Annotation of www/security.html, Revision 1.270
1.1 deraadt 1: <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML Strict//EN">
2: <html>
3: <head>
1.20 deraadt 4: <title>OpenBSD Security</title>
1.1 deraadt 5: <link rev=made href=mailto:www@openbsd.org>
6: <meta name="resource-type" content="document">
7: <meta name="description" content="OpenBSD advisories">
8: <meta name="keywords" content="openbsd,main">
9: <meta name="distribution" content="global">
1.193 horacio 10: <meta name="copyright" content="This document copyright 1997-2002 by OpenBSD.">
1.1 deraadt 11: </head>
12:
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>,
53: <a href="#34">3.4</a>.
1.114 philen 54: </td>
55: </tr>
56: </table>
1.56 deraadt 57: <hr>
58:
1.106 deraadt 59: <dl>
60: <a name=goals></a>
1.110 deraadt 61: <li><h3><font color=#e00000>Goal</font></h3><p>
1.22 deraadt 62:
1.14 deraadt 63: OpenBSD believes in strong security. Our aspiration is to be NUMBER
1.22 deraadt 64: ONE in the industry for security (if we are not already there). Our
65: open software development model permits us to take a more
66: uncompromising view towards increased security than Sun, SGI, IBM, HP,
67: or other vendors are able to. We can make changes the vendors would
1.27 deraadt 68: not make. Also, since OpenBSD is exported with <a href=crypto.html>
1.45 deraadt 69: cryptography</a>, we are able to take cryptographic approaches towards
70: fixing security problems.<p>
1.18 deraadt 71:
1.106 deraadt 72: <a name=disclosure></a>
1.110 deraadt 73: <li><h3><font color=#e00000>Full Disclosure</font></h3><p>
1.106 deraadt 74:
1.45 deraadt 75: Like many readers of the
1.196 jufi 76: <a href="http://online.securityfocus.com/archive/1">
1.18 deraadt 77: BUGTRAQ mailing list</a>,
1.106 deraadt 78: we believe in full disclosure of security problems. In the
79: operating system arena, we were probably the first to embrace
80: the concept. Many vendors, even of free software, still try
81: to hide issues from their users.<p>
82:
83: Security information moves very fast in cracker circles. On the other
84: hand, our experience is that coding and releasing of proper security
85: fixes typically requires about an hour of work -- very fast fix
86: turnaround is possible. Thus we think that full disclosure helps the
87: people who really care about security.<p>
88:
1.153 jufi 89: <a name=process></a>
1.110 deraadt 90: <li><h3><font color=#e00000>Audit Process</font></h3><p>
1.15 deraadt 91:
1.12 deraadt 92: Our security auditing team typically has between six and twelve
1.45 deraadt 93: members who continue to search for and fix new security holes. We
94: have been auditing since the summer of 1996. The process we follow to
95: increase security is simply a comprehensive file-by-file analysis of
1.106 deraadt 96: every critical software component. We are not so much looking for
97: security holes, as we are looking for basic software bugs, and if
1.138 deraadt 98: years later someone discovers the problem used to be a security
1.106 deraadt 99: issue, and we fixed it because it was just a bug, well, all the
100: better. Flaws have been found in just about every area of the system.
101: Entire new classes of security problems have been found during our
102: audit, and often source code which had been audited earlier needs
103: re-auditing with these new flaws in mind. Code often gets audited
104: multiple times, and by multiple people with different auditing
105: skills.<p>
1.12 deraadt 106:
1.94 deraadt 107: Some members of our security auditing team worked for Secure Networks,
108: the company that made the industry's premier network security scanning
109: software package Ballista (Secure Networks got purchased by Network
110: Associates, Ballista got renamed to Cybercop Scanner, and well...)
111: That company did a lot of security research, and thus fit in well
1.106 deraadt 112: with the OpenBSD stance. OpenBSD passed Ballista's tests with flying
113: colours since day 1.<p>
1.31 deraadt 114:
1.34 deraadt 115: Another facet of our security auditing process is its proactiveness.
1.45 deraadt 116: In most cases we have found that the determination of exploitability
117: is not an issue. During our ongoing auditing process we find many
118: bugs, and endeavor to fix them even though exploitability is not
119: proven. We fix the bug, and we move on to find other bugs to fix. We
120: have fixed many simple and obvious careless programming errors in code
121: and only months later discovered that the problems were in fact
122: exploitable. (Or, more likely someone on
1.197 jufi 123: <a href="http://online.securityfocus.com/archive/1">BUGTRAQ</a>
1.45 deraadt 124: would report that other operating systems were vulnerable to a `newly
125: discovered problem', and then it would be discovered that OpenBSD had
126: been fixed in a previous release). In other cases we have been saved
127: from full exploitability of complex step-by-step attacks because we
128: had fixed one of the intermediate steps. An example of where we
1.94 deraadt 129: managed such a success is the lpd advisory that Secure Networks put out.
130: <p>
1.29 deraadt 131:
1.110 deraadt 132: <li><h3><font color=#e00000>The Reward</font></h3><p>
1.106 deraadt 133:
1.45 deraadt 134: Our proactive auditing process has really paid off. Statements like
1.35 deraadt 135: ``This problem was fixed in OpenBSD about 6 months ago'' have become
1.45 deraadt 136: commonplace in security forums like
1.197 jufi 137: <a href="http://online.securityfocus.com/archive/1">BUGTRAQ</a>.<p>
1.35 deraadt 138:
1.45 deraadt 139: The most intense part of our security auditing happened immediately
1.80 espie 140: before the OpenBSD 2.0 release and during the 2.0->2.1 transition,
1.45 deraadt 141: over the last third of 1996 and first half of 1997. Thousands (yes,
142: thousands) of security issues were fixed rapidly over this year-long
143: period; bugs like the standard buffer overflows, protocol
144: implementation weaknesses, information gathering, and filesystem
145: races. Hence most of the security problems that we encountered were
146: fixed before our 2.1 release, and then a far smaller number needed
147: fixing for our 2.2 release. We do not find as many problems anymore,
148: it is simply a case of diminishing returns. Recently the security
149: problems we find and fix tend to be significantly more obscure or
150: complicated. Still we will persist for a number of reasons:<p>
1.36 deraadt 151:
1.35 deraadt 152: <ul>
1.45 deraadt 153: <li>Occasionally we find a simple problem we missed earlier. Doh!
1.35 deraadt 154: <li>Security is like an arms race; the best attackers will continue
1.45 deraadt 155: to search for more complicated exploits, so we will too.
156: <li>Finding and fixing subtle flaws in complicated software is
157: a lot of fun.
1.35 deraadt 158: </ul>
1.106 deraadt 159: <p>
1.15 deraadt 160:
1.14 deraadt 161: The auditing process is not over yet, and as you can see we continue
1.28 deraadt 162: to find and fix new security flaws.<p>
1.12 deraadt 163:
1.106 deraadt 164: <a name=default></a>
1.110 deraadt 165: <li><h3><font color=#e00000>"Secure by Default"</font></h3><p>
1.106 deraadt 166:
167: To ensure that novice users of OpenBSD do not need to become security
168: experts overnight (a viewpoint which other vendors seem to have), we
169: ship the operating system in a Secure by Default mode. All non-essential
170: services are disabled. As the user/administrator becomes more familiar
171: with the system, he will discover that he has to enable daemons and other
172: parts of the system. During the process of learning how to enable a new
173: service, the novice is more likely to learn of security considerations.<p>
174:
175: This is in stark contrast to the increasing number of systems that
176: ship with NFS, mountd, web servers, and various other services enabled
177: by default, creating instantaneous security problems for their users
178: within minutes after their first install.<p>
179:
1.153 jufi 180: <a name=crypto></a>
1.110 deraadt 181: <li><h3><font color=#e00000>Cryptography</font></h3><p>
1.106 deraadt 182:
183: And of course, since the OpenBSD project is based in Canada, it is possible
184: for us to integrate cryptography. For more information, read the page
1.116 deraadt 185: outlining <a href=crypto.html>what we have done with cryptography</a>.</p>
1.106 deraadt 186:
1.110 deraadt 187: <li><h3><font color=#e00000>Advisories</font></h3><p>
1.106 deraadt 188:
189: <dl>
190:
191: <li>
1.261 david 192: <a name=34></a>
193:
194: <h3><font color=#e00000>OpenBSD 3.4 Security Advisories</font></h3>
195: These are the OpenBSD 3.4 advisories -- all these problems are solved
196: in <a href=anoncvs.html>OpenBSD current</a> and the
197: <a href=stable.html>patch branch</a>.
198:
199: <p>
200: <ul>
1.269 jose 201: <li><a href=errata.html#isakmpd>January 13, 2004:
1.266 brad 202: Several message handling flaws in isakmpd(8) have been reported
203: by Thomas Walpuski.
1.264 henning 204: <li><a href=errata.html#ibcs2>November 17, 2003:
205: It may be possible for a local user to overrun the stack in
206: compat_ibcs2(8) and cause a kernel panic.</a>
1.263 margarid 207: <li><a href=errata.html#asn1>November 1, 2003:
1.262 margarid 208: The use of certain ASN.1 encodings or malformed public keys may
209: allow an attacker to mount a denial of service attack against
210: applications linked with ssl(3).</a>
1.261 david 211: </ul>
212:
213: <p>
214: <li>
1.246 deraadt 215: <a name=33></a>
216:
217: <h3><font color=#e00000>OpenBSD 3.3 Security Advisories</font></h3>
218: These are the OpenBSD 3.3 advisories -- all these problems are solved
219: in <a href=anoncvs.html>OpenBSD current</a> and the
220: <a href=stable.html>patch branch</a>.
221:
222: <p>
223: <ul>
1.270 ! jose 224: <li><a href=errata33.html#isakmpd>January 15, 2004:
1.268 brad 225: Several message handling flaws in isakmpd(8) have been reported
226: by Thomas Walpuski.
1.264 henning 227: <li><a href=errata33.html#ibcs2>November 17, 2003:
228: It may be possible for a local user to execute arbitrary code
229: resulting in escalation of privileges due to a stack overrun
230: in compat_ibcs2(8).</a>
1.261 david 231: <li><a href=errata33.html#asn1>October 1, 2003:
1.257 millert 232: The use of certain ASN.1 encodings or malformed public keys may
233: allow an attacker to mount a denial of service attack against
234: applications linked with ssl(3).</a>
1.261 david 235: <li><a href=errata33.html#pfnorm>September 24, 2003:
1.258 beck 236: Access of freed memory in pf(4) could be used to
1.260 margarid 237: remotely panic a machine using scrub rules.</a>
1.261 david 238: <li><a href=errata33.html#sendmail>September 17, 2003:
1.256 millert 239: A buffer overflow in the address parsing in
240: sendmail(8) may allow an attacker to gain root privileges.</a>
1.261 david 241: <li><a href=errata33.html#sshbuffer>September 16, 2003:
1.255 millert 242: OpenSSH versions prior to 3.7 contains a buffer management error
243: that is potentially exploitable.</a>
1.261 david 244: <li><a href=errata33.html#sysvsem>September 10, 2003:
1.254 millert 245: Root may be able to reduce the security level by taking advantage of
246: an integer overflow when the semaphore limits are made very large.</a>
1.261 david 247: <li><a href=errata33.html#semget>August 20, 2003:
1.252 millert 248: An improper bounds check in the kernel may allow a local user
249: to panic the kernel.</a>
1.261 david 250: <li><a href=errata33.html#realpath>August 4, 2003:
1.249 millert 251: An off-by-one error exists in the C library function realpath(3)
252: may allow an attacker to gain escalated privileges.</a>
1.246 deraadt 253: </ul>
254:
1.265 miod 255: </dl>
256: <p>
257: OpenBSD 3.2 and earlier releases are not supported anymore. The following
258: paragraphs only list advisories issued while they were maintained; these
259: releases are likely to be affected by the advisories for more recent releases.
260: <br>
261: <dl>
262:
1.247 david 263: <p>
1.246 deraadt 264: <li>
1.224 deraadt 265: <a name=32></a>
266:
267: <h3><font color=#e00000>OpenBSD 3.2 Security Advisories</font></h3>
268: These are the OpenBSD 3.2 advisories -- all these problems are solved
1.265 miod 269: in <a href=anoncvs.html>OpenBSD current</a>. The
270: <a href=stable.html>patch branch</a> for 3.2 is no longer being maintained,
271: you should update your machine.
1.224 deraadt 272: <p>
273: <ul>
1.257 millert 274: <li><a href=errata32.html#asn1>October 1, 2003:
275: The use of certain ASN.1 encodings or malformed public keys may
276: allow an attacker to mount a denial of service attack against
277: applications linked with ssl(3). This does not affect OpenSSH.</a>
1.259 margarid 278: <li><a href=errata32.html#pfnorm>September 24, 2003:
1.258 beck 279: Access of freed memory in pf(4) could be used to
1.260 margarid 280: remotely panic a machine using scrub rules.</a>
1.256 millert 281: <li><a href=errata32.html#sendmail4>September 17, 2003:
282: A buffer overflow in the address parsing in
283: sendmail(8) may allow an attacker to gain root privileges.</a>
1.255 millert 284: <li><a href=errata32.html#sshbuffer>September 16, 2003:
285: OpenSSH versions prior to 3.7 contains a buffer management error
286: that is potentially exploitable.</a>
1.253 brad 287: <li><a href=errata32.html#sendmail3>August 25, 2003:
288: Fix for a potential security issue in
289: sendmail(8) with respect to DNS maps.</a>
1.249 millert 290: <li><a href=errata32.html#realpath>August 4, 2003:
291: An off-by-one error exists in the C library function realpath(3)
292: may allow an attacker to gain escalated privileges.</a>
1.244 miod 293: <li><a href=errata32.html#sendmail2>March 31, 2003:
294: A buffer overflow in the address parsing in
295: sendmail(8) may allow an attacker to gain root privileges.</a>
1.243 deraadt 296: <li><a href=errata32.html#kerberos>March 24, 2003:
1.242 millert 297: A cryptographic weaknesses in the Kerberos v4 protocol can be
298: exploited on Kerberos v5 as well.</a>
1.243 deraadt 299: <li><a href=errata32.html#kpr>March 19, 2003:
1.241 jufi 300: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 301: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.243 deraadt 302: <li><a href=errata32.html#blinding>March 18, 2003:
1.239 miod 303: Various SSL and TLS operations in OpenSSL are vulnerable to
304: timing attacks.</a>
1.243 deraadt 305: <li><a href=errata32.html#lprm>March 5, 2003:
1.238 millert 306: A buffer overflow in lprm(1) may allow an attacker to elevate
307: privileges to user daemon.</a>.
1.243 deraadt 308: <li><a href=errata32.html#sendmail>March 3, 2003:
1.237 miod 309: A buffer overflow in the envelope comments processing in
310: sendmail(8) may allow an attacker to gain root privileges.</a>
1.243 deraadt 311: <li><a href=errata32.html#httpd>February 25, 2003:
1.236 margarid 312: httpd(8) leaks file inode numbers via ETag header as well as
313: child PIDs in multipart MIME boundary generation. This could
314: lead, for example, to NFS exploitation because it uses inode
315: numbers as part of the file handle.</a>
1.243 deraadt 316: <li><a href=errata32.html#ssl>February 22, 2003:
1.234 margarid 317: In ssl(8) an information leak can occur via timing by performing
318: a MAC computation even if incorrect block cipher padding has
319: been found, this is a countermeasure. Also, check for negative
320: sizes, in allocation routines.</a>
1.243 deraadt 321: <li><a href=errata32.html#cvs>January 20, 2003:
1.232 millert 322: A double free exists in cvs(1) that could lead to privilege
323: escalation for cvs configurations where the cvs command is
1.233 margarid 324: run as a privileged user.</a>
1.243 deraadt 325: <li><a href=errata32.html#named>November 14, 2002:
1.230 millert 326: A buffer overflow exists in named(8) that could lead to a
327: remote crash or code execution as user named in a chroot jail.</a>
1.243 deraadt 328: <li><a href=errata32.html#pool>November 6, 2002:
1.233 margarid 329: A logic error in the pool kernel memory allocator could cause
330: memory corruption in low-memory situations, causing the system
331: to crash.</a>
1.243 deraadt 332: <li><a href=errata32.html#smrsh>November 6, 2002:
1.229 miod 333: An attacker can bypass smrsh(8)'s restrictions and execute
334: arbitrary commands with the privileges of his own account.</a>
1.243 deraadt 335: <li><a href=errata32.html#pfbridge>November 6, 2002:
1.233 margarid 336: Network bridges running pf with scrubbing enabled could cause
337: mbuf corruption, causing the system to crash.</a>
1.243 deraadt 338: <li><a href=errata32.html#kadmin>October 21, 2002:
1.228 miod 339: A buffer overflow can occur in the kadmind(8) daemon, leading
340: to possible remote crash or exploit.</a>
1.224 deraadt 341: </ul>
342:
1.227 miod 343: <p>
344: <li>
1.203 deraadt 345: <a name=31></a>
346:
347: <h3><font color=#e00000>OpenBSD 3.1 Security Advisories</font></h3>
348: These are the OpenBSD 3.1 advisories -- all these problems are solved
1.258 beck 349: in <a href=anoncvs.html>OpenBSD current</a>. The
350: <a href=stable.html>patch branch</a> for 3.1 is no longer being maintained,
351: you should update your machine.
1.203 deraadt 352:
353: <p>
354: <ul>
1.244 miod 355: <li><a href=errata31.html#sendmail2>March 31, 2003:
356: A buffer overflow in the address parsing in
357: sendmail(8) may allow an attacker to gain root privileges.</a>
1.242 millert 358: <li><a href=errata31.html#kerberos>March 24, 2003:
359: A cryptographic weaknesses in the Kerberos v4 protocol can be
360: exploited on Kerberos v5 as well.</a>
1.240 miod 361: <li><a href=errata31.html#kpr>March 19, 2003:
1.241 jufi 362: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 363: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.239 miod 364: <li><a href=errata31.html#blinding>March 18, 2003:
365: Various SSL and TLS operations in OpenSSL are vulnerable to
366: timing attacks.</a>
1.238 millert 367: <li><a href=errata31.html#lprm>March 4, 2003:
368: A buffer overflow in lprm(1) may allow an attacker to gain
369: root privileges.</a>
1.237 miod 370: <li><a href=errata31.html#sendmail>March 3, 2003:
371: A buffer overflow in the envelope comments processing in
372: sendmail(8) may allow an attacker to gain root privileges.</a>
1.235 miod 373: <li><a href=errata31.html#ssl2>February 23, 2003:
374: In ssl(8) an information leak can occur via timing by performing
375: a MAC computation even if incorrect block cipher padding has
376: been found, this is a countermeasure. Also, check for negative
377: sizes, in allocation routines.</a>
1.232 millert 378: <li><a href=errata31.html#cvs>January 20, 2003:
379: A double free exists in cvs(1) that could lead to privilege
380: escalation for cvs configurations where the cvs command is
381: run as a privileged user.
1.230 millert 382: <li><a href=errata31.html#named>November 14, 2002:
383: A buffer overflow exists in named(8) that could lead to a
384: remote crash or code execution as user named in a chroot jail.</a>
1.229 miod 385: <li><a href=errata31.html#kernresource>November 6, 2002:
386: Incorrect argument checking in the getitimer(2) system call
387: may allow an attacker to crash the system.</a>
388: <li><a href=errata31.html#smrsh>November 6, 2002:
389: An attacker can bypass smrsh(8)'s restrictions and execute
390: arbitrary commands with the privileges of his own account.</a>
1.226 miod 391: <li><a href=errata31.html#kadmin>October 21, 2002:
392: A buffer overflow can occur in the kadmind(8) daemon, leading
393: to possible remote crash or exploit.</a>
1.224 deraadt 394: <li><a href=errata31.html#kerntime>October 2, 2002:
1.222 jason 395: Incorrect argument checking in the setitimer(2) system call
396: may allow an attacker to write to kernel memory.</a>
1.224 deraadt 397: <li><a href=errata31.html#scarg>August 11, 2002:
1.221 provos 398: An insufficient boundary check in the select system call
1.220 miod 399: allows an attacker to overwrite kernel memory and execute arbitrary code
400: in kernel context.</a>
1.224 deraadt 401: <li><a href=errata31.html#ssl>July 30, 2002:
1.218 miod 402: Several remote buffer overflows can occur in the SSL2 server and SSL3
403: client of the ssl(8) library, as in the ASN.1 parser code in the
404: crypto(3) library, all of them being potentially remotely
405: exploitable.</a>
1.224 deraadt 406: <li><a href=errata31.html#xdr>July 29, 2002:
1.218 miod 407: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
408: possible remote crash.</a>
1.224 deraadt 409: <li><a href=errata31.html#pppd>July 29, 2002:
1.218 miod 410: A race condition exists in the pppd(8) daemon which may cause it to
411: alter the file permissions of an arbitrary file.</a>
1.224 deraadt 412: <li><a href=errata31.html#isakmpd>July 5, 2002:
1.218 miod 413: Receiving IKE payloads out of sequence can cause isakmpd(8) to
414: crash.</a>
1.224 deraadt 415: <li><a href=errata31.html#ktrace>June 27, 2002:
1.215 miod 416: The kernel would let any user ktrace set[ug]id processes.</a>
1.224 deraadt 417: <li><a href=errata31.html#modssl>June 26, 2002:
1.213 miod 418: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 419: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.224 deraadt 420: <li><a href=errata31.html#resolver>June 25, 2002:
1.212 millert 421: A potential buffer overflow in the DNS resolver has been found.</a>
1.224 deraadt 422: <li><a href=errata31.html#sshd>June 24, 2002:
1.216 deraadt 423: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 424: input validation error that can result in an integer overflow and
425: privilege escalation.</a>
1.224 deraadt 426: <li><a href=errata31.html#httpd>June 19, 2002:
1.211 miod 427: A buffer overflow can occur during the interpretation of chunked
428: encoding in httpd(8), leading to possible remote crash.</a>
1.224 deraadt 429: <li><a href=errata31.html#sshbsdauth>May 22, 2002:
1.209 markus 430: Under certain conditions, on systems using YP with netgroups
431: in the password database, it is possible that sshd(8) does
432: ACL checks for the requested user name but uses the password
433: database entry of a different user for authentication. This
434: means that denied users might authenticate successfully
435: while permitted users could be locked out.</a>
1.224 deraadt 436: <li><a href=errata31.html#fdalloc2>May 8, 2002:
1.208 millert 437: A race condition exists that could defeat the kernel's
438: protection of fd slots 0-2 for setuid processes.</a>
1.224 deraadt 439: <li><a href=errata31.html#sudo>April 25, 2002:
1.205 millert 440: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.224 deraadt 441: <li><a href=errata31.html#sshafs>April 22, 2002:
1.205 millert 442: A local user can gain super-user privileges due to a buffer
443: overflow in sshd(8) if AFS has been configured on the system
444: or if KerberosTgtPassing or AFSTokenPassing has been enabled
445: in the sshd_config file.</a>
1.203 deraadt 446: </ul>
447:
1.235 miod 448: <p>
1.203 deraadt 449: <li>
1.187 deraadt 450: <a name=30></a>
451:
452: <h3><font color=#e00000>OpenBSD 3.0 Security Advisories</font></h3>
453: These are the OpenBSD 3.0 advisories -- all these problems are solved
1.258 beck 454: in <a href=anoncvs.html>OpenBSD current</a>. The
455: <a href=stable.html>patch branch</a> for 3.0 is no longer being maintained,
456: you should update your machine.
1.187 deraadt 457:
458: <p>
459: <ul>
1.230 millert 460: <li><a href=errata30.html#named>November 14, 2002:
461: A buffer overflow exists in named(8) that could lead to a
462: remote crash or code execution as user named in a chroot jail.</a>
1.229 miod 463: <li><a href=errata30.html#kernresource>November 6, 2002:
464: Incorrect argument checking in the getitimer(2) system call
465: may allow an attacker to crash the system.</a>
466: <li><a href=errata30.html#smrsh>November 6, 2002:
467: An attacker can bypass smrsh(8)'s restrictions and execute
468: arbitrary commands with the privileges of his own account.</a>
1.226 miod 469: <li><a href=errata30.html#kadmin>October 21, 2002:
470: A buffer overflow can occur in the kadmind(8) daemon, leading
471: to possible remote crash or exploit.</a>
1.223 miod 472: <li><a href=errata30.html#kerntime>October 7, 2002:
473: Incorrect argument checking in the setitimer(2) system call
474: may allow an attacker to write to kernel memory.</a>
1.220 miod 475: <li><a href=errata30.html#scarg>August 11, 2002:
476: An insufficient boundary check in the select and poll system calls
477: allows an attacker to overwrite kernel memory and execute arbitrary code
478: in kernel context.</a>
1.218 miod 479: <li><a href=errata30.html#ssl>July 30, 2002:
480: Several remote buffer overflows can occur in the SSL2 server and SSL3
481: client of the ssl(8) library, as in the ASN.1 parser code in the
482: crypto(3) library, all of them being potentially remotely
483: exploitable.</a>
484: <li><a href=errata30.html#xdr>July 29, 2002:
485: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
486: possible remote crash.</a>
487: <li><a href=errata30.html#pppd>July 29, 2002:
488: A race condition exists in the pppd(8) daemon which may cause it to
489: alter the file permissions of an arbitrary file.</a>
1.219 miod 490: <li><a href=errata30.html#isakmpd2>July 5, 2002:
1.218 miod 491: Receiving IKE payloads out of sequence can cause isakmpd(8) to
492: crash.</a>
1.215 miod 493: <li><a href=errata30.html#ktrace>June 27, 2002:
494: The kernel would let any user ktrace set[ug]id processes.</a>
1.212 millert 495: <li><a href=errata30.html#resolver>June 25, 2002:
496: A potential buffer overflow in the DNS resolver has been found.</a>
1.213 miod 497: <li><a href=errata30.html#sshdauth>June 24, 2002:
1.216 deraadt 498: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 499: input validation error that can result in an integer overflow and
500: privilege escalation.</a>
501: <li><a href=errata30.html#modssl>June 24, 2002:
502: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 503: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.213 miod 504: <li><a href=errata30.html#httpd>June 19, 2002:
505: A buffer overflow can occur during the interpretation of chunked
506: encoding in httpd(8), leading to possible remote crash.</a>
1.208 millert 507: <li><a href=errata30.html#fdalloc2>May 8, 2002:
508: A race condition exists that could defeat the kernel's
509: protection of fd slots 0-2 for setuid processes.</a>
1.205 millert 510: <li><a href=errata30.html#sudo2>April 25, 2002:
511: A bug in sudo may allow an attacker to corrupt the heap.</a>
512: <li><a href=errata30.html#sshafs>April 22, 2002:
513: A local user can gain super-user privileges due to a buffer
514: overflow in sshd(8) if AFS has been configured on the system
515: or if KerberosTgtPassing or AFSTokenPassing has been enabled
516: in the sshd_config file.</a>
1.203 deraadt 517: <li><a href=errata30.html#mail>April 11, 2002:
1.202 millert 518: The mail(1) was interpreting tilde escapes even when invoked
519: in non-interactive mode. As mail(1) is called as root from cron,
520: this can lead to a local root compromise.</a>
1.203 deraadt 521: <li><a href=errata30.html#approval>March 19, 2002:
1.201 millert 522: Under certain conditions, on systems using YP with netgroups in
523: the password database, it is possible for the rexecd(8) and rshd(8)
524: daemons to execute a shell from a password database entry for a
525: different user. Similarly, atrun(8) may change to the wrong
526: home directory when running jobs.</a>
1.203 deraadt 527: <li><a href=errata30.html#zlib>March 13, 2002:
1.200 millert 528: A potential double free() exists in the zlib library;
529: this is not exploitable on OpenBSD.
530: The kernel also contains a copy of zlib; it is not
531: currently known if the kernel zlib is exploitable.</a>
1.203 deraadt 532: <li><a href=errata30.html#openssh>March 8, 2002:
1.198 millert 533: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 534: may allow a local user to gain super-user privileges.</a>
1.203 deraadt 535: <li><a href=errata30.html#ptrace>January 21, 2002:
1.192 jason 536: A race condition between the ptrace(2) and execve(2) system calls
537: allows an attacker to modify the memory contents of suid/sgid
538: processes which could lead to compromise of the super-user account.</a>
1.203 deraadt 539: <li><a href=errata30.html#sudo>January 17, 2002:
1.191 millert 540: There is a security hole in sudo(8) that can be exploited
541: when the Postfix sendmail replacement is installed that may
542: allow an attacker on the local host to gain root privileges.</a>
1.203 deraadt 543: <li><a href=errata30.html#lpd>November 28, 2001:
1.189 millert 544: An attacker can trick a machine running the lpd daemon into
545: creating new files in the root directory from a machine with
546: remote line printer access.</a>
1.203 deraadt 547: <li><a href=errata30.html#vi.recover>November 13, 2001:
1.188 millert 548: The vi.recover script can be abused in such a way as
549: to cause arbitrary zero-length files to be removed.</a>
1.203 deraadt 550: <li><a href=errata30.html#pf>November 13, 2001:
1.190 mpech 551: pf(4) was incapable of dealing with certain ipv6 icmp packets,
552: resulting in a crash.</a>
1.203 deraadt 553: <li><a href=errata30.html#sshd>November 12, 2001:
1.190 mpech 554: A security hole that may allow an attacker to partially authenticate
555: if -- and only if -- the administrator has enabled KerberosV.</a>
1.187 deraadt 556: </ul>
557:
558: <p>
559: <li>
1.173 deraadt 560: <a name=29></a>
561:
562: <h3><font color=#e00000>OpenBSD 2.9 Security Advisories</font></h3>
563: These are the OpenBSD 2.9 advisories -- all these problems are solved
1.258 beck 564: in <a href=anoncvs.html>OpenBSD current</a>. The
565: <a href=stable.html>patch branch</a>. for 2.9 is no longer being maintained,
566: you should update your machine.
567:
1.173 deraadt 568:
569: <p>
570: <ul>
1.212 millert 571: <li><a href=errata29.html#resolver>June 25, 2002:
572: A potential buffer overflow in the DNS resolver has been found.</a>
1.208 millert 573: <li><a href=errata29.html#fdalloc2>May 8, 2002:
574: A race condition exists that could defeat the kernel's
575: protection of fd slots 0-2 for setuid processes.</a>
1.207 millert 576: <li><a href=errata29.html#sudo2>April 25, 2002:
577: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.206 millert 578: <li><a href=errata29.html#sshafs>April 22, 2002:
579: A local user can gain super-user privileges due to a buffer
580: overflow in sshd(8) if AFS has been configured on the system
581: or if KerberosTgtPassing or AFSTokenPassing has been enabled
582: in the sshd_config file.</a>
1.202 millert 583: <li><a href=errata29.html#mail>April 11, 2002:
584: The mail(1) was interpreting tilde escapes even when invoked
585: in non-interactive mode. As mail(1) is called as root from cron,
586: this can lead to a local root compromise.</a>
1.200 millert 587: <li><a href=errata29.html#zlib>March 13, 2002:
588: A potential double free() exists in the zlib library;
589: this is not exploitable on OpenBSD.
590: The kernel also contains a copy of zlib; it is not
591: currently known if the kernel zlib is exploitable.</a>
1.198 millert 592: <li><a href=errata29.html#openssh>March 8, 2002:
593: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 594: may allow a local user to gain super-user privileges.</a>
1.198 millert 595: <li><a href=errata29.html#ptrace>January 21, 2002:
596: A race condition between the ptrace(2) and execve(2) system calls
597: allows an attacker to modify the memory contents of suid/sgid
598: processes which could lead to compromise of the super-user account.</a>
1.191 millert 599: <li><a href=errata29.html#sudo>January 17, 2002:
600: There is a security hole in sudo(8) that can be exploited
601: when the Postfix sendmail replacement is installed that may
602: allow an attacker on the local host to gain root privileges.</a>
1.189 millert 603: <li><a href=errata29.html#lpd2>November 28, 2001:
604: An attacker can trick a machine running the lpd daemon into
605: creating new files in the root directory from a machine with
606: remote line printer access.</a>
1.190 mpech 607: <li><a href=errata29.html#vi.recover>November 13, 2001:
608: The vi.recover script can be abused in such a way as
609: to cause arbitrary zero-length files to be removed.</a>
1.185 deraadt 610: <li><a href=errata29.html#uucp>September 11, 2001:
1.184 millert 611: A security hole exists in uuxqt(8) that may allow an
612: attacker to gain root privileges.</a>
1.185 deraadt 613: <li><a href=errata29.html#lpd>August 29, 2001:
1.183 millert 614: A security hole exists in lpd(8) that may allow an
615: attacker to gain root privileges if lpd is running.</a>
1.185 deraadt 616: <li><a href=errata29.html#sendmail2>August 21, 2001:
1.181 millert 617: A security hole exists in sendmail(8) that may allow an
618: attacker on the local host to gain root privileges.</a>
1.185 deraadt 619: <li><a href=errata29.html#nfs>July 30, 2001:
1.180 jason 620: A kernel buffer overflow in the NFS code can be used to execute
621: arbitrary code by users with mount privileges (only root by
1.181 millert 622: default).</a>
1.185 deraadt 623: <li><a href=errata29.html#kernexec>June 15, 2001:
1.178 aaron 624: A race condition in the kernel can lead to local root compromise.</a>
1.185 deraadt 625: <li><a href=errata29.html#sshcookie>June 12, 2001:
1.177 markus 626: sshd(8) allows users to delete arbitrary files named "cookies"
627: if X11 forwarding is enabled. X11 forwarding is disabled
628: by default.</a>
1.185 deraadt 629: <li><a href=errata29.html#fts>May 30, 2001:
1.176 millert 630: Programs using the fts routines can be tricked into changing
631: into the wrong directory.</a>
1.185 deraadt 632: <li><a href=errata29.html#sendmail>May 29, 2001:
1.174 millert 633: Sendmail signal handlers contain unsafe code,
634: leading to numerous race conditions.</a>
1.173 deraadt 635: </ul>
636:
637: <p>
638: <li>
1.152 deraadt 639: <a name=28></a>
640:
641: <h3><font color=#e00000>OpenBSD 2.8 Security Advisories</font></h3>
642: These are the OpenBSD 2.8 advisories -- all these problems are solved
1.258 beck 643: in <a href=anoncvs.html>OpenBSD current</a>. The
644: <a href=stable.html>patch branch</a>. for 2.8 is no longer being maintained,
645: you should update your machine.
646:
1.152 deraadt 647:
648: <p>
649: <ul>
1.184 millert 650: <li><a href=errata28.html#uucp>September 11, 2001:
651: A security hole exists in uuxqt(8) that may allow an
652: attacker to gain root privileges.</a>
1.183 millert 653: <li><a href=errata28.html#lpd>August 29, 2001:
654: A security hole exists in lpd(8) that may allow an
655: attacker to gain root privileges if lpd is running.</a>
1.181 millert 656: <li><a href=errata28.html#sendmail2>August 21, 2001:
657: A security hole exists in sendmail(8) that may allow an
658: attacker on the local host to gain root privileges.</a>
1.178 aaron 659: <li><a href=errata28.html#kernexec>June 15, 2001:
660: A race condition in the kernel can lead to local root compromise.</a>
1.176 millert 661: <li><a href=errata28.html#fts>May 30, 2001:
662: Programs using the fts routines can be tricked into changing
663: into the wrong directory.</a>
1.175 millert 664: <li><a href=errata28.html#sendmail>May 29, 2001:
665: Sendmail signal handlers contain unsafe code,
666: leading to numerous race conditions.</a>
1.173 deraadt 667: <li><a href=errata28.html#ipf_frag>Apr 23, 2001:
1.231 mickey 668: IPF contains a serious bug with its handling of fragment caching.</a>
1.173 deraadt 669: <li><a href=errata28.html#glob_limit>Apr 23, 2001:
1.172 ericj 670: ftpd(8) contains a potential DoS relating to glob(3).</a>
1.173 deraadt 671: <li><a href=errata28.html#glob>Apr 10, 2001:
1.170 ericj 672: The glob(3) library call contains multiple buffer overflows.</a>
1.173 deraadt 673: <li><a href=errata28.html#readline>Mar 18, 2001:
1.169 millert 674: The readline library creates history files with permissive modes based on the user's umask.</a>
1.173 deraadt 675: <li><a href=errata28.html#ipsec_ah>Mar 2, 2001:
1.167 ericj 676: Insufficient checks in the IPSEC AH IPv4 option handling code can lead to a buffer overrun in the kernel.</a>
1.173 deraadt 677: <li><a href=errata28.html#userldt>Mar 2, 2001:
1.168 horacio 678: The <b>USER_LDT</b> kernel option allows an attacker to gain access to privileged areas of kernel memory.</a>
1.173 deraadt 679: <li><a href=errata28.html#sudo>Feb 22, 2001:
1.171 millert 680: a non-exploitable buffer overflow was fixed in sudo(8).</a>
1.173 deraadt 681: <li><a href=errata28.html#named>Jan 29, 2001:
1.163 jason 682: merge named(8) with ISC BIND 4.9.8-REL, which fixes some buffer vulnerabilities.</a>
1.173 deraadt 683: <li><a href=errata28.html#rnd>Jan 22, 2001:
1.162 jason 684: rnd(4) did not use all of its input when written to.</a>
1.173 deraadt 685: <li><a href=errata28.html#xlock>Dec 22, 2000:
1.159 ericj 686: xlock(1)'s authentication was re-done to authenticate via a named pipe. (patch and new xlock binaries included).</a>
1.173 deraadt 687: <li><a href=errata28.html#procfs>Dec 18, 2000:
1.157 ericj 688: Procfs contains numerous overflows. Procfs is not used by default in OpenBSD. (patch included).</a>
1.173 deraadt 689: <li><a href=errata28.html#kerberos2>Dec 10, 2000:
1.156 deraadt 690: Another problem exists in KerberosIV libraries (patch included).</a>
1.173 deraadt 691: <li><a href=errata28.html#kerberos>Dec 7, 2000:
1.155 deraadt 692: A set of problems in KerberosIV exist (patch included).</a>
1.173 deraadt 693: <li><a href=errata28.html#ftpd>Dec 4, 2000:
1.154 millert 694: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.152 deraadt 695: </ul>
696:
697: <p>
698: <li>
1.124 deraadt 699: <a name=27></a>
700:
701: <h3><font color=#e00000>OpenBSD 2.7 Security Advisories</font></h3>
702: These are the OpenBSD 2.7 advisories -- all these problems are solved
703: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
704: OpenBSD 2.6 advisories listed below are fixed in OpenBSD 2.7.
705:
706: <p>
707: <ul>
1.169 millert 708: <li><a href=errata27.html#readline>Mar 18, 2001:
709: The readline library creates history files with permissive modes based on the user's umask.</a>
710: <li><a href=errata27.html#sudo>Feb 22, 2001:
711: a buffer overflow was fixed in sudo(8).</a>
1.154 millert 712: <li><a href=errata27.html#ftpd>Dec 4, 2000:
713: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.152 deraadt 714: <li><a href=errata27.html#sshforwarding>Nov 10, 2000:
715: Hostile servers can force OpenSSH clients to do agent or X11 forwarding.
716: (patch included)</a>
717: <li><a href=errata27.html#xtrans>Oct 26, 2000:
1.151 matthieu 718: X11 libraries have 2 potential overflows in xtrans code.
719: (patch included)</a>
1.152 deraadt 720: <li><a href=errata27.html#httpd>Oct 18, 2000:
1.150 beck 721: Apache mod_rewrite and mod_vhost_alias modules could expose files
722: on the server in certain configurations if used.
723: (patch included)</a>
1.164 deraadt 724: <li><a href=errata27.html#telnetd>Oct 10, 2000:
1.149 millert 725: The telnet daemon does not strip out the TERMINFO, TERMINFO_DIRS,
726: TERMPATH and TERMCAP environment variables as it should.
727: (patch included)</a>
1.152 deraadt 728: <li><a href=errata27.html#format_strings>Oct 6, 2000:
1.148 millert 729: There are printf-style format string bugs in several privileged
730: programs. (patch included)</a>
1.152 deraadt 731: <li><a href=errata27.html#curses>Oct 6, 2000:
1.147 millert 732: libcurses honored terminal descriptions in the $HOME/.terminfo
733: directory as well as in the TERMCAP environment variable for
734: setuid and setgid applications.
1.146 deraadt 735: (patch included)</a>
1.152 deraadt 736: <li><a href=errata27.html#talkd>Oct 6, 2000:
1.146 deraadt 737: A format string vulnerability exists in talkd(8).
738: (patch included)</a>
1.152 deraadt 739: <li><a href=errata27.html#pw_error>Oct 3, 2000:
1.145 aaron 740: A format string vulnerability exists in the pw_error() function of the
741: libutil library, yielding localhost root through chpass(1).
742: (patch included)</a>
1.152 deraadt 743: <li><a href=errata27.html#ipsec>Sep 18, 2000:
1.144 jason 744: Bad ESP/AH packets could cause a crash under certain conditions.
745: (patch included)</a>
1.152 deraadt 746: <li><a href=errata27.html#xlock>Aug 16, 2000:
1.141 deraadt 747: A format string vulnerability (localhost root) exists in xlock(1).
748: (patch included)</a>
1.152 deraadt 749: <li><a href=errata27.html#X11_libs>July 14, 2000:
1.139 deraadt 750: Various bugs found in X11 libraries have various side effects, almost
751: completely denial of service in OpenBSD.
752: (patch included)</a>
1.152 deraadt 753: <li><a href=errata27.html#ftpd>July 5, 2000:
1.136 deraadt 754: Just like pretty much all the other unix ftp daemons
755: on the planet, ftpd had a remote root hole in it.
756: Luckily, ftpd was not enabled by default.
1.137 deraadt 757: The problem exists if anonymous ftp is enabled.
1.136 deraadt 758: (patch included)</a>
1.152 deraadt 759: <li><a href=errata27.html#mopd>July 5, 2000:
1.136 deraadt 760: Mopd, very rarely used, contained some buffer overflows.
761: (patch included)</a>
1.152 deraadt 762: <li><a href=errata27.html#libedit>June 28, 2000:
1.135 deraadt 763: libedit would check for a <b>.editrc</b> file in the current
764: directory. Not known to be a real security issue, but a patch
765: is available anyways.
766: (patch included)</a>
1.152 deraadt 767: <li><a href=errata27.html#dhclient>June 24, 2000:
1.134 deraadt 768: A serious bug in dhclient(8) could allow strings from a
769: malicious dhcp server to be executed in the shell as root.
770: (patch included)</a>
1.152 deraadt 771: <li><a href=errata27.html#isakmpd>June 9, 2000:
1.133 deraadt 772: A serious bug in isakmpd(8) policy handling wherein
773: policy verification could be completely bypassed in isakmpd.
774: (patch included)</a>
1.152 deraadt 775: <li><a href=errata27.html#uselogin>June 6, 2000:
1.132 deraadt 776: The non-default flag UseLogin in <b>/etc/sshd_config</b> is broken,
777: should not be used, and results in security problems on
778: other operating systems.</a>
1.152 deraadt 779: <li><a href=errata27.html#bridge>May 26, 2000:
1.129 deraadt 780: The bridge(4) <i>learning</i> flag may be bypassed.
1.128 deraadt 781: (patch included)</a>
1.152 deraadt 782: <li><a href=errata27.html#ipf>May 25, 2000:
1.127 kjell 783: Improper use of ipf <i>keep-state</i> rules can result
784: in firewall rules being bypassed. (patch included)</a>
785:
1.124 deraadt 786: </ul>
787:
788: <p>
789: <li>
1.119 deraadt 790: <a name=26></a>
791:
792: <h3><font color=#e00000>OpenBSD 2.6 Security Advisories</font></h3>
793: These are the OpenBSD 2.6 advisories -- all these problems are solved
794: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
795: OpenBSD 2.5 advisories listed below are fixed in OpenBSD 2.6.
796:
797: <p>
798: <ul>
1.130 deraadt 799: <li><a href=errata26.html#semconfig>May 26, 2000:
800: SYSV semaphore support contained an undocumented system call
1.131 deraadt 801: which could wedge semaphore-using processes from exiting. (patch included)</a>
1.127 kjell 802: <li><a href=errata26.html#ipf>May 25, 2000:
803: Improper use of ipf <i>keep-state</i> rules can result
804: in firewall rules being bypassed. (patch included)</a>
1.126 deraadt 805: <li><a href=errata26.html#xlockmore>May 25, 2000:
1.125 deraadt 806: xlockmore has a bug which a localhost attacker can use to gain
807: access to the encrypted root password hash (which is normally
1.245 miod 808: encoded using blowfish</a> (see
1.125 deraadt 809: <a href="http://www.openbsd.org/cgi-bin/man.cgi?query=crypt&sektion=3">
810: crypt(3)</a>)
1.245 miod 811: (patch included).
1.126 deraadt 812: <li><a href=errata26.html#procfs>Jan 20, 2000:
1.123 deraadt 813: Systems running with procfs enabled and mounted are
814: vulnerable to a very tricky exploit. procfs is not
815: mounted by default.
816: (patch included).</a>
1.190 mpech 817: <li><a href=errata26.html#sendmail>Dec 4, 1999:
818: Sendmail permitted any user to cause a aliases file wrap,
819: thus exposing the system to a race where the aliases file
820: did not exist.
1.119 deraadt 821: (patch included).</a>
1.190 mpech 822: <li><a href=errata26.html#poll>Dec 4, 1999:
823: Various bugs in poll(2) may cause a kernel crash.</a>
1.126 deraadt 824: <li><a href=errata26.html#sslUSA>Dec 2, 1999:
1.120 deraadt 825: A buffer overflow in the RSAREF code included in the
826: USA version of libssl, is possibly exploitable in
827: httpd, ssh, or isakmpd, if SSL/RSA features are enabled.
1.124 deraadt 828: (patch included).<br></a>
829: <strong>Update:</strong> Turns out that this was not exploitable
830: in any of the software included in OpenBSD 2.6.
1.190 mpech 831: <li><a href=errata26.html#ifmedia>Nov 9, 1999:
832: Any user could change interface media configurations, resulting in
833: a localhost denial of service attack.
1.121 deraadt 834: (patch included).</a>
1.119 deraadt 835: </ul>
836:
837: <p>
838: <li>
1.93 deraadt 839: <a name=25></a>
1.106 deraadt 840:
1.110 deraadt 841: <h3><font color=#e00000>OpenBSD 2.5 Security Advisories</font></h3>
1.93 deraadt 842: These are the OpenBSD 2.5 advisories -- all these problems are solved
843: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
844: OpenBSD 2.4 advisories listed below are fixed in OpenBSD 2.5.
845:
1.96 deraadt 846: <p>
1.104 deraadt 847: <ul>
1.117 deraadt 848: <li><a href=errata25.html#cron>Aug 30, 1999:
1.103 deraadt 849: In cron(8), make sure argv[] is NULL terminated in the
850: fake popen() and run sendmail as the user, not as root.
851: (patch included).</a>
1.117 deraadt 852: <li><a href=errata25.html#miscfs>Aug 12, 1999: The procfs and fdescfs
1.101 deraadt 853: filesystems had an overrun in their handling of uio_offset
854: in their readdir() routines. (These filesystems are not
855: enabled by default). (patch included).</a>
1.117 deraadt 856: <li><a href=errata25.html#profil>Aug 9, 1999: Stop profiling (see profil(2))
1.100 deraadt 857: when we execve() a new process. (patch included).</a>
1.117 deraadt 858: <li><a href=errata25.html#ipsec_in_use>Aug 6, 1999: Packets that should have
1.98 deraadt 859: been handled by IPsec may be transmitted as cleartext.
860: PF_KEY SA expirations may leak kernel resources.
861: (patch included).</a>
1.117 deraadt 862: <li><a href=errata25.html#rc>Aug 5, 1999: In /etc/rc, use mktemp(1) for
1.97 deraadt 863: motd re-writing and change the find(1) to use -execdir
864: (patch included).</a>
1.117 deraadt 865: <li><a href=errata25.html#chflags>Jul 30, 1999: Do not permit regular
1.95 deraadt 866: users to chflags(2) or fchflags(2) on character or block devices
867: which they may currently be the owner of (patch included).</a>
1.117 deraadt 868: <li><a href=errata25.html#nroff>Jul 27, 1999: Cause groff(1) to be invoked
1.95 deraadt 869: with the -S flag, when called by nroff(1) (patch included).</a>
1.93 deraadt 870: </ul>
871:
1.106 deraadt 872: <p>
873: <li>
1.75 deraadt 874: <a name=24></a>
1.235 miod 875:
1.110 deraadt 876: <h3><font color=#e00000>OpenBSD 2.4 Security Advisories</font></h3>
1.75 deraadt 877: These are the OpenBSD 2.4 advisories -- all these problems are solved
878: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
879: OpenBSD 2.3 advisories listed below are fixed in OpenBSD 2.4.
880:
1.96 deraadt 881: <p>
1.75 deraadt 882: <ul>
1.92 deraadt 883: <li><a href=errata24.html#poll>Mar 22, 1999: The nfds argument for poll(2) needs
1.91 deraadt 884: to be constrained, to avoid kvm starvation (patch included).</a>
1.92 deraadt 885: <li><a href=errata24.html#tss>Mar 21, 1999: A change in TSS handling stops
1.91 deraadt 886: another kernel crash case caused by the <strong>crashme</strong>
887: program (patch included).</a>
1.92 deraadt 888: <li><a href=errata24.html#nlink>Feb 25, 1999: An unbounded increment on the
1.90 deraadt 889: nlink value in FFS and EXT2FS filesystems can cause a system crash.
1.89 deraadt 890: (patch included).</a>
1.92 deraadt 891: <li><a href=errata24.html#ping>Feb 23, 1999: Yet another buffer overflow
1.88 deraadt 892: existed in ping(8). (patch included).</a>
1.92 deraadt 893: <li><a href=errata24.html#ipqrace>Feb 19, 1999: ipintr() had a race in use of
1.87 deraadt 894: the ipq, which could permit an attacker to cause a crash.
895: (patch included).</a>
1.92 deraadt 896: <li><a href=errata24.html#accept>Feb 17, 1999: A race condition in the
1.86 deraadt 897: kernel between accept(2) and select(2) could permit an attacker
898: to hang sockets from remote.
899: (patch included).</a>
1.92 deraadt 900: <li><a href=errata24.html#maxqueue>Feb 17, 1999: IP fragment assembly can
1.85 deraadt 901: bog the machine excessively and cause problems.
902: (patch included).</a>
1.92 deraadt 903: <li><a href=errata24.html#trctrap>Feb 12, 1999: i386 T_TRCTRAP handling and
1.84 deraadt 904: DDB interacted to possibly cause a crash.
905: (patch included).</a>
1.92 deraadt 906: <li><a href=errata24.html#rst>Feb 11, 1999: TCP/IP RST handling was sloppy.
1.83 deraadt 907: (patch included).</a>
1.92 deraadt 908: <li><a href=errata24.html#bootpd>Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 909: problem in bootpd(8). (patch included).</a>
1.92 deraadt 910: <li><a href=errata24.html#termcap>Nov 19, 1998: There is a possibly locally
1.82 deraadt 911: exploitable problem relating to environment variables in termcap
912: and curses. (patch included).</a>
1.92 deraadt 913: <li><a href=errata24.html#tcpfix>Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 914: bug in the TCP decoding kernel. (patch included).</a>
1.75 deraadt 915: </ul>
916:
1.106 deraadt 917: <p>
918: <li>
1.58 deraadt 919: <a name=23></a>
1.235 miod 920:
1.110 deraadt 921: <h3><font color=#e00000>OpenBSD 2.3 Security Advisories</font></h3>
1.73 deraadt 922: These are the OpenBSD 2.3 advisories -- all these problems are solved
923: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
924: OpenBSD 2.2 advisories listed below are fixed in OpenBSD 2.3.
1.53 matthieu 925:
1.96 deraadt 926: <p>
1.53 matthieu 927: <ul>
1.81 deraadt 928: <li><a href=errata23.html#bootpd>Nov 27, 1998: There is a remotely exploitable
929: problem in bootpd(8). (patch included).</a>
1.78 deraadt 930: <li><a href=errata23.html#tcpfix>Nov 13, 1998: There is a remote machine lockup
931: bug in the TCP decoding kernel. (patch included).</a>
1.190 mpech 932: <li><a href=errata23.html#resolver>August 31, 1998: A benign looking resolver
933: buffer overflow bug was re-introduced accidentally (patches included).</a>
934: <li><a href=errata23.html#chpass>Aug 2, 1998:
935: chpass(1) has a file descriptor leak which allows an
936: attacker to modify /etc/master.passwd.</a>
937: <li><a href=errata23.html#inetd>July 15, 1998: Inetd had a file descriptor leak.</a>
1.76 aaron 938: <li><a href=errata23.html#fdalloc>Jul 2, 1998: setuid and setgid processes
1.72 deraadt 939: should not be executed with fd slots 0, 1, or 2 free.
940: (patch included).</a>
1.76 aaron 941: <li><a href=errata23.html#xlib>June 6, 1998: Further problems with the X
1.71 deraadt 942: libraries (patches included).</a>
1.76 aaron 943: <li><a href=errata23.html#kill>May 17, 1998: kill(2) of setuid/setgid target
1.66 deraadt 944: processes too permissive (4th revision patch included).</a>
1.76 aaron 945: <li><a href=errata23.html#immutable>May 11, 1998: mmap() permits partial bypassing
1.60 deraadt 946: of immutable and append-only file flags. (patch included).</a>
1.190 mpech 947: <li><a href=errata23.html#ipsec>May 5, 1998: Incorrect handling of IPSEC packets
948: if IPSEC is enabled (patch included).</a>
1.76 aaron 949: <li><a href=errata23.html#xterm-xaw>May 1, 1998: Buffer overflow in xterm and Xaw
1.58 deraadt 950: (CERT advisory VB-98.04) (patch included).</a>
1.53 matthieu 951: </ul>
1.9 deraadt 952:
1.106 deraadt 953: <p>
954: <li>
1.58 deraadt 955: <a name=22></a>
1.235 miod 956:
1.110 deraadt 957: <h3><font color=#e00000>OpenBSD 2.2 Security Advisories</font></h3>
1.45 deraadt 958: These are the OpenBSD 2.2 advisories. All these problems are solved
1.55 deraadt 959: in <a href=23.html>OpenBSD 2.3</a>. Some of these problems
1.45 deraadt 960: still exist in other operating systems. (The supplied patches are for
961: OpenBSD 2.2; they may or may not work on OpenBSD 2.1).
1.9 deraadt 962:
1.96 deraadt 963: <p>
1.9 deraadt 964: <ul>
1.72 deraadt 965: <li><a href=errata22.html#ipsec>May 5, 1998: Incorrect handling of IPSEC
966: packets if IPSEC is enabled (patch included).</a>
967: <li><a href=errata22.html#xterm-xaw>May 1, 1998: Buffer overflow in xterm
968: and Xaw (CERT advisory VB-98.04) (patch included).</a>
969: <li><a href=errata22.html#uucpd>Apr 22, 1998: Buffer overflow in uucpd
970: (patch included).</a>
971: <li><a href=errata22.html#rmjob>Apr 22, 1998: Buffer mismanagement in lprm
972: (patch included).</a>
973: <li><a href=errata22.html#ping>Mar 31, 1998: Overflow in ping -R (patch included).</a>
974: <li><a href=errata22.html#named>Mar 30, 1998: Overflow in named fake-iquery
1.59 deraadt 975: (patch included).</a>
1.72 deraadt 976: <li><a href=errata22.html#mountd>Mar 2, 1998: Accidental NFS filesystem
977: export (patch included).</a>
1.112 philen 978: <li><a href="advisories/mmap.txt">Feb 26, 1998: Read-write mmap() flaw.</a>
1.72 deraadt 979: Revision 3 of the patch is available <a href=errata22.html#mmap>here</a>
1.112 philen 980: <li><a href="advisories/sourceroute.txt">Feb 19, 1998: Sourcerouted Packet
1.59 deraadt 981: Acceptance.</a>
1.50 deraadt 982: A patch is available <a href=errata22.html#sourceroute>here</a>.
1.122 rohee 983: <li><a href=errata22.html#ruserok>Feb 13, 1998: Setuid coredump & Ruserok()
1.72 deraadt 984: flaw (patch included).</a>
985: <li><a href=errata22.html#ldso>Feb 9, 1998: MIPS ld.so flaw (patch included).</a>
1.1 deraadt 986: </ul>
987:
1.106 deraadt 988: <p>
989: <li>
1.58 deraadt 990: <a name=21></a>
1.235 miod 991:
1.110 deraadt 992: <h3><font color=#e00000>OpenBSD 2.1 Security Advisories</font></h3>
1.52 deraadt 993: These are the OpenBSD 2.1 advisories. All these problems are solved
994: in <a href=22.html>OpenBSD 2.2</a>. Some of these problems still
995: exist in other operating systems. (If you are running OpenBSD 2.1, we
996: would strongly recommend an upgrade to the newest release, as this
997: patch list only attempts at fixing the most important security
998: problems. In particular, OpenBSD 2.2 fixes numerous localhost
999: security problems. Many of those problems were solved in ways which
1000: make it hard for us to provide patches).
1001:
1.96 deraadt 1002: <p>
1.52 deraadt 1003: <ul>
1.112 philen 1004: <li><a href="advisories/signals.txt">Sep 15, 1997: Deviant Signals (patch included)</a>
1005: <li><a href="advisories/rfork.txt">Aug 2, 1997: Rfork() system call flaw
1.59 deraadt 1006: (patch included)</a>
1.112 philen 1007: <li><a href="advisories/procfs.txt">Jun 24, 1997: Procfs flaws (patch included)</a>
1.52 deraadt 1008: </ul>
1.51 deraadt 1009:
1.106 deraadt 1010: <p>
1011: <li>
1012: <a name=20></a>
1.235 miod 1013:
1.110 deraadt 1014: <h3><font color=#e00000>OpenBSD 2.0 Security Advisories</font></h3>
1.99 deraadt 1015: These are the OpenBSD 2.0 advisories. All these problems are solved
1016: in <a href=21.html>OpenBSD 2.1</a>. Some of these problems still
1017: exist in other operating systems. (If you are running OpenBSD 2.0, we
1018: commend you for being there back in the old days!, but you're really
1019: missing out if you don't install a new version!)
1020:
1021: <p>
1022: <ul>
1.112 philen 1023: <li><a href="advisories/res_random.txt">April 22, 1997: Predictable IDs in the
1.99 deraadt 1024: resolver (patch included)</a>
1025: <li>Many others... if people can hunt them down, please let me know
1026: and we'll put them up here.
1027: </ul>
1028:
1.106 deraadt 1029: </dl>
1.51 deraadt 1030: <p>
1.106 deraadt 1031:
1032: <a name=watching></a>
1.110 deraadt 1033: <li><h3><font color=#e00000>Watching our Changes</font></h3><p>
1.106 deraadt 1034:
1.21 deraadt 1035: Since we take a proactive stance with security, we are continually
1036: finding and fixing new security problems. Not all of these problems
1.80 espie 1037: get widely reported because (as stated earlier) many of them are not
1.45 deraadt 1038: confirmed to be exploitable; many simple bugs we fix do turn out to
1039: have security consequences we could not predict. We do not have the
1040: time resources to make these changes available in the above format.<p>
1.21 deraadt 1041:
1042: Thus there are usually minor security fixes in the current source code
1043: beyond the previous major OpenBSD release. We make a limited
1.45 deraadt 1044: guarantee that these problems are of minimal impact and unproven
1.44 ian 1045: exploitability. If we discover that a problem definitely matters for
1.45 deraadt 1046: security, patches will show up here <strong>VERY</strong> quickly.<p>
1.21 deraadt 1047:
1.45 deraadt 1048: People who are really concerned with security can do a number of
1049: things:<p>
1.21 deraadt 1050:
1051: <ul>
1052: <li>If you understand security issues, watch our
1.27 deraadt 1053: <a href=mail.html>source-changes mailing list</a> and keep an
1.23 deraadt 1054: eye out for things which appear security related. Since
1.21 deraadt 1055: exploitability is not proven for many of the fixes we make,
1056: do not expect the relevant commit message to say "SECURITY FIX!".
1057: If a problem is proven and serious, a patch will be available
1058: here very shortly after.
1.161 horacio 1059: <li>In addition to source changes, you can watch our <a href="mail.html">
1.160 ericj 1060: security-announce mailing list</a> which will notify you for every
1.186 ian 1061: security related item that the OpenBSD team deems as a possible threat,
1.160 ericj 1062: and instruct you on how to patch the problem.
1.21 deraadt 1063: <li>Track our current source code tree, and teach yourself how to do a
1.29 deraadt 1064: complete system build from time to time (read /usr/src/Makefile
1065: carefully). Users can make the assumption that the current
1066: source tree always has stronger security than the previous release.
1.45 deraadt 1067: However, building your own system from source code is not trivial;
1.265 miod 1068: it is nearly 600MB of source code, and problems do occur as we
1.45 deraadt 1069: transition between major releases.
1.115 ericj 1070: <li>Install a binary snapshot for your
1.80 espie 1071: architecture, which are made available fairly often. For
1.29 deraadt 1072: instance, an i386 snapshot is typically made available weekly.
1.21 deraadt 1073: </ul>
1074:
1.9 deraadt 1075: <p>
1.153 jufi 1076: <a name=reporting></a>
1.110 deraadt 1077: <li><h3><font color=#e00000>Reporting problems</font></h3><p>
1.3 deraadt 1078:
1.5 deraadt 1079: <p> If you find a new security problem, you can mail it to
1.6 deraadt 1080: <a href=mailto:deraadt@openbsd.org>deraadt@openbsd.org</a>.
1.7 deraadt 1081: <br>
1.5 deraadt 1082: If you wish to PGP encode it (but please only do so if privacy is very
1.112 philen 1083: urgent, since it is inconvenient) use this <a href="advisories/pgpkey.txt">pgp key</a>.
1.5 deraadt 1084:
1.107 deraadt 1085: <p>
1086: <a name=papers></a>
1.110 deraadt 1087: <li><h3><font color=#e00000>Further Reading</font></h3><p>
1.107 deraadt 1088:
1089: A number of papers have been written by OpenBSD team members, about security
1090: related changes they have done in OpenBSD. The postscript versions of these
1.108 deraadt 1091: documents are available as follows.<p>
1.107 deraadt 1092:
1093: <ul>
1.113 deraadt 1094: <li>A Future-Adaptable Password Scheme.<br>
1.118 deraadt 1095: <a href=events.html#usenix99>Usenix 1999</a>,
1.153 jufi 1096: by <a href=mailto:provos@openbsd.org>Niels Provos</a>,
1.113 deraadt 1097: <a href=mailto:dm@openbsd.org>David Mazieres</a>.<br>
1.107 deraadt 1098: <a href=papers/bcrypt-paper.ps>paper</a> and
1099: <a href=papers/bcrypt-slides.ps>slides</a>.
1.113 deraadt 1100: <p>
1101: <li>Cryptography in OpenBSD: An Overview.<br>
1.118 deraadt 1102: <a href=events.html#usenix99>Usenix 1999</a>,
1.113 deraadt 1103: by <a href=mailto:deraadt@openbsd.org>Theo de Raadt</a>,
1104: <a href=mailto:niklas@openbsd.org>Niklas Hallqvist</a>,
1105: <a href=mailto:art@openbsd.org>Artur Grabowski</a>,
1106: <a href=mailto:angelos@openbsd.org>Angelos D. Keromytis</a>,
1107: <a href=mailto:provos@openbsd.org>Niels Provos</a>.<br>
1.107 deraadt 1108: <a href=papers/crypt-paper.ps>paper</a> and
1109: <a href=papers/crypt-slides.ps>slides</a>.
1.113 deraadt 1110: <p>
1111: <li>strlcpy and strlcat -- consistent, safe, string copy and concatenation.<br>
1.118 deraadt 1112: <a href=events.html#usenix99>Usenix 1999</a>,
1.113 deraadt 1113: by <a href=mailto:millert@openbsd.org>Todd C. Miller</a>,
1114: <a href=mailto:deraadt@openbsd.org>Theo de Raadt</a>.<br>
1.109 deraadt 1115: <a href=papers/strlcpy-paper.ps>paper</a> and
1116: <a href=papers/strlcpy-slides.ps>slides</a>.
1.113 deraadt 1117: <p>
1.118 deraadt 1118: <li>Dealing with Public Ethernet Jacks-Switches, Gateways, and Authentication.<br>
1119: <a href=events.html#lisa99>LISA 1999</a>,
1120: by <a href=mailto:beck@openbsd.org>Bob Beck</a>.<br>
1121: <a href=papers/authgw-paper.ps>paper</a> and
1122: <a href=papers/authgw-slides.ps>slides</a>.
1123: <p>
1.153 jufi 1124: <li>Encrypting Virtual Memory<br>
1.142 deraadt 1125: <a href=events.html#sec2000>Usenix Security 2000</a>,
1126: <a href=mailto:provos@openbsd.org>Niels Provos</a>.<br>
1.143 provos 1127: <a href=papers/swapencrypt.ps>paper</a> and
1128: <a href=papers/swapencrypt-slides.ps>slides</a>.
1.142 deraadt 1129: <p>
1.107 deraadt 1130: </ul>
1131:
1.106 deraadt 1132: </dl>
1133:
1.2 deraadt 1134: <hr>
1.68 pauls 1135: <a href=index.html><img height=24 width=24 src=back.gif border=0 alt=OpenBSD></a>
1.24 deraadt 1136: <a href=mailto:www@openbsd.org>www@openbsd.org</a>
1137: <br>
1.270 ! jose 1138: <small>$OpenBSD: security.html,v 1.269 2004/01/21 20:47:55 jose Exp $</small>
1.1 deraadt 1139:
1.24 deraadt 1140: </body>
1141: </html>
![[BACK]](/icons/back.gif){kind=icon}
Return to security.html CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / www