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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>
1.310 ! brad 232: <li><a href="errata.html#cvs">Apr 28, 2005:
! 233: Fix a buffer overflow, memory leaks, and NULL pointer
! 234: dereference in cvs(1).</a>
1.309 brad 235: <li><a href="errata.html#telnet">Mar 30, 2005:
236: Due to buffer overflows in telnet(1), a malicious
237: server or man-in-the-middle attack could allow
238: execution of arbitrary code with the privileges of
239: the user invoking telnet(1).</a>
1.307 brad 240: <li><a href="errata.html#copy">Mar 16, 2005:
241: More stringent checking should be done in the copy(9)
242: functions to prevent their misuse.</a>
1.306 brad 243: <li><a href="errata.html#locore">Feb 28, 2005:
244: More stringent checking should be done in the copy(9)
245: functions to prevent their misuse.</a>
1.304 brad 246: <li><a href="errata.html#httpd">Jan 12, 2005:
247: httpd(8)'s mod_include module fails to properly validate
248: the length of user supplied tag strings prior to copying
1.305 brad 249: them to a local buffer, causing a buffer overflow.</a>
1.302 markus 250: <li><a href="errata.html#pfkey">Dec 14, 2004:
251: On systems running isakmpd(8) it is possible for a local
252: user to cause kernel memory corruption and system panic by
1.303 markus 253: setting ipsec(4) credentials on a socket.</a>
1.302 markus 254: </ul>
1.301 miod 255:
256: <p>
257: <li>
1.288 matthieu 258: <a name="35"></a>
1.279 deraadt 259:
1.294 david 260: <h3><font color="#e00000">OpenBSD 3.5 Security Advisories</font></h3>
1.279 deraadt 261: These are the OpenBSD 3.5 advisories -- all these problems are solved
262: in <a href=anoncvs.html>OpenBSD current</a> and the
263: <a href=stable.html>patch branch</a>.
264:
265: <p>
266: <ul>
1.310 ! brad 267: <li><a href="errata35.html#cvs4">Apr 28, 2005:
! 268: Fix a buffer overflow, memory leaks, and NULL pointer
! 269: dereference in cvs(1).</a>
1.309 brad 270: <li><a href="errata35.html#telnet">Mar 30, 2005:
271: Due to buffer overflows in telnet(1), a malicious
272: server or man-in-the-middle attack could allow
273: execution of arbitrary code with the privileges of
274: the user invoking telnet(1).</a>
1.308 brad 275: <li><a href="errata35.html#copy">Mar 16, 2005:
1.307 brad 276: More stringent checking should be done in the copy(9)
277: functions to prevent their misuse.</a>
1.306 brad 278: <li><a href="errata35.html#locore">Feb 28, 2005:
279: More stringent checking should be done in the copy(9)
280: functions to prevent their misuse.</a>
1.304 brad 281: <li><a href="errata35.html#httpd3">Jan 12, 2005:
282: httpd(8)'s mod_include module fails to properly validate
283: the length of user supplied tag strings prior to copying
1.305 brad 284: them to a local buffer, causing a buffer overflow.</a>
1.302 markus 285: <li><a href="errata35.html#pfkey">Dec 14, 2004:
286: On systems running isakmpd(8) it is possible for a local
287: user to cause kernel memory corruption and system panic by
1.303 markus 288: setting ipsec(4) credentials on a socket.</a>
1.301 miod 289: <li><a href="errata35.html#radius">Sep 20, 2004:
1.299 millert 290: Radius-based authentication is vulnerable to spoofed replies.</a>
1.301 miod 291: <li><a href="errata35.html#xpm">Sep 16, 2004:
1.298 brad 292: The Xpm library has vulnerabilities when parsing malicious images.</a>
1.301 miod 293: <li><a href="errata35.html#httpd2"> Sep 10, 2004:
1.297 brad 294: httpd(8)'s mod_rewrite module can be made to write one zero byte in
295: an arbitrary memory position outside of a char array, causing a DoS
296: or possibly buffer overflows.</a>
1.301 miod 297: <li><a href="errata35.html#httpd"> Jun 12, 2004:
1.300 deraadt 298: Multiple vulnerabilities have been found in httpd(8) / mod_ssl.</a>
1.301 miod 299: <li><a href="errata35.html#isakmpd"> Jun 10, 2004:
1.291 hshoexer 300: isakmpd(8) still has issues with unauthorized SA deletion,
1.293 brad 301: an attacker can delete IPsec tunnels at will.</a>
1.301 miod 302: <li><a href="errata35.html#cvs3"> Jun 9, 2004:
1.290 millert 303: Multiple remote vulnerabilities have been found in the cvs(1)
304: server which can be used by CVS clients to crash or execute
1.293 brad 305: arbitrary code on the server.</a>
1.301 miod 306: <li><a href="errata35.html#kerberos"> May 30, 2004:
1.289 beck 307: kdc(8) performs inadequate checking of request fields, leading
308: to the possibility of principal impersonation from other
309: Kerberos realms if they are trusted with a cross-realm trust.</a>
1.301 miod 310: <li><a href="errata35.html#xdm"> May 26, 2004:
1.287 matthieu 311: xdm(1) ignores the requestPort resource and creates a
1.293 brad 312: listening socket regardless of the setting in xdm-config.</a>
1.301 miod 313: <li><a href="errata35.html#cvs2"> May 20, 2004:
1.286 otto 314: A buffer overflow in the cvs(1) server has been found,
315: which can be used by CVS clients to execute arbitrary code on
1.293 brad 316: the server.</a>
1.301 miod 317: <li><a href="errata35.html#procfs"> May 13, 2004:
1.282 tedu 318: Integer overflow problems were found in procfs, allowing
1.293 brad 319: reading of arbitrary kernel memory.</a>
1.301 miod 320: <li><a href="errata35.html#cvs"> May 5, 2004:
1.281 otto 321: Pathname validation problems have been found in cvs(1),
322: allowing clients and servers access to files outside the
1.293 brad 323: repository or local CVS tree.</a>
1.279 deraadt 324: </ul>
325:
326: <p>
1.301 miod 327: OpenBSD 3.4 and earlier releases are not supported anymore. The following
328: paragraphs only list advisories issued while they were maintained; these
329: releases are likely to be affected by the advisories for more recent releases.
330: <br>
331:
1.279 deraadt 332: <li>
1.288 matthieu 333: <a name="34"></a>
1.261 david 334:
1.294 david 335: <h3><font color="#e00000">OpenBSD 3.4 Security Advisories</font></h3>
1.261 david 336: These are the OpenBSD 3.4 advisories -- all these problems are solved
1.301 miod 337: in <a href="anoncvs.html">OpenBSD current</a>. The
338: <a href="stable.html">patch branch</a> for 3.4 is no longer being maintained,
339: you should update your machine.
1.261 david 340: <p>
341: <ul>
1.302 markus 342: <li><a href="errata34.html#pfkey">Dec 14, 2004:
343: On systems running isakmpd(8) it is possible for a local
344: user to cause kernel memory corruption and system panic by
1.303 markus 345: setting ipsec(4) credentials on a socket.</a>
1.298 brad 346: <li><a href="errata34.html#xpm">Sep 16, 2004:
347: The Xpm library has vulnerabilities when parsing malicious images.</a>
1.297 brad 348: <li><a href="errata34.html#httpd4"> Sep 10, 2004:
349: httpd(8)'s mod_rewrite module can be made to write one zero byte in
350: an arbitrary memory position outside of a char array, causing a DoS
351: or possibly buffer overflows.</a>
1.294 david 352: <li><a href="errata34.html#httpd3"> Jun 12, 2004:
1.300 deraadt 353: Multiple vulnerabilities have been found in httpd(8) / mod_ssl.</a>
1.294 david 354: <li><a href="errata34.html#isakmpd3"> Jun 10, 2004:
1.292 brad 355: isakmpd(8) still has issues with unauthorized SA deletion,
1.293 brad 356: an attacker can delete IPsec tunnels at will.</a>
1.294 david 357: <li><a href="errata34.html#cvs3"> Jun 9, 2004:
1.290 millert 358: Multiple remote vulnerabilities have been found in the cvs(1)
359: server which can be used by CVS clients to crash or execute
1.293 brad 360: arbitrary code on the server.</a>
1.294 david 361: <li><a href="errata34.html#kerberos"> May 30, 2004:
1.289 beck 362: kdc(8) performs inadequate checking of request fields, leading
363: to the possibility of principal impersonation from other
364: Kerberos realms if they are trusted with a cross-realm trust.</a>
1.294 david 365: <li><a href="errata34.html#cvs2"> May 20, 2004:
1.286 otto 366: A buffer overflow in the cvs(1) server has been found,
367: which can be used by CVS clients to execute arbitrary code on
368: the server.</a>
1.294 david 369: <li><a href="errata34.html#procfs"> May 13, 2004:
1.282 tedu 370: Integer overflow problems were found in procfs, allowing
371: reading of arbitrary kernel memory.</a>
1.294 david 372: <li><a href="errata34.html#cvs"> May 5, 2004:
1.281 otto 373: Pathname validation problems have been found in cvs(1),
374: allowing clients and servers access to files outside the
375: repository or local CVS tree.</a>
1.294 david 376: <li><a href="errata34.html#openssl"> March 17, 2004:
1.277 millert 377: A missing check for a NULL-pointer dereference may allow a
1.281 otto 378: remote attacker to crash applications using OpenSSL.</a>
1.294 david 379: <li><a href="errata34.html#isakmpd2"> March 17, 2004:
1.276 brad 380: Defects in the payload validation and processing functions of
381: isakmpd have been discovered. An attacker could send malformed
382: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.294 david 383: <li><a href="errata34.html#httpd2"> March 13, 2004:
1.275 brad 384: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
385: access module, using IP addresses without a netmask on big endian
386: 64-bit platforms causes the rules to fail to match.</a>
1.294 david 387: <li><a href="errata34.html#ip6"> February 8, 2004:
1.272 dhartmei 388: An IPv6 MTU handling problem exists that could be used by an
389: attacker to cause a denial of service attack.</a>
1.294 david 390: <li><a href="errata34.html#sysvshm"> February 5, 2004:
1.271 millert 391: A reference counting bug in shmat(2) could be used to write to
392: kernel memory under certain circumstances.</a>
1.294 david 393: <li><a href="errata34.html#isakmpd">January 13, 2004:
1.266 brad 394: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 395: by Thomas Walpuski.</a>
1.294 david 396: <li><a href="errata34.html#ibcs2">November 17, 2003:
1.264 henning 397: It may be possible for a local user to overrun the stack in
398: compat_ibcs2(8) and cause a kernel panic.</a>
1.294 david 399: <li><a href="errata34.html#asn1">November 1, 2003:
1.262 margarid 400: The use of certain ASN.1 encodings or malformed public keys may
401: allow an attacker to mount a denial of service attack against
402: applications linked with ssl(3).</a>
1.261 david 403: </ul>
404:
405: <li>
1.288 matthieu 406: <a name="33"></a>
1.246 deraadt 407:
1.294 david 408: <h3><font color="#e00000">OpenBSD 3.3 Security Advisories</font></h3>
1.246 deraadt 409: These are the OpenBSD 3.3 advisories -- all these problems are solved
1.294 david 410: in <a href="anoncvs.html">OpenBSD current</a>. The
411: <a href="stable.html">patch branch</a> for 3.3 is no longer being maintained,
1.284 otto 412: you should update your machine.
1.246 deraadt 413: <p>
414: <ul>
1.294 david 415: <li><a href="errata33.html#cvs"> May 5, 2004:
1.281 otto 416: Pathname validation problems have been found in cvs(1),
417: allowing clients and servers access to files outside the
418: repository or local CVS tree.</a>
1.294 david 419: <li><a href="errata33.html#openssl"> March 17, 2004:
1.277 millert 420: A missing check for a NULL-pointer dereference may allow a
1.281 otto 421: remote attacker to crash applications using OpenSSL.</a>
1.294 david 422: <li><a href="errata33.html#isakmpd2"> March 17, 2004:
1.276 brad 423: Defects in the payload validation and processing functions of
424: isakmpd have been discovered. An attacker could send malformed
425: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.294 david 426: <li><a href="errata33.html#httpd2"> March 13, 2004:
1.275 brad 427: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
428: access module, using IP addresses without a netmask on big endian
429: 64-bit platforms causes the rules to fail to match.</a>
1.294 david 430: <li><a href="errata33.html#ip6"> February 8, 2004:
1.275 brad 431: An IPv6 MTU handling problem exists that could be used by an
432: attacker to cause a denial of service attack.</a>
1.294 david 433: <li><a href="errata33.html#sysvshm"> February 5, 2004:
1.271 millert 434: A reference counting bug in shmat(2) could be used to write to
435: kernel memory under certain circumstances.</a>
1.294 david 436: <li><a href="errata33.html#isakmpd">January 15, 2004:
1.268 brad 437: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 438: by Thomas Walpuski.</a>
1.294 david 439: <li><a href="errata33.html#ibcs2">November 17, 2003:
1.264 henning 440: It may be possible for a local user to execute arbitrary code
441: resulting in escalation of privileges due to a stack overrun
442: in compat_ibcs2(8).</a>
1.294 david 443: <li><a href="errata33.html#asn1">October 1, 2003:
1.257 millert 444: The use of certain ASN.1 encodings or malformed public keys may
445: allow an attacker to mount a denial of service attack against
446: applications linked with ssl(3).</a>
1.294 david 447: <li><a href="errata33.html#pfnorm">September 24, 2003:
1.258 beck 448: Access of freed memory in pf(4) could be used to
1.260 margarid 449: remotely panic a machine using scrub rules.</a>
1.294 david 450: <li><a href="errata33.html#sendmail">September 17, 2003:
1.256 millert 451: A buffer overflow in the address parsing in
452: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 453: <li><a href="errata33.html#sshbuffer">September 16, 2003:
1.255 millert 454: OpenSSH versions prior to 3.7 contains a buffer management error
455: that is potentially exploitable.</a>
1.294 david 456: <li><a href="errata33.html#sysvsem">September 10, 2003:
1.254 millert 457: Root may be able to reduce the security level by taking advantage of
458: an integer overflow when the semaphore limits are made very large.</a>
1.294 david 459: <li><a href="errata33.html#semget">August 20, 2003:
1.252 millert 460: An improper bounds check in the kernel may allow a local user
461: to panic the kernel.</a>
1.294 david 462: <li><a href="errata33.html#realpath">August 4, 2003:
1.249 millert 463: An off-by-one error exists in the C library function realpath(3)
464: may allow an attacker to gain escalated privileges.</a>
1.246 deraadt 465: </ul>
466:
1.265 miod 467:
1.247 david 468: <p>
1.246 deraadt 469: <li>
1.288 matthieu 470: <a name="32"></a>
1.224 deraadt 471:
1.294 david 472: <h3><font color="#e00000">OpenBSD 3.2 Security Advisories</font></h3>
1.224 deraadt 473: These are the OpenBSD 3.2 advisories -- all these problems are solved
1.294 david 474: in <a href="anoncvs.html">OpenBSD current</a>. The
475: <a href="stable.html">patch branch</a> for 3.2 is no longer being maintained,
1.265 miod 476: you should update your machine.
1.224 deraadt 477: <p>
478: <ul>
1.294 david 479: <li><a href="errata32.html#asn1">October 1, 2003:
1.257 millert 480: The use of certain ASN.1 encodings or malformed public keys may
481: allow an attacker to mount a denial of service attack against
482: applications linked with ssl(3). This does not affect OpenSSH.</a>
1.294 david 483: <li><a href="errata32.html#pfnorm">September 24, 2003:
1.258 beck 484: Access of freed memory in pf(4) could be used to
1.260 margarid 485: remotely panic a machine using scrub rules.</a>
1.294 david 486: <li><a href="errata32.html#sendmail4">September 17, 2003:
1.256 millert 487: A buffer overflow in the address parsing in
488: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 489: <li><a href="errata32.html#sshbuffer">September 16, 2003:
1.255 millert 490: OpenSSH versions prior to 3.7 contains a buffer management error
491: that is potentially exploitable.</a>
1.294 david 492: <li><a href="errata32.html#sendmail3">August 25, 2003:
1.253 brad 493: Fix for a potential security issue in
494: sendmail(8) with respect to DNS maps.</a>
1.294 david 495: <li><a href="errata32.html#realpath">August 4, 2003:
1.249 millert 496: An off-by-one error exists in the C library function realpath(3)
497: may allow an attacker to gain escalated privileges.</a>
1.294 david 498: <li><a href="errata32.html#sendmail2">March 31, 2003:
1.244 miod 499: A buffer overflow in the address parsing in
500: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 501: <li><a href="errata32.html#kerberos">March 24, 2003:
1.242 millert 502: A cryptographic weaknesses in the Kerberos v4 protocol can be
503: exploited on Kerberos v5 as well.</a>
1.294 david 504: <li><a href="errata32.html#kpr">March 19, 2003:
1.241 jufi 505: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 506: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.294 david 507: <li><a href="errata32.html#blinding">March 18, 2003:
1.239 miod 508: Various SSL and TLS operations in OpenSSL are vulnerable to
509: timing attacks.</a>
1.294 david 510: <li><a href="errata32.html#lprm">March 5, 2003:
1.238 millert 511: A buffer overflow in lprm(1) may allow an attacker to elevate
512: privileges to user daemon.</a>.
1.294 david 513: <li><a href="errata32.html#sendmail">March 3, 2003:
1.237 miod 514: A buffer overflow in the envelope comments processing in
515: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 516: <li><a href="errata32.html#httpd">February 25, 2003:
1.236 margarid 517: httpd(8) leaks file inode numbers via ETag header as well as
518: child PIDs in multipart MIME boundary generation. This could
519: lead, for example, to NFS exploitation because it uses inode
520: numbers as part of the file handle.</a>
1.294 david 521: <li><a href="errata32.html#ssl">February 22, 2003:
1.234 margarid 522: In ssl(8) an information leak can occur via timing by performing
523: a MAC computation even if incorrect block cipher padding has
524: been found, this is a countermeasure. Also, check for negative
525: sizes, in allocation routines.</a>
1.294 david 526: <li><a href="errata32.html#cvs">January 20, 2003:
1.232 millert 527: A double free exists in cvs(1) that could lead to privilege
528: escalation for cvs configurations where the cvs command is
1.233 margarid 529: run as a privileged user.</a>
1.294 david 530: <li><a href="errata32.html#named">November 14, 2002:
1.230 millert 531: A buffer overflow exists in named(8) that could lead to a
532: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 533: <li><a href="errata32.html#pool">November 6, 2002:
1.233 margarid 534: A logic error in the pool kernel memory allocator could cause
535: memory corruption in low-memory situations, causing the system
536: to crash.</a>
1.294 david 537: <li><a href="errata32.html#smrsh">November 6, 2002:
1.229 miod 538: An attacker can bypass smrsh(8)'s restrictions and execute
539: arbitrary commands with the privileges of his own account.</a>
1.294 david 540: <li><a href="errata32.html#pfbridge">November 6, 2002:
1.233 margarid 541: Network bridges running pf with scrubbing enabled could cause
542: mbuf corruption, causing the system to crash.</a>
1.294 david 543: <li><a href="errata32.html#kadmin">October 21, 2002:
1.228 miod 544: A buffer overflow can occur in the kadmind(8) daemon, leading
545: to possible remote crash or exploit.</a>
1.224 deraadt 546: </ul>
547:
1.227 miod 548: <p>
549: <li>
1.288 matthieu 550: <a name="31"></a>
1.203 deraadt 551:
1.294 david 552: <h3><font color="#e00000">OpenBSD 3.1 Security Advisories</font></h3>
1.203 deraadt 553: These are the OpenBSD 3.1 advisories -- all these problems are solved
1.294 david 554: in <a href="anoncvs.html">OpenBSD current</a>. The
555: <a href="stable.html">patch branch</a> for 3.1 is no longer being maintained,
1.258 beck 556: you should update your machine.
1.203 deraadt 557:
558: <p>
559: <ul>
1.294 david 560: <li><a href="errata31.html#sendmail2">March 31, 2003:
1.244 miod 561: A buffer overflow in the address parsing in
562: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 563: <li><a href="errata31.html#kerberos">March 24, 2003:
1.242 millert 564: A cryptographic weaknesses in the Kerberos v4 protocol can be
565: exploited on Kerberos v5 as well.</a>
1.294 david 566: <li><a href="errata31.html#kpr">March 19, 2003:
1.241 jufi 567: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 568: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.294 david 569: <li><a href="errata31.html#blinding">March 18, 2003:
1.239 miod 570: Various SSL and TLS operations in OpenSSL are vulnerable to
571: timing attacks.</a>
1.294 david 572: <li><a href="errata31.html#lprm">March 4, 2003:
1.238 millert 573: A buffer overflow in lprm(1) may allow an attacker to gain
574: root privileges.</a>
1.294 david 575: <li><a href="errata31.html#sendmail">March 3, 2003:
1.237 miod 576: A buffer overflow in the envelope comments processing in
577: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 578: <li><a href="errata31.html#ssl2">February 23, 2003:
1.235 miod 579: In ssl(8) an information leak can occur via timing by performing
580: a MAC computation even if incorrect block cipher padding has
581: been found, this is a countermeasure. Also, check for negative
582: sizes, in allocation routines.</a>
1.294 david 583: <li><a href="errata31.html#cvs">January 20, 2003:
1.232 millert 584: A double free exists in cvs(1) that could lead to privilege
585: escalation for cvs configurations where the cvs command is
1.294 david 586: run as a privileged user</a>.
587: <li><a href="errata31.html#named">November 14, 2002:
1.230 millert 588: A buffer overflow exists in named(8) that could lead to a
589: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 590: <li><a href="errata31.html#kernresource">November 6, 2002:
1.229 miod 591: Incorrect argument checking in the getitimer(2) system call
592: may allow an attacker to crash the system.</a>
1.294 david 593: <li><a href="errata31.html#smrsh">November 6, 2002:
1.229 miod 594: An attacker can bypass smrsh(8)'s restrictions and execute
595: arbitrary commands with the privileges of his own account.</a>
1.294 david 596: <li><a href="errata31.html#kadmin">October 21, 2002:
1.226 miod 597: A buffer overflow can occur in the kadmind(8) daemon, leading
598: to possible remote crash or exploit.</a>
1.294 david 599: <li><a href="errata31.html#kerntime">October 2, 2002:
1.222 jason 600: Incorrect argument checking in the setitimer(2) system call
601: may allow an attacker to write to kernel memory.</a>
1.294 david 602: <li><a href="errata31.html#scarg">August 11, 2002:
1.221 provos 603: An insufficient boundary check in the select system call
1.220 miod 604: allows an attacker to overwrite kernel memory and execute arbitrary code
605: in kernel context.</a>
1.294 david 606: <li><a href="errata31.html#ssl">July 30, 2002:
1.218 miod 607: Several remote buffer overflows can occur in the SSL2 server and SSL3
608: client of the ssl(8) library, as in the ASN.1 parser code in the
609: crypto(3) library, all of them being potentially remotely
610: exploitable.</a>
1.294 david 611: <li><a href="errata31.html#xdr">July 29, 2002:
1.218 miod 612: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
613: possible remote crash.</a>
1.294 david 614: <li><a href="errata31.html#pppd">July 29, 2002:
1.218 miod 615: A race condition exists in the pppd(8) daemon which may cause it to
616: alter the file permissions of an arbitrary file.</a>
1.294 david 617: <li><a href="errata31.html#isakmpd">July 5, 2002:
1.218 miod 618: Receiving IKE payloads out of sequence can cause isakmpd(8) to
619: crash.</a>
1.294 david 620: <li><a href="errata31.html#ktrace">June 27, 2002:
1.215 miod 621: The kernel would let any user ktrace set[ug]id processes.</a>
1.294 david 622: <li><a href="errata31.html#modssl">June 26, 2002:
1.213 miod 623: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 624: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.294 david 625: <li><a href="errata31.html#resolver">June 25, 2002:
1.212 millert 626: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 627: <li><a href="errata31.html#sshd">June 24, 2002:
1.216 deraadt 628: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 629: input validation error that can result in an integer overflow and
630: privilege escalation.</a>
1.294 david 631: <li><a href="errata31.html#httpd">June 19, 2002:
1.211 miod 632: A buffer overflow can occur during the interpretation of chunked
633: encoding in httpd(8), leading to possible remote crash.</a>
1.294 david 634: <li><a href="errata31.html#sshbsdauth">May 22, 2002:
1.209 markus 635: Under certain conditions, on systems using YP with netgroups
636: in the password database, it is possible that sshd(8) does
637: ACL checks for the requested user name but uses the password
638: database entry of a different user for authentication. This
639: means that denied users might authenticate successfully
640: while permitted users could be locked out.</a>
1.294 david 641: <li><a href="errata31.html#fdalloc2">May 8, 2002:
1.208 millert 642: A race condition exists that could defeat the kernel's
643: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 644: <li><a href="errata31.html#sudo">April 25, 2002:
1.205 millert 645: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 646: <li><a href="errata31.html#sshafs">April 22, 2002:
1.205 millert 647: A local user can gain super-user privileges due to a buffer
648: overflow in sshd(8) if AFS has been configured on the system
649: or if KerberosTgtPassing or AFSTokenPassing has been enabled
650: in the sshd_config file.</a>
1.203 deraadt 651: </ul>
652:
1.235 miod 653: <p>
1.203 deraadt 654: <li>
1.288 matthieu 655: <a name="30"></a>
1.187 deraadt 656:
1.294 david 657: <h3><font color="#e00000">OpenBSD 3.0 Security Advisories</font></h3>
1.187 deraadt 658: These are the OpenBSD 3.0 advisories -- all these problems are solved
1.294 david 659: in <a href="anoncvs.html">OpenBSD current</a>. The
660: <a href="stable.html">patch branch</a> for 3.0 is no longer being maintained,
1.258 beck 661: you should update your machine.
1.187 deraadt 662:
663: <p>
664: <ul>
1.294 david 665: <li><a href="errata30.html#named">November 14, 2002:
1.230 millert 666: A buffer overflow exists in named(8) that could lead to a
667: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 668: <li><a href="errata30.html#kernresource">November 6, 2002:
1.229 miod 669: Incorrect argument checking in the getitimer(2) system call
670: may allow an attacker to crash the system.</a>
1.294 david 671: <li><a href="errata30.html#smrsh">November 6, 2002:
1.229 miod 672: An attacker can bypass smrsh(8)'s restrictions and execute
673: arbitrary commands with the privileges of his own account.</a>
1.294 david 674: <li><a href="errata30.html#kadmin">October 21, 2002:
1.226 miod 675: A buffer overflow can occur in the kadmind(8) daemon, leading
676: to possible remote crash or exploit.</a>
1.294 david 677: <li><a href="errata30.html#kerntime">October 7, 2002:
1.223 miod 678: Incorrect argument checking in the setitimer(2) system call
679: may allow an attacker to write to kernel memory.</a>
1.294 david 680: <li><a href="errata30.html#scarg">August 11, 2002:
1.220 miod 681: An insufficient boundary check in the select and poll system calls
682: allows an attacker to overwrite kernel memory and execute arbitrary code
683: in kernel context.</a>
1.294 david 684: <li><a href="errata30.html#ssl">July 30, 2002:
1.218 miod 685: Several remote buffer overflows can occur in the SSL2 server and SSL3
686: client of the ssl(8) library, as in the ASN.1 parser code in the
687: crypto(3) library, all of them being potentially remotely
688: exploitable.</a>
1.294 david 689: <li><a href="errata30.html#xdr">July 29, 2002:
1.218 miod 690: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
691: possible remote crash.</a>
1.294 david 692: <li><a href="errata30.html#pppd">July 29, 2002:
1.218 miod 693: A race condition exists in the pppd(8) daemon which may cause it to
694: alter the file permissions of an arbitrary file.</a>
1.294 david 695: <li><a href="errata30.html#isakmpd2">July 5, 2002:
1.218 miod 696: Receiving IKE payloads out of sequence can cause isakmpd(8) to
697: crash.</a>
1.294 david 698: <li><a href="errata30.html#ktrace">June 27, 2002:
1.215 miod 699: The kernel would let any user ktrace set[ug]id processes.</a>
1.294 david 700: <li><a href="errata30.html#resolver">June 25, 2002:
1.212 millert 701: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 702: <li><a href="errata30.html#sshdauth">June 24, 2002:
1.216 deraadt 703: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 704: input validation error that can result in an integer overflow and
705: privilege escalation.</a>
1.294 david 706: <li><a href="errata30.html#modssl">June 24, 2002:
1.213 miod 707: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 708: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.294 david 709: <li><a href="errata30.html#httpd">June 19, 2002:
1.213 miod 710: A buffer overflow can occur during the interpretation of chunked
711: encoding in httpd(8), leading to possible remote crash.</a>
1.294 david 712: <li><a href="errata30.html#fdalloc2">May 8, 2002:
1.208 millert 713: A race condition exists that could defeat the kernel's
714: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 715: <li><a href="errata30.html#sudo2">April 25, 2002:
1.205 millert 716: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 717: <li><a href="errata30.html#sshafs">April 22, 2002:
1.205 millert 718: A local user can gain super-user privileges due to a buffer
719: overflow in sshd(8) if AFS has been configured on the system
720: or if KerberosTgtPassing or AFSTokenPassing has been enabled
721: in the sshd_config file.</a>
1.294 david 722: <li><a href="errata30.html#mail">April 11, 2002:
1.202 millert 723: The mail(1) was interpreting tilde escapes even when invoked
724: in non-interactive mode. As mail(1) is called as root from cron,
725: this can lead to a local root compromise.</a>
1.294 david 726: <li><a href="errata30.html#approval">March 19, 2002:
1.201 millert 727: Under certain conditions, on systems using YP with netgroups in
728: the password database, it is possible for the rexecd(8) and rshd(8)
729: daemons to execute a shell from a password database entry for a
730: different user. Similarly, atrun(8) may change to the wrong
731: home directory when running jobs.</a>
1.294 david 732: <li><a href="errata30.html#zlib">March 13, 2002:
1.200 millert 733: A potential double free() exists in the zlib library;
734: this is not exploitable on OpenBSD.
735: The kernel also contains a copy of zlib; it is not
736: currently known if the kernel zlib is exploitable.</a>
1.294 david 737: <li><a href="errata30.html#openssh">March 8, 2002:
1.198 millert 738: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 739: may allow a local user to gain super-user privileges.</a>
1.294 david 740: <li><a href="errata30.html#ptrace">January 21, 2002:
1.192 jason 741: A race condition between the ptrace(2) and execve(2) system calls
742: allows an attacker to modify the memory contents of suid/sgid
743: processes which could lead to compromise of the super-user account.</a>
1.294 david 744: <li><a href="errata30.html#sudo">January 17, 2002:
1.191 millert 745: There is a security hole in sudo(8) that can be exploited
746: when the Postfix sendmail replacement is installed that may
747: allow an attacker on the local host to gain root privileges.</a>
1.294 david 748: <li><a href="errata30.html#lpd">November 28, 2001:
1.189 millert 749: An attacker can trick a machine running the lpd daemon into
750: creating new files in the root directory from a machine with
751: remote line printer access.</a>
1.294 david 752: <li><a href="errata30.html#vi.recover">November 13, 2001:
1.188 millert 753: The vi.recover script can be abused in such a way as
754: to cause arbitrary zero-length files to be removed.</a>
1.294 david 755: <li><a href="errata30.html#pf">November 13, 2001:
1.190 mpech 756: pf(4) was incapable of dealing with certain ipv6 icmp packets,
757: resulting in a crash.</a>
1.294 david 758: <li><a href="errata30.html#sshd">November 12, 2001:
1.190 mpech 759: A security hole that may allow an attacker to partially authenticate
760: if -- and only if -- the administrator has enabled KerberosV.</a>
1.187 deraadt 761: </ul>
762:
763: <p>
764: <li>
1.288 matthieu 765: <a name="29"></a>
1.173 deraadt 766:
1.294 david 767: <h3><font color="#e00000">OpenBSD 2.9 Security Advisories</font></h3>
1.173 deraadt 768: These are the OpenBSD 2.9 advisories -- all these problems are solved
1.294 david 769: in <a href="anoncvs.html">OpenBSD current</a>. The
770: <a href="stable.html">patch branch</a>. for 2.9 is no longer being maintained,
1.258 beck 771: you should update your machine.
772:
1.173 deraadt 773:
774: <p>
775: <ul>
1.294 david 776: <li><a href="errata29.html#resolver">June 25, 2002:
1.212 millert 777: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 778: <li><a href="errata29.html#fdalloc2">May 8, 2002:
1.208 millert 779: A race condition exists that could defeat the kernel's
780: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 781: <li><a href="errata29.html#sudo2">April 25, 2002:
1.207 millert 782: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 783: <li><a href="errata29.html#sshafs">April 22, 2002:
1.206 millert 784: A local user can gain super-user privileges due to a buffer
785: overflow in sshd(8) if AFS has been configured on the system
786: or if KerberosTgtPassing or AFSTokenPassing has been enabled
787: in the sshd_config file.</a>
1.294 david 788: <li><a href="errata29.html#mail">April 11, 2002:
1.202 millert 789: The mail(1) was interpreting tilde escapes even when invoked
790: in non-interactive mode. As mail(1) is called as root from cron,
791: this can lead to a local root compromise.</a>
1.294 david 792: <li><a href="errata29.html#zlib">March 13, 2002:
1.200 millert 793: A potential double free() exists in the zlib library;
794: this is not exploitable on OpenBSD.
795: The kernel also contains a copy of zlib; it is not
796: currently known if the kernel zlib is exploitable.</a>
1.294 david 797: <li><a href="errata29.html#openssh">March 8, 2002:
1.198 millert 798: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 799: may allow a local user to gain super-user privileges.</a>
1.294 david 800: <li><a href="errata29.html#ptrace">January 21, 2002:
1.198 millert 801: A race condition between the ptrace(2) and execve(2) system calls
802: allows an attacker to modify the memory contents of suid/sgid
803: processes which could lead to compromise of the super-user account.</a>
1.294 david 804: <li><a href="errata29.html#sudo">January 17, 2002:
1.191 millert 805: There is a security hole in sudo(8) that can be exploited
806: when the Postfix sendmail replacement is installed that may
807: allow an attacker on the local host to gain root privileges.</a>
1.294 david 808: <li><a href="errata29.html#lpd2">November 28, 2001:
1.189 millert 809: An attacker can trick a machine running the lpd daemon into
810: creating new files in the root directory from a machine with
811: remote line printer access.</a>
1.294 david 812: <li><a href="errata29.html#vi.recover">November 13, 2001:
1.190 mpech 813: The vi.recover script can be abused in such a way as
814: to cause arbitrary zero-length files to be removed.</a>
1.294 david 815: <li><a href="errata29.html#uucp">September 11, 2001:
1.184 millert 816: A security hole exists in uuxqt(8) that may allow an
817: attacker to gain root privileges.</a>
1.294 david 818: <li><a href="errata29.html#lpd">August 29, 2001:
1.183 millert 819: A security hole exists in lpd(8) that may allow an
820: attacker to gain root privileges if lpd is running.</a>
1.294 david 821: <li><a href="errata29.html#sendmail2">August 21, 2001:
1.181 millert 822: A security hole exists in sendmail(8) that may allow an
823: attacker on the local host to gain root privileges.</a>
1.294 david 824: <li><a href="errata29.html#nfs">July 30, 2001:
1.180 jason 825: A kernel buffer overflow in the NFS code can be used to execute
826: arbitrary code by users with mount privileges (only root by
1.181 millert 827: default).</a>
1.294 david 828: <li><a href="errata29.html#kernexec">June 15, 2001:
1.178 aaron 829: A race condition in the kernel can lead to local root compromise.</a>
1.294 david 830: <li><a href="errata29.html#sshcookie">June 12, 2001:
1.177 markus 831: sshd(8) allows users to delete arbitrary files named "cookies"
832: if X11 forwarding is enabled. X11 forwarding is disabled
833: by default.</a>
1.294 david 834: <li><a href="errata29.html#fts">May 30, 2001:
1.176 millert 835: Programs using the fts routines can be tricked into changing
836: into the wrong directory.</a>
1.294 david 837: <li><a href="errata29.html#sendmail">May 29, 2001:
1.174 millert 838: Sendmail signal handlers contain unsafe code,
839: leading to numerous race conditions.</a>
1.173 deraadt 840: </ul>
841:
842: <p>
843: <li>
1.288 matthieu 844: <a name="28"></a>
1.152 deraadt 845:
1.294 david 846: <h3><font color="#e00000">OpenBSD 2.8 Security Advisories</font></h3>
1.152 deraadt 847: These are the OpenBSD 2.8 advisories -- all these problems are solved
1.294 david 848: in <a href="anoncvs.html">OpenBSD current</a>. The
849: <a href="stable.html">patch branch</a>. for 2.8 is no longer being maintained,
1.258 beck 850: you should update your machine.
851:
1.152 deraadt 852:
853: <p>
854: <ul>
1.294 david 855: <li><a href="errata28.html#uucp">September 11, 2001:
1.184 millert 856: A security hole exists in uuxqt(8) that may allow an
857: attacker to gain root privileges.</a>
1.294 david 858: <li><a href="errata28.html#lpd">August 29, 2001:
1.183 millert 859: A security hole exists in lpd(8) that may allow an
860: attacker to gain root privileges if lpd is running.</a>
1.294 david 861: <li><a href="errata28.html#sendmail2">August 21, 2001:
1.181 millert 862: A security hole exists in sendmail(8) that may allow an
863: attacker on the local host to gain root privileges.</a>
1.294 david 864: <li><a href="errata28.html#kernexec">June 15, 2001:
1.178 aaron 865: A race condition in the kernel can lead to local root compromise.</a>
1.294 david 866: <li><a href="errata28.html#fts">May 30, 2001:
1.176 millert 867: Programs using the fts routines can be tricked into changing
868: into the wrong directory.</a>
1.294 david 869: <li><a href="errata28.html#sendmail">May 29, 2001:
1.175 millert 870: Sendmail signal handlers contain unsafe code,
871: leading to numerous race conditions.</a>
1.294 david 872: <li><a href="errata28.html#ipf_frag">Apr 23, 2001:
1.231 mickey 873: IPF contains a serious bug with its handling of fragment caching.</a>
1.294 david 874: <li><a href="errata28.html#glob_limit">Apr 23, 2001:
1.172 ericj 875: ftpd(8) contains a potential DoS relating to glob(3).</a>
1.294 david 876: <li><a href="errata28.html#glob">Apr 10, 2001:
1.170 ericj 877: The glob(3) library call contains multiple buffer overflows.</a>
1.294 david 878: <li><a href="errata28.html#readline">Mar 18, 2001:
1.169 millert 879: The readline library creates history files with permissive modes based on the user's umask.</a>
1.294 david 880: <li><a href="errata28.html#ipsec_ah">Mar 2, 2001:
1.167 ericj 881: Insufficient checks in the IPSEC AH IPv4 option handling code can lead to a buffer overrun in the kernel.</a>
1.294 david 882: <li><a href="errata28.html#userldt">Mar 2, 2001:
1.168 horacio 883: The <b>USER_LDT</b> kernel option allows an attacker to gain access to privileged areas of kernel memory.</a>
1.294 david 884: <li><a href="errata28.html#sudo">Feb 22, 2001:
1.171 millert 885: a non-exploitable buffer overflow was fixed in sudo(8).</a>
1.294 david 886: <li><a href="errata28.html#named">Jan 29, 2001:
1.163 jason 887: merge named(8) with ISC BIND 4.9.8-REL, which fixes some buffer vulnerabilities.</a>
1.294 david 888: <li><a href="errata28.html#rnd">Jan 22, 2001:
1.162 jason 889: rnd(4) did not use all of its input when written to.</a>
1.294 david 890: <li><a href="errata28.html#xlock">Dec 22, 2000:
1.159 ericj 891: xlock(1)'s authentication was re-done to authenticate via a named pipe. (patch and new xlock binaries included).</a>
1.294 david 892: <li><a href="errata28.html#procfs">Dec 18, 2000:
1.157 ericj 893: Procfs contains numerous overflows. Procfs is not used by default in OpenBSD. (patch included).</a>
1.294 david 894: <li><a href="errata28.html#kerberos2">Dec 10, 2000:
1.156 deraadt 895: Another problem exists in KerberosIV libraries (patch included).</a>
1.294 david 896: <li><a href="errata28.html#kerberos">Dec 7, 2000:
1.155 deraadt 897: A set of problems in KerberosIV exist (patch included).</a>
1.294 david 898: <li><a href="errata28.html#ftpd">Dec 4, 2000:
1.154 millert 899: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.152 deraadt 900: </ul>
901:
902: <p>
903: <li>
1.288 matthieu 904: <a name="27"></a>
1.124 deraadt 905:
1.294 david 906: <h3><font color="#e00000">OpenBSD 2.7 Security Advisories</font></h3>
1.124 deraadt 907: These are the OpenBSD 2.7 advisories -- all these problems are solved
1.294 david 908: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.124 deraadt 909: OpenBSD 2.6 advisories listed below are fixed in OpenBSD 2.7.
910:
911: <p>
912: <ul>
1.294 david 913: <li><a href="errata27.html#readline">Mar 18, 2001:
1.169 millert 914: The readline library creates history files with permissive modes based on the user's umask.</a>
1.294 david 915: <li><a href="errata27.html#sudo">Feb 22, 2001:
1.169 millert 916: a buffer overflow was fixed in sudo(8).</a>
1.294 david 917: <li><a href="errata27.html#ftpd">Dec 4, 2000:
1.154 millert 918: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.294 david 919: <li><a href="errata27.html#sshforwarding">Nov 10, 2000:
1.152 deraadt 920: Hostile servers can force OpenSSH clients to do agent or X11 forwarding.
921: (patch included)</a>
1.294 david 922: <li><a href="errata27.html#xtrans">Oct 26, 2000:
1.151 matthieu 923: X11 libraries have 2 potential overflows in xtrans code.
924: (patch included)</a>
1.294 david 925: <li><a href="errata27.html#httpd">Oct 18, 2000:
1.150 beck 926: Apache mod_rewrite and mod_vhost_alias modules could expose files
927: on the server in certain configurations if used.
928: (patch included)</a>
1.294 david 929: <li><a href="errata27.html#telnetd">Oct 10, 2000:
1.149 millert 930: The telnet daemon does not strip out the TERMINFO, TERMINFO_DIRS,
931: TERMPATH and TERMCAP environment variables as it should.
932: (patch included)</a>
1.294 david 933: <li><a href="errata27.html#format_strings">Oct 6, 2000:
1.148 millert 934: There are printf-style format string bugs in several privileged
935: programs. (patch included)</a>
1.294 david 936: <li><a href="errata27.html#curses">Oct 6, 2000:
1.147 millert 937: libcurses honored terminal descriptions in the $HOME/.terminfo
938: directory as well as in the TERMCAP environment variable for
939: setuid and setgid applications.
1.146 deraadt 940: (patch included)</a>
1.294 david 941: <li><a href="errata27.html#talkd">Oct 6, 2000:
1.146 deraadt 942: A format string vulnerability exists in talkd(8).
943: (patch included)</a>
1.294 david 944: <li><a href="errata27.html#pw_error">Oct 3, 2000:
1.145 aaron 945: A format string vulnerability exists in the pw_error() function of the
946: libutil library, yielding localhost root through chpass(1).
947: (patch included)</a>
1.294 david 948: <li><a href="errata27.html#ipsec">Sep 18, 2000:
1.144 jason 949: Bad ESP/AH packets could cause a crash under certain conditions.
950: (patch included)</a>
1.294 david 951: <li><a href="errata27.html#xlock">Aug 16, 2000:
1.141 deraadt 952: A format string vulnerability (localhost root) exists in xlock(1).
953: (patch included)</a>
1.294 david 954: <li><a href="errata27.html#X11_libs">July 14, 2000:
1.139 deraadt 955: Various bugs found in X11 libraries have various side effects, almost
956: completely denial of service in OpenBSD.
957: (patch included)</a>
1.294 david 958: <li><a href="errata27.html#ftpd">July 5, 2000:
1.136 deraadt 959: Just like pretty much all the other unix ftp daemons
960: on the planet, ftpd had a remote root hole in it.
961: Luckily, ftpd was not enabled by default.
1.137 deraadt 962: The problem exists if anonymous ftp is enabled.
1.136 deraadt 963: (patch included)</a>
1.294 david 964: <li><a href="errata27.html#mopd">July 5, 2000:
1.136 deraadt 965: Mopd, very rarely used, contained some buffer overflows.
966: (patch included)</a>
1.294 david 967: <li><a href="errata27.html#libedit">June 28, 2000:
1.135 deraadt 968: libedit would check for a <b>.editrc</b> file in the current
969: directory. Not known to be a real security issue, but a patch
970: is available anyways.
971: (patch included)</a>
1.294 david 972: <li><a href="errata27.html#dhclient">June 24, 2000:
1.134 deraadt 973: A serious bug in dhclient(8) could allow strings from a
974: malicious dhcp server to be executed in the shell as root.
975: (patch included)</a>
1.294 david 976: <li><a href="errata27.html#isakmpd">June 9, 2000:
1.133 deraadt 977: A serious bug in isakmpd(8) policy handling wherein
978: policy verification could be completely bypassed in isakmpd.
979: (patch included)</a>
1.294 david 980: <li><a href="errata27.html#uselogin">June 6, 2000:
1.132 deraadt 981: The non-default flag UseLogin in <b>/etc/sshd_config</b> is broken,
982: should not be used, and results in security problems on
983: other operating systems.</a>
1.294 david 984: <li><a href="errata27.html#bridge">May 26, 2000:
1.129 deraadt 985: The bridge(4) <i>learning</i> flag may be bypassed.
1.128 deraadt 986: (patch included)</a>
1.294 david 987: <li><a href="errata27.html#ipf">May 25, 2000:
1.127 kjell 988: Improper use of ipf <i>keep-state</i> rules can result
989: in firewall rules being bypassed. (patch included)</a>
990:
1.124 deraadt 991: </ul>
992:
993: <p>
994: <li>
1.288 matthieu 995: <a name="26"></a>
1.119 deraadt 996:
1.294 david 997: <h3><font color="#e00000">OpenBSD 2.6 Security Advisories</font></h3>
1.119 deraadt 998: These are the OpenBSD 2.6 advisories -- all these problems are solved
1.294 david 999: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.119 deraadt 1000: OpenBSD 2.5 advisories listed below are fixed in OpenBSD 2.6.
1001:
1002: <p>
1003: <ul>
1.294 david 1004: <li><a href="errata26.html#semconfig">May 26, 2000:
1.130 deraadt 1005: SYSV semaphore support contained an undocumented system call
1.131 deraadt 1006: which could wedge semaphore-using processes from exiting. (patch included)</a>
1.294 david 1007: <li><a href="errata26.html#ipf">May 25, 2000:
1.127 kjell 1008: Improper use of ipf <i>keep-state</i> rules can result
1009: in firewall rules being bypassed. (patch included)</a>
1.294 david 1010: <li><a href="errata26.html#xlockmore">May 25, 2000:
1.125 deraadt 1011: xlockmore has a bug which a localhost attacker can use to gain
1012: access to the encrypted root password hash (which is normally
1.245 miod 1013: encoded using blowfish</a> (see
1.294 david 1014: <a href="http://www.openbsd.org/cgi-bin/man.cgi?query=crypt&sektion=3">
1.125 deraadt 1015: crypt(3)</a>)
1.245 miod 1016: (patch included).
1.294 david 1017: <li><a href="errata26.html#procfs">Jan 20, 2000:
1.123 deraadt 1018: Systems running with procfs enabled and mounted are
1019: vulnerable to a very tricky exploit. procfs is not
1020: mounted by default.
1021: (patch included).</a>
1.294 david 1022: <li><a href="errata26.html#sendmail">Dec 4, 1999:
1.296 david 1023: Sendmail permitted any user to cause an aliases file wrap,
1.190 mpech 1024: thus exposing the system to a race where the aliases file
1025: did not exist.
1.119 deraadt 1026: (patch included).</a>
1.294 david 1027: <li><a href="errata26.html#poll">Dec 4, 1999:
1.190 mpech 1028: Various bugs in poll(2) may cause a kernel crash.</a>
1.294 david 1029: <li><a href="errata26.html#sslUSA">Dec 2, 1999:
1.120 deraadt 1030: A buffer overflow in the RSAREF code included in the
1031: USA version of libssl, is possibly exploitable in
1032: httpd, ssh, or isakmpd, if SSL/RSA features are enabled.
1.124 deraadt 1033: (patch included).<br></a>
1034: <strong>Update:</strong> Turns out that this was not exploitable
1035: in any of the software included in OpenBSD 2.6.
1.294 david 1036: <li><a href="errata26.html#ifmedia">Nov 9, 1999:
1.190 mpech 1037: Any user could change interface media configurations, resulting in
1038: a localhost denial of service attack.
1.121 deraadt 1039: (patch included).</a>
1.119 deraadt 1040: </ul>
1041:
1042: <p>
1043: <li>
1.288 matthieu 1044: <a name="25"></a>
1.106 deraadt 1045:
1.294 david 1046: <h3><font color="#e00000">OpenBSD 2.5 Security Advisories</font></h3>
1.93 deraadt 1047: These are the OpenBSD 2.5 advisories -- all these problems are solved
1.294 david 1048: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.93 deraadt 1049: OpenBSD 2.4 advisories listed below are fixed in OpenBSD 2.5.
1050:
1.96 deraadt 1051: <p>
1.104 deraadt 1052: <ul>
1.294 david 1053: <li><a href="errata25.html#cron">Aug 30, 1999:
1.103 deraadt 1054: In cron(8), make sure argv[] is NULL terminated in the
1055: fake popen() and run sendmail as the user, not as root.
1056: (patch included).</a>
1.294 david 1057: <li><a href="errata25.html#miscfs">Aug 12, 1999: The procfs and fdescfs
1.101 deraadt 1058: filesystems had an overrun in their handling of uio_offset
1059: in their readdir() routines. (These filesystems are not
1060: enabled by default). (patch included).</a>
1.294 david 1061: <li><a href="errata25.html#profil">Aug 9, 1999: Stop profiling (see profil(2))
1.100 deraadt 1062: when we execve() a new process. (patch included).</a>
1.294 david 1063: <li><a href="errata25.html#ipsec_in_use">Aug 6, 1999: Packets that should have
1.98 deraadt 1064: been handled by IPsec may be transmitted as cleartext.
1065: PF_KEY SA expirations may leak kernel resources.
1066: (patch included).</a>
1.294 david 1067: <li><a href="errata25.html#rc">Aug 5, 1999: In /etc/rc, use mktemp(1) for
1.97 deraadt 1068: motd re-writing and change the find(1) to use -execdir
1069: (patch included).</a>
1.294 david 1070: <li><a href="errata25.html#chflags">Jul 30, 1999: Do not permit regular
1.95 deraadt 1071: users to chflags(2) or fchflags(2) on character or block devices
1072: which they may currently be the owner of (patch included).</a>
1.294 david 1073: <li><a href="errata25.html#nroff">Jul 27, 1999: Cause groff(1) to be invoked
1.95 deraadt 1074: with the -S flag, when called by nroff(1) (patch included).</a>
1.93 deraadt 1075: </ul>
1076:
1.106 deraadt 1077: <p>
1078: <li>
1.288 matthieu 1079: <a name="24"></a>
1.235 miod 1080:
1.294 david 1081: <h3><font color="#e00000">OpenBSD 2.4 Security Advisories</font></h3>
1.75 deraadt 1082: These are the OpenBSD 2.4 advisories -- all these problems are solved
1.294 david 1083: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.75 deraadt 1084: OpenBSD 2.3 advisories listed below are fixed in OpenBSD 2.4.
1085:
1.96 deraadt 1086: <p>
1.75 deraadt 1087: <ul>
1.294 david 1088: <li><a href="errata24.html#poll">Mar 22, 1999: The nfds argument for poll(2) needs
1.91 deraadt 1089: to be constrained, to avoid kvm starvation (patch included).</a>
1.294 david 1090: <li><a href="errata24.html#tss">Mar 21, 1999: A change in TSS handling stops
1.91 deraadt 1091: another kernel crash case caused by the <strong>crashme</strong>
1092: program (patch included).</a>
1.294 david 1093: <li><a href="errata24.html#nlink">Feb 25, 1999: An unbounded increment on the
1.90 deraadt 1094: nlink value in FFS and EXT2FS filesystems can cause a system crash.
1.89 deraadt 1095: (patch included).</a>
1.294 david 1096: <li><a href="errata24.html#ping">Feb 23, 1999: Yet another buffer overflow
1.88 deraadt 1097: existed in ping(8). (patch included).</a>
1.294 david 1098: <li><a href="errata24.html#ipqrace">Feb 19, 1999: ipintr() had a race in use of
1.87 deraadt 1099: the ipq, which could permit an attacker to cause a crash.
1100: (patch included).</a>
1.294 david 1101: <li><a href="errata24.html#accept">Feb 17, 1999: A race condition in the
1.86 deraadt 1102: kernel between accept(2) and select(2) could permit an attacker
1103: to hang sockets from remote.
1104: (patch included).</a>
1.294 david 1105: <li><a href="errata24.html#maxqueue">Feb 17, 1999: IP fragment assembly can
1.85 deraadt 1106: bog the machine excessively and cause problems.
1107: (patch included).</a>
1.294 david 1108: <li><a href="errata24.html#trctrap">Feb 12, 1999: i386 T_TRCTRAP handling and
1.84 deraadt 1109: DDB interacted to possibly cause a crash.
1110: (patch included).</a>
1.294 david 1111: <li><a href="errata24.html#rst">Feb 11, 1999: TCP/IP RST handling was sloppy.
1.83 deraadt 1112: (patch included).</a>
1.294 david 1113: <li><a href="errata24.html#bootpd">Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 1114: problem in bootpd(8). (patch included).</a>
1.294 david 1115: <li><a href="errata24.html#termcap">Nov 19, 1998: There is a possibly locally
1.82 deraadt 1116: exploitable problem relating to environment variables in termcap
1117: and curses. (patch included).</a>
1.294 david 1118: <li><a href="errata24.html#tcpfix">Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 1119: bug in the TCP decoding kernel. (patch included).</a>
1.75 deraadt 1120: </ul>
1121:
1.106 deraadt 1122: <p>
1123: <li>
1.288 matthieu 1124: <a name="23"></a>
1.235 miod 1125:
1.294 david 1126: <h3><font color="#e00000">OpenBSD 2.3 Security Advisories</font></h3>
1.73 deraadt 1127: These are the OpenBSD 2.3 advisories -- all these problems are solved
1.294 david 1128: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.73 deraadt 1129: OpenBSD 2.2 advisories listed below are fixed in OpenBSD 2.3.
1.53 matthieu 1130:
1.96 deraadt 1131: <p>
1.53 matthieu 1132: <ul>
1.294 david 1133: <li><a href="errata23.html#bootpd">Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 1134: problem in bootpd(8). (patch included).</a>
1.294 david 1135: <li><a href="errata23.html#tcpfix">Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 1136: bug in the TCP decoding kernel. (patch included).</a>
1.294 david 1137: <li><a href="errata23.html#resolver">August 31, 1998: A benign looking resolver
1.190 mpech 1138: buffer overflow bug was re-introduced accidentally (patches included).</a>
1.294 david 1139: <li><a href="errata23.html#chpass">Aug 2, 1998:
1.190 mpech 1140: chpass(1) has a file descriptor leak which allows an
1141: attacker to modify /etc/master.passwd.</a>
1.294 david 1142: <li><a href="errata23.html#inetd">July 15, 1998: Inetd had a file descriptor leak.</a>
1143: <li><a href="errata23.html#fdalloc">Jul 2, 1998: setuid and setgid processes
1.72 deraadt 1144: should not be executed with fd slots 0, 1, or 2 free.
1145: (patch included).</a>
1.294 david 1146: <li><a href="errata23.html#xlib">June 6, 1998: Further problems with the X
1.71 deraadt 1147: libraries (patches included).</a>
1.294 david 1148: <li><a href="errata23.html#kill">May 17, 1998: kill(2) of setuid/setgid target
1.66 deraadt 1149: processes too permissive (4th revision patch included).</a>
1.294 david 1150: <li><a href="errata23.html#immutable">May 11, 1998: mmap() permits partial bypassing
1.60 deraadt 1151: of immutable and append-only file flags. (patch included).</a>
1.294 david 1152: <li><a href="errata23.html#ipsec">May 5, 1998: Incorrect handling of IPSEC packets
1.190 mpech 1153: if IPSEC is enabled (patch included).</a>
1.294 david 1154: <li><a href="errata23.html#xterm-xaw">May 1, 1998: Buffer overflow in xterm and Xaw
1.58 deraadt 1155: (CERT advisory VB-98.04) (patch included).</a>
1.53 matthieu 1156: </ul>
1.9 deraadt 1157:
1.106 deraadt 1158: <p>
1159: <li>
1.288 matthieu 1160: <a name="22"></a>
1.235 miod 1161:
1.294 david 1162: <h3><font color="#e00000">OpenBSD 2.2 Security Advisories</font></h3>
1.45 deraadt 1163: These are the OpenBSD 2.2 advisories. All these problems are solved
1.294 david 1164: in <a href="23.html">OpenBSD 2.3</a>. Some of these problems
1.45 deraadt 1165: still exist in other operating systems. (The supplied patches are for
1166: OpenBSD 2.2; they may or may not work on OpenBSD 2.1).
1.9 deraadt 1167:
1.96 deraadt 1168: <p>
1.9 deraadt 1169: <ul>
1.294 david 1170: <li><a href="errata22.html#ipsec">May 5, 1998: Incorrect handling of IPSEC
1.72 deraadt 1171: packets if IPSEC is enabled (patch included).</a>
1.294 david 1172: <li><a href="errata22.html#xterm-xaw">May 1, 1998: Buffer overflow in xterm
1.72 deraadt 1173: and Xaw (CERT advisory VB-98.04) (patch included).</a>
1.294 david 1174: <li><a href="errata22.html#uucpd">Apr 22, 1998: Buffer overflow in uucpd
1.72 deraadt 1175: (patch included).</a>
1.294 david 1176: <li><a href="errata22.html#rmjob">Apr 22, 1998: Buffer mismanagement in lprm
1.72 deraadt 1177: (patch included).</a>
1.294 david 1178: <li><a href="errata22.html#ping">Mar 31, 1998: Overflow in ping -R (patch included).</a>
1179: <li><a href="errata22.html#named">Mar 30, 1998: Overflow in named fake-iquery
1.59 deraadt 1180: (patch included).</a>
1.294 david 1181: <li><a href="errata22.html#mountd">Mar 2, 1998: Accidental NFS filesystem
1.72 deraadt 1182: export (patch included).</a>
1.112 philen 1183: <li><a href="advisories/mmap.txt">Feb 26, 1998: Read-write mmap() flaw.</a>
1.294 david 1184: Revision 3 of the patch is available <a href="errata22.html#mmap">here</a>
1.112 philen 1185: <li><a href="advisories/sourceroute.txt">Feb 19, 1998: Sourcerouted Packet
1.59 deraadt 1186: Acceptance.</a>
1.294 david 1187: A patch is available <a href="errata22.html#sourceroute">here</a>.
1188: <li><a href="errata22.html#ruserok">Feb 13, 1998: Setuid coredump & Ruserok()
1.72 deraadt 1189: flaw (patch included).</a>
1.294 david 1190: <li><a href="errata22.html#ldso">Feb 9, 1998: MIPS ld.so flaw (patch included).</a>
1.1 deraadt 1191: </ul>
1192:
1.106 deraadt 1193: <p>
1194: <li>
1.288 matthieu 1195: <a name="21"></a>
1.235 miod 1196:
1.294 david 1197: <h3><font color="#e00000">OpenBSD 2.1 Security Advisories</font></h3>
1.52 deraadt 1198: These are the OpenBSD 2.1 advisories. All these problems are solved
1.294 david 1199: in <a href="22.html">OpenBSD 2.2</a>. Some of these problems still
1.52 deraadt 1200: exist in other operating systems. (If you are running OpenBSD 2.1, we
1201: would strongly recommend an upgrade to the newest release, as this
1202: patch list only attempts at fixing the most important security
1203: problems. In particular, OpenBSD 2.2 fixes numerous localhost
1204: security problems. Many of those problems were solved in ways which
1205: make it hard for us to provide patches).
1206:
1.96 deraadt 1207: <p>
1.52 deraadt 1208: <ul>
1.112 philen 1209: <li><a href="advisories/signals.txt">Sep 15, 1997: Deviant Signals (patch included)</a>
1210: <li><a href="advisories/rfork.txt">Aug 2, 1997: Rfork() system call flaw
1.59 deraadt 1211: (patch included)</a>
1.112 philen 1212: <li><a href="advisories/procfs.txt">Jun 24, 1997: Procfs flaws (patch included)</a>
1.52 deraadt 1213: </ul>
1.51 deraadt 1214:
1.106 deraadt 1215: <p>
1216: <li>
1.288 matthieu 1217: <a name="20"></a>
1.235 miod 1218:
1.294 david 1219: <h3><font color="#e00000">OpenBSD 2.0 Security Advisories</font></h3>
1.99 deraadt 1220: These are the OpenBSD 2.0 advisories. All these problems are solved
1.294 david 1221: in <a href="21.html">OpenBSD 2.1</a>. Some of these problems still
1.99 deraadt 1222: exist in other operating systems. (If you are running OpenBSD 2.0, we
1223: commend you for being there back in the old days!, but you're really
1224: missing out if you don't install a new version!)
1225:
1226: <p>
1227: <ul>
1.112 philen 1228: <li><a href="advisories/res_random.txt">April 22, 1997: Predictable IDs in the
1.99 deraadt 1229: resolver (patch included)</a>
1230: <li>Many others... if people can hunt them down, please let me know
1231: and we'll put them up here.
1232: </ul>
1.51 deraadt 1233: <p>
1.106 deraadt 1234:
1.288 matthieu 1235: <a name="watching"></a>
1.294 david 1236: <li><h3><font color="#e00000">Watching our Changes</font></h3><p>
1.106 deraadt 1237:
1.21 deraadt 1238: Since we take a proactive stance with security, we are continually
1239: finding and fixing new security problems. Not all of these problems
1.80 espie 1240: get widely reported because (as stated earlier) many of them are not
1.45 deraadt 1241: confirmed to be exploitable; many simple bugs we fix do turn out to
1242: have security consequences we could not predict. We do not have the
1243: time resources to make these changes available in the above format.<p>
1.21 deraadt 1244:
1245: Thus there are usually minor security fixes in the current source code
1246: beyond the previous major OpenBSD release. We make a limited
1.45 deraadt 1247: guarantee that these problems are of minimal impact and unproven
1.44 ian 1248: exploitability. If we discover that a problem definitely matters for
1.45 deraadt 1249: security, patches will show up here <strong>VERY</strong> quickly.<p>
1.21 deraadt 1250:
1.45 deraadt 1251: People who are really concerned with security can do a number of
1252: things:<p>
1.21 deraadt 1253:
1254: <ul>
1255: <li>If you understand security issues, watch our
1.294 david 1256: <a href="mail.html">source-changes mailing list</a> and keep an
1.23 deraadt 1257: eye out for things which appear security related. Since
1.21 deraadt 1258: exploitability is not proven for many of the fixes we make,
1259: do not expect the relevant commit message to say "SECURITY FIX!".
1260: If a problem is proven and serious, a patch will be available
1261: here very shortly after.
1.161 horacio 1262: <li>In addition to source changes, you can watch our <a href="mail.html">
1.160 ericj 1263: security-announce mailing list</a> which will notify you for every
1.186 ian 1264: security related item that the OpenBSD team deems as a possible threat,
1.160 ericj 1265: and instruct you on how to patch the problem.
1.21 deraadt 1266: <li>Track our current source code tree, and teach yourself how to do a
1.29 deraadt 1267: complete system build from time to time (read /usr/src/Makefile
1268: carefully). Users can make the assumption that the current
1269: source tree always has stronger security than the previous release.
1.45 deraadt 1270: However, building your own system from source code is not trivial;
1.265 miod 1271: it is nearly 600MB of source code, and problems do occur as we
1.45 deraadt 1272: transition between major releases.
1.115 ericj 1273: <li>Install a binary snapshot for your
1.80 espie 1274: architecture, which are made available fairly often. For
1.29 deraadt 1275: instance, an i386 snapshot is typically made available weekly.
1.21 deraadt 1276: </ul>
1277:
1.9 deraadt 1278: <p>
1.288 matthieu 1279: <a name="reporting"></a>
1.294 david 1280: <li><h3><font color="#e00000">Reporting problems</font></h3><p>
1.3 deraadt 1281:
1.5 deraadt 1282: <p> If you find a new security problem, you can mail it to
1.294 david 1283: <a href="mailto:deraadt@openbsd.org">deraadt@openbsd.org</a>.
1.7 deraadt 1284: <br>
1.5 deraadt 1285: If you wish to PGP encode it (but please only do so if privacy is very
1.112 philen 1286: urgent, since it is inconvenient) use this <a href="advisories/pgpkey.txt">pgp key</a>.
1.5 deraadt 1287:
1.107 deraadt 1288: <p>
1.288 matthieu 1289: <a name="papers"></a>
1.294 david 1290: <li><h3><font color="#e00000">Further Reading</font></h3><p>
1.107 deraadt 1291:
1292: A number of papers have been written by OpenBSD team members, about security
1293: related changes they have done in OpenBSD. The postscript versions of these
1.108 deraadt 1294: documents are available as follows.<p>
1.107 deraadt 1295:
1296: <ul>
1.113 deraadt 1297: <li>A Future-Adaptable Password Scheme.<br>
1.294 david 1298: <a href="events.html#usenix99">Usenix 1999</a>,
1299: by <a href="mailto:provos@openbsd.org">Niels Provos</a>,
1300: <a href="mailto:dm@openbsd.org">David Mazieres</a>.<br>
1301: <a href="papers/bcrypt-paper.ps">paper</a> and
1302: <a href="papers/bcrypt-slides.ps">slides</a>.
1.113 deraadt 1303: <p>
1304: <li>Cryptography in OpenBSD: An Overview.<br>
1.294 david 1305: <a href="events.html#usenix99">Usenix 1999</a>,
1306: by <a href="mailto:deraadt@openbsd.org">Theo de Raadt</a>,
1307: <a href="mailto:niklas@openbsd.org">Niklas Hallqvist</a>,
1308: <a href="mailto:art@openbsd.org">Artur Grabowski</a>,
1309: <a href="mailto:angelos@openbsd.org">Angelos D. Keromytis</a>,
1310: <a href="mailto:provos@openbsd.org">Niels Provos</a>.<br>
1311: <a href="papers/crypt-paper.ps">paper</a> and
1312: <a href="papers/crypt-slides.ps">slides</a>.
1.113 deraadt 1313: <p>
1314: <li>strlcpy and strlcat -- consistent, safe, string copy and concatenation.<br>
1.294 david 1315: <a href="events.html#usenix99">Usenix 1999</a>,
1316: by <a href="mailto:millert@openbsd.org">Todd C. Miller</a>,
1317: <a href="mailto:deraadt@openbsd.org">Theo de Raadt</a>.<br>
1318: <a href="papers/strlcpy-paper.ps">paper</a> and
1319: <a href="papers/strlcpy-slides.ps">slides</a>.
1.113 deraadt 1320: <p>
1.118 deraadt 1321: <li>Dealing with Public Ethernet Jacks-Switches, Gateways, and Authentication.<br>
1.294 david 1322: <a href="events.html#lisa99">LISA 1999</a>,
1323: by <a href="mailto:beck@openbsd.org">Bob Beck</a>.<br>
1324: <a href="papers/authgw-paper.ps">paper</a> and
1325: <a href="papers/authgw-slides.ps">slides</a>.
1.118 deraadt 1326: <p>
1.153 jufi 1327: <li>Encrypting Virtual Memory<br>
1.294 david 1328: <a href="events.html#sec2000">Usenix Security 2000</a>,
1329: <a href="mailto:provos@openbsd.org">Niels Provos</a>.<br>
1330: <a href="papers/swapencrypt.ps">paper</a> and
1331: <a href="papers/swapencrypt-slides.ps">slides</a>.
1.142 deraadt 1332: <p>
1.107 deraadt 1333: </ul>
1.294 david 1334: </ul>
1.106 deraadt 1335:
1.2 deraadt 1336: <hr>
1.294 david 1337: <a href="index.html"><img height=24 width=24 src="back.gif" border=0 alt="OpenBSD"></a>
1338: <a href="mailto:www@openbsd.org">www@openbsd.org</a>
1.24 deraadt 1339: <br>
1.310 ! brad 1340: <small>$OpenBSD: security.html,v 1.309 2005/03/30 17:18:51 brad Exp $</small>
1.1 deraadt 1341:
1.24 deraadt 1342: </body>
1343: </html>
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