Annotation of www/security.html, Revision 1.312
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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>,
! 59: <a href="#37">3.7</a>.
1.114 philen 60: </td>
61: </tr>
62: </table>
1.56 deraadt 63: <hr>
64:
1.294 david 65: <a name="goals"></a>
1.278 deraadt 66: <ul>
1.294 david 67: <li><h3><font color="#e00000">Goal</font></h3><p>
1.22 deraadt 68:
1.14 deraadt 69: OpenBSD believes in strong security. Our aspiration is to be NUMBER
1.22 deraadt 70: ONE in the industry for security (if we are not already there). Our
71: open software development model permits us to take a more
72: uncompromising view towards increased security than Sun, SGI, IBM, HP,
73: or other vendors are able to. We can make changes the vendors would
1.27 deraadt 74: not make. Also, since OpenBSD is exported with <a href=crypto.html>
1.45 deraadt 75: cryptography</a>, we are able to take cryptographic approaches towards
76: fixing security problems.<p>
1.18 deraadt 77:
1.288 matthieu 78: <a name="disclosure"></a>
1.294 david 79: <li><h3><font color="#e00000">Full Disclosure</font></h3><p>
1.106 deraadt 80:
1.45 deraadt 81: Like many readers of the
1.196 jufi 82: <a href="http://online.securityfocus.com/archive/1">
1.18 deraadt 83: BUGTRAQ mailing list</a>,
1.106 deraadt 84: we believe in full disclosure of security problems. In the
85: operating system arena, we were probably the first to embrace
86: the concept. Many vendors, even of free software, still try
87: to hide issues from their users.<p>
88:
89: Security information moves very fast in cracker circles. On the other
90: hand, our experience is that coding and releasing of proper security
91: fixes typically requires about an hour of work -- very fast fix
92: turnaround is possible. Thus we think that full disclosure helps the
93: people who really care about security.<p>
94:
1.288 matthieu 95: <a name="process"></a>
1.294 david 96: <li><h3><font color="#e00000">Audit Process</font></h3><p>
1.15 deraadt 97:
1.12 deraadt 98: Our security auditing team typically has between six and twelve
1.45 deraadt 99: members who continue to search for and fix new security holes. We
100: have been auditing since the summer of 1996. The process we follow to
101: increase security is simply a comprehensive file-by-file analysis of
1.106 deraadt 102: every critical software component. We are not so much looking for
103: security holes, as we are looking for basic software bugs, and if
1.138 deraadt 104: years later someone discovers the problem used to be a security
1.106 deraadt 105: issue, and we fixed it because it was just a bug, well, all the
106: better. Flaws have been found in just about every area of the system.
107: Entire new classes of security problems have been found during our
108: audit, and often source code which had been audited earlier needs
109: re-auditing with these new flaws in mind. Code often gets audited
110: multiple times, and by multiple people with different auditing
111: skills.<p>
1.12 deraadt 112:
1.94 deraadt 113: Some members of our security auditing team worked for Secure Networks,
114: the company that made the industry's premier network security scanning
115: software package Ballista (Secure Networks got purchased by Network
116: Associates, Ballista got renamed to Cybercop Scanner, and well...)
117: That company did a lot of security research, and thus fit in well
1.106 deraadt 118: with the OpenBSD stance. OpenBSD passed Ballista's tests with flying
119: colours since day 1.<p>
1.31 deraadt 120:
1.34 deraadt 121: Another facet of our security auditing process is its proactiveness.
1.45 deraadt 122: In most cases we have found that the determination of exploitability
123: is not an issue. During our ongoing auditing process we find many
124: bugs, and endeavor to fix them even though exploitability is not
125: proven. We fix the bug, and we move on to find other bugs to fix. We
126: have fixed many simple and obvious careless programming errors in code
127: and only months later discovered that the problems were in fact
128: exploitable. (Or, more likely someone on
1.197 jufi 129: <a href="http://online.securityfocus.com/archive/1">BUGTRAQ</a>
1.45 deraadt 130: would report that other operating systems were vulnerable to a `newly
131: discovered problem', and then it would be discovered that OpenBSD had
132: been fixed in a previous release). In other cases we have been saved
133: from full exploitability of complex step-by-step attacks because we
134: had fixed one of the intermediate steps. An example of where we
1.94 deraadt 135: managed such a success is the lpd advisory that Secure Networks put out.
136: <p>
1.29 deraadt 137:
1.288 matthieu 138: <a name="newtech"></a>
1.294 david 139: <li><h3><font color="#e00000">New Technologies</font></h3><p>
1.278 deraadt 140:
141: As we audit source code, we often invent new ways of solving problems.
142: Sometimes these ideas have been used before in some random application
143: written somewhere, but perhaps not taken to the degree that we do.
144: <p>
145:
146: <ul>
147: <li>strlcpy() and strlcat()
148: <li>Memory protection purify
149: <ul>
150: <li>W^X
151: <li>.rodata segment
152: <li>Guard pages
153: <li>Randomized malloc()
154: <li>Randomized mmap()
155: <li>atexit() and stdio protection
156: </ul>
1.295 otto 157: <li>Privilege separation
1.278 deraadt 158: <li>Privilege revocation
159: <li>Chroot jailing
160: <li>New uids
161: <li>ProPolice
162: <li>... and others
163: </ul>
164: <p>
165:
1.294 david 166: <li><h3><font color="#e00000">The Reward</font></h3><p>
1.106 deraadt 167:
1.45 deraadt 168: Our proactive auditing process has really paid off. Statements like
1.35 deraadt 169: ``This problem was fixed in OpenBSD about 6 months ago'' have become
1.45 deraadt 170: commonplace in security forums like
1.197 jufi 171: <a href="http://online.securityfocus.com/archive/1">BUGTRAQ</a>.<p>
1.35 deraadt 172:
1.45 deraadt 173: The most intense part of our security auditing happened immediately
1.80 espie 174: before the OpenBSD 2.0 release and during the 2.0->2.1 transition,
1.45 deraadt 175: over the last third of 1996 and first half of 1997. Thousands (yes,
176: thousands) of security issues were fixed rapidly over this year-long
177: period; bugs like the standard buffer overflows, protocol
178: implementation weaknesses, information gathering, and filesystem
179: races. Hence most of the security problems that we encountered were
180: fixed before our 2.1 release, and then a far smaller number needed
181: fixing for our 2.2 release. We do not find as many problems anymore,
182: it is simply a case of diminishing returns. Recently the security
183: problems we find and fix tend to be significantly more obscure or
184: complicated. Still we will persist for a number of reasons:<p>
1.36 deraadt 185:
1.35 deraadt 186: <ul>
1.45 deraadt 187: <li>Occasionally we find a simple problem we missed earlier. Doh!
1.35 deraadt 188: <li>Security is like an arms race; the best attackers will continue
1.45 deraadt 189: to search for more complicated exploits, so we will too.
190: <li>Finding and fixing subtle flaws in complicated software is
191: a lot of fun.
1.35 deraadt 192: </ul>
1.106 deraadt 193: <p>
1.15 deraadt 194:
1.14 deraadt 195: The auditing process is not over yet, and as you can see we continue
1.28 deraadt 196: to find and fix new security flaws.<p>
1.12 deraadt 197:
1.288 matthieu 198: <a name="default"></a>
1.294 david 199: <li><h3><font color="#e00000">"Secure by Default"</font></h3><p>
1.106 deraadt 200:
201: To ensure that novice users of OpenBSD do not need to become security
202: experts overnight (a viewpoint which other vendors seem to have), we
203: ship the operating system in a Secure by Default mode. All non-essential
204: services are disabled. As the user/administrator becomes more familiar
205: with the system, he will discover that he has to enable daemons and other
206: parts of the system. During the process of learning how to enable a new
207: service, the novice is more likely to learn of security considerations.<p>
208:
209: This is in stark contrast to the increasing number of systems that
210: ship with NFS, mountd, web servers, and various other services enabled
211: by default, creating instantaneous security problems for their users
212: within minutes after their first install.<p>
213:
1.288 matthieu 214: <a name="crypto"></a>
1.294 david 215: <li><h3><font color="#e00000">Cryptography</font></h3><p>
1.106 deraadt 216:
217: And of course, since the OpenBSD project is based in Canada, it is possible
218: for us to integrate cryptography. For more information, read the page
1.116 deraadt 219: outlining <a href=crypto.html>what we have done with cryptography</a>.</p>
1.106 deraadt 220:
1.294 david 221: <li><h3><font color="#e00000">Advisories</font></h3><p>
1.106 deraadt 222:
223: <li>
1.312 ! david 224: <a name="37"></a>
! 225:
! 226: <h3><font color="#e00000">OpenBSD 3.7 Security Advisories</font></h3>
! 227: These are the OpenBSD 3.7 advisories -- all these problems are solved
! 228: in <a href=anoncvs.html>OpenBSD current</a> and the
! 229: <a href=stable.html>patch branch</a>.
! 230:
! 231: <p>
! 232: <ul>
! 233: <li>There are no security advisories for OpenBSD 3.7 at this time.
! 234: </ul>
! 235:
! 236: <li>
1.301 miod 237: <a name="36"></a>
238:
239: <h3><font color="#e00000">OpenBSD 3.6 Security Advisories</font></h3>
240: These are the OpenBSD 3.6 advisories -- all these problems are solved
241: in <a href=anoncvs.html>OpenBSD current</a> and the
242: <a href=stable.html>patch branch</a>.
243:
244: <p>
1.302 markus 245: <ul>
1.311 deraadt 246: <li><a href="errata36.html#cvs">Apr 28, 2005:
1.310 brad 247: Fix a buffer overflow, memory leaks, and NULL pointer
248: dereference in cvs(1).</a>
1.311 deraadt 249: <li><a href="errata36.html#telnet">Mar 30, 2005:
1.309 brad 250: Due to buffer overflows in telnet(1), a malicious
251: server or man-in-the-middle attack could allow
252: execution of arbitrary code with the privileges of
253: the user invoking telnet(1).</a>
1.311 deraadt 254: <li><a href="errata36.html#copy">Mar 16, 2005:
1.307 brad 255: More stringent checking should be done in the copy(9)
256: functions to prevent their misuse.</a>
1.311 deraadt 257: <li><a href="errata36.html#locore">Feb 28, 2005:
1.306 brad 258: More stringent checking should be done in the copy(9)
259: functions to prevent their misuse.</a>
1.311 deraadt 260: <li><a href="errata36.html#httpd">Jan 12, 2005:
1.304 brad 261: httpd(8)'s mod_include module fails to properly validate
262: the length of user supplied tag strings prior to copying
1.305 brad 263: them to a local buffer, causing a buffer overflow.</a>
1.311 deraadt 264: <li><a href="errata36.html#pfkey">Dec 14, 2004:
1.302 markus 265: On systems running isakmpd(8) it is possible for a local
266: user to cause kernel memory corruption and system panic by
1.303 markus 267: setting ipsec(4) credentials on a socket.</a>
1.302 markus 268: </ul>
1.301 miod 269:
270: <p>
271: <li>
1.288 matthieu 272: <a name="35"></a>
1.279 deraadt 273:
1.294 david 274: <h3><font color="#e00000">OpenBSD 3.5 Security Advisories</font></h3>
1.279 deraadt 275: These are the OpenBSD 3.5 advisories -- all these problems are solved
276: in <a href=anoncvs.html>OpenBSD current</a> and the
277: <a href=stable.html>patch branch</a>.
278:
279: <p>
280: <ul>
1.310 brad 281: <li><a href="errata35.html#cvs4">Apr 28, 2005:
282: Fix a buffer overflow, memory leaks, and NULL pointer
283: dereference in cvs(1).</a>
1.309 brad 284: <li><a href="errata35.html#telnet">Mar 30, 2005:
285: Due to buffer overflows in telnet(1), a malicious
286: server or man-in-the-middle attack could allow
287: execution of arbitrary code with the privileges of
288: the user invoking telnet(1).</a>
1.308 brad 289: <li><a href="errata35.html#copy">Mar 16, 2005:
1.307 brad 290: More stringent checking should be done in the copy(9)
291: functions to prevent their misuse.</a>
1.306 brad 292: <li><a href="errata35.html#locore">Feb 28, 2005:
293: More stringent checking should be done in the copy(9)
294: functions to prevent their misuse.</a>
1.304 brad 295: <li><a href="errata35.html#httpd3">Jan 12, 2005:
296: httpd(8)'s mod_include module fails to properly validate
297: the length of user supplied tag strings prior to copying
1.305 brad 298: them to a local buffer, causing a buffer overflow.</a>
1.302 markus 299: <li><a href="errata35.html#pfkey">Dec 14, 2004:
300: On systems running isakmpd(8) it is possible for a local
301: user to cause kernel memory corruption and system panic by
1.303 markus 302: setting ipsec(4) credentials on a socket.</a>
1.301 miod 303: <li><a href="errata35.html#radius">Sep 20, 2004:
1.299 millert 304: Radius-based authentication is vulnerable to spoofed replies.</a>
1.301 miod 305: <li><a href="errata35.html#xpm">Sep 16, 2004:
1.298 brad 306: The Xpm library has vulnerabilities when parsing malicious images.</a>
1.301 miod 307: <li><a href="errata35.html#httpd2"> Sep 10, 2004:
1.297 brad 308: httpd(8)'s mod_rewrite module can be made to write one zero byte in
309: an arbitrary memory position outside of a char array, causing a DoS
310: or possibly buffer overflows.</a>
1.301 miod 311: <li><a href="errata35.html#httpd"> Jun 12, 2004:
1.300 deraadt 312: Multiple vulnerabilities have been found in httpd(8) / mod_ssl.</a>
1.301 miod 313: <li><a href="errata35.html#isakmpd"> Jun 10, 2004:
1.291 hshoexer 314: isakmpd(8) still has issues with unauthorized SA deletion,
1.293 brad 315: an attacker can delete IPsec tunnels at will.</a>
1.301 miod 316: <li><a href="errata35.html#cvs3"> Jun 9, 2004:
1.290 millert 317: Multiple remote vulnerabilities have been found in the cvs(1)
318: server which can be used by CVS clients to crash or execute
1.293 brad 319: arbitrary code on the server.</a>
1.301 miod 320: <li><a href="errata35.html#kerberos"> May 30, 2004:
1.289 beck 321: kdc(8) performs inadequate checking of request fields, leading
322: to the possibility of principal impersonation from other
323: Kerberos realms if they are trusted with a cross-realm trust.</a>
1.301 miod 324: <li><a href="errata35.html#xdm"> May 26, 2004:
1.287 matthieu 325: xdm(1) ignores the requestPort resource and creates a
1.293 brad 326: listening socket regardless of the setting in xdm-config.</a>
1.301 miod 327: <li><a href="errata35.html#cvs2"> May 20, 2004:
1.286 otto 328: A buffer overflow in the cvs(1) server has been found,
329: which can be used by CVS clients to execute arbitrary code on
1.293 brad 330: the server.</a>
1.301 miod 331: <li><a href="errata35.html#procfs"> May 13, 2004:
1.282 tedu 332: Integer overflow problems were found in procfs, allowing
1.293 brad 333: reading of arbitrary kernel memory.</a>
1.301 miod 334: <li><a href="errata35.html#cvs"> May 5, 2004:
1.281 otto 335: Pathname validation problems have been found in cvs(1),
336: allowing clients and servers access to files outside the
1.293 brad 337: repository or local CVS tree.</a>
1.279 deraadt 338: </ul>
339:
340: <p>
1.301 miod 341: OpenBSD 3.4 and earlier releases are not supported anymore. The following
342: paragraphs only list advisories issued while they were maintained; these
343: releases are likely to be affected by the advisories for more recent releases.
344: <br>
345:
1.279 deraadt 346: <li>
1.288 matthieu 347: <a name="34"></a>
1.261 david 348:
1.294 david 349: <h3><font color="#e00000">OpenBSD 3.4 Security Advisories</font></h3>
1.261 david 350: These are the OpenBSD 3.4 advisories -- all these problems are solved
1.301 miod 351: in <a href="anoncvs.html">OpenBSD current</a>. The
352: <a href="stable.html">patch branch</a> for 3.4 is no longer being maintained,
353: you should update your machine.
1.261 david 354: <p>
355: <ul>
1.302 markus 356: <li><a href="errata34.html#pfkey">Dec 14, 2004:
357: On systems running isakmpd(8) it is possible for a local
358: user to cause kernel memory corruption and system panic by
1.303 markus 359: setting ipsec(4) credentials on a socket.</a>
1.298 brad 360: <li><a href="errata34.html#xpm">Sep 16, 2004:
361: The Xpm library has vulnerabilities when parsing malicious images.</a>
1.297 brad 362: <li><a href="errata34.html#httpd4"> Sep 10, 2004:
363: httpd(8)'s mod_rewrite module can be made to write one zero byte in
364: an arbitrary memory position outside of a char array, causing a DoS
365: or possibly buffer overflows.</a>
1.294 david 366: <li><a href="errata34.html#httpd3"> Jun 12, 2004:
1.300 deraadt 367: Multiple vulnerabilities have been found in httpd(8) / mod_ssl.</a>
1.294 david 368: <li><a href="errata34.html#isakmpd3"> Jun 10, 2004:
1.292 brad 369: isakmpd(8) still has issues with unauthorized SA deletion,
1.293 brad 370: an attacker can delete IPsec tunnels at will.</a>
1.294 david 371: <li><a href="errata34.html#cvs3"> Jun 9, 2004:
1.290 millert 372: Multiple remote vulnerabilities have been found in the cvs(1)
373: server which can be used by CVS clients to crash or execute
1.293 brad 374: arbitrary code on the server.</a>
1.294 david 375: <li><a href="errata34.html#kerberos"> May 30, 2004:
1.289 beck 376: kdc(8) performs inadequate checking of request fields, leading
377: to the possibility of principal impersonation from other
378: Kerberos realms if they are trusted with a cross-realm trust.</a>
1.294 david 379: <li><a href="errata34.html#cvs2"> May 20, 2004:
1.286 otto 380: A buffer overflow in the cvs(1) server has been found,
381: which can be used by CVS clients to execute arbitrary code on
382: the server.</a>
1.294 david 383: <li><a href="errata34.html#procfs"> May 13, 2004:
1.282 tedu 384: Integer overflow problems were found in procfs, allowing
385: reading of arbitrary kernel memory.</a>
1.294 david 386: <li><a href="errata34.html#cvs"> May 5, 2004:
1.281 otto 387: Pathname validation problems have been found in cvs(1),
388: allowing clients and servers access to files outside the
389: repository or local CVS tree.</a>
1.294 david 390: <li><a href="errata34.html#openssl"> March 17, 2004:
1.277 millert 391: A missing check for a NULL-pointer dereference may allow a
1.281 otto 392: remote attacker to crash applications using OpenSSL.</a>
1.294 david 393: <li><a href="errata34.html#isakmpd2"> March 17, 2004:
1.276 brad 394: Defects in the payload validation and processing functions of
395: isakmpd have been discovered. An attacker could send malformed
396: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.294 david 397: <li><a href="errata34.html#httpd2"> March 13, 2004:
1.275 brad 398: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
399: access module, using IP addresses without a netmask on big endian
400: 64-bit platforms causes the rules to fail to match.</a>
1.294 david 401: <li><a href="errata34.html#ip6"> February 8, 2004:
1.272 dhartmei 402: An IPv6 MTU handling problem exists that could be used by an
403: attacker to cause a denial of service attack.</a>
1.294 david 404: <li><a href="errata34.html#sysvshm"> February 5, 2004:
1.271 millert 405: A reference counting bug in shmat(2) could be used to write to
406: kernel memory under certain circumstances.</a>
1.294 david 407: <li><a href="errata34.html#isakmpd">January 13, 2004:
1.266 brad 408: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 409: by Thomas Walpuski.</a>
1.294 david 410: <li><a href="errata34.html#ibcs2">November 17, 2003:
1.264 henning 411: It may be possible for a local user to overrun the stack in
412: compat_ibcs2(8) and cause a kernel panic.</a>
1.294 david 413: <li><a href="errata34.html#asn1">November 1, 2003:
1.262 margarid 414: The use of certain ASN.1 encodings or malformed public keys may
415: allow an attacker to mount a denial of service attack against
416: applications linked with ssl(3).</a>
1.261 david 417: </ul>
418:
419: <li>
1.288 matthieu 420: <a name="33"></a>
1.246 deraadt 421:
1.294 david 422: <h3><font color="#e00000">OpenBSD 3.3 Security Advisories</font></h3>
1.246 deraadt 423: These are the OpenBSD 3.3 advisories -- all these problems are solved
1.294 david 424: in <a href="anoncvs.html">OpenBSD current</a>. The
425: <a href="stable.html">patch branch</a> for 3.3 is no longer being maintained,
1.284 otto 426: you should update your machine.
1.246 deraadt 427: <p>
428: <ul>
1.294 david 429: <li><a href="errata33.html#cvs"> May 5, 2004:
1.281 otto 430: Pathname validation problems have been found in cvs(1),
431: allowing clients and servers access to files outside the
432: repository or local CVS tree.</a>
1.294 david 433: <li><a href="errata33.html#openssl"> March 17, 2004:
1.277 millert 434: A missing check for a NULL-pointer dereference may allow a
1.281 otto 435: remote attacker to crash applications using OpenSSL.</a>
1.294 david 436: <li><a href="errata33.html#isakmpd2"> March 17, 2004:
1.276 brad 437: Defects in the payload validation and processing functions of
438: isakmpd have been discovered. An attacker could send malformed
439: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.294 david 440: <li><a href="errata33.html#httpd2"> March 13, 2004:
1.275 brad 441: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
442: access module, using IP addresses without a netmask on big endian
443: 64-bit platforms causes the rules to fail to match.</a>
1.294 david 444: <li><a href="errata33.html#ip6"> February 8, 2004:
1.275 brad 445: An IPv6 MTU handling problem exists that could be used by an
446: attacker to cause a denial of service attack.</a>
1.294 david 447: <li><a href="errata33.html#sysvshm"> February 5, 2004:
1.271 millert 448: A reference counting bug in shmat(2) could be used to write to
449: kernel memory under certain circumstances.</a>
1.294 david 450: <li><a href="errata33.html#isakmpd">January 15, 2004:
1.268 brad 451: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 452: by Thomas Walpuski.</a>
1.294 david 453: <li><a href="errata33.html#ibcs2">November 17, 2003:
1.264 henning 454: It may be possible for a local user to execute arbitrary code
455: resulting in escalation of privileges due to a stack overrun
456: in compat_ibcs2(8).</a>
1.294 david 457: <li><a href="errata33.html#asn1">October 1, 2003:
1.257 millert 458: The use of certain ASN.1 encodings or malformed public keys may
459: allow an attacker to mount a denial of service attack against
460: applications linked with ssl(3).</a>
1.294 david 461: <li><a href="errata33.html#pfnorm">September 24, 2003:
1.258 beck 462: Access of freed memory in pf(4) could be used to
1.260 margarid 463: remotely panic a machine using scrub rules.</a>
1.294 david 464: <li><a href="errata33.html#sendmail">September 17, 2003:
1.256 millert 465: A buffer overflow in the address parsing in
466: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 467: <li><a href="errata33.html#sshbuffer">September 16, 2003:
1.255 millert 468: OpenSSH versions prior to 3.7 contains a buffer management error
469: that is potentially exploitable.</a>
1.294 david 470: <li><a href="errata33.html#sysvsem">September 10, 2003:
1.254 millert 471: Root may be able to reduce the security level by taking advantage of
472: an integer overflow when the semaphore limits are made very large.</a>
1.294 david 473: <li><a href="errata33.html#semget">August 20, 2003:
1.252 millert 474: An improper bounds check in the kernel may allow a local user
475: to panic the kernel.</a>
1.294 david 476: <li><a href="errata33.html#realpath">August 4, 2003:
1.249 millert 477: An off-by-one error exists in the C library function realpath(3)
478: may allow an attacker to gain escalated privileges.</a>
1.246 deraadt 479: </ul>
480:
1.265 miod 481:
1.247 david 482: <p>
1.246 deraadt 483: <li>
1.288 matthieu 484: <a name="32"></a>
1.224 deraadt 485:
1.294 david 486: <h3><font color="#e00000">OpenBSD 3.2 Security Advisories</font></h3>
1.224 deraadt 487: These are the OpenBSD 3.2 advisories -- all these problems are solved
1.294 david 488: in <a href="anoncvs.html">OpenBSD current</a>. The
489: <a href="stable.html">patch branch</a> for 3.2 is no longer being maintained,
1.265 miod 490: you should update your machine.
1.224 deraadt 491: <p>
492: <ul>
1.294 david 493: <li><a href="errata32.html#asn1">October 1, 2003:
1.257 millert 494: The use of certain ASN.1 encodings or malformed public keys may
495: allow an attacker to mount a denial of service attack against
496: applications linked with ssl(3). This does not affect OpenSSH.</a>
1.294 david 497: <li><a href="errata32.html#pfnorm">September 24, 2003:
1.258 beck 498: Access of freed memory in pf(4) could be used to
1.260 margarid 499: remotely panic a machine using scrub rules.</a>
1.294 david 500: <li><a href="errata32.html#sendmail4">September 17, 2003:
1.256 millert 501: A buffer overflow in the address parsing in
502: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 503: <li><a href="errata32.html#sshbuffer">September 16, 2003:
1.255 millert 504: OpenSSH versions prior to 3.7 contains a buffer management error
505: that is potentially exploitable.</a>
1.294 david 506: <li><a href="errata32.html#sendmail3">August 25, 2003:
1.253 brad 507: Fix for a potential security issue in
508: sendmail(8) with respect to DNS maps.</a>
1.294 david 509: <li><a href="errata32.html#realpath">August 4, 2003:
1.249 millert 510: An off-by-one error exists in the C library function realpath(3)
511: may allow an attacker to gain escalated privileges.</a>
1.294 david 512: <li><a href="errata32.html#sendmail2">March 31, 2003:
1.244 miod 513: A buffer overflow in the address parsing in
514: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 515: <li><a href="errata32.html#kerberos">March 24, 2003:
1.242 millert 516: A cryptographic weaknesses in the Kerberos v4 protocol can be
517: exploited on Kerberos v5 as well.</a>
1.294 david 518: <li><a href="errata32.html#kpr">March 19, 2003:
1.241 jufi 519: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 520: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.294 david 521: <li><a href="errata32.html#blinding">March 18, 2003:
1.239 miod 522: Various SSL and TLS operations in OpenSSL are vulnerable to
523: timing attacks.</a>
1.294 david 524: <li><a href="errata32.html#lprm">March 5, 2003:
1.238 millert 525: A buffer overflow in lprm(1) may allow an attacker to elevate
526: privileges to user daemon.</a>.
1.294 david 527: <li><a href="errata32.html#sendmail">March 3, 2003:
1.237 miod 528: A buffer overflow in the envelope comments processing in
529: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 530: <li><a href="errata32.html#httpd">February 25, 2003:
1.236 margarid 531: httpd(8) leaks file inode numbers via ETag header as well as
532: child PIDs in multipart MIME boundary generation. This could
533: lead, for example, to NFS exploitation because it uses inode
534: numbers as part of the file handle.</a>
1.294 david 535: <li><a href="errata32.html#ssl">February 22, 2003:
1.234 margarid 536: In ssl(8) an information leak can occur via timing by performing
537: a MAC computation even if incorrect block cipher padding has
538: been found, this is a countermeasure. Also, check for negative
539: sizes, in allocation routines.</a>
1.294 david 540: <li><a href="errata32.html#cvs">January 20, 2003:
1.232 millert 541: A double free exists in cvs(1) that could lead to privilege
542: escalation for cvs configurations where the cvs command is
1.233 margarid 543: run as a privileged user.</a>
1.294 david 544: <li><a href="errata32.html#named">November 14, 2002:
1.230 millert 545: A buffer overflow exists in named(8) that could lead to a
546: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 547: <li><a href="errata32.html#pool">November 6, 2002:
1.233 margarid 548: A logic error in the pool kernel memory allocator could cause
549: memory corruption in low-memory situations, causing the system
550: to crash.</a>
1.294 david 551: <li><a href="errata32.html#smrsh">November 6, 2002:
1.229 miod 552: An attacker can bypass smrsh(8)'s restrictions and execute
553: arbitrary commands with the privileges of his own account.</a>
1.294 david 554: <li><a href="errata32.html#pfbridge">November 6, 2002:
1.233 margarid 555: Network bridges running pf with scrubbing enabled could cause
556: mbuf corruption, causing the system to crash.</a>
1.294 david 557: <li><a href="errata32.html#kadmin">October 21, 2002:
1.228 miod 558: A buffer overflow can occur in the kadmind(8) daemon, leading
559: to possible remote crash or exploit.</a>
1.224 deraadt 560: </ul>
561:
1.227 miod 562: <p>
563: <li>
1.288 matthieu 564: <a name="31"></a>
1.203 deraadt 565:
1.294 david 566: <h3><font color="#e00000">OpenBSD 3.1 Security Advisories</font></h3>
1.203 deraadt 567: These are the OpenBSD 3.1 advisories -- all these problems are solved
1.294 david 568: in <a href="anoncvs.html">OpenBSD current</a>. The
569: <a href="stable.html">patch branch</a> for 3.1 is no longer being maintained,
1.258 beck 570: you should update your machine.
1.203 deraadt 571:
572: <p>
573: <ul>
1.294 david 574: <li><a href="errata31.html#sendmail2">March 31, 2003:
1.244 miod 575: A buffer overflow in the address parsing in
576: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 577: <li><a href="errata31.html#kerberos">March 24, 2003:
1.242 millert 578: A cryptographic weaknesses in the Kerberos v4 protocol can be
579: exploited on Kerberos v5 as well.</a>
1.294 david 580: <li><a href="errata31.html#kpr">March 19, 2003:
1.241 jufi 581: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 582: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.294 david 583: <li><a href="errata31.html#blinding">March 18, 2003:
1.239 miod 584: Various SSL and TLS operations in OpenSSL are vulnerable to
585: timing attacks.</a>
1.294 david 586: <li><a href="errata31.html#lprm">March 4, 2003:
1.238 millert 587: A buffer overflow in lprm(1) may allow an attacker to gain
588: root privileges.</a>
1.294 david 589: <li><a href="errata31.html#sendmail">March 3, 2003:
1.237 miod 590: A buffer overflow in the envelope comments processing in
591: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 592: <li><a href="errata31.html#ssl2">February 23, 2003:
1.235 miod 593: In ssl(8) an information leak can occur via timing by performing
594: a MAC computation even if incorrect block cipher padding has
595: been found, this is a countermeasure. Also, check for negative
596: sizes, in allocation routines.</a>
1.294 david 597: <li><a href="errata31.html#cvs">January 20, 2003:
1.232 millert 598: A double free exists in cvs(1) that could lead to privilege
599: escalation for cvs configurations where the cvs command is
1.294 david 600: run as a privileged user</a>.
601: <li><a href="errata31.html#named">November 14, 2002:
1.230 millert 602: A buffer overflow exists in named(8) that could lead to a
603: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 604: <li><a href="errata31.html#kernresource">November 6, 2002:
1.229 miod 605: Incorrect argument checking in the getitimer(2) system call
606: may allow an attacker to crash the system.</a>
1.294 david 607: <li><a href="errata31.html#smrsh">November 6, 2002:
1.229 miod 608: An attacker can bypass smrsh(8)'s restrictions and execute
609: arbitrary commands with the privileges of his own account.</a>
1.294 david 610: <li><a href="errata31.html#kadmin">October 21, 2002:
1.226 miod 611: A buffer overflow can occur in the kadmind(8) daemon, leading
612: to possible remote crash or exploit.</a>
1.294 david 613: <li><a href="errata31.html#kerntime">October 2, 2002:
1.222 jason 614: Incorrect argument checking in the setitimer(2) system call
615: may allow an attacker to write to kernel memory.</a>
1.294 david 616: <li><a href="errata31.html#scarg">August 11, 2002:
1.221 provos 617: An insufficient boundary check in the select system call
1.220 miod 618: allows an attacker to overwrite kernel memory and execute arbitrary code
619: in kernel context.</a>
1.294 david 620: <li><a href="errata31.html#ssl">July 30, 2002:
1.218 miod 621: Several remote buffer overflows can occur in the SSL2 server and SSL3
622: client of the ssl(8) library, as in the ASN.1 parser code in the
623: crypto(3) library, all of them being potentially remotely
624: exploitable.</a>
1.294 david 625: <li><a href="errata31.html#xdr">July 29, 2002:
1.218 miod 626: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
627: possible remote crash.</a>
1.294 david 628: <li><a href="errata31.html#pppd">July 29, 2002:
1.218 miod 629: A race condition exists in the pppd(8) daemon which may cause it to
630: alter the file permissions of an arbitrary file.</a>
1.294 david 631: <li><a href="errata31.html#isakmpd">July 5, 2002:
1.218 miod 632: Receiving IKE payloads out of sequence can cause isakmpd(8) to
633: crash.</a>
1.294 david 634: <li><a href="errata31.html#ktrace">June 27, 2002:
1.215 miod 635: The kernel would let any user ktrace set[ug]id processes.</a>
1.294 david 636: <li><a href="errata31.html#modssl">June 26, 2002:
1.213 miod 637: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 638: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.294 david 639: <li><a href="errata31.html#resolver">June 25, 2002:
1.212 millert 640: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 641: <li><a href="errata31.html#sshd">June 24, 2002:
1.216 deraadt 642: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 643: input validation error that can result in an integer overflow and
644: privilege escalation.</a>
1.294 david 645: <li><a href="errata31.html#httpd">June 19, 2002:
1.211 miod 646: A buffer overflow can occur during the interpretation of chunked
647: encoding in httpd(8), leading to possible remote crash.</a>
1.294 david 648: <li><a href="errata31.html#sshbsdauth">May 22, 2002:
1.209 markus 649: Under certain conditions, on systems using YP with netgroups
650: in the password database, it is possible that sshd(8) does
651: ACL checks for the requested user name but uses the password
652: database entry of a different user for authentication. This
653: means that denied users might authenticate successfully
654: while permitted users could be locked out.</a>
1.294 david 655: <li><a href="errata31.html#fdalloc2">May 8, 2002:
1.208 millert 656: A race condition exists that could defeat the kernel's
657: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 658: <li><a href="errata31.html#sudo">April 25, 2002:
1.205 millert 659: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 660: <li><a href="errata31.html#sshafs">April 22, 2002:
1.205 millert 661: A local user can gain super-user privileges due to a buffer
662: overflow in sshd(8) if AFS has been configured on the system
663: or if KerberosTgtPassing or AFSTokenPassing has been enabled
664: in the sshd_config file.</a>
1.203 deraadt 665: </ul>
666:
1.235 miod 667: <p>
1.203 deraadt 668: <li>
1.288 matthieu 669: <a name="30"></a>
1.187 deraadt 670:
1.294 david 671: <h3><font color="#e00000">OpenBSD 3.0 Security Advisories</font></h3>
1.187 deraadt 672: These are the OpenBSD 3.0 advisories -- all these problems are solved
1.294 david 673: in <a href="anoncvs.html">OpenBSD current</a>. The
674: <a href="stable.html">patch branch</a> for 3.0 is no longer being maintained,
1.258 beck 675: you should update your machine.
1.187 deraadt 676:
677: <p>
678: <ul>
1.294 david 679: <li><a href="errata30.html#named">November 14, 2002:
1.230 millert 680: A buffer overflow exists in named(8) that could lead to a
681: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 682: <li><a href="errata30.html#kernresource">November 6, 2002:
1.229 miod 683: Incorrect argument checking in the getitimer(2) system call
684: may allow an attacker to crash the system.</a>
1.294 david 685: <li><a href="errata30.html#smrsh">November 6, 2002:
1.229 miod 686: An attacker can bypass smrsh(8)'s restrictions and execute
687: arbitrary commands with the privileges of his own account.</a>
1.294 david 688: <li><a href="errata30.html#kadmin">October 21, 2002:
1.226 miod 689: A buffer overflow can occur in the kadmind(8) daemon, leading
690: to possible remote crash or exploit.</a>
1.294 david 691: <li><a href="errata30.html#kerntime">October 7, 2002:
1.223 miod 692: Incorrect argument checking in the setitimer(2) system call
693: may allow an attacker to write to kernel memory.</a>
1.294 david 694: <li><a href="errata30.html#scarg">August 11, 2002:
1.220 miod 695: An insufficient boundary check in the select and poll system calls
696: allows an attacker to overwrite kernel memory and execute arbitrary code
697: in kernel context.</a>
1.294 david 698: <li><a href="errata30.html#ssl">July 30, 2002:
1.218 miod 699: Several remote buffer overflows can occur in the SSL2 server and SSL3
700: client of the ssl(8) library, as in the ASN.1 parser code in the
701: crypto(3) library, all of them being potentially remotely
702: exploitable.</a>
1.294 david 703: <li><a href="errata30.html#xdr">July 29, 2002:
1.218 miod 704: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
705: possible remote crash.</a>
1.294 david 706: <li><a href="errata30.html#pppd">July 29, 2002:
1.218 miod 707: A race condition exists in the pppd(8) daemon which may cause it to
708: alter the file permissions of an arbitrary file.</a>
1.294 david 709: <li><a href="errata30.html#isakmpd2">July 5, 2002:
1.218 miod 710: Receiving IKE payloads out of sequence can cause isakmpd(8) to
711: crash.</a>
1.294 david 712: <li><a href="errata30.html#ktrace">June 27, 2002:
1.215 miod 713: The kernel would let any user ktrace set[ug]id processes.</a>
1.294 david 714: <li><a href="errata30.html#resolver">June 25, 2002:
1.212 millert 715: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 716: <li><a href="errata30.html#sshdauth">June 24, 2002:
1.216 deraadt 717: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 718: input validation error that can result in an integer overflow and
719: privilege escalation.</a>
1.294 david 720: <li><a href="errata30.html#modssl">June 24, 2002:
1.213 miod 721: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 722: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.294 david 723: <li><a href="errata30.html#httpd">June 19, 2002:
1.213 miod 724: A buffer overflow can occur during the interpretation of chunked
725: encoding in httpd(8), leading to possible remote crash.</a>
1.294 david 726: <li><a href="errata30.html#fdalloc2">May 8, 2002:
1.208 millert 727: A race condition exists that could defeat the kernel's
728: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 729: <li><a href="errata30.html#sudo2">April 25, 2002:
1.205 millert 730: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 731: <li><a href="errata30.html#sshafs">April 22, 2002:
1.205 millert 732: A local user can gain super-user privileges due to a buffer
733: overflow in sshd(8) if AFS has been configured on the system
734: or if KerberosTgtPassing or AFSTokenPassing has been enabled
735: in the sshd_config file.</a>
1.294 david 736: <li><a href="errata30.html#mail">April 11, 2002:
1.202 millert 737: The mail(1) was interpreting tilde escapes even when invoked
738: in non-interactive mode. As mail(1) is called as root from cron,
739: this can lead to a local root compromise.</a>
1.294 david 740: <li><a href="errata30.html#approval">March 19, 2002:
1.201 millert 741: Under certain conditions, on systems using YP with netgroups in
742: the password database, it is possible for the rexecd(8) and rshd(8)
743: daemons to execute a shell from a password database entry for a
744: different user. Similarly, atrun(8) may change to the wrong
745: home directory when running jobs.</a>
1.294 david 746: <li><a href="errata30.html#zlib">March 13, 2002:
1.200 millert 747: A potential double free() exists in the zlib library;
748: this is not exploitable on OpenBSD.
749: The kernel also contains a copy of zlib; it is not
750: currently known if the kernel zlib is exploitable.</a>
1.294 david 751: <li><a href="errata30.html#openssh">March 8, 2002:
1.198 millert 752: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 753: may allow a local user to gain super-user privileges.</a>
1.294 david 754: <li><a href="errata30.html#ptrace">January 21, 2002:
1.192 jason 755: A race condition between the ptrace(2) and execve(2) system calls
756: allows an attacker to modify the memory contents of suid/sgid
757: processes which could lead to compromise of the super-user account.</a>
1.294 david 758: <li><a href="errata30.html#sudo">January 17, 2002:
1.191 millert 759: There is a security hole in sudo(8) that can be exploited
760: when the Postfix sendmail replacement is installed that may
761: allow an attacker on the local host to gain root privileges.</a>
1.294 david 762: <li><a href="errata30.html#lpd">November 28, 2001:
1.189 millert 763: An attacker can trick a machine running the lpd daemon into
764: creating new files in the root directory from a machine with
765: remote line printer access.</a>
1.294 david 766: <li><a href="errata30.html#vi.recover">November 13, 2001:
1.188 millert 767: The vi.recover script can be abused in such a way as
768: to cause arbitrary zero-length files to be removed.</a>
1.294 david 769: <li><a href="errata30.html#pf">November 13, 2001:
1.190 mpech 770: pf(4) was incapable of dealing with certain ipv6 icmp packets,
771: resulting in a crash.</a>
1.294 david 772: <li><a href="errata30.html#sshd">November 12, 2001:
1.190 mpech 773: A security hole that may allow an attacker to partially authenticate
774: if -- and only if -- the administrator has enabled KerberosV.</a>
1.187 deraadt 775: </ul>
776:
777: <p>
778: <li>
1.288 matthieu 779: <a name="29"></a>
1.173 deraadt 780:
1.294 david 781: <h3><font color="#e00000">OpenBSD 2.9 Security Advisories</font></h3>
1.173 deraadt 782: These are the OpenBSD 2.9 advisories -- all these problems are solved
1.294 david 783: in <a href="anoncvs.html">OpenBSD current</a>. The
784: <a href="stable.html">patch branch</a>. for 2.9 is no longer being maintained,
1.258 beck 785: you should update your machine.
786:
1.173 deraadt 787:
788: <p>
789: <ul>
1.294 david 790: <li><a href="errata29.html#resolver">June 25, 2002:
1.212 millert 791: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 792: <li><a href="errata29.html#fdalloc2">May 8, 2002:
1.208 millert 793: A race condition exists that could defeat the kernel's
794: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 795: <li><a href="errata29.html#sudo2">April 25, 2002:
1.207 millert 796: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 797: <li><a href="errata29.html#sshafs">April 22, 2002:
1.206 millert 798: A local user can gain super-user privileges due to a buffer
799: overflow in sshd(8) if AFS has been configured on the system
800: or if KerberosTgtPassing or AFSTokenPassing has been enabled
801: in the sshd_config file.</a>
1.294 david 802: <li><a href="errata29.html#mail">April 11, 2002:
1.202 millert 803: The mail(1) was interpreting tilde escapes even when invoked
804: in non-interactive mode. As mail(1) is called as root from cron,
805: this can lead to a local root compromise.</a>
1.294 david 806: <li><a href="errata29.html#zlib">March 13, 2002:
1.200 millert 807: A potential double free() exists in the zlib library;
808: this is not exploitable on OpenBSD.
809: The kernel also contains a copy of zlib; it is not
810: currently known if the kernel zlib is exploitable.</a>
1.294 david 811: <li><a href="errata29.html#openssh">March 8, 2002:
1.198 millert 812: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 813: may allow a local user to gain super-user privileges.</a>
1.294 david 814: <li><a href="errata29.html#ptrace">January 21, 2002:
1.198 millert 815: A race condition between the ptrace(2) and execve(2) system calls
816: allows an attacker to modify the memory contents of suid/sgid
817: processes which could lead to compromise of the super-user account.</a>
1.294 david 818: <li><a href="errata29.html#sudo">January 17, 2002:
1.191 millert 819: There is a security hole in sudo(8) that can be exploited
820: when the Postfix sendmail replacement is installed that may
821: allow an attacker on the local host to gain root privileges.</a>
1.294 david 822: <li><a href="errata29.html#lpd2">November 28, 2001:
1.189 millert 823: An attacker can trick a machine running the lpd daemon into
824: creating new files in the root directory from a machine with
825: remote line printer access.</a>
1.294 david 826: <li><a href="errata29.html#vi.recover">November 13, 2001:
1.190 mpech 827: The vi.recover script can be abused in such a way as
828: to cause arbitrary zero-length files to be removed.</a>
1.294 david 829: <li><a href="errata29.html#uucp">September 11, 2001:
1.184 millert 830: A security hole exists in uuxqt(8) that may allow an
831: attacker to gain root privileges.</a>
1.294 david 832: <li><a href="errata29.html#lpd">August 29, 2001:
1.183 millert 833: A security hole exists in lpd(8) that may allow an
834: attacker to gain root privileges if lpd is running.</a>
1.294 david 835: <li><a href="errata29.html#sendmail2">August 21, 2001:
1.181 millert 836: A security hole exists in sendmail(8) that may allow an
837: attacker on the local host to gain root privileges.</a>
1.294 david 838: <li><a href="errata29.html#nfs">July 30, 2001:
1.180 jason 839: A kernel buffer overflow in the NFS code can be used to execute
840: arbitrary code by users with mount privileges (only root by
1.181 millert 841: default).</a>
1.294 david 842: <li><a href="errata29.html#kernexec">June 15, 2001:
1.178 aaron 843: A race condition in the kernel can lead to local root compromise.</a>
1.294 david 844: <li><a href="errata29.html#sshcookie">June 12, 2001:
1.177 markus 845: sshd(8) allows users to delete arbitrary files named "cookies"
846: if X11 forwarding is enabled. X11 forwarding is disabled
847: by default.</a>
1.294 david 848: <li><a href="errata29.html#fts">May 30, 2001:
1.176 millert 849: Programs using the fts routines can be tricked into changing
850: into the wrong directory.</a>
1.294 david 851: <li><a href="errata29.html#sendmail">May 29, 2001:
1.174 millert 852: Sendmail signal handlers contain unsafe code,
853: leading to numerous race conditions.</a>
1.173 deraadt 854: </ul>
855:
856: <p>
857: <li>
1.288 matthieu 858: <a name="28"></a>
1.152 deraadt 859:
1.294 david 860: <h3><font color="#e00000">OpenBSD 2.8 Security Advisories</font></h3>
1.152 deraadt 861: These are the OpenBSD 2.8 advisories -- all these problems are solved
1.294 david 862: in <a href="anoncvs.html">OpenBSD current</a>. The
863: <a href="stable.html">patch branch</a>. for 2.8 is no longer being maintained,
1.258 beck 864: you should update your machine.
865:
1.152 deraadt 866:
867: <p>
868: <ul>
1.294 david 869: <li><a href="errata28.html#uucp">September 11, 2001:
1.184 millert 870: A security hole exists in uuxqt(8) that may allow an
871: attacker to gain root privileges.</a>
1.294 david 872: <li><a href="errata28.html#lpd">August 29, 2001:
1.183 millert 873: A security hole exists in lpd(8) that may allow an
874: attacker to gain root privileges if lpd is running.</a>
1.294 david 875: <li><a href="errata28.html#sendmail2">August 21, 2001:
1.181 millert 876: A security hole exists in sendmail(8) that may allow an
877: attacker on the local host to gain root privileges.</a>
1.294 david 878: <li><a href="errata28.html#kernexec">June 15, 2001:
1.178 aaron 879: A race condition in the kernel can lead to local root compromise.</a>
1.294 david 880: <li><a href="errata28.html#fts">May 30, 2001:
1.176 millert 881: Programs using the fts routines can be tricked into changing
882: into the wrong directory.</a>
1.294 david 883: <li><a href="errata28.html#sendmail">May 29, 2001:
1.175 millert 884: Sendmail signal handlers contain unsafe code,
885: leading to numerous race conditions.</a>
1.294 david 886: <li><a href="errata28.html#ipf_frag">Apr 23, 2001:
1.231 mickey 887: IPF contains a serious bug with its handling of fragment caching.</a>
1.294 david 888: <li><a href="errata28.html#glob_limit">Apr 23, 2001:
1.172 ericj 889: ftpd(8) contains a potential DoS relating to glob(3).</a>
1.294 david 890: <li><a href="errata28.html#glob">Apr 10, 2001:
1.170 ericj 891: The glob(3) library call contains multiple buffer overflows.</a>
1.294 david 892: <li><a href="errata28.html#readline">Mar 18, 2001:
1.169 millert 893: The readline library creates history files with permissive modes based on the user's umask.</a>
1.294 david 894: <li><a href="errata28.html#ipsec_ah">Mar 2, 2001:
1.167 ericj 895: Insufficient checks in the IPSEC AH IPv4 option handling code can lead to a buffer overrun in the kernel.</a>
1.294 david 896: <li><a href="errata28.html#userldt">Mar 2, 2001:
1.168 horacio 897: The <b>USER_LDT</b> kernel option allows an attacker to gain access to privileged areas of kernel memory.</a>
1.294 david 898: <li><a href="errata28.html#sudo">Feb 22, 2001:
1.171 millert 899: a non-exploitable buffer overflow was fixed in sudo(8).</a>
1.294 david 900: <li><a href="errata28.html#named">Jan 29, 2001:
1.163 jason 901: merge named(8) with ISC BIND 4.9.8-REL, which fixes some buffer vulnerabilities.</a>
1.294 david 902: <li><a href="errata28.html#rnd">Jan 22, 2001:
1.162 jason 903: rnd(4) did not use all of its input when written to.</a>
1.294 david 904: <li><a href="errata28.html#xlock">Dec 22, 2000:
1.159 ericj 905: xlock(1)'s authentication was re-done to authenticate via a named pipe. (patch and new xlock binaries included).</a>
1.294 david 906: <li><a href="errata28.html#procfs">Dec 18, 2000:
1.157 ericj 907: Procfs contains numerous overflows. Procfs is not used by default in OpenBSD. (patch included).</a>
1.294 david 908: <li><a href="errata28.html#kerberos2">Dec 10, 2000:
1.156 deraadt 909: Another problem exists in KerberosIV libraries (patch included).</a>
1.294 david 910: <li><a href="errata28.html#kerberos">Dec 7, 2000:
1.155 deraadt 911: A set of problems in KerberosIV exist (patch included).</a>
1.294 david 912: <li><a href="errata28.html#ftpd">Dec 4, 2000:
1.154 millert 913: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.152 deraadt 914: </ul>
915:
916: <p>
917: <li>
1.288 matthieu 918: <a name="27"></a>
1.124 deraadt 919:
1.294 david 920: <h3><font color="#e00000">OpenBSD 2.7 Security Advisories</font></h3>
1.124 deraadt 921: These are the OpenBSD 2.7 advisories -- all these problems are solved
1.294 david 922: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.124 deraadt 923: OpenBSD 2.6 advisories listed below are fixed in OpenBSD 2.7.
924:
925: <p>
926: <ul>
1.294 david 927: <li><a href="errata27.html#readline">Mar 18, 2001:
1.169 millert 928: The readline library creates history files with permissive modes based on the user's umask.</a>
1.294 david 929: <li><a href="errata27.html#sudo">Feb 22, 2001:
1.169 millert 930: a buffer overflow was fixed in sudo(8).</a>
1.294 david 931: <li><a href="errata27.html#ftpd">Dec 4, 2000:
1.154 millert 932: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.294 david 933: <li><a href="errata27.html#sshforwarding">Nov 10, 2000:
1.152 deraadt 934: Hostile servers can force OpenSSH clients to do agent or X11 forwarding.
935: (patch included)</a>
1.294 david 936: <li><a href="errata27.html#xtrans">Oct 26, 2000:
1.151 matthieu 937: X11 libraries have 2 potential overflows in xtrans code.
938: (patch included)</a>
1.294 david 939: <li><a href="errata27.html#httpd">Oct 18, 2000:
1.150 beck 940: Apache mod_rewrite and mod_vhost_alias modules could expose files
941: on the server in certain configurations if used.
942: (patch included)</a>
1.294 david 943: <li><a href="errata27.html#telnetd">Oct 10, 2000:
1.149 millert 944: The telnet daemon does not strip out the TERMINFO, TERMINFO_DIRS,
945: TERMPATH and TERMCAP environment variables as it should.
946: (patch included)</a>
1.294 david 947: <li><a href="errata27.html#format_strings">Oct 6, 2000:
1.148 millert 948: There are printf-style format string bugs in several privileged
949: programs. (patch included)</a>
1.294 david 950: <li><a href="errata27.html#curses">Oct 6, 2000:
1.147 millert 951: libcurses honored terminal descriptions in the $HOME/.terminfo
952: directory as well as in the TERMCAP environment variable for
953: setuid and setgid applications.
1.146 deraadt 954: (patch included)</a>
1.294 david 955: <li><a href="errata27.html#talkd">Oct 6, 2000:
1.146 deraadt 956: A format string vulnerability exists in talkd(8).
957: (patch included)</a>
1.294 david 958: <li><a href="errata27.html#pw_error">Oct 3, 2000:
1.145 aaron 959: A format string vulnerability exists in the pw_error() function of the
960: libutil library, yielding localhost root through chpass(1).
961: (patch included)</a>
1.294 david 962: <li><a href="errata27.html#ipsec">Sep 18, 2000:
1.144 jason 963: Bad ESP/AH packets could cause a crash under certain conditions.
964: (patch included)</a>
1.294 david 965: <li><a href="errata27.html#xlock">Aug 16, 2000:
1.141 deraadt 966: A format string vulnerability (localhost root) exists in xlock(1).
967: (patch included)</a>
1.294 david 968: <li><a href="errata27.html#X11_libs">July 14, 2000:
1.139 deraadt 969: Various bugs found in X11 libraries have various side effects, almost
970: completely denial of service in OpenBSD.
971: (patch included)</a>
1.294 david 972: <li><a href="errata27.html#ftpd">July 5, 2000:
1.136 deraadt 973: Just like pretty much all the other unix ftp daemons
974: on the planet, ftpd had a remote root hole in it.
975: Luckily, ftpd was not enabled by default.
1.137 deraadt 976: The problem exists if anonymous ftp is enabled.
1.136 deraadt 977: (patch included)</a>
1.294 david 978: <li><a href="errata27.html#mopd">July 5, 2000:
1.136 deraadt 979: Mopd, very rarely used, contained some buffer overflows.
980: (patch included)</a>
1.294 david 981: <li><a href="errata27.html#libedit">June 28, 2000:
1.135 deraadt 982: libedit would check for a <b>.editrc</b> file in the current
983: directory. Not known to be a real security issue, but a patch
984: is available anyways.
985: (patch included)</a>
1.294 david 986: <li><a href="errata27.html#dhclient">June 24, 2000:
1.134 deraadt 987: A serious bug in dhclient(8) could allow strings from a
988: malicious dhcp server to be executed in the shell as root.
989: (patch included)</a>
1.294 david 990: <li><a href="errata27.html#isakmpd">June 9, 2000:
1.133 deraadt 991: A serious bug in isakmpd(8) policy handling wherein
992: policy verification could be completely bypassed in isakmpd.
993: (patch included)</a>
1.294 david 994: <li><a href="errata27.html#uselogin">June 6, 2000:
1.132 deraadt 995: The non-default flag UseLogin in <b>/etc/sshd_config</b> is broken,
996: should not be used, and results in security problems on
997: other operating systems.</a>
1.294 david 998: <li><a href="errata27.html#bridge">May 26, 2000:
1.129 deraadt 999: The bridge(4) <i>learning</i> flag may be bypassed.
1.128 deraadt 1000: (patch included)</a>
1.294 david 1001: <li><a href="errata27.html#ipf">May 25, 2000:
1.127 kjell 1002: Improper use of ipf <i>keep-state</i> rules can result
1003: in firewall rules being bypassed. (patch included)</a>
1004:
1.124 deraadt 1005: </ul>
1006:
1007: <p>
1008: <li>
1.288 matthieu 1009: <a name="26"></a>
1.119 deraadt 1010:
1.294 david 1011: <h3><font color="#e00000">OpenBSD 2.6 Security Advisories</font></h3>
1.119 deraadt 1012: These are the OpenBSD 2.6 advisories -- all these problems are solved
1.294 david 1013: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.119 deraadt 1014: OpenBSD 2.5 advisories listed below are fixed in OpenBSD 2.6.
1015:
1016: <p>
1017: <ul>
1.294 david 1018: <li><a href="errata26.html#semconfig">May 26, 2000:
1.130 deraadt 1019: SYSV semaphore support contained an undocumented system call
1.131 deraadt 1020: which could wedge semaphore-using processes from exiting. (patch included)</a>
1.294 david 1021: <li><a href="errata26.html#ipf">May 25, 2000:
1.127 kjell 1022: Improper use of ipf <i>keep-state</i> rules can result
1023: in firewall rules being bypassed. (patch included)</a>
1.294 david 1024: <li><a href="errata26.html#xlockmore">May 25, 2000:
1.125 deraadt 1025: xlockmore has a bug which a localhost attacker can use to gain
1026: access to the encrypted root password hash (which is normally
1.245 miod 1027: encoded using blowfish</a> (see
1.294 david 1028: <a href="http://www.openbsd.org/cgi-bin/man.cgi?query=crypt&sektion=3">
1.125 deraadt 1029: crypt(3)</a>)
1.245 miod 1030: (patch included).
1.294 david 1031: <li><a href="errata26.html#procfs">Jan 20, 2000:
1.123 deraadt 1032: Systems running with procfs enabled and mounted are
1033: vulnerable to a very tricky exploit. procfs is not
1034: mounted by default.
1035: (patch included).</a>
1.294 david 1036: <li><a href="errata26.html#sendmail">Dec 4, 1999:
1.296 david 1037: Sendmail permitted any user to cause an aliases file wrap,
1.190 mpech 1038: thus exposing the system to a race where the aliases file
1039: did not exist.
1.119 deraadt 1040: (patch included).</a>
1.294 david 1041: <li><a href="errata26.html#poll">Dec 4, 1999:
1.190 mpech 1042: Various bugs in poll(2) may cause a kernel crash.</a>
1.294 david 1043: <li><a href="errata26.html#sslUSA">Dec 2, 1999:
1.120 deraadt 1044: A buffer overflow in the RSAREF code included in the
1045: USA version of libssl, is possibly exploitable in
1046: httpd, ssh, or isakmpd, if SSL/RSA features are enabled.
1.124 deraadt 1047: (patch included).<br></a>
1048: <strong>Update:</strong> Turns out that this was not exploitable
1049: in any of the software included in OpenBSD 2.6.
1.294 david 1050: <li><a href="errata26.html#ifmedia">Nov 9, 1999:
1.190 mpech 1051: Any user could change interface media configurations, resulting in
1052: a localhost denial of service attack.
1.121 deraadt 1053: (patch included).</a>
1.119 deraadt 1054: </ul>
1055:
1056: <p>
1057: <li>
1.288 matthieu 1058: <a name="25"></a>
1.106 deraadt 1059:
1.294 david 1060: <h3><font color="#e00000">OpenBSD 2.5 Security Advisories</font></h3>
1.93 deraadt 1061: These are the OpenBSD 2.5 advisories -- all these problems are solved
1.294 david 1062: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.93 deraadt 1063: OpenBSD 2.4 advisories listed below are fixed in OpenBSD 2.5.
1064:
1.96 deraadt 1065: <p>
1.104 deraadt 1066: <ul>
1.294 david 1067: <li><a href="errata25.html#cron">Aug 30, 1999:
1.103 deraadt 1068: In cron(8), make sure argv[] is NULL terminated in the
1069: fake popen() and run sendmail as the user, not as root.
1070: (patch included).</a>
1.294 david 1071: <li><a href="errata25.html#miscfs">Aug 12, 1999: The procfs and fdescfs
1.101 deraadt 1072: filesystems had an overrun in their handling of uio_offset
1073: in their readdir() routines. (These filesystems are not
1074: enabled by default). (patch included).</a>
1.294 david 1075: <li><a href="errata25.html#profil">Aug 9, 1999: Stop profiling (see profil(2))
1.100 deraadt 1076: when we execve() a new process. (patch included).</a>
1.294 david 1077: <li><a href="errata25.html#ipsec_in_use">Aug 6, 1999: Packets that should have
1.98 deraadt 1078: been handled by IPsec may be transmitted as cleartext.
1079: PF_KEY SA expirations may leak kernel resources.
1080: (patch included).</a>
1.294 david 1081: <li><a href="errata25.html#rc">Aug 5, 1999: In /etc/rc, use mktemp(1) for
1.97 deraadt 1082: motd re-writing and change the find(1) to use -execdir
1083: (patch included).</a>
1.294 david 1084: <li><a href="errata25.html#chflags">Jul 30, 1999: Do not permit regular
1.95 deraadt 1085: users to chflags(2) or fchflags(2) on character or block devices
1086: which they may currently be the owner of (patch included).</a>
1.294 david 1087: <li><a href="errata25.html#nroff">Jul 27, 1999: Cause groff(1) to be invoked
1.95 deraadt 1088: with the -S flag, when called by nroff(1) (patch included).</a>
1.93 deraadt 1089: </ul>
1090:
1.106 deraadt 1091: <p>
1092: <li>
1.288 matthieu 1093: <a name="24"></a>
1.235 miod 1094:
1.294 david 1095: <h3><font color="#e00000">OpenBSD 2.4 Security Advisories</font></h3>
1.75 deraadt 1096: These are the OpenBSD 2.4 advisories -- all these problems are solved
1.294 david 1097: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.75 deraadt 1098: OpenBSD 2.3 advisories listed below are fixed in OpenBSD 2.4.
1099:
1.96 deraadt 1100: <p>
1.75 deraadt 1101: <ul>
1.294 david 1102: <li><a href="errata24.html#poll">Mar 22, 1999: The nfds argument for poll(2) needs
1.91 deraadt 1103: to be constrained, to avoid kvm starvation (patch included).</a>
1.294 david 1104: <li><a href="errata24.html#tss">Mar 21, 1999: A change in TSS handling stops
1.91 deraadt 1105: another kernel crash case caused by the <strong>crashme</strong>
1106: program (patch included).</a>
1.294 david 1107: <li><a href="errata24.html#nlink">Feb 25, 1999: An unbounded increment on the
1.90 deraadt 1108: nlink value in FFS and EXT2FS filesystems can cause a system crash.
1.89 deraadt 1109: (patch included).</a>
1.294 david 1110: <li><a href="errata24.html#ping">Feb 23, 1999: Yet another buffer overflow
1.88 deraadt 1111: existed in ping(8). (patch included).</a>
1.294 david 1112: <li><a href="errata24.html#ipqrace">Feb 19, 1999: ipintr() had a race in use of
1.87 deraadt 1113: the ipq, which could permit an attacker to cause a crash.
1114: (patch included).</a>
1.294 david 1115: <li><a href="errata24.html#accept">Feb 17, 1999: A race condition in the
1.86 deraadt 1116: kernel between accept(2) and select(2) could permit an attacker
1117: to hang sockets from remote.
1118: (patch included).</a>
1.294 david 1119: <li><a href="errata24.html#maxqueue">Feb 17, 1999: IP fragment assembly can
1.85 deraadt 1120: bog the machine excessively and cause problems.
1121: (patch included).</a>
1.294 david 1122: <li><a href="errata24.html#trctrap">Feb 12, 1999: i386 T_TRCTRAP handling and
1.84 deraadt 1123: DDB interacted to possibly cause a crash.
1124: (patch included).</a>
1.294 david 1125: <li><a href="errata24.html#rst">Feb 11, 1999: TCP/IP RST handling was sloppy.
1.83 deraadt 1126: (patch included).</a>
1.294 david 1127: <li><a href="errata24.html#bootpd">Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 1128: problem in bootpd(8). (patch included).</a>
1.294 david 1129: <li><a href="errata24.html#termcap">Nov 19, 1998: There is a possibly locally
1.82 deraadt 1130: exploitable problem relating to environment variables in termcap
1131: and curses. (patch included).</a>
1.294 david 1132: <li><a href="errata24.html#tcpfix">Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 1133: bug in the TCP decoding kernel. (patch included).</a>
1.75 deraadt 1134: </ul>
1135:
1.106 deraadt 1136: <p>
1137: <li>
1.288 matthieu 1138: <a name="23"></a>
1.235 miod 1139:
1.294 david 1140: <h3><font color="#e00000">OpenBSD 2.3 Security Advisories</font></h3>
1.73 deraadt 1141: These are the OpenBSD 2.3 advisories -- all these problems are solved
1.294 david 1142: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.73 deraadt 1143: OpenBSD 2.2 advisories listed below are fixed in OpenBSD 2.3.
1.53 matthieu 1144:
1.96 deraadt 1145: <p>
1.53 matthieu 1146: <ul>
1.294 david 1147: <li><a href="errata23.html#bootpd">Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 1148: problem in bootpd(8). (patch included).</a>
1.294 david 1149: <li><a href="errata23.html#tcpfix">Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 1150: bug in the TCP decoding kernel. (patch included).</a>
1.294 david 1151: <li><a href="errata23.html#resolver">August 31, 1998: A benign looking resolver
1.190 mpech 1152: buffer overflow bug was re-introduced accidentally (patches included).</a>
1.294 david 1153: <li><a href="errata23.html#chpass">Aug 2, 1998:
1.190 mpech 1154: chpass(1) has a file descriptor leak which allows an
1155: attacker to modify /etc/master.passwd.</a>
1.294 david 1156: <li><a href="errata23.html#inetd">July 15, 1998: Inetd had a file descriptor leak.</a>
1157: <li><a href="errata23.html#fdalloc">Jul 2, 1998: setuid and setgid processes
1.72 deraadt 1158: should not be executed with fd slots 0, 1, or 2 free.
1159: (patch included).</a>
1.294 david 1160: <li><a href="errata23.html#xlib">June 6, 1998: Further problems with the X
1.71 deraadt 1161: libraries (patches included).</a>
1.294 david 1162: <li><a href="errata23.html#kill">May 17, 1998: kill(2) of setuid/setgid target
1.66 deraadt 1163: processes too permissive (4th revision patch included).</a>
1.294 david 1164: <li><a href="errata23.html#immutable">May 11, 1998: mmap() permits partial bypassing
1.60 deraadt 1165: of immutable and append-only file flags. (patch included).</a>
1.294 david 1166: <li><a href="errata23.html#ipsec">May 5, 1998: Incorrect handling of IPSEC packets
1.190 mpech 1167: if IPSEC is enabled (patch included).</a>
1.294 david 1168: <li><a href="errata23.html#xterm-xaw">May 1, 1998: Buffer overflow in xterm and Xaw
1.58 deraadt 1169: (CERT advisory VB-98.04) (patch included).</a>
1.53 matthieu 1170: </ul>
1.9 deraadt 1171:
1.106 deraadt 1172: <p>
1173: <li>
1.288 matthieu 1174: <a name="22"></a>
1.235 miod 1175:
1.294 david 1176: <h3><font color="#e00000">OpenBSD 2.2 Security Advisories</font></h3>
1.45 deraadt 1177: These are the OpenBSD 2.2 advisories. All these problems are solved
1.294 david 1178: in <a href="23.html">OpenBSD 2.3</a>. Some of these problems
1.45 deraadt 1179: still exist in other operating systems. (The supplied patches are for
1180: OpenBSD 2.2; they may or may not work on OpenBSD 2.1).
1.9 deraadt 1181:
1.96 deraadt 1182: <p>
1.9 deraadt 1183: <ul>
1.294 david 1184: <li><a href="errata22.html#ipsec">May 5, 1998: Incorrect handling of IPSEC
1.72 deraadt 1185: packets if IPSEC is enabled (patch included).</a>
1.294 david 1186: <li><a href="errata22.html#xterm-xaw">May 1, 1998: Buffer overflow in xterm
1.72 deraadt 1187: and Xaw (CERT advisory VB-98.04) (patch included).</a>
1.294 david 1188: <li><a href="errata22.html#uucpd">Apr 22, 1998: Buffer overflow in uucpd
1.72 deraadt 1189: (patch included).</a>
1.294 david 1190: <li><a href="errata22.html#rmjob">Apr 22, 1998: Buffer mismanagement in lprm
1.72 deraadt 1191: (patch included).</a>
1.294 david 1192: <li><a href="errata22.html#ping">Mar 31, 1998: Overflow in ping -R (patch included).</a>
1193: <li><a href="errata22.html#named">Mar 30, 1998: Overflow in named fake-iquery
1.59 deraadt 1194: (patch included).</a>
1.294 david 1195: <li><a href="errata22.html#mountd">Mar 2, 1998: Accidental NFS filesystem
1.72 deraadt 1196: export (patch included).</a>
1.112 philen 1197: <li><a href="advisories/mmap.txt">Feb 26, 1998: Read-write mmap() flaw.</a>
1.294 david 1198: Revision 3 of the patch is available <a href="errata22.html#mmap">here</a>
1.112 philen 1199: <li><a href="advisories/sourceroute.txt">Feb 19, 1998: Sourcerouted Packet
1.59 deraadt 1200: Acceptance.</a>
1.294 david 1201: A patch is available <a href="errata22.html#sourceroute">here</a>.
1202: <li><a href="errata22.html#ruserok">Feb 13, 1998: Setuid coredump & Ruserok()
1.72 deraadt 1203: flaw (patch included).</a>
1.294 david 1204: <li><a href="errata22.html#ldso">Feb 9, 1998: MIPS ld.so flaw (patch included).</a>
1.1 deraadt 1205: </ul>
1206:
1.106 deraadt 1207: <p>
1208: <li>
1.288 matthieu 1209: <a name="21"></a>
1.235 miod 1210:
1.294 david 1211: <h3><font color="#e00000">OpenBSD 2.1 Security Advisories</font></h3>
1.52 deraadt 1212: These are the OpenBSD 2.1 advisories. All these problems are solved
1.294 david 1213: in <a href="22.html">OpenBSD 2.2</a>. Some of these problems still
1.52 deraadt 1214: exist in other operating systems. (If you are running OpenBSD 2.1, we
1215: would strongly recommend an upgrade to the newest release, as this
1216: patch list only attempts at fixing the most important security
1217: problems. In particular, OpenBSD 2.2 fixes numerous localhost
1218: security problems. Many of those problems were solved in ways which
1219: make it hard for us to provide patches).
1220:
1.96 deraadt 1221: <p>
1.52 deraadt 1222: <ul>
1.112 philen 1223: <li><a href="advisories/signals.txt">Sep 15, 1997: Deviant Signals (patch included)</a>
1224: <li><a href="advisories/rfork.txt">Aug 2, 1997: Rfork() system call flaw
1.59 deraadt 1225: (patch included)</a>
1.112 philen 1226: <li><a href="advisories/procfs.txt">Jun 24, 1997: Procfs flaws (patch included)</a>
1.52 deraadt 1227: </ul>
1.51 deraadt 1228:
1.106 deraadt 1229: <p>
1230: <li>
1.288 matthieu 1231: <a name="20"></a>
1.235 miod 1232:
1.294 david 1233: <h3><font color="#e00000">OpenBSD 2.0 Security Advisories</font></h3>
1.99 deraadt 1234: These are the OpenBSD 2.0 advisories. All these problems are solved
1.294 david 1235: in <a href="21.html">OpenBSD 2.1</a>. Some of these problems still
1.99 deraadt 1236: exist in other operating systems. (If you are running OpenBSD 2.0, we
1237: commend you for being there back in the old days!, but you're really
1238: missing out if you don't install a new version!)
1239:
1240: <p>
1241: <ul>
1.112 philen 1242: <li><a href="advisories/res_random.txt">April 22, 1997: Predictable IDs in the
1.99 deraadt 1243: resolver (patch included)</a>
1244: <li>Many others... if people can hunt them down, please let me know
1245: and we'll put them up here.
1246: </ul>
1.51 deraadt 1247: <p>
1.106 deraadt 1248:
1.288 matthieu 1249: <a name="watching"></a>
1.294 david 1250: <li><h3><font color="#e00000">Watching our Changes</font></h3><p>
1.106 deraadt 1251:
1.21 deraadt 1252: Since we take a proactive stance with security, we are continually
1253: finding and fixing new security problems. Not all of these problems
1.80 espie 1254: get widely reported because (as stated earlier) many of them are not
1.45 deraadt 1255: confirmed to be exploitable; many simple bugs we fix do turn out to
1256: have security consequences we could not predict. We do not have the
1257: time resources to make these changes available in the above format.<p>
1.21 deraadt 1258:
1259: Thus there are usually minor security fixes in the current source code
1260: beyond the previous major OpenBSD release. We make a limited
1.45 deraadt 1261: guarantee that these problems are of minimal impact and unproven
1.44 ian 1262: exploitability. If we discover that a problem definitely matters for
1.45 deraadt 1263: security, patches will show up here <strong>VERY</strong> quickly.<p>
1.21 deraadt 1264:
1.45 deraadt 1265: People who are really concerned with security can do a number of
1266: things:<p>
1.21 deraadt 1267:
1268: <ul>
1269: <li>If you understand security issues, watch our
1.294 david 1270: <a href="mail.html">source-changes mailing list</a> and keep an
1.23 deraadt 1271: eye out for things which appear security related. Since
1.21 deraadt 1272: exploitability is not proven for many of the fixes we make,
1273: do not expect the relevant commit message to say "SECURITY FIX!".
1274: If a problem is proven and serious, a patch will be available
1275: here very shortly after.
1.161 horacio 1276: <li>In addition to source changes, you can watch our <a href="mail.html">
1.160 ericj 1277: security-announce mailing list</a> which will notify you for every
1.186 ian 1278: security related item that the OpenBSD team deems as a possible threat,
1.160 ericj 1279: and instruct you on how to patch the problem.
1.21 deraadt 1280: <li>Track our current source code tree, and teach yourself how to do a
1.29 deraadt 1281: complete system build from time to time (read /usr/src/Makefile
1282: carefully). Users can make the assumption that the current
1283: source tree always has stronger security than the previous release.
1.45 deraadt 1284: However, building your own system from source code is not trivial;
1.265 miod 1285: it is nearly 600MB of source code, and problems do occur as we
1.45 deraadt 1286: transition between major releases.
1.115 ericj 1287: <li>Install a binary snapshot for your
1.80 espie 1288: architecture, which are made available fairly often. For
1.29 deraadt 1289: instance, an i386 snapshot is typically made available weekly.
1.21 deraadt 1290: </ul>
1291:
1.9 deraadt 1292: <p>
1.288 matthieu 1293: <a name="reporting"></a>
1.294 david 1294: <li><h3><font color="#e00000">Reporting problems</font></h3><p>
1.3 deraadt 1295:
1.5 deraadt 1296: <p> If you find a new security problem, you can mail it to
1.294 david 1297: <a href="mailto:deraadt@openbsd.org">deraadt@openbsd.org</a>.
1.7 deraadt 1298: <br>
1.5 deraadt 1299: If you wish to PGP encode it (but please only do so if privacy is very
1.112 philen 1300: urgent, since it is inconvenient) use this <a href="advisories/pgpkey.txt">pgp key</a>.
1.5 deraadt 1301:
1.107 deraadt 1302: <p>
1.288 matthieu 1303: <a name="papers"></a>
1.294 david 1304: <li><h3><font color="#e00000">Further Reading</font></h3><p>
1.107 deraadt 1305:
1306: A number of papers have been written by OpenBSD team members, about security
1307: related changes they have done in OpenBSD. The postscript versions of these
1.108 deraadt 1308: documents are available as follows.<p>
1.107 deraadt 1309:
1310: <ul>
1.113 deraadt 1311: <li>A Future-Adaptable Password Scheme.<br>
1.294 david 1312: <a href="events.html#usenix99">Usenix 1999</a>,
1313: by <a href="mailto:provos@openbsd.org">Niels Provos</a>,
1314: <a href="mailto:dm@openbsd.org">David Mazieres</a>.<br>
1315: <a href="papers/bcrypt-paper.ps">paper</a> and
1316: <a href="papers/bcrypt-slides.ps">slides</a>.
1.113 deraadt 1317: <p>
1318: <li>Cryptography in OpenBSD: An Overview.<br>
1.294 david 1319: <a href="events.html#usenix99">Usenix 1999</a>,
1320: by <a href="mailto:deraadt@openbsd.org">Theo de Raadt</a>,
1321: <a href="mailto:niklas@openbsd.org">Niklas Hallqvist</a>,
1322: <a href="mailto:art@openbsd.org">Artur Grabowski</a>,
1323: <a href="mailto:angelos@openbsd.org">Angelos D. Keromytis</a>,
1324: <a href="mailto:provos@openbsd.org">Niels Provos</a>.<br>
1325: <a href="papers/crypt-paper.ps">paper</a> and
1326: <a href="papers/crypt-slides.ps">slides</a>.
1.113 deraadt 1327: <p>
1328: <li>strlcpy and strlcat -- consistent, safe, string copy and concatenation.<br>
1.294 david 1329: <a href="events.html#usenix99">Usenix 1999</a>,
1330: by <a href="mailto:millert@openbsd.org">Todd C. Miller</a>,
1331: <a href="mailto:deraadt@openbsd.org">Theo de Raadt</a>.<br>
1332: <a href="papers/strlcpy-paper.ps">paper</a> and
1333: <a href="papers/strlcpy-slides.ps">slides</a>.
1.113 deraadt 1334: <p>
1.118 deraadt 1335: <li>Dealing with Public Ethernet Jacks-Switches, Gateways, and Authentication.<br>
1.294 david 1336: <a href="events.html#lisa99">LISA 1999</a>,
1337: by <a href="mailto:beck@openbsd.org">Bob Beck</a>.<br>
1338: <a href="papers/authgw-paper.ps">paper</a> and
1339: <a href="papers/authgw-slides.ps">slides</a>.
1.118 deraadt 1340: <p>
1.153 jufi 1341: <li>Encrypting Virtual Memory<br>
1.294 david 1342: <a href="events.html#sec2000">Usenix Security 2000</a>,
1343: <a href="mailto:provos@openbsd.org">Niels Provos</a>.<br>
1344: <a href="papers/swapencrypt.ps">paper</a> and
1345: <a href="papers/swapencrypt-slides.ps">slides</a>.
1.142 deraadt 1346: <p>
1.107 deraadt 1347: </ul>
1.294 david 1348: </ul>
1.106 deraadt 1349:
1.2 deraadt 1350: <hr>
1.294 david 1351: <a href="index.html"><img height=24 width=24 src="back.gif" border=0 alt="OpenBSD"></a>
1352: <a href="mailto:www@openbsd.org">www@openbsd.org</a>
1.24 deraadt 1353: <br>
1.312 ! david 1354: <small>$OpenBSD: security.html,v 1.311 2005/05/17 16:21:23 deraadt Exp $</small>
1.1 deraadt 1355:
1.24 deraadt 1356: </body>
1357: </html>
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