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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>,
58: <a href="#36">3.6</a>.
1.114 philen 59: </td>
60: </tr>
61: </table>
1.56 deraadt 62: <hr>
63:
1.294 david 64: <a name="goals"></a>
1.278 deraadt 65: <ul>
1.294 david 66: <li><h3><font color="#e00000">Goal</font></h3><p>
1.22 deraadt 67:
1.14 deraadt 68: OpenBSD believes in strong security. Our aspiration is to be NUMBER
1.22 deraadt 69: ONE in the industry for security (if we are not already there). Our
70: open software development model permits us to take a more
71: uncompromising view towards increased security than Sun, SGI, IBM, HP,
72: or other vendors are able to. We can make changes the vendors would
1.27 deraadt 73: not make. Also, since OpenBSD is exported with <a href=crypto.html>
1.45 deraadt 74: cryptography</a>, we are able to take cryptographic approaches towards
75: fixing security problems.<p>
1.18 deraadt 76:
1.288 matthieu 77: <a name="disclosure"></a>
1.294 david 78: <li><h3><font color="#e00000">Full Disclosure</font></h3><p>
1.106 deraadt 79:
1.45 deraadt 80: Like many readers of the
1.196 jufi 81: <a href="http://online.securityfocus.com/archive/1">
1.18 deraadt 82: BUGTRAQ mailing list</a>,
1.106 deraadt 83: we believe in full disclosure of security problems. In the
84: operating system arena, we were probably the first to embrace
85: the concept. Many vendors, even of free software, still try
86: to hide issues from their users.<p>
87:
88: Security information moves very fast in cracker circles. On the other
89: hand, our experience is that coding and releasing of proper security
90: fixes typically requires about an hour of work -- very fast fix
91: turnaround is possible. Thus we think that full disclosure helps the
92: people who really care about security.<p>
93:
1.288 matthieu 94: <a name="process"></a>
1.294 david 95: <li><h3><font color="#e00000">Audit Process</font></h3><p>
1.15 deraadt 96:
1.12 deraadt 97: Our security auditing team typically has between six and twelve
1.45 deraadt 98: members who continue to search for and fix new security holes. We
99: have been auditing since the summer of 1996. The process we follow to
100: increase security is simply a comprehensive file-by-file analysis of
1.106 deraadt 101: every critical software component. We are not so much looking for
102: security holes, as we are looking for basic software bugs, and if
1.138 deraadt 103: years later someone discovers the problem used to be a security
1.106 deraadt 104: issue, and we fixed it because it was just a bug, well, all the
105: better. Flaws have been found in just about every area of the system.
106: Entire new classes of security problems have been found during our
107: audit, and often source code which had been audited earlier needs
108: re-auditing with these new flaws in mind. Code often gets audited
109: multiple times, and by multiple people with different auditing
110: skills.<p>
1.12 deraadt 111:
1.94 deraadt 112: Some members of our security auditing team worked for Secure Networks,
113: the company that made the industry's premier network security scanning
114: software package Ballista (Secure Networks got purchased by Network
115: Associates, Ballista got renamed to Cybercop Scanner, and well...)
116: That company did a lot of security research, and thus fit in well
1.106 deraadt 117: with the OpenBSD stance. OpenBSD passed Ballista's tests with flying
118: colours since day 1.<p>
1.31 deraadt 119:
1.34 deraadt 120: Another facet of our security auditing process is its proactiveness.
1.45 deraadt 121: In most cases we have found that the determination of exploitability
122: is not an issue. During our ongoing auditing process we find many
123: bugs, and endeavor to fix them even though exploitability is not
124: proven. We fix the bug, and we move on to find other bugs to fix. We
125: have fixed many simple and obvious careless programming errors in code
126: and only months later discovered that the problems were in fact
127: exploitable. (Or, more likely someone on
1.197 jufi 128: <a href="http://online.securityfocus.com/archive/1">BUGTRAQ</a>
1.45 deraadt 129: would report that other operating systems were vulnerable to a `newly
130: discovered problem', and then it would be discovered that OpenBSD had
131: been fixed in a previous release). In other cases we have been saved
132: from full exploitability of complex step-by-step attacks because we
133: had fixed one of the intermediate steps. An example of where we
1.94 deraadt 134: managed such a success is the lpd advisory that Secure Networks put out.
135: <p>
1.29 deraadt 136:
1.288 matthieu 137: <a name="newtech"></a>
1.294 david 138: <li><h3><font color="#e00000">New Technologies</font></h3><p>
1.278 deraadt 139:
140: As we audit source code, we often invent new ways of solving problems.
141: Sometimes these ideas have been used before in some random application
142: written somewhere, but perhaps not taken to the degree that we do.
143: <p>
144:
145: <ul>
146: <li>strlcpy() and strlcat()
147: <li>Memory protection purify
148: <ul>
149: <li>W^X
150: <li>.rodata segment
151: <li>Guard pages
152: <li>Randomized malloc()
153: <li>Randomized mmap()
154: <li>atexit() and stdio protection
155: </ul>
1.295 otto 156: <li>Privilege separation
1.278 deraadt 157: <li>Privilege revocation
158: <li>Chroot jailing
159: <li>New uids
160: <li>ProPolice
161: <li>... and others
162: </ul>
163: <p>
164:
1.294 david 165: <li><h3><font color="#e00000">The Reward</font></h3><p>
1.106 deraadt 166:
1.45 deraadt 167: Our proactive auditing process has really paid off. Statements like
1.35 deraadt 168: ``This problem was fixed in OpenBSD about 6 months ago'' have become
1.45 deraadt 169: commonplace in security forums like
1.197 jufi 170: <a href="http://online.securityfocus.com/archive/1">BUGTRAQ</a>.<p>
1.35 deraadt 171:
1.45 deraadt 172: The most intense part of our security auditing happened immediately
1.80 espie 173: before the OpenBSD 2.0 release and during the 2.0->2.1 transition,
1.45 deraadt 174: over the last third of 1996 and first half of 1997. Thousands (yes,
175: thousands) of security issues were fixed rapidly over this year-long
176: period; bugs like the standard buffer overflows, protocol
177: implementation weaknesses, information gathering, and filesystem
178: races. Hence most of the security problems that we encountered were
179: fixed before our 2.1 release, and then a far smaller number needed
180: fixing for our 2.2 release. We do not find as many problems anymore,
181: it is simply a case of diminishing returns. Recently the security
182: problems we find and fix tend to be significantly more obscure or
183: complicated. Still we will persist for a number of reasons:<p>
1.36 deraadt 184:
1.35 deraadt 185: <ul>
1.45 deraadt 186: <li>Occasionally we find a simple problem we missed earlier. Doh!
1.35 deraadt 187: <li>Security is like an arms race; the best attackers will continue
1.45 deraadt 188: to search for more complicated exploits, so we will too.
189: <li>Finding and fixing subtle flaws in complicated software is
190: a lot of fun.
1.35 deraadt 191: </ul>
1.106 deraadt 192: <p>
1.15 deraadt 193:
1.14 deraadt 194: The auditing process is not over yet, and as you can see we continue
1.28 deraadt 195: to find and fix new security flaws.<p>
1.12 deraadt 196:
1.288 matthieu 197: <a name="default"></a>
1.294 david 198: <li><h3><font color="#e00000">"Secure by Default"</font></h3><p>
1.106 deraadt 199:
200: To ensure that novice users of OpenBSD do not need to become security
201: experts overnight (a viewpoint which other vendors seem to have), we
202: ship the operating system in a Secure by Default mode. All non-essential
203: services are disabled. As the user/administrator becomes more familiar
204: with the system, he will discover that he has to enable daemons and other
205: parts of the system. During the process of learning how to enable a new
206: service, the novice is more likely to learn of security considerations.<p>
207:
208: This is in stark contrast to the increasing number of systems that
209: ship with NFS, mountd, web servers, and various other services enabled
210: by default, creating instantaneous security problems for their users
211: within minutes after their first install.<p>
212:
1.288 matthieu 213: <a name="crypto"></a>
1.294 david 214: <li><h3><font color="#e00000">Cryptography</font></h3><p>
1.106 deraadt 215:
216: And of course, since the OpenBSD project is based in Canada, it is possible
217: for us to integrate cryptography. For more information, read the page
1.116 deraadt 218: outlining <a href=crypto.html>what we have done with cryptography</a>.</p>
1.106 deraadt 219:
1.294 david 220: <li><h3><font color="#e00000">Advisories</font></h3><p>
1.106 deraadt 221:
222: <li>
1.301 miod 223: <a name="36"></a>
224:
225: <h3><font color="#e00000">OpenBSD 3.6 Security Advisories</font></h3>
226: These are the OpenBSD 3.6 advisories -- all these problems are solved
227: in <a href=anoncvs.html>OpenBSD current</a> and the
228: <a href=stable.html>patch branch</a>.
229:
230: <p>
1.302 markus 231: <ul>
1.307 ! brad 232: <li><a href="errata.html#copy">Mar 16, 2005:
! 233: More stringent checking should be done in the copy(9)
! 234: functions to prevent their misuse.</a>
1.306 brad 235: <li><a href="errata.html#locore">Feb 28, 2005:
236: More stringent checking should be done in the copy(9)
237: functions to prevent their misuse.</a>
1.304 brad 238: <li><a href="errata.html#httpd">Jan 12, 2005:
239: httpd(8)'s mod_include module fails to properly validate
240: the length of user supplied tag strings prior to copying
1.305 brad 241: them to a local buffer, causing a buffer overflow.</a>
1.302 markus 242: <li><a href="errata.html#pfkey">Dec 14, 2004:
243: On systems running isakmpd(8) it is possible for a local
244: user to cause kernel memory corruption and system panic by
1.303 markus 245: setting ipsec(4) credentials on a socket.</a>
1.302 markus 246: </ul>
1.301 miod 247:
248: <p>
249: <li>
1.288 matthieu 250: <a name="35"></a>
1.279 deraadt 251:
1.294 david 252: <h3><font color="#e00000">OpenBSD 3.5 Security Advisories</font></h3>
1.279 deraadt 253: These are the OpenBSD 3.5 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>
1.307 ! brad 259: <li><a href="errata35.html#copy">Mar 16 28, 2005:
! 260: More stringent checking should be done in the copy(9)
! 261: functions to prevent their misuse.</a>
1.306 brad 262: <li><a href="errata35.html#locore">Feb 28, 2005:
263: More stringent checking should be done in the copy(9)
264: functions to prevent their misuse.</a>
1.304 brad 265: <li><a href="errata35.html#httpd3">Jan 12, 2005:
266: httpd(8)'s mod_include module fails to properly validate
267: the length of user supplied tag strings prior to copying
1.305 brad 268: them to a local buffer, causing a buffer overflow.</a>
1.302 markus 269: <li><a href="errata35.html#pfkey">Dec 14, 2004:
270: On systems running isakmpd(8) it is possible for a local
271: user to cause kernel memory corruption and system panic by
1.303 markus 272: setting ipsec(4) credentials on a socket.</a>
1.301 miod 273: <li><a href="errata35.html#radius">Sep 20, 2004:
1.299 millert 274: Radius-based authentication is vulnerable to spoofed replies.</a>
1.301 miod 275: <li><a href="errata35.html#xpm">Sep 16, 2004:
1.298 brad 276: The Xpm library has vulnerabilities when parsing malicious images.</a>
1.301 miod 277: <li><a href="errata35.html#httpd2"> Sep 10, 2004:
1.297 brad 278: httpd(8)'s mod_rewrite module can be made to write one zero byte in
279: an arbitrary memory position outside of a char array, causing a DoS
280: or possibly buffer overflows.</a>
1.301 miod 281: <li><a href="errata35.html#httpd"> Jun 12, 2004:
1.300 deraadt 282: Multiple vulnerabilities have been found in httpd(8) / mod_ssl.</a>
1.301 miod 283: <li><a href="errata35.html#isakmpd"> Jun 10, 2004:
1.291 hshoexer 284: isakmpd(8) still has issues with unauthorized SA deletion,
1.293 brad 285: an attacker can delete IPsec tunnels at will.</a>
1.301 miod 286: <li><a href="errata35.html#cvs3"> Jun 9, 2004:
1.290 millert 287: Multiple remote vulnerabilities have been found in the cvs(1)
288: server which can be used by CVS clients to crash or execute
1.293 brad 289: arbitrary code on the server.</a>
1.301 miod 290: <li><a href="errata35.html#kerberos"> May 30, 2004:
1.289 beck 291: kdc(8) performs inadequate checking of request fields, leading
292: to the possibility of principal impersonation from other
293: Kerberos realms if they are trusted with a cross-realm trust.</a>
1.301 miod 294: <li><a href="errata35.html#xdm"> May 26, 2004:
1.287 matthieu 295: xdm(1) ignores the requestPort resource and creates a
1.293 brad 296: listening socket regardless of the setting in xdm-config.</a>
1.301 miod 297: <li><a href="errata35.html#cvs2"> May 20, 2004:
1.286 otto 298: A buffer overflow in the cvs(1) server has been found,
299: which can be used by CVS clients to execute arbitrary code on
1.293 brad 300: the server.</a>
1.301 miod 301: <li><a href="errata35.html#procfs"> May 13, 2004:
1.282 tedu 302: Integer overflow problems were found in procfs, allowing
1.293 brad 303: reading of arbitrary kernel memory.</a>
1.301 miod 304: <li><a href="errata35.html#cvs"> May 5, 2004:
1.281 otto 305: Pathname validation problems have been found in cvs(1),
306: allowing clients and servers access to files outside the
1.293 brad 307: repository or local CVS tree.</a>
1.279 deraadt 308: </ul>
309:
310: <p>
1.301 miod 311: OpenBSD 3.4 and earlier releases are not supported anymore. The following
312: paragraphs only list advisories issued while they were maintained; these
313: releases are likely to be affected by the advisories for more recent releases.
314: <br>
315:
1.279 deraadt 316: <li>
1.288 matthieu 317: <a name="34"></a>
1.261 david 318:
1.294 david 319: <h3><font color="#e00000">OpenBSD 3.4 Security Advisories</font></h3>
1.261 david 320: These are the OpenBSD 3.4 advisories -- all these problems are solved
1.301 miod 321: in <a href="anoncvs.html">OpenBSD current</a>. The
322: <a href="stable.html">patch branch</a> for 3.4 is no longer being maintained,
323: you should update your machine.
1.261 david 324: <p>
325: <ul>
1.302 markus 326: <li><a href="errata34.html#pfkey">Dec 14, 2004:
327: On systems running isakmpd(8) it is possible for a local
328: user to cause kernel memory corruption and system panic by
1.303 markus 329: setting ipsec(4) credentials on a socket.</a>
1.298 brad 330: <li><a href="errata34.html#xpm">Sep 16, 2004:
331: The Xpm library has vulnerabilities when parsing malicious images.</a>
1.297 brad 332: <li><a href="errata34.html#httpd4"> Sep 10, 2004:
333: httpd(8)'s mod_rewrite module can be made to write one zero byte in
334: an arbitrary memory position outside of a char array, causing a DoS
335: or possibly buffer overflows.</a>
1.294 david 336: <li><a href="errata34.html#httpd3"> Jun 12, 2004:
1.300 deraadt 337: Multiple vulnerabilities have been found in httpd(8) / mod_ssl.</a>
1.294 david 338: <li><a href="errata34.html#isakmpd3"> Jun 10, 2004:
1.292 brad 339: isakmpd(8) still has issues with unauthorized SA deletion,
1.293 brad 340: an attacker can delete IPsec tunnels at will.</a>
1.294 david 341: <li><a href="errata34.html#cvs3"> Jun 9, 2004:
1.290 millert 342: Multiple remote vulnerabilities have been found in the cvs(1)
343: server which can be used by CVS clients to crash or execute
1.293 brad 344: arbitrary code on the server.</a>
1.294 david 345: <li><a href="errata34.html#kerberos"> May 30, 2004:
1.289 beck 346: kdc(8) performs inadequate checking of request fields, leading
347: to the possibility of principal impersonation from other
348: Kerberos realms if they are trusted with a cross-realm trust.</a>
1.294 david 349: <li><a href="errata34.html#cvs2"> May 20, 2004:
1.286 otto 350: A buffer overflow in the cvs(1) server has been found,
351: which can be used by CVS clients to execute arbitrary code on
352: the server.</a>
1.294 david 353: <li><a href="errata34.html#procfs"> May 13, 2004:
1.282 tedu 354: Integer overflow problems were found in procfs, allowing
355: reading of arbitrary kernel memory.</a>
1.294 david 356: <li><a href="errata34.html#cvs"> May 5, 2004:
1.281 otto 357: Pathname validation problems have been found in cvs(1),
358: allowing clients and servers access to files outside the
359: repository or local CVS tree.</a>
1.294 david 360: <li><a href="errata34.html#openssl"> March 17, 2004:
1.277 millert 361: A missing check for a NULL-pointer dereference may allow a
1.281 otto 362: remote attacker to crash applications using OpenSSL.</a>
1.294 david 363: <li><a href="errata34.html#isakmpd2"> March 17, 2004:
1.276 brad 364: Defects in the payload validation and processing functions of
365: isakmpd have been discovered. An attacker could send malformed
366: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.294 david 367: <li><a href="errata34.html#httpd2"> March 13, 2004:
1.275 brad 368: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
369: access module, using IP addresses without a netmask on big endian
370: 64-bit platforms causes the rules to fail to match.</a>
1.294 david 371: <li><a href="errata34.html#ip6"> February 8, 2004:
1.272 dhartmei 372: An IPv6 MTU handling problem exists that could be used by an
373: attacker to cause a denial of service attack.</a>
1.294 david 374: <li><a href="errata34.html#sysvshm"> February 5, 2004:
1.271 millert 375: A reference counting bug in shmat(2) could be used to write to
376: kernel memory under certain circumstances.</a>
1.294 david 377: <li><a href="errata34.html#isakmpd">January 13, 2004:
1.266 brad 378: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 379: by Thomas Walpuski.</a>
1.294 david 380: <li><a href="errata34.html#ibcs2">November 17, 2003:
1.264 henning 381: It may be possible for a local user to overrun the stack in
382: compat_ibcs2(8) and cause a kernel panic.</a>
1.294 david 383: <li><a href="errata34.html#asn1">November 1, 2003:
1.262 margarid 384: The use of certain ASN.1 encodings or malformed public keys may
385: allow an attacker to mount a denial of service attack against
386: applications linked with ssl(3).</a>
1.261 david 387: </ul>
388:
389: <li>
1.288 matthieu 390: <a name="33"></a>
1.246 deraadt 391:
1.294 david 392: <h3><font color="#e00000">OpenBSD 3.3 Security Advisories</font></h3>
1.246 deraadt 393: These are the OpenBSD 3.3 advisories -- all these problems are solved
1.294 david 394: in <a href="anoncvs.html">OpenBSD current</a>. The
395: <a href="stable.html">patch branch</a> for 3.3 is no longer being maintained,
1.284 otto 396: you should update your machine.
1.246 deraadt 397: <p>
398: <ul>
1.294 david 399: <li><a href="errata33.html#cvs"> May 5, 2004:
1.281 otto 400: Pathname validation problems have been found in cvs(1),
401: allowing clients and servers access to files outside the
402: repository or local CVS tree.</a>
1.294 david 403: <li><a href="errata33.html#openssl"> March 17, 2004:
1.277 millert 404: A missing check for a NULL-pointer dereference may allow a
1.281 otto 405: remote attacker to crash applications using OpenSSL.</a>
1.294 david 406: <li><a href="errata33.html#isakmpd2"> March 17, 2004:
1.276 brad 407: Defects in the payload validation and processing functions of
408: isakmpd have been discovered. An attacker could send malformed
409: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.294 david 410: <li><a href="errata33.html#httpd2"> March 13, 2004:
1.275 brad 411: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
412: access module, using IP addresses without a netmask on big endian
413: 64-bit platforms causes the rules to fail to match.</a>
1.294 david 414: <li><a href="errata33.html#ip6"> February 8, 2004:
1.275 brad 415: An IPv6 MTU handling problem exists that could be used by an
416: attacker to cause a denial of service attack.</a>
1.294 david 417: <li><a href="errata33.html#sysvshm"> February 5, 2004:
1.271 millert 418: A reference counting bug in shmat(2) could be used to write to
419: kernel memory under certain circumstances.</a>
1.294 david 420: <li><a href="errata33.html#isakmpd">January 15, 2004:
1.268 brad 421: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 422: by Thomas Walpuski.</a>
1.294 david 423: <li><a href="errata33.html#ibcs2">November 17, 2003:
1.264 henning 424: It may be possible for a local user to execute arbitrary code
425: resulting in escalation of privileges due to a stack overrun
426: in compat_ibcs2(8).</a>
1.294 david 427: <li><a href="errata33.html#asn1">October 1, 2003:
1.257 millert 428: The use of certain ASN.1 encodings or malformed public keys may
429: allow an attacker to mount a denial of service attack against
430: applications linked with ssl(3).</a>
1.294 david 431: <li><a href="errata33.html#pfnorm">September 24, 2003:
1.258 beck 432: Access of freed memory in pf(4) could be used to
1.260 margarid 433: remotely panic a machine using scrub rules.</a>
1.294 david 434: <li><a href="errata33.html#sendmail">September 17, 2003:
1.256 millert 435: A buffer overflow in the address parsing in
436: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 437: <li><a href="errata33.html#sshbuffer">September 16, 2003:
1.255 millert 438: OpenSSH versions prior to 3.7 contains a buffer management error
439: that is potentially exploitable.</a>
1.294 david 440: <li><a href="errata33.html#sysvsem">September 10, 2003:
1.254 millert 441: Root may be able to reduce the security level by taking advantage of
442: an integer overflow when the semaphore limits are made very large.</a>
1.294 david 443: <li><a href="errata33.html#semget">August 20, 2003:
1.252 millert 444: An improper bounds check in the kernel may allow a local user
445: to panic the kernel.</a>
1.294 david 446: <li><a href="errata33.html#realpath">August 4, 2003:
1.249 millert 447: An off-by-one error exists in the C library function realpath(3)
448: may allow an attacker to gain escalated privileges.</a>
1.246 deraadt 449: </ul>
450:
1.265 miod 451:
1.247 david 452: <p>
1.246 deraadt 453: <li>
1.288 matthieu 454: <a name="32"></a>
1.224 deraadt 455:
1.294 david 456: <h3><font color="#e00000">OpenBSD 3.2 Security Advisories</font></h3>
1.224 deraadt 457: These are the OpenBSD 3.2 advisories -- all these problems are solved
1.294 david 458: in <a href="anoncvs.html">OpenBSD current</a>. The
459: <a href="stable.html">patch branch</a> for 3.2 is no longer being maintained,
1.265 miod 460: you should update your machine.
1.224 deraadt 461: <p>
462: <ul>
1.294 david 463: <li><a href="errata32.html#asn1">October 1, 2003:
1.257 millert 464: The use of certain ASN.1 encodings or malformed public keys may
465: allow an attacker to mount a denial of service attack against
466: applications linked with ssl(3). This does not affect OpenSSH.</a>
1.294 david 467: <li><a href="errata32.html#pfnorm">September 24, 2003:
1.258 beck 468: Access of freed memory in pf(4) could be used to
1.260 margarid 469: remotely panic a machine using scrub rules.</a>
1.294 david 470: <li><a href="errata32.html#sendmail4">September 17, 2003:
1.256 millert 471: A buffer overflow in the address parsing in
472: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 473: <li><a href="errata32.html#sshbuffer">September 16, 2003:
1.255 millert 474: OpenSSH versions prior to 3.7 contains a buffer management error
475: that is potentially exploitable.</a>
1.294 david 476: <li><a href="errata32.html#sendmail3">August 25, 2003:
1.253 brad 477: Fix for a potential security issue in
478: sendmail(8) with respect to DNS maps.</a>
1.294 david 479: <li><a href="errata32.html#realpath">August 4, 2003:
1.249 millert 480: An off-by-one error exists in the C library function realpath(3)
481: may allow an attacker to gain escalated privileges.</a>
1.294 david 482: <li><a href="errata32.html#sendmail2">March 31, 2003:
1.244 miod 483: A buffer overflow in the address parsing in
484: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 485: <li><a href="errata32.html#kerberos">March 24, 2003:
1.242 millert 486: A cryptographic weaknesses in the Kerberos v4 protocol can be
487: exploited on Kerberos v5 as well.</a>
1.294 david 488: <li><a href="errata32.html#kpr">March 19, 2003:
1.241 jufi 489: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 490: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.294 david 491: <li><a href="errata32.html#blinding">March 18, 2003:
1.239 miod 492: Various SSL and TLS operations in OpenSSL are vulnerable to
493: timing attacks.</a>
1.294 david 494: <li><a href="errata32.html#lprm">March 5, 2003:
1.238 millert 495: A buffer overflow in lprm(1) may allow an attacker to elevate
496: privileges to user daemon.</a>.
1.294 david 497: <li><a href="errata32.html#sendmail">March 3, 2003:
1.237 miod 498: A buffer overflow in the envelope comments processing in
499: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 500: <li><a href="errata32.html#httpd">February 25, 2003:
1.236 margarid 501: httpd(8) leaks file inode numbers via ETag header as well as
502: child PIDs in multipart MIME boundary generation. This could
503: lead, for example, to NFS exploitation because it uses inode
504: numbers as part of the file handle.</a>
1.294 david 505: <li><a href="errata32.html#ssl">February 22, 2003:
1.234 margarid 506: In ssl(8) an information leak can occur via timing by performing
507: a MAC computation even if incorrect block cipher padding has
508: been found, this is a countermeasure. Also, check for negative
509: sizes, in allocation routines.</a>
1.294 david 510: <li><a href="errata32.html#cvs">January 20, 2003:
1.232 millert 511: A double free exists in cvs(1) that could lead to privilege
512: escalation for cvs configurations where the cvs command is
1.233 margarid 513: run as a privileged user.</a>
1.294 david 514: <li><a href="errata32.html#named">November 14, 2002:
1.230 millert 515: A buffer overflow exists in named(8) that could lead to a
516: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 517: <li><a href="errata32.html#pool">November 6, 2002:
1.233 margarid 518: A logic error in the pool kernel memory allocator could cause
519: memory corruption in low-memory situations, causing the system
520: to crash.</a>
1.294 david 521: <li><a href="errata32.html#smrsh">November 6, 2002:
1.229 miod 522: An attacker can bypass smrsh(8)'s restrictions and execute
523: arbitrary commands with the privileges of his own account.</a>
1.294 david 524: <li><a href="errata32.html#pfbridge">November 6, 2002:
1.233 margarid 525: Network bridges running pf with scrubbing enabled could cause
526: mbuf corruption, causing the system to crash.</a>
1.294 david 527: <li><a href="errata32.html#kadmin">October 21, 2002:
1.228 miod 528: A buffer overflow can occur in the kadmind(8) daemon, leading
529: to possible remote crash or exploit.</a>
1.224 deraadt 530: </ul>
531:
1.227 miod 532: <p>
533: <li>
1.288 matthieu 534: <a name="31"></a>
1.203 deraadt 535:
1.294 david 536: <h3><font color="#e00000">OpenBSD 3.1 Security Advisories</font></h3>
1.203 deraadt 537: These are the OpenBSD 3.1 advisories -- all these problems are solved
1.294 david 538: in <a href="anoncvs.html">OpenBSD current</a>. The
539: <a href="stable.html">patch branch</a> for 3.1 is no longer being maintained,
1.258 beck 540: you should update your machine.
1.203 deraadt 541:
542: <p>
543: <ul>
1.294 david 544: <li><a href="errata31.html#sendmail2">March 31, 2003:
1.244 miod 545: A buffer overflow in the address parsing in
546: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 547: <li><a href="errata31.html#kerberos">March 24, 2003:
1.242 millert 548: A cryptographic weaknesses in the Kerberos v4 protocol can be
549: exploited on Kerberos v5 as well.</a>
1.294 david 550: <li><a href="errata31.html#kpr">March 19, 2003:
1.241 jufi 551: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 552: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.294 david 553: <li><a href="errata31.html#blinding">March 18, 2003:
1.239 miod 554: Various SSL and TLS operations in OpenSSL are vulnerable to
555: timing attacks.</a>
1.294 david 556: <li><a href="errata31.html#lprm">March 4, 2003:
1.238 millert 557: A buffer overflow in lprm(1) may allow an attacker to gain
558: root privileges.</a>
1.294 david 559: <li><a href="errata31.html#sendmail">March 3, 2003:
1.237 miod 560: A buffer overflow in the envelope comments processing in
561: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 562: <li><a href="errata31.html#ssl2">February 23, 2003:
1.235 miod 563: In ssl(8) an information leak can occur via timing by performing
564: a MAC computation even if incorrect block cipher padding has
565: been found, this is a countermeasure. Also, check for negative
566: sizes, in allocation routines.</a>
1.294 david 567: <li><a href="errata31.html#cvs">January 20, 2003:
1.232 millert 568: A double free exists in cvs(1) that could lead to privilege
569: escalation for cvs configurations where the cvs command is
1.294 david 570: run as a privileged user</a>.
571: <li><a href="errata31.html#named">November 14, 2002:
1.230 millert 572: A buffer overflow exists in named(8) that could lead to a
573: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 574: <li><a href="errata31.html#kernresource">November 6, 2002:
1.229 miod 575: Incorrect argument checking in the getitimer(2) system call
576: may allow an attacker to crash the system.</a>
1.294 david 577: <li><a href="errata31.html#smrsh">November 6, 2002:
1.229 miod 578: An attacker can bypass smrsh(8)'s restrictions and execute
579: arbitrary commands with the privileges of his own account.</a>
1.294 david 580: <li><a href="errata31.html#kadmin">October 21, 2002:
1.226 miod 581: A buffer overflow can occur in the kadmind(8) daemon, leading
582: to possible remote crash or exploit.</a>
1.294 david 583: <li><a href="errata31.html#kerntime">October 2, 2002:
1.222 jason 584: Incorrect argument checking in the setitimer(2) system call
585: may allow an attacker to write to kernel memory.</a>
1.294 david 586: <li><a href="errata31.html#scarg">August 11, 2002:
1.221 provos 587: An insufficient boundary check in the select system call
1.220 miod 588: allows an attacker to overwrite kernel memory and execute arbitrary code
589: in kernel context.</a>
1.294 david 590: <li><a href="errata31.html#ssl">July 30, 2002:
1.218 miod 591: Several remote buffer overflows can occur in the SSL2 server and SSL3
592: client of the ssl(8) library, as in the ASN.1 parser code in the
593: crypto(3) library, all of them being potentially remotely
594: exploitable.</a>
1.294 david 595: <li><a href="errata31.html#xdr">July 29, 2002:
1.218 miod 596: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
597: possible remote crash.</a>
1.294 david 598: <li><a href="errata31.html#pppd">July 29, 2002:
1.218 miod 599: A race condition exists in the pppd(8) daemon which may cause it to
600: alter the file permissions of an arbitrary file.</a>
1.294 david 601: <li><a href="errata31.html#isakmpd">July 5, 2002:
1.218 miod 602: Receiving IKE payloads out of sequence can cause isakmpd(8) to
603: crash.</a>
1.294 david 604: <li><a href="errata31.html#ktrace">June 27, 2002:
1.215 miod 605: The kernel would let any user ktrace set[ug]id processes.</a>
1.294 david 606: <li><a href="errata31.html#modssl">June 26, 2002:
1.213 miod 607: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 608: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.294 david 609: <li><a href="errata31.html#resolver">June 25, 2002:
1.212 millert 610: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 611: <li><a href="errata31.html#sshd">June 24, 2002:
1.216 deraadt 612: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 613: input validation error that can result in an integer overflow and
614: privilege escalation.</a>
1.294 david 615: <li><a href="errata31.html#httpd">June 19, 2002:
1.211 miod 616: A buffer overflow can occur during the interpretation of chunked
617: encoding in httpd(8), leading to possible remote crash.</a>
1.294 david 618: <li><a href="errata31.html#sshbsdauth">May 22, 2002:
1.209 markus 619: Under certain conditions, on systems using YP with netgroups
620: in the password database, it is possible that sshd(8) does
621: ACL checks for the requested user name but uses the password
622: database entry of a different user for authentication. This
623: means that denied users might authenticate successfully
624: while permitted users could be locked out.</a>
1.294 david 625: <li><a href="errata31.html#fdalloc2">May 8, 2002:
1.208 millert 626: A race condition exists that could defeat the kernel's
627: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 628: <li><a href="errata31.html#sudo">April 25, 2002:
1.205 millert 629: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 630: <li><a href="errata31.html#sshafs">April 22, 2002:
1.205 millert 631: A local user can gain super-user privileges due to a buffer
632: overflow in sshd(8) if AFS has been configured on the system
633: or if KerberosTgtPassing or AFSTokenPassing has been enabled
634: in the sshd_config file.</a>
1.203 deraadt 635: </ul>
636:
1.235 miod 637: <p>
1.203 deraadt 638: <li>
1.288 matthieu 639: <a name="30"></a>
1.187 deraadt 640:
1.294 david 641: <h3><font color="#e00000">OpenBSD 3.0 Security Advisories</font></h3>
1.187 deraadt 642: These are the OpenBSD 3.0 advisories -- all these problems are solved
1.294 david 643: in <a href="anoncvs.html">OpenBSD current</a>. The
644: <a href="stable.html">patch branch</a> for 3.0 is no longer being maintained,
1.258 beck 645: you should update your machine.
1.187 deraadt 646:
647: <p>
648: <ul>
1.294 david 649: <li><a href="errata30.html#named">November 14, 2002:
1.230 millert 650: A buffer overflow exists in named(8) that could lead to a
651: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 652: <li><a href="errata30.html#kernresource">November 6, 2002:
1.229 miod 653: Incorrect argument checking in the getitimer(2) system call
654: may allow an attacker to crash the system.</a>
1.294 david 655: <li><a href="errata30.html#smrsh">November 6, 2002:
1.229 miod 656: An attacker can bypass smrsh(8)'s restrictions and execute
657: arbitrary commands with the privileges of his own account.</a>
1.294 david 658: <li><a href="errata30.html#kadmin">October 21, 2002:
1.226 miod 659: A buffer overflow can occur in the kadmind(8) daemon, leading
660: to possible remote crash or exploit.</a>
1.294 david 661: <li><a href="errata30.html#kerntime">October 7, 2002:
1.223 miod 662: Incorrect argument checking in the setitimer(2) system call
663: may allow an attacker to write to kernel memory.</a>
1.294 david 664: <li><a href="errata30.html#scarg">August 11, 2002:
1.220 miod 665: An insufficient boundary check in the select and poll system calls
666: allows an attacker to overwrite kernel memory and execute arbitrary code
667: in kernel context.</a>
1.294 david 668: <li><a href="errata30.html#ssl">July 30, 2002:
1.218 miod 669: Several remote buffer overflows can occur in the SSL2 server and SSL3
670: client of the ssl(8) library, as in the ASN.1 parser code in the
671: crypto(3) library, all of them being potentially remotely
672: exploitable.</a>
1.294 david 673: <li><a href="errata30.html#xdr">July 29, 2002:
1.218 miod 674: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
675: possible remote crash.</a>
1.294 david 676: <li><a href="errata30.html#pppd">July 29, 2002:
1.218 miod 677: A race condition exists in the pppd(8) daemon which may cause it to
678: alter the file permissions of an arbitrary file.</a>
1.294 david 679: <li><a href="errata30.html#isakmpd2">July 5, 2002:
1.218 miod 680: Receiving IKE payloads out of sequence can cause isakmpd(8) to
681: crash.</a>
1.294 david 682: <li><a href="errata30.html#ktrace">June 27, 2002:
1.215 miod 683: The kernel would let any user ktrace set[ug]id processes.</a>
1.294 david 684: <li><a href="errata30.html#resolver">June 25, 2002:
1.212 millert 685: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 686: <li><a href="errata30.html#sshdauth">June 24, 2002:
1.216 deraadt 687: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 688: input validation error that can result in an integer overflow and
689: privilege escalation.</a>
1.294 david 690: <li><a href="errata30.html#modssl">June 24, 2002:
1.213 miod 691: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 692: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.294 david 693: <li><a href="errata30.html#httpd">June 19, 2002:
1.213 miod 694: A buffer overflow can occur during the interpretation of chunked
695: encoding in httpd(8), leading to possible remote crash.</a>
1.294 david 696: <li><a href="errata30.html#fdalloc2">May 8, 2002:
1.208 millert 697: A race condition exists that could defeat the kernel's
698: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 699: <li><a href="errata30.html#sudo2">April 25, 2002:
1.205 millert 700: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 701: <li><a href="errata30.html#sshafs">April 22, 2002:
1.205 millert 702: A local user can gain super-user privileges due to a buffer
703: overflow in sshd(8) if AFS has been configured on the system
704: or if KerberosTgtPassing or AFSTokenPassing has been enabled
705: in the sshd_config file.</a>
1.294 david 706: <li><a href="errata30.html#mail">April 11, 2002:
1.202 millert 707: The mail(1) was interpreting tilde escapes even when invoked
708: in non-interactive mode. As mail(1) is called as root from cron,
709: this can lead to a local root compromise.</a>
1.294 david 710: <li><a href="errata30.html#approval">March 19, 2002:
1.201 millert 711: Under certain conditions, on systems using YP with netgroups in
712: the password database, it is possible for the rexecd(8) and rshd(8)
713: daemons to execute a shell from a password database entry for a
714: different user. Similarly, atrun(8) may change to the wrong
715: home directory when running jobs.</a>
1.294 david 716: <li><a href="errata30.html#zlib">March 13, 2002:
1.200 millert 717: A potential double free() exists in the zlib library;
718: this is not exploitable on OpenBSD.
719: The kernel also contains a copy of zlib; it is not
720: currently known if the kernel zlib is exploitable.</a>
1.294 david 721: <li><a href="errata30.html#openssh">March 8, 2002:
1.198 millert 722: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 723: may allow a local user to gain super-user privileges.</a>
1.294 david 724: <li><a href="errata30.html#ptrace">January 21, 2002:
1.192 jason 725: A race condition between the ptrace(2) and execve(2) system calls
726: allows an attacker to modify the memory contents of suid/sgid
727: processes which could lead to compromise of the super-user account.</a>
1.294 david 728: <li><a href="errata30.html#sudo">January 17, 2002:
1.191 millert 729: There is a security hole in sudo(8) that can be exploited
730: when the Postfix sendmail replacement is installed that may
731: allow an attacker on the local host to gain root privileges.</a>
1.294 david 732: <li><a href="errata30.html#lpd">November 28, 2001:
1.189 millert 733: An attacker can trick a machine running the lpd daemon into
734: creating new files in the root directory from a machine with
735: remote line printer access.</a>
1.294 david 736: <li><a href="errata30.html#vi.recover">November 13, 2001:
1.188 millert 737: The vi.recover script can be abused in such a way as
738: to cause arbitrary zero-length files to be removed.</a>
1.294 david 739: <li><a href="errata30.html#pf">November 13, 2001:
1.190 mpech 740: pf(4) was incapable of dealing with certain ipv6 icmp packets,
741: resulting in a crash.</a>
1.294 david 742: <li><a href="errata30.html#sshd">November 12, 2001:
1.190 mpech 743: A security hole that may allow an attacker to partially authenticate
744: if -- and only if -- the administrator has enabled KerberosV.</a>
1.187 deraadt 745: </ul>
746:
747: <p>
748: <li>
1.288 matthieu 749: <a name="29"></a>
1.173 deraadt 750:
1.294 david 751: <h3><font color="#e00000">OpenBSD 2.9 Security Advisories</font></h3>
1.173 deraadt 752: These are the OpenBSD 2.9 advisories -- all these problems are solved
1.294 david 753: in <a href="anoncvs.html">OpenBSD current</a>. The
754: <a href="stable.html">patch branch</a>. for 2.9 is no longer being maintained,
1.258 beck 755: you should update your machine.
756:
1.173 deraadt 757:
758: <p>
759: <ul>
1.294 david 760: <li><a href="errata29.html#resolver">June 25, 2002:
1.212 millert 761: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 762: <li><a href="errata29.html#fdalloc2">May 8, 2002:
1.208 millert 763: A race condition exists that could defeat the kernel's
764: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 765: <li><a href="errata29.html#sudo2">April 25, 2002:
1.207 millert 766: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 767: <li><a href="errata29.html#sshafs">April 22, 2002:
1.206 millert 768: A local user can gain super-user privileges due to a buffer
769: overflow in sshd(8) if AFS has been configured on the system
770: or if KerberosTgtPassing or AFSTokenPassing has been enabled
771: in the sshd_config file.</a>
1.294 david 772: <li><a href="errata29.html#mail">April 11, 2002:
1.202 millert 773: The mail(1) was interpreting tilde escapes even when invoked
774: in non-interactive mode. As mail(1) is called as root from cron,
775: this can lead to a local root compromise.</a>
1.294 david 776: <li><a href="errata29.html#zlib">March 13, 2002:
1.200 millert 777: A potential double free() exists in the zlib library;
778: this is not exploitable on OpenBSD.
779: The kernel also contains a copy of zlib; it is not
780: currently known if the kernel zlib is exploitable.</a>
1.294 david 781: <li><a href="errata29.html#openssh">March 8, 2002:
1.198 millert 782: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 783: may allow a local user to gain super-user privileges.</a>
1.294 david 784: <li><a href="errata29.html#ptrace">January 21, 2002:
1.198 millert 785: A race condition between the ptrace(2) and execve(2) system calls
786: allows an attacker to modify the memory contents of suid/sgid
787: processes which could lead to compromise of the super-user account.</a>
1.294 david 788: <li><a href="errata29.html#sudo">January 17, 2002:
1.191 millert 789: There is a security hole in sudo(8) that can be exploited
790: when the Postfix sendmail replacement is installed that may
791: allow an attacker on the local host to gain root privileges.</a>
1.294 david 792: <li><a href="errata29.html#lpd2">November 28, 2001:
1.189 millert 793: An attacker can trick a machine running the lpd daemon into
794: creating new files in the root directory from a machine with
795: remote line printer access.</a>
1.294 david 796: <li><a href="errata29.html#vi.recover">November 13, 2001:
1.190 mpech 797: The vi.recover script can be abused in such a way as
798: to cause arbitrary zero-length files to be removed.</a>
1.294 david 799: <li><a href="errata29.html#uucp">September 11, 2001:
1.184 millert 800: A security hole exists in uuxqt(8) that may allow an
801: attacker to gain root privileges.</a>
1.294 david 802: <li><a href="errata29.html#lpd">August 29, 2001:
1.183 millert 803: A security hole exists in lpd(8) that may allow an
804: attacker to gain root privileges if lpd is running.</a>
1.294 david 805: <li><a href="errata29.html#sendmail2">August 21, 2001:
1.181 millert 806: A security hole exists in sendmail(8) that may allow an
807: attacker on the local host to gain root privileges.</a>
1.294 david 808: <li><a href="errata29.html#nfs">July 30, 2001:
1.180 jason 809: A kernel buffer overflow in the NFS code can be used to execute
810: arbitrary code by users with mount privileges (only root by
1.181 millert 811: default).</a>
1.294 david 812: <li><a href="errata29.html#kernexec">June 15, 2001:
1.178 aaron 813: A race condition in the kernel can lead to local root compromise.</a>
1.294 david 814: <li><a href="errata29.html#sshcookie">June 12, 2001:
1.177 markus 815: sshd(8) allows users to delete arbitrary files named "cookies"
816: if X11 forwarding is enabled. X11 forwarding is disabled
817: by default.</a>
1.294 david 818: <li><a href="errata29.html#fts">May 30, 2001:
1.176 millert 819: Programs using the fts routines can be tricked into changing
820: into the wrong directory.</a>
1.294 david 821: <li><a href="errata29.html#sendmail">May 29, 2001:
1.174 millert 822: Sendmail signal handlers contain unsafe code,
823: leading to numerous race conditions.</a>
1.173 deraadt 824: </ul>
825:
826: <p>
827: <li>
1.288 matthieu 828: <a name="28"></a>
1.152 deraadt 829:
1.294 david 830: <h3><font color="#e00000">OpenBSD 2.8 Security Advisories</font></h3>
1.152 deraadt 831: These are the OpenBSD 2.8 advisories -- all these problems are solved
1.294 david 832: in <a href="anoncvs.html">OpenBSD current</a>. The
833: <a href="stable.html">patch branch</a>. for 2.8 is no longer being maintained,
1.258 beck 834: you should update your machine.
835:
1.152 deraadt 836:
837: <p>
838: <ul>
1.294 david 839: <li><a href="errata28.html#uucp">September 11, 2001:
1.184 millert 840: A security hole exists in uuxqt(8) that may allow an
841: attacker to gain root privileges.</a>
1.294 david 842: <li><a href="errata28.html#lpd">August 29, 2001:
1.183 millert 843: A security hole exists in lpd(8) that may allow an
844: attacker to gain root privileges if lpd is running.</a>
1.294 david 845: <li><a href="errata28.html#sendmail2">August 21, 2001:
1.181 millert 846: A security hole exists in sendmail(8) that may allow an
847: attacker on the local host to gain root privileges.</a>
1.294 david 848: <li><a href="errata28.html#kernexec">June 15, 2001:
1.178 aaron 849: A race condition in the kernel can lead to local root compromise.</a>
1.294 david 850: <li><a href="errata28.html#fts">May 30, 2001:
1.176 millert 851: Programs using the fts routines can be tricked into changing
852: into the wrong directory.</a>
1.294 david 853: <li><a href="errata28.html#sendmail">May 29, 2001:
1.175 millert 854: Sendmail signal handlers contain unsafe code,
855: leading to numerous race conditions.</a>
1.294 david 856: <li><a href="errata28.html#ipf_frag">Apr 23, 2001:
1.231 mickey 857: IPF contains a serious bug with its handling of fragment caching.</a>
1.294 david 858: <li><a href="errata28.html#glob_limit">Apr 23, 2001:
1.172 ericj 859: ftpd(8) contains a potential DoS relating to glob(3).</a>
1.294 david 860: <li><a href="errata28.html#glob">Apr 10, 2001:
1.170 ericj 861: The glob(3) library call contains multiple buffer overflows.</a>
1.294 david 862: <li><a href="errata28.html#readline">Mar 18, 2001:
1.169 millert 863: The readline library creates history files with permissive modes based on the user's umask.</a>
1.294 david 864: <li><a href="errata28.html#ipsec_ah">Mar 2, 2001:
1.167 ericj 865: Insufficient checks in the IPSEC AH IPv4 option handling code can lead to a buffer overrun in the kernel.</a>
1.294 david 866: <li><a href="errata28.html#userldt">Mar 2, 2001:
1.168 horacio 867: The <b>USER_LDT</b> kernel option allows an attacker to gain access to privileged areas of kernel memory.</a>
1.294 david 868: <li><a href="errata28.html#sudo">Feb 22, 2001:
1.171 millert 869: a non-exploitable buffer overflow was fixed in sudo(8).</a>
1.294 david 870: <li><a href="errata28.html#named">Jan 29, 2001:
1.163 jason 871: merge named(8) with ISC BIND 4.9.8-REL, which fixes some buffer vulnerabilities.</a>
1.294 david 872: <li><a href="errata28.html#rnd">Jan 22, 2001:
1.162 jason 873: rnd(4) did not use all of its input when written to.</a>
1.294 david 874: <li><a href="errata28.html#xlock">Dec 22, 2000:
1.159 ericj 875: xlock(1)'s authentication was re-done to authenticate via a named pipe. (patch and new xlock binaries included).</a>
1.294 david 876: <li><a href="errata28.html#procfs">Dec 18, 2000:
1.157 ericj 877: Procfs contains numerous overflows. Procfs is not used by default in OpenBSD. (patch included).</a>
1.294 david 878: <li><a href="errata28.html#kerberos2">Dec 10, 2000:
1.156 deraadt 879: Another problem exists in KerberosIV libraries (patch included).</a>
1.294 david 880: <li><a href="errata28.html#kerberos">Dec 7, 2000:
1.155 deraadt 881: A set of problems in KerberosIV exist (patch included).</a>
1.294 david 882: <li><a href="errata28.html#ftpd">Dec 4, 2000:
1.154 millert 883: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.152 deraadt 884: </ul>
885:
886: <p>
887: <li>
1.288 matthieu 888: <a name="27"></a>
1.124 deraadt 889:
1.294 david 890: <h3><font color="#e00000">OpenBSD 2.7 Security Advisories</font></h3>
1.124 deraadt 891: These are the OpenBSD 2.7 advisories -- all these problems are solved
1.294 david 892: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.124 deraadt 893: OpenBSD 2.6 advisories listed below are fixed in OpenBSD 2.7.
894:
895: <p>
896: <ul>
1.294 david 897: <li><a href="errata27.html#readline">Mar 18, 2001:
1.169 millert 898: The readline library creates history files with permissive modes based on the user's umask.</a>
1.294 david 899: <li><a href="errata27.html#sudo">Feb 22, 2001:
1.169 millert 900: a buffer overflow was fixed in sudo(8).</a>
1.294 david 901: <li><a href="errata27.html#ftpd">Dec 4, 2000:
1.154 millert 902: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.294 david 903: <li><a href="errata27.html#sshforwarding">Nov 10, 2000:
1.152 deraadt 904: Hostile servers can force OpenSSH clients to do agent or X11 forwarding.
905: (patch included)</a>
1.294 david 906: <li><a href="errata27.html#xtrans">Oct 26, 2000:
1.151 matthieu 907: X11 libraries have 2 potential overflows in xtrans code.
908: (patch included)</a>
1.294 david 909: <li><a href="errata27.html#httpd">Oct 18, 2000:
1.150 beck 910: Apache mod_rewrite and mod_vhost_alias modules could expose files
911: on the server in certain configurations if used.
912: (patch included)</a>
1.294 david 913: <li><a href="errata27.html#telnetd">Oct 10, 2000:
1.149 millert 914: The telnet daemon does not strip out the TERMINFO, TERMINFO_DIRS,
915: TERMPATH and TERMCAP environment variables as it should.
916: (patch included)</a>
1.294 david 917: <li><a href="errata27.html#format_strings">Oct 6, 2000:
1.148 millert 918: There are printf-style format string bugs in several privileged
919: programs. (patch included)</a>
1.294 david 920: <li><a href="errata27.html#curses">Oct 6, 2000:
1.147 millert 921: libcurses honored terminal descriptions in the $HOME/.terminfo
922: directory as well as in the TERMCAP environment variable for
923: setuid and setgid applications.
1.146 deraadt 924: (patch included)</a>
1.294 david 925: <li><a href="errata27.html#talkd">Oct 6, 2000:
1.146 deraadt 926: A format string vulnerability exists in talkd(8).
927: (patch included)</a>
1.294 david 928: <li><a href="errata27.html#pw_error">Oct 3, 2000:
1.145 aaron 929: A format string vulnerability exists in the pw_error() function of the
930: libutil library, yielding localhost root through chpass(1).
931: (patch included)</a>
1.294 david 932: <li><a href="errata27.html#ipsec">Sep 18, 2000:
1.144 jason 933: Bad ESP/AH packets could cause a crash under certain conditions.
934: (patch included)</a>
1.294 david 935: <li><a href="errata27.html#xlock">Aug 16, 2000:
1.141 deraadt 936: A format string vulnerability (localhost root) exists in xlock(1).
937: (patch included)</a>
1.294 david 938: <li><a href="errata27.html#X11_libs">July 14, 2000:
1.139 deraadt 939: Various bugs found in X11 libraries have various side effects, almost
940: completely denial of service in OpenBSD.
941: (patch included)</a>
1.294 david 942: <li><a href="errata27.html#ftpd">July 5, 2000:
1.136 deraadt 943: Just like pretty much all the other unix ftp daemons
944: on the planet, ftpd had a remote root hole in it.
945: Luckily, ftpd was not enabled by default.
1.137 deraadt 946: The problem exists if anonymous ftp is enabled.
1.136 deraadt 947: (patch included)</a>
1.294 david 948: <li><a href="errata27.html#mopd">July 5, 2000:
1.136 deraadt 949: Mopd, very rarely used, contained some buffer overflows.
950: (patch included)</a>
1.294 david 951: <li><a href="errata27.html#libedit">June 28, 2000:
1.135 deraadt 952: libedit would check for a <b>.editrc</b> file in the current
953: directory. Not known to be a real security issue, but a patch
954: is available anyways.
955: (patch included)</a>
1.294 david 956: <li><a href="errata27.html#dhclient">June 24, 2000:
1.134 deraadt 957: A serious bug in dhclient(8) could allow strings from a
958: malicious dhcp server to be executed in the shell as root.
959: (patch included)</a>
1.294 david 960: <li><a href="errata27.html#isakmpd">June 9, 2000:
1.133 deraadt 961: A serious bug in isakmpd(8) policy handling wherein
962: policy verification could be completely bypassed in isakmpd.
963: (patch included)</a>
1.294 david 964: <li><a href="errata27.html#uselogin">June 6, 2000:
1.132 deraadt 965: The non-default flag UseLogin in <b>/etc/sshd_config</b> is broken,
966: should not be used, and results in security problems on
967: other operating systems.</a>
1.294 david 968: <li><a href="errata27.html#bridge">May 26, 2000:
1.129 deraadt 969: The bridge(4) <i>learning</i> flag may be bypassed.
1.128 deraadt 970: (patch included)</a>
1.294 david 971: <li><a href="errata27.html#ipf">May 25, 2000:
1.127 kjell 972: Improper use of ipf <i>keep-state</i> rules can result
973: in firewall rules being bypassed. (patch included)</a>
974:
1.124 deraadt 975: </ul>
976:
977: <p>
978: <li>
1.288 matthieu 979: <a name="26"></a>
1.119 deraadt 980:
1.294 david 981: <h3><font color="#e00000">OpenBSD 2.6 Security Advisories</font></h3>
1.119 deraadt 982: These are the OpenBSD 2.6 advisories -- all these problems are solved
1.294 david 983: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.119 deraadt 984: OpenBSD 2.5 advisories listed below are fixed in OpenBSD 2.6.
985:
986: <p>
987: <ul>
1.294 david 988: <li><a href="errata26.html#semconfig">May 26, 2000:
1.130 deraadt 989: SYSV semaphore support contained an undocumented system call
1.131 deraadt 990: which could wedge semaphore-using processes from exiting. (patch included)</a>
1.294 david 991: <li><a href="errata26.html#ipf">May 25, 2000:
1.127 kjell 992: Improper use of ipf <i>keep-state</i> rules can result
993: in firewall rules being bypassed. (patch included)</a>
1.294 david 994: <li><a href="errata26.html#xlockmore">May 25, 2000:
1.125 deraadt 995: xlockmore has a bug which a localhost attacker can use to gain
996: access to the encrypted root password hash (which is normally
1.245 miod 997: encoded using blowfish</a> (see
1.294 david 998: <a href="http://www.openbsd.org/cgi-bin/man.cgi?query=crypt&sektion=3">
1.125 deraadt 999: crypt(3)</a>)
1.245 miod 1000: (patch included).
1.294 david 1001: <li><a href="errata26.html#procfs">Jan 20, 2000:
1.123 deraadt 1002: Systems running with procfs enabled and mounted are
1003: vulnerable to a very tricky exploit. procfs is not
1004: mounted by default.
1005: (patch included).</a>
1.294 david 1006: <li><a href="errata26.html#sendmail">Dec 4, 1999:
1.296 david 1007: Sendmail permitted any user to cause an aliases file wrap,
1.190 mpech 1008: thus exposing the system to a race where the aliases file
1009: did not exist.
1.119 deraadt 1010: (patch included).</a>
1.294 david 1011: <li><a href="errata26.html#poll">Dec 4, 1999:
1.190 mpech 1012: Various bugs in poll(2) may cause a kernel crash.</a>
1.294 david 1013: <li><a href="errata26.html#sslUSA">Dec 2, 1999:
1.120 deraadt 1014: A buffer overflow in the RSAREF code included in the
1015: USA version of libssl, is possibly exploitable in
1016: httpd, ssh, or isakmpd, if SSL/RSA features are enabled.
1.124 deraadt 1017: (patch included).<br></a>
1018: <strong>Update:</strong> Turns out that this was not exploitable
1019: in any of the software included in OpenBSD 2.6.
1.294 david 1020: <li><a href="errata26.html#ifmedia">Nov 9, 1999:
1.190 mpech 1021: Any user could change interface media configurations, resulting in
1022: a localhost denial of service attack.
1.121 deraadt 1023: (patch included).</a>
1.119 deraadt 1024: </ul>
1025:
1026: <p>
1027: <li>
1.288 matthieu 1028: <a name="25"></a>
1.106 deraadt 1029:
1.294 david 1030: <h3><font color="#e00000">OpenBSD 2.5 Security Advisories</font></h3>
1.93 deraadt 1031: These are the OpenBSD 2.5 advisories -- all these problems are solved
1.294 david 1032: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.93 deraadt 1033: OpenBSD 2.4 advisories listed below are fixed in OpenBSD 2.5.
1034:
1.96 deraadt 1035: <p>
1.104 deraadt 1036: <ul>
1.294 david 1037: <li><a href="errata25.html#cron">Aug 30, 1999:
1.103 deraadt 1038: In cron(8), make sure argv[] is NULL terminated in the
1039: fake popen() and run sendmail as the user, not as root.
1040: (patch included).</a>
1.294 david 1041: <li><a href="errata25.html#miscfs">Aug 12, 1999: The procfs and fdescfs
1.101 deraadt 1042: filesystems had an overrun in their handling of uio_offset
1043: in their readdir() routines. (These filesystems are not
1044: enabled by default). (patch included).</a>
1.294 david 1045: <li><a href="errata25.html#profil">Aug 9, 1999: Stop profiling (see profil(2))
1.100 deraadt 1046: when we execve() a new process. (patch included).</a>
1.294 david 1047: <li><a href="errata25.html#ipsec_in_use">Aug 6, 1999: Packets that should have
1.98 deraadt 1048: been handled by IPsec may be transmitted as cleartext.
1049: PF_KEY SA expirations may leak kernel resources.
1050: (patch included).</a>
1.294 david 1051: <li><a href="errata25.html#rc">Aug 5, 1999: In /etc/rc, use mktemp(1) for
1.97 deraadt 1052: motd re-writing and change the find(1) to use -execdir
1053: (patch included).</a>
1.294 david 1054: <li><a href="errata25.html#chflags">Jul 30, 1999: Do not permit regular
1.95 deraadt 1055: users to chflags(2) or fchflags(2) on character or block devices
1056: which they may currently be the owner of (patch included).</a>
1.294 david 1057: <li><a href="errata25.html#nroff">Jul 27, 1999: Cause groff(1) to be invoked
1.95 deraadt 1058: with the -S flag, when called by nroff(1) (patch included).</a>
1.93 deraadt 1059: </ul>
1060:
1.106 deraadt 1061: <p>
1062: <li>
1.288 matthieu 1063: <a name="24"></a>
1.235 miod 1064:
1.294 david 1065: <h3><font color="#e00000">OpenBSD 2.4 Security Advisories</font></h3>
1.75 deraadt 1066: These are the OpenBSD 2.4 advisories -- all these problems are solved
1.294 david 1067: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.75 deraadt 1068: OpenBSD 2.3 advisories listed below are fixed in OpenBSD 2.4.
1069:
1.96 deraadt 1070: <p>
1.75 deraadt 1071: <ul>
1.294 david 1072: <li><a href="errata24.html#poll">Mar 22, 1999: The nfds argument for poll(2) needs
1.91 deraadt 1073: to be constrained, to avoid kvm starvation (patch included).</a>
1.294 david 1074: <li><a href="errata24.html#tss">Mar 21, 1999: A change in TSS handling stops
1.91 deraadt 1075: another kernel crash case caused by the <strong>crashme</strong>
1076: program (patch included).</a>
1.294 david 1077: <li><a href="errata24.html#nlink">Feb 25, 1999: An unbounded increment on the
1.90 deraadt 1078: nlink value in FFS and EXT2FS filesystems can cause a system crash.
1.89 deraadt 1079: (patch included).</a>
1.294 david 1080: <li><a href="errata24.html#ping">Feb 23, 1999: Yet another buffer overflow
1.88 deraadt 1081: existed in ping(8). (patch included).</a>
1.294 david 1082: <li><a href="errata24.html#ipqrace">Feb 19, 1999: ipintr() had a race in use of
1.87 deraadt 1083: the ipq, which could permit an attacker to cause a crash.
1084: (patch included).</a>
1.294 david 1085: <li><a href="errata24.html#accept">Feb 17, 1999: A race condition in the
1.86 deraadt 1086: kernel between accept(2) and select(2) could permit an attacker
1087: to hang sockets from remote.
1088: (patch included).</a>
1.294 david 1089: <li><a href="errata24.html#maxqueue">Feb 17, 1999: IP fragment assembly can
1.85 deraadt 1090: bog the machine excessively and cause problems.
1091: (patch included).</a>
1.294 david 1092: <li><a href="errata24.html#trctrap">Feb 12, 1999: i386 T_TRCTRAP handling and
1.84 deraadt 1093: DDB interacted to possibly cause a crash.
1094: (patch included).</a>
1.294 david 1095: <li><a href="errata24.html#rst">Feb 11, 1999: TCP/IP RST handling was sloppy.
1.83 deraadt 1096: (patch included).</a>
1.294 david 1097: <li><a href="errata24.html#bootpd">Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 1098: problem in bootpd(8). (patch included).</a>
1.294 david 1099: <li><a href="errata24.html#termcap">Nov 19, 1998: There is a possibly locally
1.82 deraadt 1100: exploitable problem relating to environment variables in termcap
1101: and curses. (patch included).</a>
1.294 david 1102: <li><a href="errata24.html#tcpfix">Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 1103: bug in the TCP decoding kernel. (patch included).</a>
1.75 deraadt 1104: </ul>
1105:
1.106 deraadt 1106: <p>
1107: <li>
1.288 matthieu 1108: <a name="23"></a>
1.235 miod 1109:
1.294 david 1110: <h3><font color="#e00000">OpenBSD 2.3 Security Advisories</font></h3>
1.73 deraadt 1111: These are the OpenBSD 2.3 advisories -- all these problems are solved
1.294 david 1112: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.73 deraadt 1113: OpenBSD 2.2 advisories listed below are fixed in OpenBSD 2.3.
1.53 matthieu 1114:
1.96 deraadt 1115: <p>
1.53 matthieu 1116: <ul>
1.294 david 1117: <li><a href="errata23.html#bootpd">Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 1118: problem in bootpd(8). (patch included).</a>
1.294 david 1119: <li><a href="errata23.html#tcpfix">Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 1120: bug in the TCP decoding kernel. (patch included).</a>
1.294 david 1121: <li><a href="errata23.html#resolver">August 31, 1998: A benign looking resolver
1.190 mpech 1122: buffer overflow bug was re-introduced accidentally (patches included).</a>
1.294 david 1123: <li><a href="errata23.html#chpass">Aug 2, 1998:
1.190 mpech 1124: chpass(1) has a file descriptor leak which allows an
1125: attacker to modify /etc/master.passwd.</a>
1.294 david 1126: <li><a href="errata23.html#inetd">July 15, 1998: Inetd had a file descriptor leak.</a>
1127: <li><a href="errata23.html#fdalloc">Jul 2, 1998: setuid and setgid processes
1.72 deraadt 1128: should not be executed with fd slots 0, 1, or 2 free.
1129: (patch included).</a>
1.294 david 1130: <li><a href="errata23.html#xlib">June 6, 1998: Further problems with the X
1.71 deraadt 1131: libraries (patches included).</a>
1.294 david 1132: <li><a href="errata23.html#kill">May 17, 1998: kill(2) of setuid/setgid target
1.66 deraadt 1133: processes too permissive (4th revision patch included).</a>
1.294 david 1134: <li><a href="errata23.html#immutable">May 11, 1998: mmap() permits partial bypassing
1.60 deraadt 1135: of immutable and append-only file flags. (patch included).</a>
1.294 david 1136: <li><a href="errata23.html#ipsec">May 5, 1998: Incorrect handling of IPSEC packets
1.190 mpech 1137: if IPSEC is enabled (patch included).</a>
1.294 david 1138: <li><a href="errata23.html#xterm-xaw">May 1, 1998: Buffer overflow in xterm and Xaw
1.58 deraadt 1139: (CERT advisory VB-98.04) (patch included).</a>
1.53 matthieu 1140: </ul>
1.9 deraadt 1141:
1.106 deraadt 1142: <p>
1143: <li>
1.288 matthieu 1144: <a name="22"></a>
1.235 miod 1145:
1.294 david 1146: <h3><font color="#e00000">OpenBSD 2.2 Security Advisories</font></h3>
1.45 deraadt 1147: These are the OpenBSD 2.2 advisories. All these problems are solved
1.294 david 1148: in <a href="23.html">OpenBSD 2.3</a>. Some of these problems
1.45 deraadt 1149: still exist in other operating systems. (The supplied patches are for
1150: OpenBSD 2.2; they may or may not work on OpenBSD 2.1).
1.9 deraadt 1151:
1.96 deraadt 1152: <p>
1.9 deraadt 1153: <ul>
1.294 david 1154: <li><a href="errata22.html#ipsec">May 5, 1998: Incorrect handling of IPSEC
1.72 deraadt 1155: packets if IPSEC is enabled (patch included).</a>
1.294 david 1156: <li><a href="errata22.html#xterm-xaw">May 1, 1998: Buffer overflow in xterm
1.72 deraadt 1157: and Xaw (CERT advisory VB-98.04) (patch included).</a>
1.294 david 1158: <li><a href="errata22.html#uucpd">Apr 22, 1998: Buffer overflow in uucpd
1.72 deraadt 1159: (patch included).</a>
1.294 david 1160: <li><a href="errata22.html#rmjob">Apr 22, 1998: Buffer mismanagement in lprm
1.72 deraadt 1161: (patch included).</a>
1.294 david 1162: <li><a href="errata22.html#ping">Mar 31, 1998: Overflow in ping -R (patch included).</a>
1163: <li><a href="errata22.html#named">Mar 30, 1998: Overflow in named fake-iquery
1.59 deraadt 1164: (patch included).</a>
1.294 david 1165: <li><a href="errata22.html#mountd">Mar 2, 1998: Accidental NFS filesystem
1.72 deraadt 1166: export (patch included).</a>
1.112 philen 1167: <li><a href="advisories/mmap.txt">Feb 26, 1998: Read-write mmap() flaw.</a>
1.294 david 1168: Revision 3 of the patch is available <a href="errata22.html#mmap">here</a>
1.112 philen 1169: <li><a href="advisories/sourceroute.txt">Feb 19, 1998: Sourcerouted Packet
1.59 deraadt 1170: Acceptance.</a>
1.294 david 1171: A patch is available <a href="errata22.html#sourceroute">here</a>.
1172: <li><a href="errata22.html#ruserok">Feb 13, 1998: Setuid coredump & Ruserok()
1.72 deraadt 1173: flaw (patch included).</a>
1.294 david 1174: <li><a href="errata22.html#ldso">Feb 9, 1998: MIPS ld.so flaw (patch included).</a>
1.1 deraadt 1175: </ul>
1176:
1.106 deraadt 1177: <p>
1178: <li>
1.288 matthieu 1179: <a name="21"></a>
1.235 miod 1180:
1.294 david 1181: <h3><font color="#e00000">OpenBSD 2.1 Security Advisories</font></h3>
1.52 deraadt 1182: These are the OpenBSD 2.1 advisories. All these problems are solved
1.294 david 1183: in <a href="22.html">OpenBSD 2.2</a>. Some of these problems still
1.52 deraadt 1184: exist in other operating systems. (If you are running OpenBSD 2.1, we
1185: would strongly recommend an upgrade to the newest release, as this
1186: patch list only attempts at fixing the most important security
1187: problems. In particular, OpenBSD 2.2 fixes numerous localhost
1188: security problems. Many of those problems were solved in ways which
1189: make it hard for us to provide patches).
1190:
1.96 deraadt 1191: <p>
1.52 deraadt 1192: <ul>
1.112 philen 1193: <li><a href="advisories/signals.txt">Sep 15, 1997: Deviant Signals (patch included)</a>
1194: <li><a href="advisories/rfork.txt">Aug 2, 1997: Rfork() system call flaw
1.59 deraadt 1195: (patch included)</a>
1.112 philen 1196: <li><a href="advisories/procfs.txt">Jun 24, 1997: Procfs flaws (patch included)</a>
1.52 deraadt 1197: </ul>
1.51 deraadt 1198:
1.106 deraadt 1199: <p>
1200: <li>
1.288 matthieu 1201: <a name="20"></a>
1.235 miod 1202:
1.294 david 1203: <h3><font color="#e00000">OpenBSD 2.0 Security Advisories</font></h3>
1.99 deraadt 1204: These are the OpenBSD 2.0 advisories. All these problems are solved
1.294 david 1205: in <a href="21.html">OpenBSD 2.1</a>. Some of these problems still
1.99 deraadt 1206: exist in other operating systems. (If you are running OpenBSD 2.0, we
1207: commend you for being there back in the old days!, but you're really
1208: missing out if you don't install a new version!)
1209:
1210: <p>
1211: <ul>
1.112 philen 1212: <li><a href="advisories/res_random.txt">April 22, 1997: Predictable IDs in the
1.99 deraadt 1213: resolver (patch included)</a>
1214: <li>Many others... if people can hunt them down, please let me know
1215: and we'll put them up here.
1216: </ul>
1.51 deraadt 1217: <p>
1.106 deraadt 1218:
1.288 matthieu 1219: <a name="watching"></a>
1.294 david 1220: <li><h3><font color="#e00000">Watching our Changes</font></h3><p>
1.106 deraadt 1221:
1.21 deraadt 1222: Since we take a proactive stance with security, we are continually
1223: finding and fixing new security problems. Not all of these problems
1.80 espie 1224: get widely reported because (as stated earlier) many of them are not
1.45 deraadt 1225: confirmed to be exploitable; many simple bugs we fix do turn out to
1226: have security consequences we could not predict. We do not have the
1227: time resources to make these changes available in the above format.<p>
1.21 deraadt 1228:
1229: Thus there are usually minor security fixes in the current source code
1230: beyond the previous major OpenBSD release. We make a limited
1.45 deraadt 1231: guarantee that these problems are of minimal impact and unproven
1.44 ian 1232: exploitability. If we discover that a problem definitely matters for
1.45 deraadt 1233: security, patches will show up here <strong>VERY</strong> quickly.<p>
1.21 deraadt 1234:
1.45 deraadt 1235: People who are really concerned with security can do a number of
1236: things:<p>
1.21 deraadt 1237:
1238: <ul>
1239: <li>If you understand security issues, watch our
1.294 david 1240: <a href="mail.html">source-changes mailing list</a> and keep an
1.23 deraadt 1241: eye out for things which appear security related. Since
1.21 deraadt 1242: exploitability is not proven for many of the fixes we make,
1243: do not expect the relevant commit message to say "SECURITY FIX!".
1244: If a problem is proven and serious, a patch will be available
1245: here very shortly after.
1.161 horacio 1246: <li>In addition to source changes, you can watch our <a href="mail.html">
1.160 ericj 1247: security-announce mailing list</a> which will notify you for every
1.186 ian 1248: security related item that the OpenBSD team deems as a possible threat,
1.160 ericj 1249: and instruct you on how to patch the problem.
1.21 deraadt 1250: <li>Track our current source code tree, and teach yourself how to do a
1.29 deraadt 1251: complete system build from time to time (read /usr/src/Makefile
1252: carefully). Users can make the assumption that the current
1253: source tree always has stronger security than the previous release.
1.45 deraadt 1254: However, building your own system from source code is not trivial;
1.265 miod 1255: it is nearly 600MB of source code, and problems do occur as we
1.45 deraadt 1256: transition between major releases.
1.115 ericj 1257: <li>Install a binary snapshot for your
1.80 espie 1258: architecture, which are made available fairly often. For
1.29 deraadt 1259: instance, an i386 snapshot is typically made available weekly.
1.21 deraadt 1260: </ul>
1261:
1.9 deraadt 1262: <p>
1.288 matthieu 1263: <a name="reporting"></a>
1.294 david 1264: <li><h3><font color="#e00000">Reporting problems</font></h3><p>
1.3 deraadt 1265:
1.5 deraadt 1266: <p> If you find a new security problem, you can mail it to
1.294 david 1267: <a href="mailto:deraadt@openbsd.org">deraadt@openbsd.org</a>.
1.7 deraadt 1268: <br>
1.5 deraadt 1269: If you wish to PGP encode it (but please only do so if privacy is very
1.112 philen 1270: urgent, since it is inconvenient) use this <a href="advisories/pgpkey.txt">pgp key</a>.
1.5 deraadt 1271:
1.107 deraadt 1272: <p>
1.288 matthieu 1273: <a name="papers"></a>
1.294 david 1274: <li><h3><font color="#e00000">Further Reading</font></h3><p>
1.107 deraadt 1275:
1276: A number of papers have been written by OpenBSD team members, about security
1277: related changes they have done in OpenBSD. The postscript versions of these
1.108 deraadt 1278: documents are available as follows.<p>
1.107 deraadt 1279:
1280: <ul>
1.113 deraadt 1281: <li>A Future-Adaptable Password Scheme.<br>
1.294 david 1282: <a href="events.html#usenix99">Usenix 1999</a>,
1283: by <a href="mailto:provos@openbsd.org">Niels Provos</a>,
1284: <a href="mailto:dm@openbsd.org">David Mazieres</a>.<br>
1285: <a href="papers/bcrypt-paper.ps">paper</a> and
1286: <a href="papers/bcrypt-slides.ps">slides</a>.
1.113 deraadt 1287: <p>
1288: <li>Cryptography in OpenBSD: An Overview.<br>
1.294 david 1289: <a href="events.html#usenix99">Usenix 1999</a>,
1290: by <a href="mailto:deraadt@openbsd.org">Theo de Raadt</a>,
1291: <a href="mailto:niklas@openbsd.org">Niklas Hallqvist</a>,
1292: <a href="mailto:art@openbsd.org">Artur Grabowski</a>,
1293: <a href="mailto:angelos@openbsd.org">Angelos D. Keromytis</a>,
1294: <a href="mailto:provos@openbsd.org">Niels Provos</a>.<br>
1295: <a href="papers/crypt-paper.ps">paper</a> and
1296: <a href="papers/crypt-slides.ps">slides</a>.
1.113 deraadt 1297: <p>
1298: <li>strlcpy and strlcat -- consistent, safe, string copy and concatenation.<br>
1.294 david 1299: <a href="events.html#usenix99">Usenix 1999</a>,
1300: by <a href="mailto:millert@openbsd.org">Todd C. Miller</a>,
1301: <a href="mailto:deraadt@openbsd.org">Theo de Raadt</a>.<br>
1302: <a href="papers/strlcpy-paper.ps">paper</a> and
1303: <a href="papers/strlcpy-slides.ps">slides</a>.
1.113 deraadt 1304: <p>
1.118 deraadt 1305: <li>Dealing with Public Ethernet Jacks-Switches, Gateways, and Authentication.<br>
1.294 david 1306: <a href="events.html#lisa99">LISA 1999</a>,
1307: by <a href="mailto:beck@openbsd.org">Bob Beck</a>.<br>
1308: <a href="papers/authgw-paper.ps">paper</a> and
1309: <a href="papers/authgw-slides.ps">slides</a>.
1.118 deraadt 1310: <p>
1.153 jufi 1311: <li>Encrypting Virtual Memory<br>
1.294 david 1312: <a href="events.html#sec2000">Usenix Security 2000</a>,
1313: <a href="mailto:provos@openbsd.org">Niels Provos</a>.<br>
1314: <a href="papers/swapencrypt.ps">paper</a> and
1315: <a href="papers/swapencrypt-slides.ps">slides</a>.
1.142 deraadt 1316: <p>
1.107 deraadt 1317: </ul>
1.294 david 1318: </ul>
1.106 deraadt 1319:
1.2 deraadt 1320: <hr>
1.294 david 1321: <a href="index.html"><img height=24 width=24 src="back.gif" border=0 alt="OpenBSD"></a>
1322: <a href="mailto:www@openbsd.org">www@openbsd.org</a>
1.24 deraadt 1323: <br>
1.307 ! brad 1324: <small>$OpenBSD: security.html,v 1.306 2005/02/28 19:42:35 brad Exp $</small>
1.1 deraadt 1325:
1.24 deraadt 1326: </body>
1327: </html>
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