Annotation of www/security.html, Revision 1.284
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1.274 david 13: <body bgcolor="#ffffff" text="#000000" link="#23238E">
1.210 jsyn 14: <a href="index.html"><img alt="[OpenBSD]" height="30" width="141" src="images/smalltitle.gif" border="0"></a>
1.106 deraadt 15: <p>
1.110 deraadt 16: <h2><font color=#e00000>Security</font><hr></h2>
1.1 deraadt 17:
1.114 philen 18: <table width="100%">
19: <tr>
20: <td colspan="2">
21: <strong>Index</strong>
22: </td>
23: </tr>
24: <tr>
25: <td valign="top">
1.106 deraadt 26: <a href=#goals>Security goals of the Project</a>.<br>
27: <a href=#disclosure>Full Disclosure policy</a>.<br>
28: <a href=#process>Source code auditing process</a>.<br>
1.111 aaron 29: <a href=#default>"Secure by Default"</a>.<br>
1.106 deraadt 30: <a href=#crypto>Use of Cryptography</a>.<br>
31: <p>
32: <a href=#watching>Watching changes</a>.<br>
33: <a href=#reporting>Reporting security issues</a>.<br>
1.107 deraadt 34: <a href=#papers>Further Reading</a><br>
1.106 deraadt 35: <p>
1.114 philen 36: </td>
37: <td valign="top">
1.225 deraadt 38: For security advisories for specific releases, click below:<br>
39: <a href="#20">2.0</a>,
40: <a href="#21">2.1</a>,
41: <a href="#22">2.2</a>,
42: <a href="#23">2.3</a>,
43: <a href="#24">2.4</a>,
44: <a href="#25">2.5</a>,
45: <a href="#26">2.6</a>,
46: <a href="#27">2.7</a>,
47: <a href="#28">2.8</a>,
48: <a href="#29">2.9</a>,
49: <a href="#30">3.0</a>,
50: <a href="#31">3.1</a>,
1.246 deraadt 51: <a href="#32">3.2</a>,
1.261 david 52: <a href="#33">3.3</a>,
1.280 david 53: <a href="#34">3.4</a>,
54: <a href="#35">3.5</a>.
1.114 philen 55: </td>
56: </tr>
57: </table>
1.56 deraadt 58: <hr>
59:
1.278 deraadt 60: <ul>
1.106 deraadt 61: <a name=goals></a>
1.110 deraadt 62: <li><h3><font color=#e00000>Goal</font></h3><p>
1.22 deraadt 63:
1.14 deraadt 64: OpenBSD believes in strong security. Our aspiration is to be NUMBER
1.22 deraadt 65: ONE in the industry for security (if we are not already there). Our
66: open software development model permits us to take a more
67: uncompromising view towards increased security than Sun, SGI, IBM, HP,
68: or other vendors are able to. We can make changes the vendors would
1.27 deraadt 69: not make. Also, since OpenBSD is exported with <a href=crypto.html>
1.45 deraadt 70: cryptography</a>, we are able to take cryptographic approaches towards
71: fixing security problems.<p>
1.18 deraadt 72:
1.106 deraadt 73: <a name=disclosure></a>
1.110 deraadt 74: <li><h3><font color=#e00000>Full Disclosure</font></h3><p>
1.106 deraadt 75:
1.45 deraadt 76: Like many readers of the
1.196 jufi 77: <a href="http://online.securityfocus.com/archive/1">
1.18 deraadt 78: BUGTRAQ mailing list</a>,
1.106 deraadt 79: we believe in full disclosure of security problems. In the
80: operating system arena, we were probably the first to embrace
81: the concept. Many vendors, even of free software, still try
82: to hide issues from their users.<p>
83:
84: Security information moves very fast in cracker circles. On the other
85: hand, our experience is that coding and releasing of proper security
86: fixes typically requires about an hour of work -- very fast fix
87: turnaround is possible. Thus we think that full disclosure helps the
88: people who really care about security.<p>
89:
1.153 jufi 90: <a name=process></a>
1.110 deraadt 91: <li><h3><font color=#e00000>Audit Process</font></h3><p>
1.15 deraadt 92:
1.12 deraadt 93: Our security auditing team typically has between six and twelve
1.45 deraadt 94: members who continue to search for and fix new security holes. We
95: have been auditing since the summer of 1996. The process we follow to
96: increase security is simply a comprehensive file-by-file analysis of
1.106 deraadt 97: every critical software component. We are not so much looking for
98: security holes, as we are looking for basic software bugs, and if
1.138 deraadt 99: years later someone discovers the problem used to be a security
1.106 deraadt 100: issue, and we fixed it because it was just a bug, well, all the
101: better. Flaws have been found in just about every area of the system.
102: Entire new classes of security problems have been found during our
103: audit, and often source code which had been audited earlier needs
104: re-auditing with these new flaws in mind. Code often gets audited
105: multiple times, and by multiple people with different auditing
106: skills.<p>
1.12 deraadt 107:
1.94 deraadt 108: Some members of our security auditing team worked for Secure Networks,
109: the company that made the industry's premier network security scanning
110: software package Ballista (Secure Networks got purchased by Network
111: Associates, Ballista got renamed to Cybercop Scanner, and well...)
112: That company did a lot of security research, and thus fit in well
1.106 deraadt 113: with the OpenBSD stance. OpenBSD passed Ballista's tests with flying
114: colours since day 1.<p>
1.31 deraadt 115:
1.34 deraadt 116: Another facet of our security auditing process is its proactiveness.
1.45 deraadt 117: In most cases we have found that the determination of exploitability
118: is not an issue. During our ongoing auditing process we find many
119: bugs, and endeavor to fix them even though exploitability is not
120: proven. We fix the bug, and we move on to find other bugs to fix. We
121: have fixed many simple and obvious careless programming errors in code
122: and only months later discovered that the problems were in fact
123: exploitable. (Or, more likely someone on
1.197 jufi 124: <a href="http://online.securityfocus.com/archive/1">BUGTRAQ</a>
1.45 deraadt 125: would report that other operating systems were vulnerable to a `newly
126: discovered problem', and then it would be discovered that OpenBSD had
127: been fixed in a previous release). In other cases we have been saved
128: from full exploitability of complex step-by-step attacks because we
129: had fixed one of the intermediate steps. An example of where we
1.94 deraadt 130: managed such a success is the lpd advisory that Secure Networks put out.
131: <p>
1.29 deraadt 132:
1.278 deraadt 133: <a name=newtech></a>
134: <li><h3><font color=#e00000>New Technologies</font></h3><p>
135:
136: As we audit source code, we often invent new ways of solving problems.
137: Sometimes these ideas have been used before in some random application
138: written somewhere, but perhaps not taken to the degree that we do.
139: <p>
140:
141: <ul>
142: <li>strlcpy() and strlcat()
143: <li>Memory protection purify
144: <ul>
145: <li>W^X
146: <li>.rodata segment
147: <li>Guard pages
148: <li>Randomized malloc()
149: <li>Randomized mmap()
150: <li>atexit() and stdio protection
151: </ul>
152: <li>Privilege seperation
153: <li>Privilege revocation
154: <li>Chroot jailing
155: <li>New uids
156: <li>ProPolice
157: <li>... and others
158: </ul>
159: <p>
160:
1.110 deraadt 161: <li><h3><font color=#e00000>The Reward</font></h3><p>
1.106 deraadt 162:
1.45 deraadt 163: Our proactive auditing process has really paid off. Statements like
1.35 deraadt 164: ``This problem was fixed in OpenBSD about 6 months ago'' have become
1.45 deraadt 165: commonplace in security forums like
1.197 jufi 166: <a href="http://online.securityfocus.com/archive/1">BUGTRAQ</a>.<p>
1.35 deraadt 167:
1.45 deraadt 168: The most intense part of our security auditing happened immediately
1.80 espie 169: before the OpenBSD 2.0 release and during the 2.0->2.1 transition,
1.45 deraadt 170: over the last third of 1996 and first half of 1997. Thousands (yes,
171: thousands) of security issues were fixed rapidly over this year-long
172: period; bugs like the standard buffer overflows, protocol
173: implementation weaknesses, information gathering, and filesystem
174: races. Hence most of the security problems that we encountered were
175: fixed before our 2.1 release, and then a far smaller number needed
176: fixing for our 2.2 release. We do not find as many problems anymore,
177: it is simply a case of diminishing returns. Recently the security
178: problems we find and fix tend to be significantly more obscure or
179: complicated. Still we will persist for a number of reasons:<p>
1.36 deraadt 180:
1.35 deraadt 181: <ul>
1.45 deraadt 182: <li>Occasionally we find a simple problem we missed earlier. Doh!
1.35 deraadt 183: <li>Security is like an arms race; the best attackers will continue
1.45 deraadt 184: to search for more complicated exploits, so we will too.
185: <li>Finding and fixing subtle flaws in complicated software is
186: a lot of fun.
1.35 deraadt 187: </ul>
1.106 deraadt 188: <p>
1.15 deraadt 189:
1.14 deraadt 190: The auditing process is not over yet, and as you can see we continue
1.28 deraadt 191: to find and fix new security flaws.<p>
1.12 deraadt 192:
1.106 deraadt 193: <a name=default></a>
1.110 deraadt 194: <li><h3><font color=#e00000>"Secure by Default"</font></h3><p>
1.106 deraadt 195:
196: To ensure that novice users of OpenBSD do not need to become security
197: experts overnight (a viewpoint which other vendors seem to have), we
198: ship the operating system in a Secure by Default mode. All non-essential
199: services are disabled. As the user/administrator becomes more familiar
200: with the system, he will discover that he has to enable daemons and other
201: parts of the system. During the process of learning how to enable a new
202: service, the novice is more likely to learn of security considerations.<p>
203:
204: This is in stark contrast to the increasing number of systems that
205: ship with NFS, mountd, web servers, and various other services enabled
206: by default, creating instantaneous security problems for their users
207: within minutes after their first install.<p>
208:
1.153 jufi 209: <a name=crypto></a>
1.110 deraadt 210: <li><h3><font color=#e00000>Cryptography</font></h3><p>
1.106 deraadt 211:
212: And of course, since the OpenBSD project is based in Canada, it is possible
213: for us to integrate cryptography. For more information, read the page
1.116 deraadt 214: outlining <a href=crypto.html>what we have done with cryptography</a>.</p>
1.106 deraadt 215:
1.110 deraadt 216: <li><h3><font color=#e00000>Advisories</font></h3><p>
1.106 deraadt 217:
218: <li>
1.279 deraadt 219: <a name=35></a>
220:
221: <h3><font color=#e00000>OpenBSD 3.5 Security Advisories</font></h3>
222: These are the OpenBSD 3.5 advisories -- all these problems are solved
223: in <a href=anoncvs.html>OpenBSD current</a> and the
224: <a href=stable.html>patch branch</a>.
225:
226: <p>
227: <ul>
1.282 tedu 228: <li><a href=errata.html#procfs> May 13, 2004:
229: Integer overflow problems were found in procfs, allowing
230: reading of arbitrary kernel memory.</a>
1.281 otto 231: <li><a href=errata.html#cvs> May 5, 2004:
232: Pathname validation problems have been found in cvs(1),
233: allowing clients and servers access to files outside the
234: repository or local CVS tree.</a>
1.279 deraadt 235: </ul>
236:
237: <p>
238: <li>
1.261 david 239: <a name=34></a>
240:
241: <h3><font color=#e00000>OpenBSD 3.4 Security Advisories</font></h3>
242: These are the OpenBSD 3.4 advisories -- all these problems are solved
243: in <a href=anoncvs.html>OpenBSD current</a> and the
244: <a href=stable.html>patch branch</a>.
245:
246: <p>
247: <ul>
1.283 brad 248: <li><a href=errata34.html#procfs> May 13, 2004:
1.282 tedu 249: Integer overflow problems were found in procfs, allowing
250: reading of arbitrary kernel memory.</a>
1.281 otto 251: <li><a href=errata34.html#cvs> May 5, 2004:
252: Pathname validation problems have been found in cvs(1),
253: allowing clients and servers access to files outside the
254: repository or local CVS tree.</a>
1.279 deraadt 255: <li><a href=errata34.html#openssl> March 17, 2004:
1.277 millert 256: A missing check for a NULL-pointer dereference may allow a
1.281 otto 257: remote attacker to crash applications using OpenSSL.</a>
1.279 deraadt 258: <li><a href=errata34.html#isakmpd2> March 17, 2004:
1.276 brad 259: Defects in the payload validation and processing functions of
260: isakmpd have been discovered. An attacker could send malformed
261: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.279 deraadt 262: <li><a href=errata34.html#httpd2> March 13, 2004:
1.275 brad 263: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
264: access module, using IP addresses without a netmask on big endian
265: 64-bit platforms causes the rules to fail to match.</a>
1.279 deraadt 266: <li><a href=errata34.html#ip6> February 8, 2004:
1.272 dhartmei 267: An IPv6 MTU handling problem exists that could be used by an
268: attacker to cause a denial of service attack.</a>
1.279 deraadt 269: <li><a href=errata34.html#sysvshm> February 5, 2004:
1.271 millert 270: A reference counting bug in shmat(2) could be used to write to
271: kernel memory under certain circumstances.</a>
1.279 deraadt 272: <li><a href=errata34.html#isakmpd>January 13, 2004:
1.266 brad 273: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 274: by Thomas Walpuski.</a>
1.279 deraadt 275: <li><a href=errata34.html#ibcs2>November 17, 2003:
1.264 henning 276: It may be possible for a local user to overrun the stack in
277: compat_ibcs2(8) and cause a kernel panic.</a>
1.279 deraadt 278: <li><a href=errata34.html#asn1>November 1, 2003:
1.262 margarid 279: The use of certain ASN.1 encodings or malformed public keys may
280: allow an attacker to mount a denial of service attack against
281: applications linked with ssl(3).</a>
1.261 david 282: </ul>
283:
284: <p>
1.284 ! otto 285: OpenBSD 3.3 and earlier releases are not supported anymore. The following
! 286: paragraphs only list advisories issued while they were maintained; these
! 287: releases are likely to be affected by the advisories for more recent releases.
! 288: <br>
! 289:
1.261 david 290: <li>
1.246 deraadt 291: <a name=33></a>
292:
293: <h3><font color=#e00000>OpenBSD 3.3 Security Advisories</font></h3>
294: These are the OpenBSD 3.3 advisories -- all these problems are solved
295: in <a href=anoncvs.html>OpenBSD current</a> and the
1.284 ! otto 296: in <a href=anoncvs.html>OpenBSD current</a>. The
! 297: <a href=stable.html>patch branch</a> for 3.3 is no longer being maintained,
! 298: you should update your machine.
1.246 deraadt 299: <p>
300: <ul>
1.281 otto 301: <li><a href=errata33.html#cvs> May 5, 2004:
302: Pathname validation problems have been found in cvs(1),
303: allowing clients and servers access to files outside the
304: repository or local CVS tree.</a>
1.277 millert 305: <li><a href=errata33.html#openssl> March 17, 2004:
306: A missing check for a NULL-pointer dereference may allow a
1.281 otto 307: remote attacker to crash applications using OpenSSL.</a>
1.276 brad 308: <li><a href=errata33.html#isakmpd2> March 17, 2004:
309: Defects in the payload validation and processing functions of
310: isakmpd have been discovered. An attacker could send malformed
311: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.275 brad 312: <li><a href=errata33.html#httpd2> March 13, 2004:
313: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
314: access module, using IP addresses without a netmask on big endian
315: 64-bit platforms causes the rules to fail to match.</a>
316: <li><a href=errata33.html#ip6> February 8, 2004:
317: An IPv6 MTU handling problem exists that could be used by an
318: attacker to cause a denial of service attack.</a>
1.271 millert 319: <li><a href=errata33.html#sysvshm> February 5, 2004:
320: A reference counting bug in shmat(2) could be used to write to
321: kernel memory under certain circumstances.</a>
1.270 jose 322: <li><a href=errata33.html#isakmpd>January 15, 2004:
1.268 brad 323: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 324: by Thomas Walpuski.</a>
1.264 henning 325: <li><a href=errata33.html#ibcs2>November 17, 2003:
326: It may be possible for a local user to execute arbitrary code
327: resulting in escalation of privileges due to a stack overrun
328: in compat_ibcs2(8).</a>
1.261 david 329: <li><a href=errata33.html#asn1>October 1, 2003:
1.257 millert 330: The use of certain ASN.1 encodings or malformed public keys may
331: allow an attacker to mount a denial of service attack against
332: applications linked with ssl(3).</a>
1.261 david 333: <li><a href=errata33.html#pfnorm>September 24, 2003:
1.258 beck 334: Access of freed memory in pf(4) could be used to
1.260 margarid 335: remotely panic a machine using scrub rules.</a>
1.261 david 336: <li><a href=errata33.html#sendmail>September 17, 2003:
1.256 millert 337: A buffer overflow in the address parsing in
338: sendmail(8) may allow an attacker to gain root privileges.</a>
1.261 david 339: <li><a href=errata33.html#sshbuffer>September 16, 2003:
1.255 millert 340: OpenSSH versions prior to 3.7 contains a buffer management error
341: that is potentially exploitable.</a>
1.261 david 342: <li><a href=errata33.html#sysvsem>September 10, 2003:
1.254 millert 343: Root may be able to reduce the security level by taking advantage of
344: an integer overflow when the semaphore limits are made very large.</a>
1.261 david 345: <li><a href=errata33.html#semget>August 20, 2003:
1.252 millert 346: An improper bounds check in the kernel may allow a local user
347: to panic the kernel.</a>
1.261 david 348: <li><a href=errata33.html#realpath>August 4, 2003:
1.249 millert 349: An off-by-one error exists in the C library function realpath(3)
350: may allow an attacker to gain escalated privileges.</a>
1.246 deraadt 351: </ul>
352:
1.265 miod 353:
1.247 david 354: <p>
1.246 deraadt 355: <li>
1.224 deraadt 356: <a name=32></a>
357:
358: <h3><font color=#e00000>OpenBSD 3.2 Security Advisories</font></h3>
359: These are the OpenBSD 3.2 advisories -- all these problems are solved
1.265 miod 360: in <a href=anoncvs.html>OpenBSD current</a>. The
361: <a href=stable.html>patch branch</a> for 3.2 is no longer being maintained,
362: you should update your machine.
1.224 deraadt 363: <p>
364: <ul>
1.257 millert 365: <li><a href=errata32.html#asn1>October 1, 2003:
366: The use of certain ASN.1 encodings or malformed public keys may
367: allow an attacker to mount a denial of service attack against
368: applications linked with ssl(3). This does not affect OpenSSH.</a>
1.259 margarid 369: <li><a href=errata32.html#pfnorm>September 24, 2003:
1.258 beck 370: Access of freed memory in pf(4) could be used to
1.260 margarid 371: remotely panic a machine using scrub rules.</a>
1.256 millert 372: <li><a href=errata32.html#sendmail4>September 17, 2003:
373: A buffer overflow in the address parsing in
374: sendmail(8) may allow an attacker to gain root privileges.</a>
1.255 millert 375: <li><a href=errata32.html#sshbuffer>September 16, 2003:
376: OpenSSH versions prior to 3.7 contains a buffer management error
377: that is potentially exploitable.</a>
1.253 brad 378: <li><a href=errata32.html#sendmail3>August 25, 2003:
379: Fix for a potential security issue in
380: sendmail(8) with respect to DNS maps.</a>
1.249 millert 381: <li><a href=errata32.html#realpath>August 4, 2003:
382: An off-by-one error exists in the C library function realpath(3)
383: may allow an attacker to gain escalated privileges.</a>
1.244 miod 384: <li><a href=errata32.html#sendmail2>March 31, 2003:
385: A buffer overflow in the address parsing in
386: sendmail(8) may allow an attacker to gain root privileges.</a>
1.243 deraadt 387: <li><a href=errata32.html#kerberos>March 24, 2003:
1.242 millert 388: A cryptographic weaknesses in the Kerberos v4 protocol can be
389: exploited on Kerberos v5 as well.</a>
1.243 deraadt 390: <li><a href=errata32.html#kpr>March 19, 2003:
1.241 jufi 391: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 392: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.243 deraadt 393: <li><a href=errata32.html#blinding>March 18, 2003:
1.239 miod 394: Various SSL and TLS operations in OpenSSL are vulnerable to
395: timing attacks.</a>
1.243 deraadt 396: <li><a href=errata32.html#lprm>March 5, 2003:
1.238 millert 397: A buffer overflow in lprm(1) may allow an attacker to elevate
398: privileges to user daemon.</a>.
1.243 deraadt 399: <li><a href=errata32.html#sendmail>March 3, 2003:
1.237 miod 400: A buffer overflow in the envelope comments processing in
401: sendmail(8) may allow an attacker to gain root privileges.</a>
1.243 deraadt 402: <li><a href=errata32.html#httpd>February 25, 2003:
1.236 margarid 403: httpd(8) leaks file inode numbers via ETag header as well as
404: child PIDs in multipart MIME boundary generation. This could
405: lead, for example, to NFS exploitation because it uses inode
406: numbers as part of the file handle.</a>
1.243 deraadt 407: <li><a href=errata32.html#ssl>February 22, 2003:
1.234 margarid 408: In ssl(8) an information leak can occur via timing by performing
409: a MAC computation even if incorrect block cipher padding has
410: been found, this is a countermeasure. Also, check for negative
411: sizes, in allocation routines.</a>
1.243 deraadt 412: <li><a href=errata32.html#cvs>January 20, 2003:
1.232 millert 413: A double free exists in cvs(1) that could lead to privilege
414: escalation for cvs configurations where the cvs command is
1.233 margarid 415: run as a privileged user.</a>
1.243 deraadt 416: <li><a href=errata32.html#named>November 14, 2002:
1.230 millert 417: A buffer overflow exists in named(8) that could lead to a
418: remote crash or code execution as user named in a chroot jail.</a>
1.243 deraadt 419: <li><a href=errata32.html#pool>November 6, 2002:
1.233 margarid 420: A logic error in the pool kernel memory allocator could cause
421: memory corruption in low-memory situations, causing the system
422: to crash.</a>
1.243 deraadt 423: <li><a href=errata32.html#smrsh>November 6, 2002:
1.229 miod 424: An attacker can bypass smrsh(8)'s restrictions and execute
425: arbitrary commands with the privileges of his own account.</a>
1.243 deraadt 426: <li><a href=errata32.html#pfbridge>November 6, 2002:
1.233 margarid 427: Network bridges running pf with scrubbing enabled could cause
428: mbuf corruption, causing the system to crash.</a>
1.243 deraadt 429: <li><a href=errata32.html#kadmin>October 21, 2002:
1.228 miod 430: A buffer overflow can occur in the kadmind(8) daemon, leading
431: to possible remote crash or exploit.</a>
1.224 deraadt 432: </ul>
433:
1.227 miod 434: <p>
435: <li>
1.203 deraadt 436: <a name=31></a>
437:
438: <h3><font color=#e00000>OpenBSD 3.1 Security Advisories</font></h3>
439: These are the OpenBSD 3.1 advisories -- all these problems are solved
1.258 beck 440: in <a href=anoncvs.html>OpenBSD current</a>. The
441: <a href=stable.html>patch branch</a> for 3.1 is no longer being maintained,
442: you should update your machine.
1.203 deraadt 443:
444: <p>
445: <ul>
1.244 miod 446: <li><a href=errata31.html#sendmail2>March 31, 2003:
447: A buffer overflow in the address parsing in
448: sendmail(8) may allow an attacker to gain root privileges.</a>
1.242 millert 449: <li><a href=errata31.html#kerberos>March 24, 2003:
450: A cryptographic weaknesses in the Kerberos v4 protocol can be
451: exploited on Kerberos v5 as well.</a>
1.240 miod 452: <li><a href=errata31.html#kpr>March 19, 2003:
1.241 jufi 453: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 454: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.239 miod 455: <li><a href=errata31.html#blinding>March 18, 2003:
456: Various SSL and TLS operations in OpenSSL are vulnerable to
457: timing attacks.</a>
1.238 millert 458: <li><a href=errata31.html#lprm>March 4, 2003:
459: A buffer overflow in lprm(1) may allow an attacker to gain
460: root privileges.</a>
1.237 miod 461: <li><a href=errata31.html#sendmail>March 3, 2003:
462: A buffer overflow in the envelope comments processing in
463: sendmail(8) may allow an attacker to gain root privileges.</a>
1.235 miod 464: <li><a href=errata31.html#ssl2>February 23, 2003:
465: In ssl(8) an information leak can occur via timing by performing
466: a MAC computation even if incorrect block cipher padding has
467: been found, this is a countermeasure. Also, check for negative
468: sizes, in allocation routines.</a>
1.232 millert 469: <li><a href=errata31.html#cvs>January 20, 2003:
470: A double free exists in cvs(1) that could lead to privilege
471: escalation for cvs configurations where the cvs command is
472: run as a privileged user.
1.230 millert 473: <li><a href=errata31.html#named>November 14, 2002:
474: A buffer overflow exists in named(8) that could lead to a
475: remote crash or code execution as user named in a chroot jail.</a>
1.229 miod 476: <li><a href=errata31.html#kernresource>November 6, 2002:
477: Incorrect argument checking in the getitimer(2) system call
478: may allow an attacker to crash the system.</a>
479: <li><a href=errata31.html#smrsh>November 6, 2002:
480: An attacker can bypass smrsh(8)'s restrictions and execute
481: arbitrary commands with the privileges of his own account.</a>
1.226 miod 482: <li><a href=errata31.html#kadmin>October 21, 2002:
483: A buffer overflow can occur in the kadmind(8) daemon, leading
484: to possible remote crash or exploit.</a>
1.224 deraadt 485: <li><a href=errata31.html#kerntime>October 2, 2002:
1.222 jason 486: Incorrect argument checking in the setitimer(2) system call
487: may allow an attacker to write to kernel memory.</a>
1.224 deraadt 488: <li><a href=errata31.html#scarg>August 11, 2002:
1.221 provos 489: An insufficient boundary check in the select system call
1.220 miod 490: allows an attacker to overwrite kernel memory and execute arbitrary code
491: in kernel context.</a>
1.224 deraadt 492: <li><a href=errata31.html#ssl>July 30, 2002:
1.218 miod 493: Several remote buffer overflows can occur in the SSL2 server and SSL3
494: client of the ssl(8) library, as in the ASN.1 parser code in the
495: crypto(3) library, all of them being potentially remotely
496: exploitable.</a>
1.224 deraadt 497: <li><a href=errata31.html#xdr>July 29, 2002:
1.218 miod 498: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
499: possible remote crash.</a>
1.224 deraadt 500: <li><a href=errata31.html#pppd>July 29, 2002:
1.218 miod 501: A race condition exists in the pppd(8) daemon which may cause it to
502: alter the file permissions of an arbitrary file.</a>
1.224 deraadt 503: <li><a href=errata31.html#isakmpd>July 5, 2002:
1.218 miod 504: Receiving IKE payloads out of sequence can cause isakmpd(8) to
505: crash.</a>
1.224 deraadt 506: <li><a href=errata31.html#ktrace>June 27, 2002:
1.215 miod 507: The kernel would let any user ktrace set[ug]id processes.</a>
1.224 deraadt 508: <li><a href=errata31.html#modssl>June 26, 2002:
1.213 miod 509: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 510: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.224 deraadt 511: <li><a href=errata31.html#resolver>June 25, 2002:
1.212 millert 512: A potential buffer overflow in the DNS resolver has been found.</a>
1.224 deraadt 513: <li><a href=errata31.html#sshd>June 24, 2002:
1.216 deraadt 514: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 515: input validation error that can result in an integer overflow and
516: privilege escalation.</a>
1.224 deraadt 517: <li><a href=errata31.html#httpd>June 19, 2002:
1.211 miod 518: A buffer overflow can occur during the interpretation of chunked
519: encoding in httpd(8), leading to possible remote crash.</a>
1.224 deraadt 520: <li><a href=errata31.html#sshbsdauth>May 22, 2002:
1.209 markus 521: Under certain conditions, on systems using YP with netgroups
522: in the password database, it is possible that sshd(8) does
523: ACL checks for the requested user name but uses the password
524: database entry of a different user for authentication. This
525: means that denied users might authenticate successfully
526: while permitted users could be locked out.</a>
1.224 deraadt 527: <li><a href=errata31.html#fdalloc2>May 8, 2002:
1.208 millert 528: A race condition exists that could defeat the kernel's
529: protection of fd slots 0-2 for setuid processes.</a>
1.224 deraadt 530: <li><a href=errata31.html#sudo>April 25, 2002:
1.205 millert 531: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.224 deraadt 532: <li><a href=errata31.html#sshafs>April 22, 2002:
1.205 millert 533: A local user can gain super-user privileges due to a buffer
534: overflow in sshd(8) if AFS has been configured on the system
535: or if KerberosTgtPassing or AFSTokenPassing has been enabled
536: in the sshd_config file.</a>
1.203 deraadt 537: </ul>
538:
1.235 miod 539: <p>
1.203 deraadt 540: <li>
1.187 deraadt 541: <a name=30></a>
542:
543: <h3><font color=#e00000>OpenBSD 3.0 Security Advisories</font></h3>
544: These are the OpenBSD 3.0 advisories -- all these problems are solved
1.258 beck 545: in <a href=anoncvs.html>OpenBSD current</a>. The
546: <a href=stable.html>patch branch</a> for 3.0 is no longer being maintained,
547: you should update your machine.
1.187 deraadt 548:
549: <p>
550: <ul>
1.230 millert 551: <li><a href=errata30.html#named>November 14, 2002:
552: A buffer overflow exists in named(8) that could lead to a
553: remote crash or code execution as user named in a chroot jail.</a>
1.229 miod 554: <li><a href=errata30.html#kernresource>November 6, 2002:
555: Incorrect argument checking in the getitimer(2) system call
556: may allow an attacker to crash the system.</a>
557: <li><a href=errata30.html#smrsh>November 6, 2002:
558: An attacker can bypass smrsh(8)'s restrictions and execute
559: arbitrary commands with the privileges of his own account.</a>
1.226 miod 560: <li><a href=errata30.html#kadmin>October 21, 2002:
561: A buffer overflow can occur in the kadmind(8) daemon, leading
562: to possible remote crash or exploit.</a>
1.223 miod 563: <li><a href=errata30.html#kerntime>October 7, 2002:
564: Incorrect argument checking in the setitimer(2) system call
565: may allow an attacker to write to kernel memory.</a>
1.220 miod 566: <li><a href=errata30.html#scarg>August 11, 2002:
567: An insufficient boundary check in the select and poll system calls
568: allows an attacker to overwrite kernel memory and execute arbitrary code
569: in kernel context.</a>
1.218 miod 570: <li><a href=errata30.html#ssl>July 30, 2002:
571: Several remote buffer overflows can occur in the SSL2 server and SSL3
572: client of the ssl(8) library, as in the ASN.1 parser code in the
573: crypto(3) library, all of them being potentially remotely
574: exploitable.</a>
575: <li><a href=errata30.html#xdr>July 29, 2002:
576: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
577: possible remote crash.</a>
578: <li><a href=errata30.html#pppd>July 29, 2002:
579: A race condition exists in the pppd(8) daemon which may cause it to
580: alter the file permissions of an arbitrary file.</a>
1.219 miod 581: <li><a href=errata30.html#isakmpd2>July 5, 2002:
1.218 miod 582: Receiving IKE payloads out of sequence can cause isakmpd(8) to
583: crash.</a>
1.215 miod 584: <li><a href=errata30.html#ktrace>June 27, 2002:
585: The kernel would let any user ktrace set[ug]id processes.</a>
1.212 millert 586: <li><a href=errata30.html#resolver>June 25, 2002:
587: A potential buffer overflow in the DNS resolver has been found.</a>
1.213 miod 588: <li><a href=errata30.html#sshdauth>June 24, 2002:
1.216 deraadt 589: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 590: input validation error that can result in an integer overflow and
591: privilege escalation.</a>
592: <li><a href=errata30.html#modssl>June 24, 2002:
593: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 594: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.213 miod 595: <li><a href=errata30.html#httpd>June 19, 2002:
596: A buffer overflow can occur during the interpretation of chunked
597: encoding in httpd(8), leading to possible remote crash.</a>
1.208 millert 598: <li><a href=errata30.html#fdalloc2>May 8, 2002:
599: A race condition exists that could defeat the kernel's
600: protection of fd slots 0-2 for setuid processes.</a>
1.205 millert 601: <li><a href=errata30.html#sudo2>April 25, 2002:
602: A bug in sudo may allow an attacker to corrupt the heap.</a>
603: <li><a href=errata30.html#sshafs>April 22, 2002:
604: A local user can gain super-user privileges due to a buffer
605: overflow in sshd(8) if AFS has been configured on the system
606: or if KerberosTgtPassing or AFSTokenPassing has been enabled
607: in the sshd_config file.</a>
1.203 deraadt 608: <li><a href=errata30.html#mail>April 11, 2002:
1.202 millert 609: The mail(1) was interpreting tilde escapes even when invoked
610: in non-interactive mode. As mail(1) is called as root from cron,
611: this can lead to a local root compromise.</a>
1.203 deraadt 612: <li><a href=errata30.html#approval>March 19, 2002:
1.201 millert 613: Under certain conditions, on systems using YP with netgroups in
614: the password database, it is possible for the rexecd(8) and rshd(8)
615: daemons to execute a shell from a password database entry for a
616: different user. Similarly, atrun(8) may change to the wrong
617: home directory when running jobs.</a>
1.203 deraadt 618: <li><a href=errata30.html#zlib>March 13, 2002:
1.200 millert 619: A potential double free() exists in the zlib library;
620: this is not exploitable on OpenBSD.
621: The kernel also contains a copy of zlib; it is not
622: currently known if the kernel zlib is exploitable.</a>
1.203 deraadt 623: <li><a href=errata30.html#openssh>March 8, 2002:
1.198 millert 624: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 625: may allow a local user to gain super-user privileges.</a>
1.203 deraadt 626: <li><a href=errata30.html#ptrace>January 21, 2002:
1.192 jason 627: A race condition between the ptrace(2) and execve(2) system calls
628: allows an attacker to modify the memory contents of suid/sgid
629: processes which could lead to compromise of the super-user account.</a>
1.203 deraadt 630: <li><a href=errata30.html#sudo>January 17, 2002:
1.191 millert 631: There is a security hole in sudo(8) that can be exploited
632: when the Postfix sendmail replacement is installed that may
633: allow an attacker on the local host to gain root privileges.</a>
1.203 deraadt 634: <li><a href=errata30.html#lpd>November 28, 2001:
1.189 millert 635: An attacker can trick a machine running the lpd daemon into
636: creating new files in the root directory from a machine with
637: remote line printer access.</a>
1.203 deraadt 638: <li><a href=errata30.html#vi.recover>November 13, 2001:
1.188 millert 639: The vi.recover script can be abused in such a way as
640: to cause arbitrary zero-length files to be removed.</a>
1.203 deraadt 641: <li><a href=errata30.html#pf>November 13, 2001:
1.190 mpech 642: pf(4) was incapable of dealing with certain ipv6 icmp packets,
643: resulting in a crash.</a>
1.203 deraadt 644: <li><a href=errata30.html#sshd>November 12, 2001:
1.190 mpech 645: A security hole that may allow an attacker to partially authenticate
646: if -- and only if -- the administrator has enabled KerberosV.</a>
1.187 deraadt 647: </ul>
648:
649: <p>
650: <li>
1.173 deraadt 651: <a name=29></a>
652:
653: <h3><font color=#e00000>OpenBSD 2.9 Security Advisories</font></h3>
654: These are the OpenBSD 2.9 advisories -- all these problems are solved
1.258 beck 655: in <a href=anoncvs.html>OpenBSD current</a>. The
656: <a href=stable.html>patch branch</a>. for 2.9 is no longer being maintained,
657: you should update your machine.
658:
1.173 deraadt 659:
660: <p>
661: <ul>
1.212 millert 662: <li><a href=errata29.html#resolver>June 25, 2002:
663: A potential buffer overflow in the DNS resolver has been found.</a>
1.208 millert 664: <li><a href=errata29.html#fdalloc2>May 8, 2002:
665: A race condition exists that could defeat the kernel's
666: protection of fd slots 0-2 for setuid processes.</a>
1.207 millert 667: <li><a href=errata29.html#sudo2>April 25, 2002:
668: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.206 millert 669: <li><a href=errata29.html#sshafs>April 22, 2002:
670: A local user can gain super-user privileges due to a buffer
671: overflow in sshd(8) if AFS has been configured on the system
672: or if KerberosTgtPassing or AFSTokenPassing has been enabled
673: in the sshd_config file.</a>
1.202 millert 674: <li><a href=errata29.html#mail>April 11, 2002:
675: The mail(1) was interpreting tilde escapes even when invoked
676: in non-interactive mode. As mail(1) is called as root from cron,
677: this can lead to a local root compromise.</a>
1.200 millert 678: <li><a href=errata29.html#zlib>March 13, 2002:
679: A potential double free() exists in the zlib library;
680: this is not exploitable on OpenBSD.
681: The kernel also contains a copy of zlib; it is not
682: currently known if the kernel zlib is exploitable.</a>
1.198 millert 683: <li><a href=errata29.html#openssh>March 8, 2002:
684: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 685: may allow a local user to gain super-user privileges.</a>
1.198 millert 686: <li><a href=errata29.html#ptrace>January 21, 2002:
687: A race condition between the ptrace(2) and execve(2) system calls
688: allows an attacker to modify the memory contents of suid/sgid
689: processes which could lead to compromise of the super-user account.</a>
1.191 millert 690: <li><a href=errata29.html#sudo>January 17, 2002:
691: There is a security hole in sudo(8) that can be exploited
692: when the Postfix sendmail replacement is installed that may
693: allow an attacker on the local host to gain root privileges.</a>
1.189 millert 694: <li><a href=errata29.html#lpd2>November 28, 2001:
695: An attacker can trick a machine running the lpd daemon into
696: creating new files in the root directory from a machine with
697: remote line printer access.</a>
1.190 mpech 698: <li><a href=errata29.html#vi.recover>November 13, 2001:
699: The vi.recover script can be abused in such a way as
700: to cause arbitrary zero-length files to be removed.</a>
1.185 deraadt 701: <li><a href=errata29.html#uucp>September 11, 2001:
1.184 millert 702: A security hole exists in uuxqt(8) that may allow an
703: attacker to gain root privileges.</a>
1.185 deraadt 704: <li><a href=errata29.html#lpd>August 29, 2001:
1.183 millert 705: A security hole exists in lpd(8) that may allow an
706: attacker to gain root privileges if lpd is running.</a>
1.185 deraadt 707: <li><a href=errata29.html#sendmail2>August 21, 2001:
1.181 millert 708: A security hole exists in sendmail(8) that may allow an
709: attacker on the local host to gain root privileges.</a>
1.185 deraadt 710: <li><a href=errata29.html#nfs>July 30, 2001:
1.180 jason 711: A kernel buffer overflow in the NFS code can be used to execute
712: arbitrary code by users with mount privileges (only root by
1.181 millert 713: default).</a>
1.185 deraadt 714: <li><a href=errata29.html#kernexec>June 15, 2001:
1.178 aaron 715: A race condition in the kernel can lead to local root compromise.</a>
1.185 deraadt 716: <li><a href=errata29.html#sshcookie>June 12, 2001:
1.177 markus 717: sshd(8) allows users to delete arbitrary files named "cookies"
718: if X11 forwarding is enabled. X11 forwarding is disabled
719: by default.</a>
1.185 deraadt 720: <li><a href=errata29.html#fts>May 30, 2001:
1.176 millert 721: Programs using the fts routines can be tricked into changing
722: into the wrong directory.</a>
1.185 deraadt 723: <li><a href=errata29.html#sendmail>May 29, 2001:
1.174 millert 724: Sendmail signal handlers contain unsafe code,
725: leading to numerous race conditions.</a>
1.173 deraadt 726: </ul>
727:
728: <p>
729: <li>
1.152 deraadt 730: <a name=28></a>
731:
732: <h3><font color=#e00000>OpenBSD 2.8 Security Advisories</font></h3>
733: These are the OpenBSD 2.8 advisories -- all these problems are solved
1.258 beck 734: in <a href=anoncvs.html>OpenBSD current</a>. The
735: <a href=stable.html>patch branch</a>. for 2.8 is no longer being maintained,
736: you should update your machine.
737:
1.152 deraadt 738:
739: <p>
740: <ul>
1.184 millert 741: <li><a href=errata28.html#uucp>September 11, 2001:
742: A security hole exists in uuxqt(8) that may allow an
743: attacker to gain root privileges.</a>
1.183 millert 744: <li><a href=errata28.html#lpd>August 29, 2001:
745: A security hole exists in lpd(8) that may allow an
746: attacker to gain root privileges if lpd is running.</a>
1.181 millert 747: <li><a href=errata28.html#sendmail2>August 21, 2001:
748: A security hole exists in sendmail(8) that may allow an
749: attacker on the local host to gain root privileges.</a>
1.178 aaron 750: <li><a href=errata28.html#kernexec>June 15, 2001:
751: A race condition in the kernel can lead to local root compromise.</a>
1.176 millert 752: <li><a href=errata28.html#fts>May 30, 2001:
753: Programs using the fts routines can be tricked into changing
754: into the wrong directory.</a>
1.175 millert 755: <li><a href=errata28.html#sendmail>May 29, 2001:
756: Sendmail signal handlers contain unsafe code,
757: leading to numerous race conditions.</a>
1.173 deraadt 758: <li><a href=errata28.html#ipf_frag>Apr 23, 2001:
1.231 mickey 759: IPF contains a serious bug with its handling of fragment caching.</a>
1.173 deraadt 760: <li><a href=errata28.html#glob_limit>Apr 23, 2001:
1.172 ericj 761: ftpd(8) contains a potential DoS relating to glob(3).</a>
1.173 deraadt 762: <li><a href=errata28.html#glob>Apr 10, 2001:
1.170 ericj 763: The glob(3) library call contains multiple buffer overflows.</a>
1.173 deraadt 764: <li><a href=errata28.html#readline>Mar 18, 2001:
1.169 millert 765: The readline library creates history files with permissive modes based on the user's umask.</a>
1.173 deraadt 766: <li><a href=errata28.html#ipsec_ah>Mar 2, 2001:
1.167 ericj 767: Insufficient checks in the IPSEC AH IPv4 option handling code can lead to a buffer overrun in the kernel.</a>
1.173 deraadt 768: <li><a href=errata28.html#userldt>Mar 2, 2001:
1.168 horacio 769: The <b>USER_LDT</b> kernel option allows an attacker to gain access to privileged areas of kernel memory.</a>
1.173 deraadt 770: <li><a href=errata28.html#sudo>Feb 22, 2001:
1.171 millert 771: a non-exploitable buffer overflow was fixed in sudo(8).</a>
1.173 deraadt 772: <li><a href=errata28.html#named>Jan 29, 2001:
1.163 jason 773: merge named(8) with ISC BIND 4.9.8-REL, which fixes some buffer vulnerabilities.</a>
1.173 deraadt 774: <li><a href=errata28.html#rnd>Jan 22, 2001:
1.162 jason 775: rnd(4) did not use all of its input when written to.</a>
1.173 deraadt 776: <li><a href=errata28.html#xlock>Dec 22, 2000:
1.159 ericj 777: xlock(1)'s authentication was re-done to authenticate via a named pipe. (patch and new xlock binaries included).</a>
1.173 deraadt 778: <li><a href=errata28.html#procfs>Dec 18, 2000:
1.157 ericj 779: Procfs contains numerous overflows. Procfs is not used by default in OpenBSD. (patch included).</a>
1.173 deraadt 780: <li><a href=errata28.html#kerberos2>Dec 10, 2000:
1.156 deraadt 781: Another problem exists in KerberosIV libraries (patch included).</a>
1.173 deraadt 782: <li><a href=errata28.html#kerberos>Dec 7, 2000:
1.155 deraadt 783: A set of problems in KerberosIV exist (patch included).</a>
1.173 deraadt 784: <li><a href=errata28.html#ftpd>Dec 4, 2000:
1.154 millert 785: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.152 deraadt 786: </ul>
787:
788: <p>
789: <li>
1.124 deraadt 790: <a name=27></a>
791:
792: <h3><font color=#e00000>OpenBSD 2.7 Security Advisories</font></h3>
793: These are the OpenBSD 2.7 advisories -- all these problems are solved
794: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
795: OpenBSD 2.6 advisories listed below are fixed in OpenBSD 2.7.
796:
797: <p>
798: <ul>
1.169 millert 799: <li><a href=errata27.html#readline>Mar 18, 2001:
800: The readline library creates history files with permissive modes based on the user's umask.</a>
801: <li><a href=errata27.html#sudo>Feb 22, 2001:
802: a buffer overflow was fixed in sudo(8).</a>
1.154 millert 803: <li><a href=errata27.html#ftpd>Dec 4, 2000:
804: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.152 deraadt 805: <li><a href=errata27.html#sshforwarding>Nov 10, 2000:
806: Hostile servers can force OpenSSH clients to do agent or X11 forwarding.
807: (patch included)</a>
808: <li><a href=errata27.html#xtrans>Oct 26, 2000:
1.151 matthieu 809: X11 libraries have 2 potential overflows in xtrans code.
810: (patch included)</a>
1.152 deraadt 811: <li><a href=errata27.html#httpd>Oct 18, 2000:
1.150 beck 812: Apache mod_rewrite and mod_vhost_alias modules could expose files
813: on the server in certain configurations if used.
814: (patch included)</a>
1.164 deraadt 815: <li><a href=errata27.html#telnetd>Oct 10, 2000:
1.149 millert 816: The telnet daemon does not strip out the TERMINFO, TERMINFO_DIRS,
817: TERMPATH and TERMCAP environment variables as it should.
818: (patch included)</a>
1.152 deraadt 819: <li><a href=errata27.html#format_strings>Oct 6, 2000:
1.148 millert 820: There are printf-style format string bugs in several privileged
821: programs. (patch included)</a>
1.152 deraadt 822: <li><a href=errata27.html#curses>Oct 6, 2000:
1.147 millert 823: libcurses honored terminal descriptions in the $HOME/.terminfo
824: directory as well as in the TERMCAP environment variable for
825: setuid and setgid applications.
1.146 deraadt 826: (patch included)</a>
1.152 deraadt 827: <li><a href=errata27.html#talkd>Oct 6, 2000:
1.146 deraadt 828: A format string vulnerability exists in talkd(8).
829: (patch included)</a>
1.152 deraadt 830: <li><a href=errata27.html#pw_error>Oct 3, 2000:
1.145 aaron 831: A format string vulnerability exists in the pw_error() function of the
832: libutil library, yielding localhost root through chpass(1).
833: (patch included)</a>
1.152 deraadt 834: <li><a href=errata27.html#ipsec>Sep 18, 2000:
1.144 jason 835: Bad ESP/AH packets could cause a crash under certain conditions.
836: (patch included)</a>
1.152 deraadt 837: <li><a href=errata27.html#xlock>Aug 16, 2000:
1.141 deraadt 838: A format string vulnerability (localhost root) exists in xlock(1).
839: (patch included)</a>
1.152 deraadt 840: <li><a href=errata27.html#X11_libs>July 14, 2000:
1.139 deraadt 841: Various bugs found in X11 libraries have various side effects, almost
842: completely denial of service in OpenBSD.
843: (patch included)</a>
1.152 deraadt 844: <li><a href=errata27.html#ftpd>July 5, 2000:
1.136 deraadt 845: Just like pretty much all the other unix ftp daemons
846: on the planet, ftpd had a remote root hole in it.
847: Luckily, ftpd was not enabled by default.
1.137 deraadt 848: The problem exists if anonymous ftp is enabled.
1.136 deraadt 849: (patch included)</a>
1.152 deraadt 850: <li><a href=errata27.html#mopd>July 5, 2000:
1.136 deraadt 851: Mopd, very rarely used, contained some buffer overflows.
852: (patch included)</a>
1.152 deraadt 853: <li><a href=errata27.html#libedit>June 28, 2000:
1.135 deraadt 854: libedit would check for a <b>.editrc</b> file in the current
855: directory. Not known to be a real security issue, but a patch
856: is available anyways.
857: (patch included)</a>
1.152 deraadt 858: <li><a href=errata27.html#dhclient>June 24, 2000:
1.134 deraadt 859: A serious bug in dhclient(8) could allow strings from a
860: malicious dhcp server to be executed in the shell as root.
861: (patch included)</a>
1.152 deraadt 862: <li><a href=errata27.html#isakmpd>June 9, 2000:
1.133 deraadt 863: A serious bug in isakmpd(8) policy handling wherein
864: policy verification could be completely bypassed in isakmpd.
865: (patch included)</a>
1.152 deraadt 866: <li><a href=errata27.html#uselogin>June 6, 2000:
1.132 deraadt 867: The non-default flag UseLogin in <b>/etc/sshd_config</b> is broken,
868: should not be used, and results in security problems on
869: other operating systems.</a>
1.152 deraadt 870: <li><a href=errata27.html#bridge>May 26, 2000:
1.129 deraadt 871: The bridge(4) <i>learning</i> flag may be bypassed.
1.128 deraadt 872: (patch included)</a>
1.152 deraadt 873: <li><a href=errata27.html#ipf>May 25, 2000:
1.127 kjell 874: Improper use of ipf <i>keep-state</i> rules can result
875: in firewall rules being bypassed. (patch included)</a>
876:
1.124 deraadt 877: </ul>
878:
879: <p>
880: <li>
1.119 deraadt 881: <a name=26></a>
882:
883: <h3><font color=#e00000>OpenBSD 2.6 Security Advisories</font></h3>
884: These are the OpenBSD 2.6 advisories -- all these problems are solved
885: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
886: OpenBSD 2.5 advisories listed below are fixed in OpenBSD 2.6.
887:
888: <p>
889: <ul>
1.130 deraadt 890: <li><a href=errata26.html#semconfig>May 26, 2000:
891: SYSV semaphore support contained an undocumented system call
1.131 deraadt 892: which could wedge semaphore-using processes from exiting. (patch included)</a>
1.127 kjell 893: <li><a href=errata26.html#ipf>May 25, 2000:
894: Improper use of ipf <i>keep-state</i> rules can result
895: in firewall rules being bypassed. (patch included)</a>
1.126 deraadt 896: <li><a href=errata26.html#xlockmore>May 25, 2000:
1.125 deraadt 897: xlockmore has a bug which a localhost attacker can use to gain
898: access to the encrypted root password hash (which is normally
1.245 miod 899: encoded using blowfish</a> (see
1.125 deraadt 900: <a href="http://www.openbsd.org/cgi-bin/man.cgi?query=crypt&sektion=3">
901: crypt(3)</a>)
1.245 miod 902: (patch included).
1.126 deraadt 903: <li><a href=errata26.html#procfs>Jan 20, 2000:
1.123 deraadt 904: Systems running with procfs enabled and mounted are
905: vulnerable to a very tricky exploit. procfs is not
906: mounted by default.
907: (patch included).</a>
1.190 mpech 908: <li><a href=errata26.html#sendmail>Dec 4, 1999:
909: Sendmail permitted any user to cause a aliases file wrap,
910: thus exposing the system to a race where the aliases file
911: did not exist.
1.119 deraadt 912: (patch included).</a>
1.190 mpech 913: <li><a href=errata26.html#poll>Dec 4, 1999:
914: Various bugs in poll(2) may cause a kernel crash.</a>
1.126 deraadt 915: <li><a href=errata26.html#sslUSA>Dec 2, 1999:
1.120 deraadt 916: A buffer overflow in the RSAREF code included in the
917: USA version of libssl, is possibly exploitable in
918: httpd, ssh, or isakmpd, if SSL/RSA features are enabled.
1.124 deraadt 919: (patch included).<br></a>
920: <strong>Update:</strong> Turns out that this was not exploitable
921: in any of the software included in OpenBSD 2.6.
1.190 mpech 922: <li><a href=errata26.html#ifmedia>Nov 9, 1999:
923: Any user could change interface media configurations, resulting in
924: a localhost denial of service attack.
1.121 deraadt 925: (patch included).</a>
1.119 deraadt 926: </ul>
927:
928: <p>
929: <li>
1.93 deraadt 930: <a name=25></a>
1.106 deraadt 931:
1.110 deraadt 932: <h3><font color=#e00000>OpenBSD 2.5 Security Advisories</font></h3>
1.93 deraadt 933: These are the OpenBSD 2.5 advisories -- all these problems are solved
934: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
935: OpenBSD 2.4 advisories listed below are fixed in OpenBSD 2.5.
936:
1.96 deraadt 937: <p>
1.104 deraadt 938: <ul>
1.117 deraadt 939: <li><a href=errata25.html#cron>Aug 30, 1999:
1.103 deraadt 940: In cron(8), make sure argv[] is NULL terminated in the
941: fake popen() and run sendmail as the user, not as root.
942: (patch included).</a>
1.117 deraadt 943: <li><a href=errata25.html#miscfs>Aug 12, 1999: The procfs and fdescfs
1.101 deraadt 944: filesystems had an overrun in their handling of uio_offset
945: in their readdir() routines. (These filesystems are not
946: enabled by default). (patch included).</a>
1.117 deraadt 947: <li><a href=errata25.html#profil>Aug 9, 1999: Stop profiling (see profil(2))
1.100 deraadt 948: when we execve() a new process. (patch included).</a>
1.117 deraadt 949: <li><a href=errata25.html#ipsec_in_use>Aug 6, 1999: Packets that should have
1.98 deraadt 950: been handled by IPsec may be transmitted as cleartext.
951: PF_KEY SA expirations may leak kernel resources.
952: (patch included).</a>
1.117 deraadt 953: <li><a href=errata25.html#rc>Aug 5, 1999: In /etc/rc, use mktemp(1) for
1.97 deraadt 954: motd re-writing and change the find(1) to use -execdir
955: (patch included).</a>
1.117 deraadt 956: <li><a href=errata25.html#chflags>Jul 30, 1999: Do not permit regular
1.95 deraadt 957: users to chflags(2) or fchflags(2) on character or block devices
958: which they may currently be the owner of (patch included).</a>
1.117 deraadt 959: <li><a href=errata25.html#nroff>Jul 27, 1999: Cause groff(1) to be invoked
1.95 deraadt 960: with the -S flag, when called by nroff(1) (patch included).</a>
1.93 deraadt 961: </ul>
962:
1.106 deraadt 963: <p>
964: <li>
1.75 deraadt 965: <a name=24></a>
1.235 miod 966:
1.110 deraadt 967: <h3><font color=#e00000>OpenBSD 2.4 Security Advisories</font></h3>
1.75 deraadt 968: These are the OpenBSD 2.4 advisories -- all these problems are solved
969: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
970: OpenBSD 2.3 advisories listed below are fixed in OpenBSD 2.4.
971:
1.96 deraadt 972: <p>
1.75 deraadt 973: <ul>
1.92 deraadt 974: <li><a href=errata24.html#poll>Mar 22, 1999: The nfds argument for poll(2) needs
1.91 deraadt 975: to be constrained, to avoid kvm starvation (patch included).</a>
1.92 deraadt 976: <li><a href=errata24.html#tss>Mar 21, 1999: A change in TSS handling stops
1.91 deraadt 977: another kernel crash case caused by the <strong>crashme</strong>
978: program (patch included).</a>
1.92 deraadt 979: <li><a href=errata24.html#nlink>Feb 25, 1999: An unbounded increment on the
1.90 deraadt 980: nlink value in FFS and EXT2FS filesystems can cause a system crash.
1.89 deraadt 981: (patch included).</a>
1.92 deraadt 982: <li><a href=errata24.html#ping>Feb 23, 1999: Yet another buffer overflow
1.88 deraadt 983: existed in ping(8). (patch included).</a>
1.92 deraadt 984: <li><a href=errata24.html#ipqrace>Feb 19, 1999: ipintr() had a race in use of
1.87 deraadt 985: the ipq, which could permit an attacker to cause a crash.
986: (patch included).</a>
1.92 deraadt 987: <li><a href=errata24.html#accept>Feb 17, 1999: A race condition in the
1.86 deraadt 988: kernel between accept(2) and select(2) could permit an attacker
989: to hang sockets from remote.
990: (patch included).</a>
1.92 deraadt 991: <li><a href=errata24.html#maxqueue>Feb 17, 1999: IP fragment assembly can
1.85 deraadt 992: bog the machine excessively and cause problems.
993: (patch included).</a>
1.92 deraadt 994: <li><a href=errata24.html#trctrap>Feb 12, 1999: i386 T_TRCTRAP handling and
1.84 deraadt 995: DDB interacted to possibly cause a crash.
996: (patch included).</a>
1.92 deraadt 997: <li><a href=errata24.html#rst>Feb 11, 1999: TCP/IP RST handling was sloppy.
1.83 deraadt 998: (patch included).</a>
1.92 deraadt 999: <li><a href=errata24.html#bootpd>Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 1000: problem in bootpd(8). (patch included).</a>
1.92 deraadt 1001: <li><a href=errata24.html#termcap>Nov 19, 1998: There is a possibly locally
1.82 deraadt 1002: exploitable problem relating to environment variables in termcap
1003: and curses. (patch included).</a>
1.92 deraadt 1004: <li><a href=errata24.html#tcpfix>Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 1005: bug in the TCP decoding kernel. (patch included).</a>
1.75 deraadt 1006: </ul>
1007:
1.106 deraadt 1008: <p>
1009: <li>
1.58 deraadt 1010: <a name=23></a>
1.235 miod 1011:
1.110 deraadt 1012: <h3><font color=#e00000>OpenBSD 2.3 Security Advisories</font></h3>
1.73 deraadt 1013: These are the OpenBSD 2.3 advisories -- all these problems are solved
1014: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
1015: OpenBSD 2.2 advisories listed below are fixed in OpenBSD 2.3.
1.53 matthieu 1016:
1.96 deraadt 1017: <p>
1.53 matthieu 1018: <ul>
1.81 deraadt 1019: <li><a href=errata23.html#bootpd>Nov 27, 1998: There is a remotely exploitable
1020: problem in bootpd(8). (patch included).</a>
1.78 deraadt 1021: <li><a href=errata23.html#tcpfix>Nov 13, 1998: There is a remote machine lockup
1022: bug in the TCP decoding kernel. (patch included).</a>
1.190 mpech 1023: <li><a href=errata23.html#resolver>August 31, 1998: A benign looking resolver
1024: buffer overflow bug was re-introduced accidentally (patches included).</a>
1025: <li><a href=errata23.html#chpass>Aug 2, 1998:
1026: chpass(1) has a file descriptor leak which allows an
1027: attacker to modify /etc/master.passwd.</a>
1028: <li><a href=errata23.html#inetd>July 15, 1998: Inetd had a file descriptor leak.</a>
1.76 aaron 1029: <li><a href=errata23.html#fdalloc>Jul 2, 1998: setuid and setgid processes
1.72 deraadt 1030: should not be executed with fd slots 0, 1, or 2 free.
1031: (patch included).</a>
1.76 aaron 1032: <li><a href=errata23.html#xlib>June 6, 1998: Further problems with the X
1.71 deraadt 1033: libraries (patches included).</a>
1.76 aaron 1034: <li><a href=errata23.html#kill>May 17, 1998: kill(2) of setuid/setgid target
1.66 deraadt 1035: processes too permissive (4th revision patch included).</a>
1.76 aaron 1036: <li><a href=errata23.html#immutable>May 11, 1998: mmap() permits partial bypassing
1.60 deraadt 1037: of immutable and append-only file flags. (patch included).</a>
1.190 mpech 1038: <li><a href=errata23.html#ipsec>May 5, 1998: Incorrect handling of IPSEC packets
1039: if IPSEC is enabled (patch included).</a>
1.76 aaron 1040: <li><a href=errata23.html#xterm-xaw>May 1, 1998: Buffer overflow in xterm and Xaw
1.58 deraadt 1041: (CERT advisory VB-98.04) (patch included).</a>
1.53 matthieu 1042: </ul>
1.9 deraadt 1043:
1.106 deraadt 1044: <p>
1045: <li>
1.58 deraadt 1046: <a name=22></a>
1.235 miod 1047:
1.110 deraadt 1048: <h3><font color=#e00000>OpenBSD 2.2 Security Advisories</font></h3>
1.45 deraadt 1049: These are the OpenBSD 2.2 advisories. All these problems are solved
1.55 deraadt 1050: in <a href=23.html>OpenBSD 2.3</a>. Some of these problems
1.45 deraadt 1051: still exist in other operating systems. (The supplied patches are for
1052: OpenBSD 2.2; they may or may not work on OpenBSD 2.1).
1.9 deraadt 1053:
1.96 deraadt 1054: <p>
1.9 deraadt 1055: <ul>
1.72 deraadt 1056: <li><a href=errata22.html#ipsec>May 5, 1998: Incorrect handling of IPSEC
1057: packets if IPSEC is enabled (patch included).</a>
1058: <li><a href=errata22.html#xterm-xaw>May 1, 1998: Buffer overflow in xterm
1059: and Xaw (CERT advisory VB-98.04) (patch included).</a>
1060: <li><a href=errata22.html#uucpd>Apr 22, 1998: Buffer overflow in uucpd
1061: (patch included).</a>
1062: <li><a href=errata22.html#rmjob>Apr 22, 1998: Buffer mismanagement in lprm
1063: (patch included).</a>
1064: <li><a href=errata22.html#ping>Mar 31, 1998: Overflow in ping -R (patch included).</a>
1065: <li><a href=errata22.html#named>Mar 30, 1998: Overflow in named fake-iquery
1.59 deraadt 1066: (patch included).</a>
1.72 deraadt 1067: <li><a href=errata22.html#mountd>Mar 2, 1998: Accidental NFS filesystem
1068: export (patch included).</a>
1.112 philen 1069: <li><a href="advisories/mmap.txt">Feb 26, 1998: Read-write mmap() flaw.</a>
1.72 deraadt 1070: Revision 3 of the patch is available <a href=errata22.html#mmap>here</a>
1.112 philen 1071: <li><a href="advisories/sourceroute.txt">Feb 19, 1998: Sourcerouted Packet
1.59 deraadt 1072: Acceptance.</a>
1.50 deraadt 1073: A patch is available <a href=errata22.html#sourceroute>here</a>.
1.122 rohee 1074: <li><a href=errata22.html#ruserok>Feb 13, 1998: Setuid coredump & Ruserok()
1.72 deraadt 1075: flaw (patch included).</a>
1076: <li><a href=errata22.html#ldso>Feb 9, 1998: MIPS ld.so flaw (patch included).</a>
1.1 deraadt 1077: </ul>
1078:
1.106 deraadt 1079: <p>
1080: <li>
1.58 deraadt 1081: <a name=21></a>
1.235 miod 1082:
1.110 deraadt 1083: <h3><font color=#e00000>OpenBSD 2.1 Security Advisories</font></h3>
1.52 deraadt 1084: These are the OpenBSD 2.1 advisories. All these problems are solved
1085: in <a href=22.html>OpenBSD 2.2</a>. Some of these problems still
1086: exist in other operating systems. (If you are running OpenBSD 2.1, we
1087: would strongly recommend an upgrade to the newest release, as this
1088: patch list only attempts at fixing the most important security
1089: problems. In particular, OpenBSD 2.2 fixes numerous localhost
1090: security problems. Many of those problems were solved in ways which
1091: make it hard for us to provide patches).
1092:
1.96 deraadt 1093: <p>
1.52 deraadt 1094: <ul>
1.112 philen 1095: <li><a href="advisories/signals.txt">Sep 15, 1997: Deviant Signals (patch included)</a>
1096: <li><a href="advisories/rfork.txt">Aug 2, 1997: Rfork() system call flaw
1.59 deraadt 1097: (patch included)</a>
1.112 philen 1098: <li><a href="advisories/procfs.txt">Jun 24, 1997: Procfs flaws (patch included)</a>
1.52 deraadt 1099: </ul>
1.51 deraadt 1100:
1.106 deraadt 1101: <p>
1102: <li>
1103: <a name=20></a>
1.235 miod 1104:
1.110 deraadt 1105: <h3><font color=#e00000>OpenBSD 2.0 Security Advisories</font></h3>
1.99 deraadt 1106: These are the OpenBSD 2.0 advisories. All these problems are solved
1107: in <a href=21.html>OpenBSD 2.1</a>. Some of these problems still
1108: exist in other operating systems. (If you are running OpenBSD 2.0, we
1109: commend you for being there back in the old days!, but you're really
1110: missing out if you don't install a new version!)
1111:
1112: <p>
1113: <ul>
1.112 philen 1114: <li><a href="advisories/res_random.txt">April 22, 1997: Predictable IDs in the
1.99 deraadt 1115: resolver (patch included)</a>
1116: <li>Many others... if people can hunt them down, please let me know
1117: and we'll put them up here.
1118: </ul>
1119:
1.106 deraadt 1120: </dl>
1.51 deraadt 1121: <p>
1.106 deraadt 1122:
1123: <a name=watching></a>
1.110 deraadt 1124: <li><h3><font color=#e00000>Watching our Changes</font></h3><p>
1.106 deraadt 1125:
1.21 deraadt 1126: Since we take a proactive stance with security, we are continually
1127: finding and fixing new security problems. Not all of these problems
1.80 espie 1128: get widely reported because (as stated earlier) many of them are not
1.45 deraadt 1129: confirmed to be exploitable; many simple bugs we fix do turn out to
1130: have security consequences we could not predict. We do not have the
1131: time resources to make these changes available in the above format.<p>
1.21 deraadt 1132:
1133: Thus there are usually minor security fixes in the current source code
1134: beyond the previous major OpenBSD release. We make a limited
1.45 deraadt 1135: guarantee that these problems are of minimal impact and unproven
1.44 ian 1136: exploitability. If we discover that a problem definitely matters for
1.45 deraadt 1137: security, patches will show up here <strong>VERY</strong> quickly.<p>
1.21 deraadt 1138:
1.45 deraadt 1139: People who are really concerned with security can do a number of
1140: things:<p>
1.21 deraadt 1141:
1142: <ul>
1143: <li>If you understand security issues, watch our
1.27 deraadt 1144: <a href=mail.html>source-changes mailing list</a> and keep an
1.23 deraadt 1145: eye out for things which appear security related. Since
1.21 deraadt 1146: exploitability is not proven for many of the fixes we make,
1147: do not expect the relevant commit message to say "SECURITY FIX!".
1148: If a problem is proven and serious, a patch will be available
1149: here very shortly after.
1.161 horacio 1150: <li>In addition to source changes, you can watch our <a href="mail.html">
1.160 ericj 1151: security-announce mailing list</a> which will notify you for every
1.186 ian 1152: security related item that the OpenBSD team deems as a possible threat,
1.160 ericj 1153: and instruct you on how to patch the problem.
1.21 deraadt 1154: <li>Track our current source code tree, and teach yourself how to do a
1.29 deraadt 1155: complete system build from time to time (read /usr/src/Makefile
1156: carefully). Users can make the assumption that the current
1157: source tree always has stronger security than the previous release.
1.45 deraadt 1158: However, building your own system from source code is not trivial;
1.265 miod 1159: it is nearly 600MB of source code, and problems do occur as we
1.45 deraadt 1160: transition between major releases.
1.115 ericj 1161: <li>Install a binary snapshot for your
1.80 espie 1162: architecture, which are made available fairly often. For
1.29 deraadt 1163: instance, an i386 snapshot is typically made available weekly.
1.21 deraadt 1164: </ul>
1165:
1.9 deraadt 1166: <p>
1.153 jufi 1167: <a name=reporting></a>
1.110 deraadt 1168: <li><h3><font color=#e00000>Reporting problems</font></h3><p>
1.3 deraadt 1169:
1.5 deraadt 1170: <p> If you find a new security problem, you can mail it to
1.6 deraadt 1171: <a href=mailto:deraadt@openbsd.org>deraadt@openbsd.org</a>.
1.7 deraadt 1172: <br>
1.5 deraadt 1173: If you wish to PGP encode it (but please only do so if privacy is very
1.112 philen 1174: urgent, since it is inconvenient) use this <a href="advisories/pgpkey.txt">pgp key</a>.
1.5 deraadt 1175:
1.107 deraadt 1176: <p>
1177: <a name=papers></a>
1.110 deraadt 1178: <li><h3><font color=#e00000>Further Reading</font></h3><p>
1.107 deraadt 1179:
1180: A number of papers have been written by OpenBSD team members, about security
1181: related changes they have done in OpenBSD. The postscript versions of these
1.108 deraadt 1182: documents are available as follows.<p>
1.107 deraadt 1183:
1184: <ul>
1.113 deraadt 1185: <li>A Future-Adaptable Password Scheme.<br>
1.118 deraadt 1186: <a href=events.html#usenix99>Usenix 1999</a>,
1.153 jufi 1187: by <a href=mailto:provos@openbsd.org>Niels Provos</a>,
1.113 deraadt 1188: <a href=mailto:dm@openbsd.org>David Mazieres</a>.<br>
1.107 deraadt 1189: <a href=papers/bcrypt-paper.ps>paper</a> and
1190: <a href=papers/bcrypt-slides.ps>slides</a>.
1.113 deraadt 1191: <p>
1192: <li>Cryptography in OpenBSD: An Overview.<br>
1.118 deraadt 1193: <a href=events.html#usenix99>Usenix 1999</a>,
1.113 deraadt 1194: by <a href=mailto:deraadt@openbsd.org>Theo de Raadt</a>,
1195: <a href=mailto:niklas@openbsd.org>Niklas Hallqvist</a>,
1196: <a href=mailto:art@openbsd.org>Artur Grabowski</a>,
1197: <a href=mailto:angelos@openbsd.org>Angelos D. Keromytis</a>,
1198: <a href=mailto:provos@openbsd.org>Niels Provos</a>.<br>
1.107 deraadt 1199: <a href=papers/crypt-paper.ps>paper</a> and
1200: <a href=papers/crypt-slides.ps>slides</a>.
1.113 deraadt 1201: <p>
1202: <li>strlcpy and strlcat -- consistent, safe, string copy and concatenation.<br>
1.118 deraadt 1203: <a href=events.html#usenix99>Usenix 1999</a>,
1.113 deraadt 1204: by <a href=mailto:millert@openbsd.org>Todd C. Miller</a>,
1205: <a href=mailto:deraadt@openbsd.org>Theo de Raadt</a>.<br>
1.109 deraadt 1206: <a href=papers/strlcpy-paper.ps>paper</a> and
1207: <a href=papers/strlcpy-slides.ps>slides</a>.
1.113 deraadt 1208: <p>
1.118 deraadt 1209: <li>Dealing with Public Ethernet Jacks-Switches, Gateways, and Authentication.<br>
1210: <a href=events.html#lisa99>LISA 1999</a>,
1211: by <a href=mailto:beck@openbsd.org>Bob Beck</a>.<br>
1212: <a href=papers/authgw-paper.ps>paper</a> and
1213: <a href=papers/authgw-slides.ps>slides</a>.
1214: <p>
1.153 jufi 1215: <li>Encrypting Virtual Memory<br>
1.142 deraadt 1216: <a href=events.html#sec2000>Usenix Security 2000</a>,
1217: <a href=mailto:provos@openbsd.org>Niels Provos</a>.<br>
1.143 provos 1218: <a href=papers/swapencrypt.ps>paper</a> and
1219: <a href=papers/swapencrypt-slides.ps>slides</a>.
1.142 deraadt 1220: <p>
1.107 deraadt 1221: </ul>
1222:
1.106 deraadt 1223: </dl>
1224:
1.2 deraadt 1225: <hr>
1.68 pauls 1226: <a href=index.html><img height=24 width=24 src=back.gif border=0 alt=OpenBSD></a>
1.24 deraadt 1227: <a href=mailto:www@openbsd.org>www@openbsd.org</a>
1228: <br>
1.284 ! otto 1229: <small>$OpenBSD: security.html,v 1.283 2004/05/13 13:50:09 brad Exp $</small>
1.1 deraadt 1230:
1.24 deraadt 1231: </body>
1232: </html>
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