run partly without replay
284: protection.</a>
1.333 deraadt 285: <li><a href="errata39.html#sem">Aug 25, 2006:
1.326 brad 286: It is possible to cause the kernel to panic when more than the default
287: number of sempahores have been allocated.</a>
1.333 deraadt 288: <li><a href="errata39.html#dhcpd">Aug 25, 2006:
1.326 brad 289: Due to an off-by-one error in dhcpd(8) it is possible to cause dhcpd(8)
290: to exit by sending a DHCPDISCOVER packet with a 32-byte client identifier
291: option.</a>
1.333 deraadt 292: <li><a href="errata39.html#sendmail3">Aug 25, 2006:
1.326 brad 293: A potential denial of service problem has been found in sendmail.</a>
1.333 deraadt 294: <li><a href="errata39.html#httpd">Jul 30, 2006:
1.325 brad 295: httpd(8)'s mod_rewrite has a potentially exploitable off-by-one buffer
296: overflow.</a>
1.333 deraadt 297: <li><a href="errata39.html#sendmail2">Jun 15, 2006:
1.324 brad 298: A potential denial of service problem has been found in sendmail.</a>
1.333 deraadt 299: <li><a href="errata39.html#xorg">May 2, 2006:
1.322 brad 300: A buffer overflow exists in the Render extension of the X server.</a>
1.333 deraadt 301: <li><a href="errata39.html#sendmail">Mar 25, 2006:
1.321 brad 302: A race condition has been reported to exist in the handling by sendmail
303: of asynchronous signals.</a>
304: </ul>
305:
306: <li>
1.318 deraadt 307: <a name="38"></a>
308:
309: <h3><font color="#e00000">OpenBSD 3.8 Security Advisories</font></h3>
310: These are the OpenBSD 3.8 advisories -- all these problems are solved
311: in <a href=anoncvs.html>OpenBSD current</a> and the
312: <a href=stable.html>patch branch</a>.
313:
314: <p>
315: <ul>
1.332 brad 316: <li><a href="errata38.html#ssh2">Oct 12, 2006:
317: Fix 2 security bugs found in OpenSSH.</a>
1.330 brad 318: <li><a href="errata38.html#systrace">Oct 7, 2006:
1.331 brad 319: Fix for an integer overflow in systrace(4)'s STRIOCREPLACE support,
1.330 brad 320: found by Chris Evans.</a>
321: <li><a href="errata38.html#openssl2">Oct 7, 2006:
322: Several problems have been found in OpenSSL.</a>
323: <li><a href="errata38.html#httpd2">Oct 7, 2006:
324: httpd(8) does not sanitize the Expect header from an HTTP request
325: when it is reflected back in an error message, which might allow
326: cross-site scripting (XSS) style attacks.</a>
1.329 brad 327: <li><a href="errata38.html#openssl">Sep 8, 2006:
328: Due to incorrect PKCS#1 v1.5 padding validation in OpenSSL, it is
329: possible for an attacker to construct an invalid signature which
330: OpenSSL would accept as a valid PKCS#1 v1.5 signature.</a>
1.328 brad 331: <li><a href="errata38.html#bind">Sep 8, 2006:
332: Two Denial of Service issues have been found with BIND.</a>
1.327 brad 333: <li><a href="errata38.html#sppp">Sep 2, 2006:
334: Due to the failure to correctly validate LCP configuration option
335: lengths, it is possible for an attacker to send LCP packets via an
336: sppp(4) connection causing the kernel to panic.</a>
1.326 brad 337: <li><a href="errata38.html#isakmpd">Aug 25, 2006:
338: A problem in isakmpd(8) caused IPsec to run partly without replay
339: protection.</a>
340: <li><a href="errata38.html#sem">Aug 25, 2006:
341: It is possible to cause the kernel to panic when more than the default
342: number of sempahores have been allocated.</a>
343: <li><a href="errata38.html#dhcpd">Aug 25, 2006:
344: Due to an off-by-one error in dhcpd(8) it is possible to cause dhcpd(8)
345: to exit by sending a DHCPDISCOVER packet with a 32-byte client identifier
346: option.</a>
347: <li><a href="errata38.html#sendmail3">Aug 25, 2006:
348: A potential denial of service problem has been found in sendmail.</a>
1.325 brad 349: <li><a href="errata38.html#httpd">Jul 30, 2006:
350: httpd(8)'s mod_rewrite has a potentially exploitable off-by-one buffer
351: overflow.</a>
1.324 brad 352: <li><a href="errata38.html#sendmail2">Jun 15, 2006:
353: A potential denial of service problem has been found in sendmail.</a>
1.322 brad 354: <li><a href="errata38.html#xorg">May 2, 2006:
355: A buffer overflow exists in the Render extension of the X server.</a>
1.321 brad 356: <li><a href="errata38.html#sendmail">Mar 25, 2006:
357: A race condition has been reported to exist in the handling by sendmail
358: of asynchronous signals.</a>
359: <li><a href="errata38.html#ssh">Feb 12, 2006:
1.320 brad 360: Josh Bressers has reported a weakness in OpenSSH caused due to the
361: insecure use of the system(3) function in scp(1) when performing copy
362: operations using filenames that are supplied by the user from the
363: command line.</a>
1.321 brad 364: <li><a href="errata38.html#fd">Jan 5, 2006:
1.319 brad 365: Do not allow users to trick suid programs into re-opening files via
366: /dev/fd.</a>
1.321 brad 367: <li><a href="errata38.html#perl">Jan 5, 2006:
1.319 brad 368: A buffer overflow has been found in the Perl interpreter with the
369: sprintf function which may be exploitable under certain conditions.</a>
1.318 deraadt 370: </ul>
371:
1.323 steven 372: <p>
373: OpenBSD 3.7 and earlier releases are not supported anymore. The following
374: paragraphs only list advisories issued while they were maintained; these
375: releases are likely to be affected by the advisories for more recent releases.
376: <br>
377:
1.318 deraadt 378: <li>
1.312 david 379: <a name="37"></a>
380:
381: <h3><font color="#e00000">OpenBSD 3.7 Security Advisories</font></h3>
382: These are the OpenBSD 3.7 advisories -- all these problems are solved
1.323 steven 383: in <a href="anoncvs.html">OpenBSD current</a>. The
384: <a href="stable.html">patch branch</a> for 3.7 is no longer being maintained,
385: you should update your machine.
1.312 david 386:
387: <p>
388: <ul>
1.322 brad 389: <li><a href="errata37.html#xorg">May 2, 2006:
390: A buffer overflow exists in the Render extension of the X server.</a>
1.321 brad 391: <li><a href="errata37.html#sendmail">Mar 25, 2006:
392: A race condition has been reported to exist in the handling by sendmail
393: of asynchronous signals.</a>
1.320 brad 394: <li><a href="errata37.html#ssh">Feb 12, 2006:
395: Josh Bressers has reported a weakness in OpenSSH caused due to the
396: insecure use of the system(3) function in scp(1) when performing copy
397: operations using filenames that are supplied by the user from the
398: command line.</a>
1.319 brad 399: <li><a href="errata37.html#fd">Jan 5, 2006:
400: Do not allow users to trick suid programs into re-opening files via
401: /dev/fd.</a>
402: <li><a href="errata37.html#perl">Jan 5, 2006:
403: A buffer overflow has been found in the Perl interpreter with the
404: sprintf function which may be exploitable under certain conditions.</a>
1.318 deraadt 405: <li><a href="errata37.html#libz2">Jul 21, 2005:
1.317 millert 406: Fix another buffer overflow in the zlib library that may be exploitable.</a>
1.318 deraadt 407: <li><a href="errata37.html#libz">Jul 6, 2005:
1.316 millert 408: Fix a buffer overflow in the zlib library that may be exploitable.</a>
1.318 deraadt 409: <li><a href="errata37.html#sudo">Jun 20, 2005:
1.316 millert 410: Fix a race condition in sudo(8) that could allow a user
1.315 millert 411: to run arbitrary commands.</a>
1.318 deraadt 412: <li><a href="errata37.html#cvs">Jun 7, 2005:
1.313 brad 413: Fix a buffer overflow, memory leaks, and NULL pointer
414: dereference in cvs(1).</a>
1.312 david 415: </ul>
416:
417: <li>
1.301 miod 418: <a name="36"></a>
419:
420: <h3><font color="#e00000">OpenBSD 3.6 Security Advisories</font></h3>
421: These are the OpenBSD 3.6 advisories -- all these problems are solved
1.323 steven 422: in <a href="anoncvs.html">OpenBSD current</a>. The
423: <a href="stable.html">patch branch</a> for 3.6 is no longer being maintained,
424: you should update your machine.
1.301 miod 425:
426: <p>
1.302 markus 427: <ul>
1.317 millert 428: <li><a href="errata36.html#libz2">Jul 21, 2005:
429: Fix another buffer overflow in the zlib library that may be exploitable.</a>
1.316 millert 430: <li><a href="errata36.html#libz">Jul 6, 2005:
431: Fix a buffer overflow in the zlib library that may be exploitable.</a>
1.315 millert 432: <li><a href="errata36.html#sudo">Jun 20, 2005:
1.316 millert 433: Fix a race condition in sudo(8) that could allow a user
1.315 millert 434: to run arbitrary commands.</a>
1.311 deraadt 435: <li><a href="errata36.html#cvs">Apr 28, 2005:
1.310 brad 436: Fix a buffer overflow, memory leaks, and NULL pointer
437: dereference in cvs(1).</a>
1.311 deraadt 438: <li><a href="errata36.html#telnet">Mar 30, 2005:
1.309 brad 439: Due to buffer overflows in telnet(1), a malicious
440: server or man-in-the-middle attack could allow
441: execution of arbitrary code with the privileges of
442: the user invoking telnet(1).</a>
1.311 deraadt 443: <li><a href="errata36.html#copy">Mar 16, 2005:
1.307 brad 444: More stringent checking should be done in the copy(9)
445: functions to prevent their misuse.</a>
1.311 deraadt 446: <li><a href="errata36.html#locore">Feb 28, 2005:
1.306 brad 447: More stringent checking should be done in the copy(9)
448: functions to prevent their misuse.</a>
1.311 deraadt 449: <li><a href="errata36.html#httpd">Jan 12, 2005:
1.304 brad 450: httpd(8)'s mod_include module fails to properly validate
451: the length of user supplied tag strings prior to copying
1.305 brad 452: them to a local buffer, causing a buffer overflow.</a>
1.311 deraadt 453: <li><a href="errata36.html#pfkey">Dec 14, 2004:
1.302 markus 454: On systems running isakmpd(8) it is possible for a local
455: user to cause kernel memory corruption and system panic by
1.303 markus 456: setting ipsec(4) credentials on a socket.</a>
1.302 markus 457: </ul>
1.301 miod 458:
459: <li>
1.288 matthieu 460: <a name="35"></a>
1.279 deraadt 461:
1.294 david 462: <h3><font color="#e00000">OpenBSD 3.5 Security Advisories</font></h3>
1.279 deraadt 463: These are the OpenBSD 3.5 advisories -- all these problems are solved
1.314 miod 464: in <a href="anoncvs.html">OpenBSD current</a>. The
465: <a href="stable.html">patch branch</a> for 3.5 is no longer being maintained,
466: you should update your machine.
1.279 deraadt 467:
468: <p>
469: <ul>
1.310 brad 470: <li><a href="errata35.html#cvs4">Apr 28, 2005:
471: Fix a buffer overflow, memory leaks, and NULL pointer
472: dereference in cvs(1).</a>
1.309 brad 473: <li><a href="errata35.html#telnet">Mar 30, 2005:
474: Due to buffer overflows in telnet(1), a malicious
475: server or man-in-the-middle attack could allow
476: execution of arbitrary code with the privileges of
477: the user invoking telnet(1).</a>
1.308 brad 478: <li><a href="errata35.html#copy">Mar 16, 2005:
1.307 brad 479: More stringent checking should be done in the copy(9)
480: functions to prevent their misuse.</a>
1.306 brad 481: <li><a href="errata35.html#locore">Feb 28, 2005:
482: More stringent checking should be done in the copy(9)
483: functions to prevent their misuse.</a>
1.304 brad 484: <li><a href="errata35.html#httpd3">Jan 12, 2005:
485: httpd(8)'s mod_include module fails to properly validate
486: the length of user supplied tag strings prior to copying
1.305 brad 487: them to a local buffer, causing a buffer overflow.</a>
1.302 markus 488: <li><a href="errata35.html#pfkey">Dec 14, 2004:
489: On systems running isakmpd(8) it is possible for a local
490: user to cause kernel memory corruption and system panic by
1.303 markus 491: setting ipsec(4) credentials on a socket.</a>
1.301 miod 492: <li><a href="errata35.html#radius">Sep 20, 2004:
1.299 millert 493: Radius-based authentication is vulnerable to spoofed replies.</a>
1.301 miod 494: <li><a href="errata35.html#xpm">Sep 16, 2004:
1.298 brad 495: The Xpm library has vulnerabilities when parsing malicious images.</a>
1.301 miod 496: <li><a href="errata35.html#httpd2"> Sep 10, 2004:
1.297 brad 497: httpd(8)'s mod_rewrite module can be made to write one zero byte in
498: an arbitrary memory position outside of a char array, causing a DoS
499: or possibly buffer overflows.</a>
1.301 miod 500: <li><a href="errata35.html#httpd"> Jun 12, 2004:
1.300 deraadt 501: Multiple vulnerabilities have been found in httpd(8) / mod_ssl.</a>
1.301 miod 502: <li><a href="errata35.html#isakmpd"> Jun 10, 2004:
1.291 hshoexer 503: isakmpd(8) still has issues with unauthorized SA deletion,
1.293 brad 504: an attacker can delete IPsec tunnels at will.</a>
1.301 miod 505: <li><a href="errata35.html#cvs3"> Jun 9, 2004:
1.290 millert 506: Multiple remote vulnerabilities have been found in the cvs(1)
507: server which can be used by CVS clients to crash or execute
1.293 brad 508: arbitrary code on the server.</a>
1.301 miod 509: <li><a href="errata35.html#kerberos"> May 30, 2004:
1.289 beck 510: kdc(8) performs inadequate checking of request fields, leading
511: to the possibility of principal impersonation from other
512: Kerberos realms if they are trusted with a cross-realm trust.</a>
1.301 miod 513: <li><a href="errata35.html#xdm"> May 26, 2004:
1.287 matthieu 514: xdm(1) ignores the requestPort resource and creates a
1.293 brad 515: listening socket regardless of the setting in xdm-config.</a>
1.301 miod 516: <li><a href="errata35.html#cvs2"> May 20, 2004:
1.286 otto 517: A buffer overflow in the cvs(1) server has been found,
518: which can be used by CVS clients to execute arbitrary code on
1.293 brad 519: the server.</a>
1.301 miod 520: <li><a href="errata35.html#procfs"> May 13, 2004:
1.282 tedu 521: Integer overflow problems were found in procfs, allowing
1.293 brad 522: reading of arbitrary kernel memory.</a>
1.301 miod 523: <li><a href="errata35.html#cvs"> May 5, 2004:
1.281 otto 524: Pathname validation problems have been found in cvs(1),
525: allowing clients and servers access to files outside the
1.293 brad 526: repository or local CVS tree.</a>
1.279 deraadt 527: </ul>
528:
529: <p>
530: <li>
1.288 matthieu 531: <a name="34"></a>
1.261 david 532:
1.294 david 533: <h3><font color="#e00000">OpenBSD 3.4 Security Advisories</font></h3>
1.261 david 534: These are the OpenBSD 3.4 advisories -- all these problems are solved
1.301 miod 535: in <a href="anoncvs.html">OpenBSD current</a>. The
536: <a href="stable.html">patch branch</a> for 3.4 is no longer being maintained,
537: you should update your machine.
1.261 david 538: <p>
539: <ul>
1.302 markus 540: <li><a href="errata34.html#pfkey">Dec 14, 2004:
541: On systems running isakmpd(8) it is possible for a local
542: user to cause kernel memory corruption and system panic by
1.303 markus 543: setting ipsec(4) credentials on a socket.</a>
1.298 brad 544: <li><a href="errata34.html#xpm">Sep 16, 2004:
545: The Xpm library has vulnerabilities when parsing malicious images.</a>
1.297 brad 546: <li><a href="errata34.html#httpd4"> Sep 10, 2004:
547: httpd(8)'s mod_rewrite module can be made to write one zero byte in
548: an arbitrary memory position outside of a char array, causing a DoS
549: or possibly buffer overflows.</a>
1.294 david 550: <li><a href="errata34.html#httpd3"> Jun 12, 2004:
1.300 deraadt 551: Multiple vulnerabilities have been found in httpd(8) / mod_ssl.</a>
1.294 david 552: <li><a href="errata34.html#isakmpd3"> Jun 10, 2004:
1.292 brad 553: isakmpd(8) still has issues with unauthorized SA deletion,
1.293 brad 554: an attacker can delete IPsec tunnels at will.</a>
1.294 david 555: <li><a href="errata34.html#cvs3"> Jun 9, 2004:
1.290 millert 556: Multiple remote vulnerabilities have been found in the cvs(1)
557: server which can be used by CVS clients to crash or execute
1.293 brad 558: arbitrary code on the server.</a>
1.294 david 559: <li><a href="errata34.html#kerberos"> May 30, 2004:
1.289 beck 560: kdc(8) performs inadequate checking of request fields, leading
561: to the possibility of principal impersonation from other
562: Kerberos realms if they are trusted with a cross-realm trust.</a>
1.294 david 563: <li><a href="errata34.html#cvs2"> May 20, 2004:
1.286 otto 564: A buffer overflow in the cvs(1) server has been found,
565: which can be used by CVS clients to execute arbitrary code on
566: the server.</a>
1.294 david 567: <li><a href="errata34.html#procfs"> May 13, 2004:
1.282 tedu 568: Integer overflow problems were found in procfs, allowing
569: reading of arbitrary kernel memory.</a>
1.294 david 570: <li><a href="errata34.html#cvs"> May 5, 2004:
1.281 otto 571: Pathname validation problems have been found in cvs(1),
572: allowing clients and servers access to files outside the
573: repository or local CVS tree.</a>
1.294 david 574: <li><a href="errata34.html#openssl"> March 17, 2004:
1.277 millert 575: A missing check for a NULL-pointer dereference may allow a
1.281 otto 576: remote attacker to crash applications using OpenSSL.</a>
1.294 david 577: <li><a href="errata34.html#isakmpd2"> March 17, 2004:
1.276 brad 578: Defects in the payload validation and processing functions of
579: isakmpd have been discovered. An attacker could send malformed
580: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.294 david 581: <li><a href="errata34.html#httpd2"> March 13, 2004:
1.275 brad 582: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
583: access module, using IP addresses without a netmask on big endian
584: 64-bit platforms causes the rules to fail to match.</a>
1.294 david 585: <li><a href="errata34.html#ip6"> February 8, 2004:
1.272 dhartmei 586: An IPv6 MTU handling problem exists that could be used by an
587: attacker to cause a denial of service attack.</a>
1.294 david 588: <li><a href="errata34.html#sysvshm"> February 5, 2004:
1.271 millert 589: A reference counting bug in shmat(2) could be used to write to
590: kernel memory under certain circumstances.</a>
1.294 david 591: <li><a href="errata34.html#isakmpd">January 13, 2004:
1.266 brad 592: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 593: by Thomas Walpuski.</a>
1.294 david 594: <li><a href="errata34.html#ibcs2">November 17, 2003:
1.264 henning 595: It may be possible for a local user to overrun the stack in
596: compat_ibcs2(8) and cause a kernel panic.</a>
1.294 david 597: <li><a href="errata34.html#asn1">November 1, 2003:
1.262 margarid 598: The use of certain ASN.1 encodings or malformed public keys may
599: allow an attacker to mount a denial of service attack against
600: applications linked with ssl(3).</a>
1.261 david 601: </ul>
602:
603: <li>
1.288 matthieu 604: <a name="33"></a>
1.246 deraadt 605:
1.294 david 606: <h3><font color="#e00000">OpenBSD 3.3 Security Advisories</font></h3>
1.246 deraadt 607: These are the OpenBSD 3.3 advisories -- all these problems are solved
1.294 david 608: in <a href="anoncvs.html">OpenBSD current</a>. The
609: <a href="stable.html">patch branch</a> for 3.3 is no longer being maintained,
1.284 otto 610: you should update your machine.
1.246 deraadt 611: <p>
612: <ul>
1.294 david 613: <li><a href="errata33.html#cvs"> May 5, 2004:
1.281 otto 614: Pathname validation problems have been found in cvs(1),
615: allowing clients and servers access to files outside the
616: repository or local CVS tree.</a>
1.294 david 617: <li><a href="errata33.html#openssl"> March 17, 2004:
1.277 millert 618: A missing check for a NULL-pointer dereference may allow a
1.281 otto 619: remote attacker to crash applications using OpenSSL.</a>
1.294 david 620: <li><a href="errata33.html#isakmpd2"> March 17, 2004:
1.276 brad 621: Defects in the payload validation and processing functions of
622: isakmpd have been discovered. An attacker could send malformed
623: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.294 david 624: <li><a href="errata33.html#httpd2"> March 13, 2004:
1.275 brad 625: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
626: access module, using IP addresses without a netmask on big endian
627: 64-bit platforms causes the rules to fail to match.</a>
1.294 david 628: <li><a href="errata33.html#ip6"> February 8, 2004:
1.275 brad 629: An IPv6 MTU handling problem exists that could be used by an
630: attacker to cause a denial of service attack.</a>
1.294 david 631: <li><a href="errata33.html#sysvshm"> February 5, 2004:
1.271 millert 632: A reference counting bug in shmat(2) could be used to write to
633: kernel memory under certain circumstances.</a>
1.294 david 634: <li><a href="errata33.html#isakmpd">January 15, 2004:
1.268 brad 635: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 636: by Thomas Walpuski.</a>
1.294 david 637: <li><a href="errata33.html#ibcs2">November 17, 2003:
1.264 henning 638: It may be possible for a local user to execute arbitrary code
639: resulting in escalation of privileges due to a stack overrun
640: in compat_ibcs2(8).</a>
1.294 david 641: <li><a href="errata33.html#asn1">October 1, 2003:
1.257 millert 642: The use of certain ASN.1 encodings or malformed public keys may
643: allow an attacker to mount a denial of service attack against
644: applications linked with ssl(3).</a>
1.294 david 645: <li><a href="errata33.html#pfnorm">September 24, 2003:
1.258 beck 646: Access of freed memory in pf(4) could be used to
1.260 margarid 647: remotely panic a machine using scrub rules.</a>
1.294 david 648: <li><a href="errata33.html#sendmail">September 17, 2003:
1.256 millert 649: A buffer overflow in the address parsing in
650: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 651: <li><a href="errata33.html#sshbuffer">September 16, 2003:
1.255 millert 652: OpenSSH versions prior to 3.7 contains a buffer management error
653: that is potentially exploitable.</a>
1.294 david 654: <li><a href="errata33.html#sysvsem">September 10, 2003:
1.254 millert 655: Root may be able to reduce the security level by taking advantage of
656: an integer overflow when the semaphore limits are made very large.</a>
1.294 david 657: <li><a href="errata33.html#semget">August 20, 2003:
1.252 millert 658: An improper bounds check in the kernel may allow a local user
659: to panic the kernel.</a>
1.294 david 660: <li><a href="errata33.html#realpath">August 4, 2003:
1.249 millert 661: An off-by-one error exists in the C library function realpath(3)
662: may allow an attacker to gain escalated privileges.</a>
1.246 deraadt 663: </ul>
664:
1.265 miod 665:
1.247 david 666: <p>
1.246 deraadt 667: <li>
1.288 matthieu 668: <a name="32"></a>
1.224 deraadt 669:
1.294 david 670: <h3><font color="#e00000">OpenBSD 3.2 Security Advisories</font></h3>
1.224 deraadt 671: These are the OpenBSD 3.2 advisories -- all these problems are solved
1.294 david 672: in <a href="anoncvs.html">OpenBSD current</a>. The
673: <a href="stable.html">patch branch</a> for 3.2 is no longer being maintained,
1.265 miod 674: you should update your machine.
1.224 deraadt 675: <p>
676: <ul>
1.294 david 677: <li><a href="errata32.html#asn1">October 1, 2003:
1.257 millert 678: The use of certain ASN.1 encodings or malformed public keys may
679: allow an attacker to mount a denial of service attack against
680: applications linked with ssl(3). This does not affect OpenSSH.</a>
1.294 david 681: <li><a href="errata32.html#pfnorm">September 24, 2003:
1.258 beck 682: Access of freed memory in pf(4) could be used to
1.260 margarid 683: remotely panic a machine using scrub rules.</a>
1.294 david 684: <li><a href="errata32.html#sendmail4">September 17, 2003:
1.256 millert 685: A buffer overflow in the address parsing in
686: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 687: <li><a href="errata32.html#sshbuffer">September 16, 2003:
1.255 millert 688: OpenSSH versions prior to 3.7 contains a buffer management error
689: that is potentially exploitable.</a>
1.294 david 690: <li><a href="errata32.html#sendmail3">August 25, 2003:
1.253 brad 691: Fix for a potential security issue in
692: sendmail(8) with respect to DNS maps.</a>
1.294 david 693: <li><a href="errata32.html#realpath">August 4, 2003:
1.249 millert 694: An off-by-one error exists in the C library function realpath(3)
695: may allow an attacker to gain escalated privileges.</a>
1.294 david 696: <li><a href="errata32.html#sendmail2">March 31, 2003:
1.244 miod 697: A buffer overflow in the address parsing in
698: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 699: <li><a href="errata32.html#kerberos">March 24, 2003:
1.242 millert 700: A cryptographic weaknesses in the Kerberos v4 protocol can be
701: exploited on Kerberos v5 as well.</a>
1.294 david 702: <li><a href="errata32.html#kpr">March 19, 2003:
1.241 jufi 703: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 704: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.294 david 705: <li><a href="errata32.html#blinding">March 18, 2003:
1.239 miod 706: Various SSL and TLS operations in OpenSSL are vulnerable to
707: timing attacks.</a>
1.294 david 708: <li><a href="errata32.html#lprm">March 5, 2003:
1.238 millert 709: A buffer overflow in lprm(1) may allow an attacker to elevate
710: privileges to user daemon.</a>.
1.294 david 711: <li><a href="errata32.html#sendmail">March 3, 2003:
1.237 miod 712: A buffer overflow in the envelope comments processing in
713: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 714: <li><a href="errata32.html#httpd">February 25, 2003:
1.236 margarid 715: httpd(8) leaks file inode numbers via ETag header as well as
716: child PIDs in multipart MIME boundary generation. This could
717: lead, for example, to NFS exploitation because it uses inode
718: numbers as part of the file handle.</a>
1.294 david 719: <li><a href="errata32.html#ssl">February 22, 2003:
1.234 margarid 720: In ssl(8) an information leak can occur via timing by performing
721: a MAC computation even if incorrect block cipher padding has
722: been found, this is a countermeasure. Also, check for negative
723: sizes, in allocation routines.</a>
1.294 david 724: <li><a href="errata32.html#cvs">January 20, 2003:
1.232 millert 725: A double free exists in cvs(1) that could lead to privilege
726: escalation for cvs configurations where the cvs command is
1.233 margarid 727: run as a privileged user.</a>
1.294 david 728: <li><a href="errata32.html#named">November 14, 2002:
1.230 millert 729: A buffer overflow exists in named(8) that could lead to a
730: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 731: <li><a href="errata32.html#pool">November 6, 2002:
1.233 margarid 732: A logic error in the pool kernel memory allocator could cause
733: memory corruption in low-memory situations, causing the system
734: to crash.</a>
1.294 david 735: <li><a href="errata32.html#smrsh">November 6, 2002:
1.229 miod 736: An attacker can bypass smrsh(8)'s restrictions and execute
737: arbitrary commands with the privileges of his own account.</a>
1.294 david 738: <li><a href="errata32.html#pfbridge">November 6, 2002:
1.233 margarid 739: Network bridges running pf with scrubbing enabled could cause
740: mbuf corruption, causing the system to crash.</a>
1.294 david 741: <li><a href="errata32.html#kadmin">October 21, 2002:
1.228 miod 742: A buffer overflow can occur in the kadmind(8) daemon, leading
743: to possible remote crash or exploit.</a>
1.224 deraadt 744: </ul>
745:
1.227 miod 746: <p>
747: <li>
1.288 matthieu 748: <a name="31"></a>
1.203 deraadt 749:
1.294 david 750: <h3><font color="#e00000">OpenBSD 3.1 Security Advisories</font></h3>
1.203 deraadt 751: These are the OpenBSD 3.1 advisories -- all these problems are solved
1.294 david 752: in <a href="anoncvs.html">OpenBSD current</a>. The
753: <a href="stable.html">patch branch</a> for 3.1 is no longer being maintained,
1.258 beck 754: you should update your machine.
1.203 deraadt 755:
756: <p>
757: <ul>
1.294 david 758: <li><a href="errata31.html#sendmail2">March 31, 2003:
1.244 miod 759: A buffer overflow in the address parsing in
760: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 761: <li><a href="errata31.html#kerberos">March 24, 2003:
1.242 millert 762: A cryptographic weaknesses in the Kerberos v4 protocol can be
763: exploited on Kerberos v5 as well.</a>
1.294 david 764: <li><a href="errata31.html#kpr">March 19, 2003:
1.241 jufi 765: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 766: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.294 david 767: <li><a href="errata31.html#blinding">March 18, 2003:
1.239 miod 768: Various SSL and TLS operations in OpenSSL are vulnerable to
769: timing attacks.</a>
1.294 david 770: <li><a href="errata31.html#lprm">March 4, 2003:
1.238 millert 771: A buffer overflow in lprm(1) may allow an attacker to gain
772: root privileges.</a>
1.294 david 773: <li><a href="errata31.html#sendmail">March 3, 2003:
1.237 miod 774: A buffer overflow in the envelope comments processing in
775: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 776: <li><a href="errata31.html#ssl2">February 23, 2003:
1.235 miod 777: In ssl(8) an information leak can occur via timing by performing
778: a MAC computation even if incorrect block cipher padding has
779: been found, this is a countermeasure. Also, check for negative
780: sizes, in allocation routines.</a>
1.294 david 781: <li><a href="errata31.html#cvs">January 20, 2003:
1.232 millert 782: A double free exists in cvs(1) that could lead to privilege
783: escalation for cvs configurations where the cvs command is
1.294 david 784: run as a privileged user</a>.
785: <li><a href="errata31.html#named">November 14, 2002:
1.230 millert 786: A buffer overflow exists in named(8) that could lead to a
787: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 788: <li><a href="errata31.html#kernresource">November 6, 2002:
1.229 miod 789: Incorrect argument checking in the getitimer(2) system call
790: may allow an attacker to crash the system.</a>
1.294 david 791: <li><a href="errata31.html#smrsh">November 6, 2002:
1.229 miod 792: An attacker can bypass smrsh(8)'s restrictions and execute
793: arbitrary commands with the privileges of his own account.</a>
1.294 david 794: <li><a href="errata31.html#kadmin">October 21, 2002:
1.226 miod 795: A buffer overflow can occur in the kadmind(8) daemon, leading
796: to possible remote crash or exploit.</a>
1.294 david 797: <li><a href="errata31.html#kerntime">October 2, 2002:
1.222 jason 798: Incorrect argument checking in the setitimer(2) system call
799: may allow an attacker to write to kernel memory.</a>
1.294 david 800: <li><a href="errata31.html#scarg">August 11, 2002:
1.221 provos 801: An insufficient boundary check in the select system call
1.220 miod 802: allows an attacker to overwrite kernel memory and execute arbitrary code
803: in kernel context.</a>
1.294 david 804: <li><a href="errata31.html#ssl">July 30, 2002:
1.218 miod 805: Several remote buffer overflows can occur in the SSL2 server and SSL3
806: client of the ssl(8) library, as in the ASN.1 parser code in the
807: crypto(3) library, all of them being potentially remotely
808: exploitable.</a>
1.294 david 809: <li><a href="errata31.html#xdr">July 29, 2002:
1.218 miod 810: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
811: possible remote crash.</a>
1.294 david 812: <li><a href="errata31.html#pppd">July 29, 2002:
1.218 miod 813: A race condition exists in the pppd(8) daemon which may cause it to
814: alter the file permissions of an arbitrary file.</a>
1.294 david 815: <li><a href="errata31.html#isakmpd">July 5, 2002:
1.218 miod 816: Receiving IKE payloads out of sequence can cause isakmpd(8) to
817: crash.</a>
1.294 david 818: <li><a href="errata31.html#ktrace">June 27, 2002:
1.215 miod 819: The kernel would let any user ktrace set[ug]id processes.</a>
1.294 david 820: <li><a href="errata31.html#modssl">June 26, 2002:
1.213 miod 821: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 822: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.294 david 823: <li><a href="errata31.html#resolver">June 25, 2002:
1.212 millert 824: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 825: <li><a href="errata31.html#sshd">June 24, 2002:
1.216 deraadt 826: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 827: input validation error that can result in an integer overflow and
828: privilege escalation.</a>
1.294 david 829: <li><a href="errata31.html#httpd">June 19, 2002:
1.211 miod 830: A buffer overflow can occur during the interpretation of chunked
831: encoding in httpd(8), leading to possible remote crash.</a>
1.294 david 832: <li><a href="errata31.html#sshbsdauth">May 22, 2002:
1.209 markus 833: Under certain conditions, on systems using YP with netgroups
834: in the password database, it is possible that sshd(8) does
835: ACL checks for the requested user name but uses the password
836: database entry of a different user for authentication. This
837: means that denied users might authenticate successfully
838: while permitted users could be locked out.</a>
1.294 david 839: <li><a href="errata31.html#fdalloc2">May 8, 2002:
1.208 millert 840: A race condition exists that could defeat the kernel's
841: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 842: <li><a href="errata31.html#sudo">April 25, 2002:
1.205 millert 843: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 844: <li><a href="errata31.html#sshafs">April 22, 2002:
1.205 millert 845: A local user can gain super-user privileges due to a buffer
846: overflow in sshd(8) if AFS has been configured on the system
847: or if KerberosTgtPassing or AFSTokenPassing has been enabled
848: in the sshd_config file.</a>
1.203 deraadt 849: </ul>
850:
1.235 miod 851: <p>
1.203 deraadt 852: <li>
1.288 matthieu 853: <a name="30"></a>
1.187 deraadt 854:
1.294 david 855: <h3><font color="#e00000">OpenBSD 3.0 Security Advisories</font></h3>
1.187 deraadt 856: These are the OpenBSD 3.0 advisories -- all these problems are solved
1.294 david 857: in <a href="anoncvs.html">OpenBSD current</a>. The
858: <a href="stable.html">patch branch</a> for 3.0 is no longer being maintained,
1.258 beck 859: you should update your machine.
1.187 deraadt 860:
861: <p>
862: <ul>
1.294 david 863: <li><a href="errata30.html#named">November 14, 2002:
1.230 millert 864: A buffer overflow exists in named(8) that could lead to a
865: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 866: <li><a href="errata30.html#kernresource">November 6, 2002:
1.229 miod 867: Incorrect argument checking in the getitimer(2) system call
868: may allow an attacker to crash the system.</a>
1.294 david 869: <li><a href="errata30.html#smrsh">November 6, 2002:
1.229 miod 870: An attacker can bypass smrsh(8)'s restrictions and execute
871: arbitrary commands with the privileges of his own account.</a>
1.294 david 872: <li><a href="errata30.html#kadmin">October 21, 2002:
1.226 miod 873: A buffer overflow can occur in the kadmind(8) daemon, leading
874: to possible remote crash or exploit.</a>
1.294 david 875: <li><a href="errata30.html#kerntime">October 7, 2002:
1.223 miod 876: Incorrect argument checking in the setitimer(2) system call
877: may allow an attacker to write to kernel memory.</a>
1.294 david 878: <li><a href="errata30.html#scarg">August 11, 2002:
1.220 miod 879: An insufficient boundary check in the select and poll system calls
880: allows an attacker to overwrite kernel memory and execute arbitrary code
881: in kernel context.</a>
1.294 david 882: <li><a href="errata30.html#ssl">July 30, 2002:
1.218 miod 883: Several remote buffer overflows can occur in the SSL2 server and SSL3
884: client of the ssl(8) library, as in the ASN.1 parser code in the
885: crypto(3) library, all of them being potentially remotely
886: exploitable.</a>
1.294 david 887: <li><a href="errata30.html#xdr">July 29, 2002:
1.218 miod 888: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
889: possible remote crash.</a>
1.294 david 890: <li><a href="errata30.html#pppd">July 29, 2002:
1.218 miod 891: A race condition exists in the pppd(8) daemon which may cause it to
892: alter the file permissions of an arbitrary file.</a>
1.294 david 893: <li><a href="errata30.html#isakmpd2">July 5, 2002:
1.218 miod 894: Receiving IKE payloads out of sequence can cause isakmpd(8) to
895: crash.</a>
1.294 david 896: <li><a href="errata30.html#ktrace">June 27, 2002:
1.215 miod 897: The kernel would let any user ktrace set[ug]id processes.</a>
1.294 david 898: <li><a href="errata30.html#resolver">June 25, 2002:
1.212 millert 899: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 900: <li><a href="errata30.html#sshdauth">June 24, 2002:
1.216 deraadt 901: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 902: input validation error that can result in an integer overflow and
903: privilege escalation.</a>
1.294 david 904: <li><a href="errata30.html#modssl">June 24, 2002:
1.213 miod 905: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 906: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.294 david 907: <li><a href="errata30.html#httpd">June 19, 2002:
1.213 miod 908: A buffer overflow can occur during the interpretation of chunked
909: encoding in httpd(8), leading to possible remote crash.</a>
1.294 david 910: <li><a href="errata30.html#fdalloc2">May 8, 2002:
1.208 millert 911: A race condition exists that could defeat the kernel's
912: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 913: <li><a href="errata30.html#sudo2">April 25, 2002:
1.205 millert 914: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 915: <li><a href="errata30.html#sshafs">April 22, 2002:
1.205 millert 916: A local user can gain super-user privileges due to a buffer
917: overflow in sshd(8) if AFS has been configured on the system
918: or if KerberosTgtPassing or AFSTokenPassing has been enabled
919: in the sshd_config file.</a>
1.294 david 920: <li><a href="errata30.html#mail">April 11, 2002:
1.202 millert 921: The mail(1) was interpreting tilde escapes even when invoked
922: in non-interactive mode. As mail(1) is called as root from cron,
923: this can lead to a local root compromise.</a>
1.294 david 924: <li><a href="errata30.html#approval">March 19, 2002:
1.201 millert 925: Under certain conditions, on systems using YP with netgroups in
926: the password database, it is possible for the rexecd(8) and rshd(8)
927: daemons to execute a shell from a password database entry for a
928: different user. Similarly, atrun(8) may change to the wrong
929: home directory when running jobs.</a>
1.294 david 930: <li><a href="errata30.html#zlib">March 13, 2002:
1.200 millert 931: A potential double free() exists in the zlib library;
932: this is not exploitable on OpenBSD.
933: The kernel also contains a copy of zlib; it is not
934: currently known if the kernel zlib is exploitable.</a>
1.294 david 935: <li><a href="errata30.html#openssh">March 8, 2002:
1.198 millert 936: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 937: may allow a local user to gain super-user privileges.</a>
1.294 david 938: <li><a href="errata30.html#ptrace">January 21, 2002:
1.192 jason 939: A race condition between the ptrace(2) and execve(2) system calls
940: allows an attacker to modify the memory contents of suid/sgid
941: processes which could lead to compromise of the super-user account.</a>
1.294 david 942: <li><a href="errata30.html#sudo">January 17, 2002:
1.191 millert 943: There is a security hole in sudo(8) that can be exploited
944: when the Postfix sendmail replacement is installed that may
945: allow an attacker on the local host to gain root privileges.</a>
1.294 david 946: <li><a href="errata30.html#lpd">November 28, 2001:
1.189 millert 947: An attacker can trick a machine running the lpd daemon into
948: creating new files in the root directory from a machine with
949: remote line printer access.</a>
1.294 david 950: <li><a href="errata30.html#vi.recover">November 13, 2001:
1.188 millert 951: The vi.recover script can be abused in such a way as
952: to cause arbitrary zero-length files to be removed.</a>
1.294 david 953: <li><a href="errata30.html#pf">November 13, 2001:
1.190 mpech 954: pf(4) was incapable of dealing with certain ipv6 icmp packets,
955: resulting in a crash.</a>
1.294 david 956: <li><a href="errata30.html#sshd">November 12, 2001:
1.190 mpech 957: A security hole that may allow an attacker to partially authenticate
958: if -- and only if -- the administrator has enabled KerberosV.</a>
1.187 deraadt 959: </ul>
960:
961: <p>
962: <li>
1.288 matthieu 963: <a name="29"></a>
1.173 deraadt 964:
1.294 david 965: <h3><font color="#e00000">OpenBSD 2.9 Security Advisories</font></h3>
1.173 deraadt 966: These are the OpenBSD 2.9 advisories -- all these problems are solved
1.294 david 967: in <a href="anoncvs.html">OpenBSD current</a>. The
968: <a href="stable.html">patch branch</a>. for 2.9 is no longer being maintained,
1.258 beck 969: you should update your machine.
970:
1.173 deraadt 971:
972: <p>
973: <ul>
1.294 david 974: <li><a href="errata29.html#resolver">June 25, 2002:
1.212 millert 975: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 976: <li><a href="errata29.html#fdalloc2">May 8, 2002:
1.208 millert 977: A race condition exists that could defeat the kernel's
978: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 979: <li><a href="errata29.html#sudo2">April 25, 2002:
1.207 millert 980: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 981: <li><a href="errata29.html#sshafs">April 22, 2002:
1.206 millert 982: A local user can gain super-user privileges due to a buffer
983: overflow in sshd(8) if AFS has been configured on the system
984: or if KerberosTgtPassing or AFSTokenPassing has been enabled
985: in the sshd_config file.</a>
1.294 david 986: <li><a href="errata29.html#mail">April 11, 2002:
1.202 millert 987: The mail(1) was interpreting tilde escapes even when invoked
988: in non-interactive mode. As mail(1) is called as root from cron,
989: this can lead to a local root compromise.</a>
1.294 david 990: <li><a href="errata29.html#zlib">March 13, 2002:
1.200 millert 991: A potential double free() exists in the zlib library;
992: this is not exploitable on OpenBSD.
993: The kernel also contains a copy of zlib; it is not
994: currently known if the kernel zlib is exploitable.</a>
1.294 david 995: <li><a href="errata29.html#openssh">March 8, 2002:
1.198 millert 996: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 997: may allow a local user to gain super-user privileges.</a>
1.294 david 998: <li><a href="errata29.html#ptrace">January 21, 2002:
1.198 millert 999: A race condition between the ptrace(2) and execve(2) system calls
1000: allows an attacker to modify the memory contents of suid/sgid
1001: processes which could lead to compromise of the super-user account.</a>
1.294 david 1002: <li><a href="errata29.html#sudo">January 17, 2002:
1.191 millert 1003: There is a security hole in sudo(8) that can be exploited
1004: when the Postfix sendmail replacement is installed that may
1005: allow an attacker on the local host to gain root privileges.</a>
1.294 david 1006: <li><a href="errata29.html#lpd2">November 28, 2001:
1.189 millert 1007: An attacker can trick a machine running the lpd daemon into
1008: creating new files in the root directory from a machine with
1009: remote line printer access.</a>
1.294 david 1010: <li><a href="errata29.html#vi.recover">November 13, 2001:
1.190 mpech 1011: The vi.recover script can be abused in such a way as
1012: to cause arbitrary zero-length files to be removed.</a>
1.294 david 1013: <li><a href="errata29.html#uucp">September 11, 2001:
1.184 millert 1014: A security hole exists in uuxqt(8) that may allow an
1015: attacker to gain root privileges.</a>
1.294 david 1016: <li><a href="errata29.html#lpd">August 29, 2001:
1.183 millert 1017: A security hole exists in lpd(8) that may allow an
1018: attacker to gain root privileges if lpd is running.</a>
1.294 david 1019: <li><a href="errata29.html#sendmail2">August 21, 2001:
1.181 millert 1020: A security hole exists in sendmail(8) that may allow an
1021: attacker on the local host to gain root privileges.</a>
1.294 david 1022: <li><a href="errata29.html#nfs">July 30, 2001:
1.180 jason 1023: A kernel buffer overflow in the NFS code can be used to execute
1024: arbitrary code by users with mount privileges (only root by
1.181 millert 1025: default).</a>
1.294 david 1026: <li><a href="errata29.html#kernexec">June 15, 2001:
1.178 aaron 1027: A race condition in the kernel can lead to local root compromise.</a>
1.294 david 1028: <li><a href="errata29.html#sshcookie">June 12, 2001:
1.177 markus 1029: sshd(8) allows users to delete arbitrary files named "cookies"
1030: if X11 forwarding is enabled. X11 forwarding is disabled
1031: by default.</a>
1.294 david 1032: <li><a href="errata29.html#fts">May 30, 2001:
1.176 millert 1033: Programs using the fts routines can be tricked into changing
1034: into the wrong directory.</a>
1.294 david 1035: <li><a href="errata29.html#sendmail">May 29, 2001:
1.174 millert 1036: Sendmail signal handlers contain unsafe code,
1037: leading to numerous race conditions.</a>
1.173 deraadt 1038: </ul>
1039:
1040: <p>
1041: <li>
1.288 matthieu 1042: <a name="28"></a>
1.152 deraadt 1043:
1.294 david 1044: <h3><font color="#e00000">OpenBSD 2.8 Security Advisories</font></h3>
1.152 deraadt 1045: These are the OpenBSD 2.8 advisories -- all these problems are solved
1.294 david 1046: in <a href="anoncvs.html">OpenBSD current</a>. The
1047: <a href="stable.html">patch branch</a>. for 2.8 is no longer being maintained,
1.258 beck 1048: you should update your machine.
1049:
1.152 deraadt 1050:
1051: <p>
1052: <ul>
1.294 david 1053: <li><a href="errata28.html#uucp">September 11, 2001:
1.184 millert 1054: A security hole exists in uuxqt(8) that may allow an
1055: attacker to gain root privileges.</a>
1.294 david 1056: <li><a href="errata28.html#lpd">August 29, 2001:
1.183 millert 1057: A security hole exists in lpd(8) that may allow an
1058: attacker to gain root privileges if lpd is running.</a>
1.294 david 1059: <li><a href="errata28.html#sendmail2">August 21, 2001:
1.181 millert 1060: A security hole exists in sendmail(8) that may allow an
1061: attacker on the local host to gain root privileges.</a>
1.294 david 1062: <li><a href="errata28.html#kernexec">June 15, 2001:
1.178 aaron 1063: A race condition in the kernel can lead to local root compromise.</a>
1.294 david 1064: <li><a href="errata28.html#fts">May 30, 2001:
1.176 millert 1065: Programs using the fts routines can be tricked into changing
1066: into the wrong directory.</a>
1.294 david 1067: <li><a href="errata28.html#sendmail">May 29, 2001:
1.175 millert 1068: Sendmail signal handlers contain unsafe code,
1069: leading to numerous race conditions.</a>
1.294 david 1070: <li><a href="errata28.html#ipf_frag">Apr 23, 2001:
1.231 mickey 1071: IPF contains a serious bug with its handling of fragment caching.</a>
1.294 david 1072: <li><a href="errata28.html#glob_limit">Apr 23, 2001:
1.172 ericj 1073: ftpd(8) contains a potential DoS relating to glob(3).</a>
1.294 david 1074: <li><a href="errata28.html#glob">Apr 10, 2001:
1.170 ericj 1075: The glob(3) library call contains multiple buffer overflows.</a>
1.294 david 1076: <li><a href="errata28.html#readline">Mar 18, 2001:
1.169 millert 1077: The readline library creates history files with permissive modes based on the user's umask.</a>
1.294 david 1078: <li><a href="errata28.html#ipsec_ah">Mar 2, 2001:
1.167 ericj 1079: Insufficient checks in the IPSEC AH IPv4 option handling code can lead to a buffer overrun in the kernel.</a>
1.294 david 1080: <li><a href="errata28.html#userldt">Mar 2, 2001:
1.168 horacio 1081: The <b>USER_LDT</b> kernel option allows an attacker to gain access to privileged areas of kernel memory.</a>
1.294 david 1082: <li><a href="errata28.html#sudo">Feb 22, 2001:
1.171 millert 1083: a non-exploitable buffer overflow was fixed in sudo(8).</a>
1.294 david 1084: <li><a href="errata28.html#named">Jan 29, 2001:
1.163 jason 1085: merge named(8) with ISC BIND 4.9.8-REL, which fixes some buffer vulnerabilities.</a>
1.294 david 1086: <li><a href="errata28.html#rnd">Jan 22, 2001:
1.162 jason 1087: rnd(4) did not use all of its input when written to.</a>
1.294 david 1088: <li><a href="errata28.html#xlock">Dec 22, 2000:
1.159 ericj 1089: xlock(1)'s authentication was re-done to authenticate via a named pipe. (patch and new xlock binaries included).</a>
1.294 david 1090: <li><a href="errata28.html#procfs">Dec 18, 2000:
1.157 ericj 1091: Procfs contains numerous overflows. Procfs is not used by default in OpenBSD. (patch included).</a>
1.294 david 1092: <li><a href="errata28.html#kerberos2">Dec 10, 2000:
1.156 deraadt 1093: Another problem exists in KerberosIV libraries (patch included).</a>
1.294 david 1094: <li><a href="errata28.html#kerberos">Dec 7, 2000:
1.155 deraadt 1095: A set of problems in KerberosIV exist (patch included).</a>
1.294 david 1096: <li><a href="errata28.html#ftpd">Dec 4, 2000:
1.154 millert 1097: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.152 deraadt 1098: </ul>
1099:
1100: <p>
1101: <li>
1.288 matthieu 1102: <a name="27"></a>
1.124 deraadt 1103:
1.294 david 1104: <h3><font color="#e00000">OpenBSD 2.7 Security Advisories</font></h3>
1.124 deraadt 1105: These are the OpenBSD 2.7 advisories -- all these problems are solved
1.294 david 1106: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.124 deraadt 1107: OpenBSD 2.6 advisories listed below are fixed in OpenBSD 2.7.
1108:
1109: <p>
1110: <ul>
1.294 david 1111: <li><a href="errata27.html#readline">Mar 18, 2001:
1.169 millert 1112: The readline library creates history files with permissive modes based on the user's umask.</a>
1.294 david 1113: <li><a href="errata27.html#sudo">Feb 22, 2001:
1.169 millert 1114: a buffer overflow was fixed in sudo(8).</a>
1.294 david 1115: <li><a href="errata27.html#ftpd">Dec 4, 2000:
1.154 millert 1116: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.294 david 1117: <li><a href="errata27.html#sshforwarding">Nov 10, 2000:
1.152 deraadt 1118: Hostile servers can force OpenSSH clients to do agent or X11 forwarding.
1119: (patch included)</a>
1.294 david 1120: <li><a href="errata27.html#xtrans">Oct 26, 2000:
1.151 matthieu 1121: X11 libraries have 2 potential overflows in xtrans code.
1122: (patch included)</a>
1.294 david 1123: <li><a href="errata27.html#httpd">Oct 18, 2000:
1.150 beck 1124: Apache mod_rewrite and mod_vhost_alias modules could expose files
1125: on the server in certain configurations if used.
1126: (patch included)</a>
1.294 david 1127: <li><a href="errata27.html#telnetd">Oct 10, 2000:
1.149 millert 1128: The telnet daemon does not strip out the TERMINFO, TERMINFO_DIRS,
1129: TERMPATH and TERMCAP environment variables as it should.
1130: (patch included)</a>
1.294 david 1131: <li><a href="errata27.html#format_strings">Oct 6, 2000:
1.148 millert 1132: There are printf-style format string bugs in several privileged
1133: programs. (patch included)</a>
1.294 david 1134: <li><a href="errata27.html#curses">Oct 6, 2000:
1.147 millert 1135: libcurses honored terminal descriptions in the $HOME/.terminfo
1136: directory as well as in the TERMCAP environment variable for
1137: setuid and setgid applications.
1.146 deraadt 1138: (patch included)</a>
1.294 david 1139: <li><a href="errata27.html#talkd">Oct 6, 2000:
1.146 deraadt 1140: A format string vulnerability exists in talkd(8).
1141: (patch included)</a>
1.294 david 1142: <li><a href="errata27.html#pw_error">Oct 3, 2000:
1.145 aaron 1143: A format string vulnerability exists in the pw_error() function of the
1144: libutil library, yielding localhost root through chpass(1).
1145: (patch included)</a>
1.294 david 1146: <li><a href="errata27.html#ipsec">Sep 18, 2000:
1.144 jason 1147: Bad ESP/AH packets could cause a crash under certain conditions.
1148: (patch included)</a>
1.294 david 1149: <li><a href="errata27.html#xlock">Aug 16, 2000:
1.141 deraadt 1150: A format string vulnerability (localhost root) exists in xlock(1).
1151: (patch included)</a>
1.294 david 1152: <li><a href="errata27.html#X11_libs">July 14, 2000:
1.139 deraadt 1153: Various bugs found in X11 libraries have various side effects, almost
1154: completely denial of service in OpenBSD.
1155: (patch included)</a>
1.294 david 1156: <li><a href="errata27.html#ftpd">July 5, 2000:
1.136 deraadt 1157: Just like pretty much all the other unix ftp daemons
1158: on the planet, ftpd had a remote root hole in it.
1159: Luckily, ftpd was not enabled by default.
1.137 deraadt 1160: The problem exists if anonymous ftp is enabled.
1.136 deraadt 1161: (patch included)</a>
1.294 david 1162: <li><a href="errata27.html#mopd">July 5, 2000:
1.136 deraadt 1163: Mopd, very rarely used, contained some buffer overflows.
1164: (patch included)</a>
1.294 david 1165: <li><a href="errata27.html#libedit">June 28, 2000:
1.135 deraadt 1166: libedit would check for a <b>.editrc</b> file in the current
1167: directory. Not known to be a real security issue, but a patch
1168: is available anyways.
1169: (patch included)</a>
1.294 david 1170: <li><a href="errata27.html#dhclient">June 24, 2000:
1.134 deraadt 1171: A serious bug in dhclient(8) could allow strings from a
1172: malicious dhcp server to be executed in the shell as root.
1173: (patch included)</a>
1.294 david 1174: <li><a href="errata27.html#isakmpd">June 9, 2000:
1.133 deraadt 1175: A serious bug in isakmpd(8) policy handling wherein
1176: policy verification could be completely bypassed in isakmpd.
1177: (patch included)</a>
1.294 david 1178: <li><a href="errata27.html#uselogin">June 6, 2000:
1.132 deraadt 1179: The non-default flag UseLogin in <b>/etc/sshd_config</b> is broken,
1180: should not be used, and results in security problems on
1181: other operating systems.</a>
1.294 david 1182: <li><a href="errata27.html#bridge">May 26, 2000:
1.129 deraadt 1183: The bridge(4) <i>learning</i> flag may be bypassed.
1.128 deraadt 1184: (patch included)</a>
1.294 david 1185: <li><a href="errata27.html#ipf">May 25, 2000:
1.127 kjell 1186: Improper use of ipf <i>keep-state</i> rules can result
1187: in firewall rules being bypassed. (patch included)</a>
1188:
1.124 deraadt 1189: </ul>
1190:
1191: <p>
1192: <li>
1.288 matthieu 1193: <a name="26"></a>
1.119 deraadt 1194:
1.294 david 1195: <h3><font color="#e00000">OpenBSD 2.6 Security Advisories</font></h3>
1.119 deraadt 1196: These are the OpenBSD 2.6 advisories -- all these problems are solved
1.294 david 1197: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.119 deraadt 1198: OpenBSD 2.5 advisories listed below are fixed in OpenBSD 2.6.
1199:
1200: <p>
1201: <ul>
1.294 david 1202: <li><a href="errata26.html#semconfig">May 26, 2000:
1.130 deraadt 1203: SYSV semaphore support contained an undocumented system call
1.131 deraadt 1204: which could wedge semaphore-using processes from exiting. (patch included)</a>
1.294 david 1205: <li><a href="errata26.html#ipf">May 25, 2000:
1.127 kjell 1206: Improper use of ipf <i>keep-state</i> rules can result
1207: in firewall rules being bypassed. (patch included)</a>
1.294 david 1208: <li><a href="errata26.html#xlockmore">May 25, 2000:
1.125 deraadt 1209: xlockmore has a bug which a localhost attacker can use to gain
1210: access to the encrypted root password hash (which is normally
1.245 miod 1211: encoded using blowfish</a> (see
1.294 david 1212: <a href="http://www.openbsd.org/cgi-bin/man.cgi?query=crypt&sektion=3">
1.125 deraadt 1213: crypt(3)</a>)
1.245 miod 1214: (patch included).
1.294 david 1215: <li><a href="errata26.html#procfs">Jan 20, 2000:
1.123 deraadt 1216: Systems running with procfs enabled and mounted are
1217: vulnerable to a very tricky exploit. procfs is not
1218: mounted by default.
1219: (patch included).</a>
1.294 david 1220: <li><a href="errata26.html#sendmail">Dec 4, 1999:
1.296 david 1221: Sendmail permitted any user to cause an aliases file wrap,
1.190 mpech 1222: thus exposing the system to a race where the aliases file
1223: did not exist.
1.119 deraadt 1224: (patch included).</a>
1.294 david 1225: <li><a href="errata26.html#poll">Dec 4, 1999:
1.190 mpech 1226: Various bugs in poll(2) may cause a kernel crash.</a>
1.294 david 1227: <li><a href="errata26.html#sslUSA">Dec 2, 1999:
1.120 deraadt 1228: A buffer overflow in the RSAREF code included in the
1229: USA version of libssl, is possibly exploitable in
1230: httpd, ssh, or isakmpd, if SSL/RSA features are enabled.
1.124 deraadt 1231: (patch included).<br></a>
1232: <strong>Update:</strong> Turns out that this was not exploitable
1233: in any of the software included in OpenBSD 2.6.
1.294 david 1234: <li><a href="errata26.html#ifmedia">Nov 9, 1999:
1.190 mpech 1235: Any user could change interface media configurations, resulting in
1236: a localhost denial of service attack.
1.121 deraadt 1237: (patch included).</a>
1.119 deraadt 1238: </ul>
1239:
1240: <p>
1241: <li>
1.288 matthieu 1242: <a name="25"></a>
1.106 deraadt 1243:
1.294 david 1244: <h3><font color="#e00000">OpenBSD 2.5 Security Advisories</font></h3>
1.93 deraadt 1245: These are the OpenBSD 2.5 advisories -- all these problems are solved
1.294 david 1246: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.93 deraadt 1247: OpenBSD 2.4 advisories listed below are fixed in OpenBSD 2.5.
1248:
1.96 deraadt 1249: <p>
1.104 deraadt 1250: <ul>
1.294 david 1251: <li><a href="errata25.html#cron">Aug 30, 1999:
1.103 deraadt 1252: In cron(8), make sure argv[] is NULL terminated in the
1253: fake popen() and run sendmail as the user, not as root.
1254: (patch included).</a>
1.294 david 1255: <li><a href="errata25.html#miscfs">Aug 12, 1999: The procfs and fdescfs
1.101 deraadt 1256: filesystems had an overrun in their handling of uio_offset
1257: in their readdir() routines. (These filesystems are not
1258: enabled by default). (patch included).</a>
1.294 david 1259: <li><a href="errata25.html#profil">Aug 9, 1999: Stop profiling (see profil(2))
1.100 deraadt 1260: when we execve() a new process. (patch included).</a>
1.294 david 1261: <li><a href="errata25.html#ipsec_in_use">Aug 6, 1999: Packets that should have
1.98 deraadt 1262: been handled by IPsec may be transmitted as cleartext.
1263: PF_KEY SA expirations may leak kernel resources.
1264: (patch included).</a>
1.294 david 1265: <li><a href="errata25.html#rc">Aug 5, 1999: In /etc/rc, use mktemp(1) for
1.97 deraadt 1266: motd re-writing and change the find(1) to use -execdir
1267: (patch included).</a>
1.294 david 1268: <li><a href="errata25.html#chflags">Jul 30, 1999: Do not permit regular
1.95 deraadt 1269: users to chflags(2) or fchflags(2) on character or block devices
1270: which they may currently be the owner of (patch included).</a>
1.294 david 1271: <li><a href="errata25.html#nroff">Jul 27, 1999: Cause groff(1) to be invoked
1.95 deraadt 1272: with the -S flag, when called by nroff(1) (patch included).</a>
1.93 deraadt 1273: </ul>
1274:
1.106 deraadt 1275: <p>
1276: <li>
1.288 matthieu 1277: <a name="24"></a>
1.235 miod 1278:
1.294 david 1279: <h3><font color="#e00000">OpenBSD 2.4 Security Advisories</font></h3>
1.75 deraadt 1280: These are the OpenBSD 2.4 advisories -- all these problems are solved
1.294 david 1281: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.75 deraadt 1282: OpenBSD 2.3 advisories listed below are fixed in OpenBSD 2.4.
1283:
1.96 deraadt 1284: <p>
1.75 deraadt 1285: <ul>
1.294 david 1286: <li><a href="errata24.html#poll">Mar 22, 1999: The nfds argument for poll(2) needs
1.91 deraadt 1287: to be constrained, to avoid kvm starvation (patch included).</a>
1.294 david 1288: <li><a href="errata24.html#tss">Mar 21, 1999: A change in TSS handling stops
1.91 deraadt 1289: another kernel crash case caused by the <strong>crashme</strong>
1290: program (patch included).</a>
1.294 david 1291: <li><a href="errata24.html#nlink">Feb 25, 1999: An unbounded increment on the
1.90 deraadt 1292: nlink value in FFS and EXT2FS filesystems can cause a system crash.
1.89 deraadt 1293: (patch included).</a>
1.294 david 1294: <li><a href="errata24.html#ping">Feb 23, 1999: Yet another buffer overflow
1.88 deraadt 1295: existed in ping(8). (patch included).</a>
1.294 david 1296: <li><a href="errata24.html#ipqrace">Feb 19, 1999: ipintr() had a race in use of
1.87 deraadt 1297: the ipq, which could permit an attacker to cause a crash.
1298: (patch included).</a>
1.294 david 1299: <li><a href="errata24.html#accept">Feb 17, 1999: A race condition in the
1.86 deraadt 1300: kernel between accept(2) and select(2) could permit an attacker
1301: to hang sockets from remote.
1302: (patch included).</a>
1.294 david 1303: <li><a href="errata24.html#maxqueue">Feb 17, 1999: IP fragment assembly can
1.85 deraadt 1304: bog the machine excessively and cause problems.
1305: (patch included).</a>
1.294 david 1306: <li><a href="errata24.html#trctrap">Feb 12, 1999: i386 T_TRCTRAP handling and
1.84 deraadt 1307: DDB interacted to possibly cause a crash.
1308: (patch included).</a>
1.294 david 1309: <li><a href="errata24.html#rst">Feb 11, 1999: TCP/IP RST handling was sloppy.
1.83 deraadt 1310: (patch included).</a>
1.294 david 1311: <li><a href="errata24.html#bootpd">Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 1312: problem in bootpd(8). (patch included).</a>
1.294 david 1313: <li><a href="errata24.html#termcap">Nov 19, 1998: There is a possibly locally
1.82 deraadt 1314: exploitable problem relating to environment variables in termcap
1315: and curses. (patch included).</a>
1.294 david 1316: <li><a href="errata24.html#tcpfix">Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 1317: bug in the TCP decoding kernel. (patch included).</a>
1.75 deraadt 1318: </ul>
1319:
1.106 deraadt 1320: <p>
1321: <li>
1.288 matthieu 1322: <a name="23"></a>
1.235 miod 1323:
1.294 david 1324: <h3><font color="#e00000">OpenBSD 2.3 Security Advisories</font></h3>
1.73 deraadt 1325: These are the OpenBSD 2.3 advisories -- all these problems are solved
1.294 david 1326: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.73 deraadt 1327: OpenBSD 2.2 advisories listed below are fixed in OpenBSD 2.3.
1.53 matthieu 1328:
1.96 deraadt 1329: <p>
1.53 matthieu 1330: <ul>
1.294 david 1331: <li><a href="errata23.html#bootpd">Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 1332: problem in bootpd(8). (patch included).</a>
1.294 david 1333: <li><a href="errata23.html#tcpfix">Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 1334: bug in the TCP decoding kernel. (patch included).</a>
1.294 david 1335: <li><a href="errata23.html#resolver">August 31, 1998: A benign looking resolver
1.190 mpech 1336: buffer overflow bug was re-introduced accidentally (patches included).</a>
1.294 david 1337: <li><a href="errata23.html#chpass">Aug 2, 1998:
1.190 mpech 1338: chpass(1) has a file descriptor leak which allows an
1339: attacker to modify /etc/master.passwd.</a>
1.294 david 1340: <li><a href="errata23.html#inetd">July 15, 1998: Inetd had a file descriptor leak.</a>
1341: <li><a href="errata23.html#fdalloc">Jul 2, 1998: setuid and setgid processes
1.72 deraadt 1342: should not be executed with fd slots 0, 1, or 2 free.
1343: (patch included).</a>
1.294 david 1344: <li><a href="errata23.html#xlib">June 6, 1998: Further problems with the X
1.71 deraadt 1345: libraries (patches included).</a>
1.294 david 1346: <li><a href="errata23.html#kill">May 17, 1998: kill(2) of setuid/setgid target
1.66 deraadt 1347: processes too permissive (4th revision patch included).</a>
1.294 david 1348: <li><a href="errata23.html#immutable">May 11, 1998: mmap() permits partial bypassing
1.60 deraadt 1349: of immutable and append-only file flags. (patch included).</a>
1.294 david 1350: <li><a href="errata23.html#ipsec">May 5, 1998: Incorrect handling of IPSEC packets
1.190 mpech 1351: if IPSEC is enabled (patch included).</a>
1.294 david 1352: <li><a href="errata23.html#xterm-xaw">May 1, 1998: Buffer overflow in xterm and Xaw
1.58 deraadt 1353: (CERT advisory VB-98.04) (patch included).</a>
1.53 matthieu 1354: </ul>
1.9 deraadt 1355:
1.106 deraadt 1356: <p>
1357: <li>
1.288 matthieu 1358: <a name="22"></a>
1.235 miod 1359:
1.294 david 1360: <h3><font color="#e00000">OpenBSD 2.2 Security Advisories</font></h3>
1.45 deraadt 1361: These are the OpenBSD 2.2 advisories. All these problems are solved
1.294 david 1362: in <a href="23.html">OpenBSD 2.3</a>. Some of these problems
1.45 deraadt 1363: still exist in other operating systems. (The supplied patches are for
1364: OpenBSD 2.2; they may or may not work on OpenBSD 2.1).
1.9 deraadt 1365:
1.96 deraadt 1366: <p>
1.9 deraadt 1367: <ul>
1.294 david 1368: <li><a href="errata22.html#ipsec">May 5, 1998: Incorrect handling of IPSEC
1.72 deraadt 1369: packets if IPSEC is enabled (patch included).</a>
1.294 david 1370: <li><a href="errata22.html#xterm-xaw">May 1, 1998: Buffer overflow in xterm
1.72 deraadt 1371: and Xaw (CERT advisory VB-98.04) (patch included).</a>
1.294 david 1372: <li><a href="errata22.html#uucpd">Apr 22, 1998: Buffer overflow in uucpd
1.72 deraadt 1373: (patch included).</a>
1.294 david 1374: <li><a href="errata22.html#rmjob">Apr 22, 1998: Buffer mismanagement in lprm
1.72 deraadt 1375: (patch included).</a>
1.294 david 1376: <li><a href="errata22.html#ping">Mar 31, 1998: Overflow in ping -R (patch included).</a>
1377: <li><a href="errata22.html#named">Mar 30, 1998: Overflow in named fake-iquery
1.59 deraadt 1378: (patch included).</a>
1.294 david 1379: <li><a href="errata22.html#mountd">Mar 2, 1998: Accidental NFS filesystem
1.72 deraadt 1380: export (patch included).</a>
1.112 philen 1381: <li><a href="advisories/mmap.txt">Feb 26, 1998: Read-write mmap() flaw.</a>
1.294 david 1382: Revision 3 of the patch is available <a href="errata22.html#mmap">here</a>
1.112 philen 1383: <li><a href="advisories/sourceroute.txt">Feb 19, 1998: Sourcerouted Packet
1.59 deraadt 1384: Acceptance.</a>
1.294 david 1385: A patch is available <a href="errata22.html#sourceroute">here</a>.
1386: <li><a href="errata22.html#ruserok">Feb 13, 1998: Setuid coredump & Ruserok()
1.72 deraadt 1387: flaw (patch included).</a>
1.294 david 1388: <li><a href="errata22.html#ldso">Feb 9, 1998: MIPS ld.so flaw (patch included).</a>
1.1 deraadt 1389: </ul>
1390:
1.106 deraadt 1391: <p>
1392: <li>
1.288 matthieu 1393: <a name="21"></a>
1.235 miod 1394:
1.294 david 1395: <h3><font color="#e00000">OpenBSD 2.1 Security Advisories</font></h3>
1.52 deraadt 1396: These are the OpenBSD 2.1 advisories. All these problems are solved
1.294 david 1397: in <a href="22.html">OpenBSD 2.2</a>. Some of these problems still
1.52 deraadt 1398: exist in other operating systems. (If you are running OpenBSD 2.1, we
1399: would strongly recommend an upgrade to the newest release, as this
1400: patch list only attempts at fixing the most important security
1401: problems. In particular, OpenBSD 2.2 fixes numerous localhost
1402: security problems. Many of those problems were solved in ways which
1403: make it hard for us to provide patches).
1404:
1.96 deraadt 1405: <p>
1.52 deraadt 1406: <ul>
1.112 philen 1407: <li><a href="advisories/signals.txt">Sep 15, 1997: Deviant Signals (patch included)</a>
1408: <li><a href="advisories/rfork.txt">Aug 2, 1997: Rfork() system call flaw
1.59 deraadt 1409: (patch included)</a>
1.112 philen 1410: <li><a href="advisories/procfs.txt">Jun 24, 1997: Procfs flaws (patch included)</a>
1.52 deraadt 1411: </ul>
1.51 deraadt 1412:
1.106 deraadt 1413: <p>
1414: <li>
1.288 matthieu 1415: <a name="20"></a>
1.235 miod 1416:
1.294 david 1417: <h3><font color="#e00000">OpenBSD 2.0 Security Advisories</font></h3>
1.99 deraadt 1418: These are the OpenBSD 2.0 advisories. All these problems are solved
1.294 david 1419: in <a href="21.html">OpenBSD 2.1</a>. Some of these problems still
1.99 deraadt 1420: exist in other operating systems. (If you are running OpenBSD 2.0, we
1421: commend you for being there back in the old days!, but you're really
1422: missing out if you don't install a new version!)
1423:
1424: <p>
1425: <ul>
1.112 philen 1426: <li><a href="advisories/res_random.txt">April 22, 1997: Predictable IDs in the
1.99 deraadt 1427: resolver (patch included)</a>
1428: <li>Many others... if people can hunt them down, please let me know
1429: and we'll put them up here.
1430: </ul>
1.51 deraadt 1431: <p>
1.106 deraadt 1432:
1.288 matthieu 1433: <a name="watching"></a>
1.294 david 1434: <li><h3><font color="#e00000">Watching our Changes</font></h3><p>
1.106 deraadt 1435:
1.21 deraadt 1436: Since we take a proactive stance with security, we are continually
1437: finding and fixing new security problems. Not all of these problems
1.80 espie 1438: get widely reported because (as stated earlier) many of them are not
1.45 deraadt 1439: confirmed to be exploitable; many simple bugs we fix do turn out to
1440: have security consequences we could not predict. We do not have the
1441: time resources to make these changes available in the above format.<p>
1.21 deraadt 1442:
1443: Thus there are usually minor security fixes in the current source code
1444: beyond the previous major OpenBSD release. We make a limited
1.45 deraadt 1445: guarantee that these problems are of minimal impact and unproven
1.44 ian 1446: exploitability. If we discover that a problem definitely matters for
1.45 deraadt 1447: security, patches will show up here <strong>VERY</strong> quickly.<p>
1.21 deraadt 1448:
1.45 deraadt 1449: People who are really concerned with security can do a number of
1450: things:<p>
1.21 deraadt 1451:
1452: <ul>
1453: <li>If you understand security issues, watch our
1.294 david 1454: <a href="mail.html">source-changes mailing list</a> and keep an
1.23 deraadt 1455: eye out for things which appear security related. Since
1.21 deraadt 1456: exploitability is not proven for many of the fixes we make,
1457: do not expect the relevant commit message to say "SECURITY FIX!".
1458: If a problem is proven and serious, a patch will be available
1459: here very shortly after.
1.161 horacio 1460: <li>In addition to source changes, you can watch our <a href="mail.html">
1.160 ericj 1461: security-announce mailing list</a> which will notify you for every
1.186 ian 1462: security related item that the OpenBSD team deems as a possible threat,
1.160 ericj 1463: and instruct you on how to patch the problem.
1.21 deraadt 1464: <li>Track our current source code tree, and teach yourself how to do a
1.29 deraadt 1465: complete system build from time to time (read /usr/src/Makefile
1466: carefully). Users can make the assumption that the current
1467: source tree always has stronger security than the previous release.
1.45 deraadt 1468: However, building your own system from source code is not trivial;
1.265 miod 1469: it is nearly 600MB of source code, and problems do occur as we
1.45 deraadt 1470: transition between major releases.
1.115 ericj 1471: <li>Install a binary snapshot for your
1.80 espie 1472: architecture, which are made available fairly often. For
1.29 deraadt 1473: instance, an i386 snapshot is typically made available weekly.
1.21 deraadt 1474: </ul>
1475:
1.9 deraadt 1476: <p>
1.288 matthieu 1477: <a name="reporting"></a>
1.294 david 1478: <li><h3><font color="#e00000">Reporting problems</font></h3><p>
1.3 deraadt 1479:
1.5 deraadt 1480: <p> If you find a new security problem, you can mail it to
1.294 david 1481: <a href="mailto:deraadt@openbsd.org">deraadt@openbsd.org</a>.
1.7 deraadt 1482: <br>
1.5 deraadt 1483: If you wish to PGP encode it (but please only do so if privacy is very
1.112 philen 1484: urgent, since it is inconvenient) use this <a href="advisories/pgpkey.txt">pgp key</a>.
1.5 deraadt 1485:
1.107 deraadt 1486: <p>
1.288 matthieu 1487: <a name="papers"></a>
1.294 david 1488: <li><h3><font color="#e00000">Further Reading</font></h3><p>
1.107 deraadt 1489:
1490: A number of papers have been written by OpenBSD team members, about security
1491: related changes they have done in OpenBSD. The postscript versions of these
1.108 deraadt 1492: documents are available as follows.<p>
1.107 deraadt 1493:
1494: <ul>
1.113 deraadt 1495: <li>A Future-Adaptable Password Scheme.<br>
1.294 david 1496: <a href="events.html#usenix99">Usenix 1999</a>,
1497: by <a href="mailto:provos@openbsd.org">Niels Provos</a>,
1498: <a href="mailto:dm@openbsd.org">David Mazieres</a>.<br>
1499: <a href="papers/bcrypt-paper.ps">paper</a> and
1500: <a href="papers/bcrypt-slides.ps">slides</a>.
1.113 deraadt 1501: <p>
1502: <li>Cryptography in OpenBSD: An Overview.<br>
1.294 david 1503: <a href="events.html#usenix99">Usenix 1999</a>,
1504: by <a href="mailto:deraadt@openbsd.org">Theo de Raadt</a>,
1505: <a href="mailto:niklas@openbsd.org">Niklas Hallqvist</a>,
1506: <a href="mailto:art@openbsd.org">Artur Grabowski</a>,
1507: <a href="mailto:angelos@openbsd.org">Angelos D. Keromytis</a>,
1508: <a href="mailto:provos@openbsd.org">Niels Provos</a>.<br>
1509: <a href="papers/crypt-paper.ps">paper</a> and
1510: <a href="papers/crypt-slides.ps">slides</a>.
1.113 deraadt 1511: <p>
1512: <li>strlcpy and strlcat -- consistent, safe, string copy and concatenation.<br>
1.294 david 1513: <a href="events.html#usenix99">Usenix 1999</a>,
1514: by <a href="mailto:millert@openbsd.org">Todd C. Miller</a>,
1515: <a href="mailto:deraadt@openbsd.org">Theo de Raadt</a>.<br>
1516: <a href="papers/strlcpy-paper.ps">paper</a> and
1517: <a href="papers/strlcpy-slides.ps">slides</a>.
1.113 deraadt 1518: <p>
1.118 deraadt 1519: <li>Dealing with Public Ethernet Jacks-Switches, Gateways, and Authentication.<br>
1.294 david 1520: <a href="events.html#lisa99">LISA 1999</a>,
1521: by <a href="mailto:beck@openbsd.org">Bob Beck</a>.<br>
1522: <a href="papers/authgw-paper.ps">paper</a> and
1523: <a href="papers/authgw-slides.ps">slides</a>.
1.118 deraadt 1524: <p>
1.153 jufi 1525: <li>Encrypting Virtual Memory<br>
1.294 david 1526: <a href="events.html#sec2000">Usenix Security 2000</a>,
1527: <a href="mailto:provos@openbsd.org">Niels Provos</a>.<br>
1528: <a href="papers/swapencrypt.ps">paper</a> and
1529: <a href="papers/swapencrypt-slides.ps">slides</a>.
1.142 deraadt 1530: <p>
1.107 deraadt 1531: </ul>
1.294 david 1532: </ul>
1.106 deraadt 1533:
1.2 deraadt 1534: <hr>
1.294 david 1535: <a href="index.html"><img height=24 width=24 src="back.gif" border=0 alt="OpenBSD"></a>
1536: <a href="mailto:www@openbsd.org">www@openbsd.org</a>
1.24 deraadt 1537: <br>
1.336 ! brad 1538: <small>$OpenBSD: security.html,v 1.335 2006/11/04 21:28:18 deraadt Exp $</small>
1.1 deraadt 1539:
1.24 deraadt 1540: </body>
1541: </html>