Annotation of www/security.html, Revision 1.230
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>,
51: <a href="#32">3.2</a>.
1.114 philen 52: </td>
53: </tr>
54: </table>
1.56 deraadt 55: <hr>
56:
1.106 deraadt 57: <dl>
58: <a name=goals></a>
1.110 deraadt 59: <li><h3><font color=#e00000>Goal</font></h3><p>
1.22 deraadt 60:
1.14 deraadt 61: OpenBSD believes in strong security. Our aspiration is to be NUMBER
1.22 deraadt 62: ONE in the industry for security (if we are not already there). Our
63: open software development model permits us to take a more
64: uncompromising view towards increased security than Sun, SGI, IBM, HP,
65: or other vendors are able to. We can make changes the vendors would
1.27 deraadt 66: not make. Also, since OpenBSD is exported with <a href=crypto.html>
1.45 deraadt 67: cryptography</a>, we are able to take cryptographic approaches towards
68: fixing security problems.<p>
1.18 deraadt 69:
1.106 deraadt 70: <a name=disclosure></a>
1.110 deraadt 71: <li><h3><font color=#e00000>Full Disclosure</font></h3><p>
1.106 deraadt 72:
1.45 deraadt 73: Like many readers of the
1.196 jufi 74: <a href="http://online.securityfocus.com/archive/1">
1.18 deraadt 75: BUGTRAQ mailing list</a>,
1.106 deraadt 76: we believe in full disclosure of security problems. In the
77: operating system arena, we were probably the first to embrace
78: the concept. Many vendors, even of free software, still try
79: to hide issues from their users.<p>
80:
81: Security information moves very fast in cracker circles. On the other
82: hand, our experience is that coding and releasing of proper security
83: fixes typically requires about an hour of work -- very fast fix
84: turnaround is possible. Thus we think that full disclosure helps the
85: people who really care about security.<p>
86:
1.153 jufi 87: <a name=process></a>
1.110 deraadt 88: <li><h3><font color=#e00000>Audit Process</font></h3><p>
1.15 deraadt 89:
1.12 deraadt 90: Our security auditing team typically has between six and twelve
1.45 deraadt 91: members who continue to search for and fix new security holes. We
92: have been auditing since the summer of 1996. The process we follow to
93: increase security is simply a comprehensive file-by-file analysis of
1.106 deraadt 94: every critical software component. We are not so much looking for
95: security holes, as we are looking for basic software bugs, and if
1.138 deraadt 96: years later someone discovers the problem used to be a security
1.106 deraadt 97: issue, and we fixed it because it was just a bug, well, all the
98: better. Flaws have been found in just about every area of the system.
99: Entire new classes of security problems have been found during our
100: audit, and often source code which had been audited earlier needs
101: re-auditing with these new flaws in mind. Code often gets audited
102: multiple times, and by multiple people with different auditing
103: skills.<p>
1.12 deraadt 104:
1.94 deraadt 105: Some members of our security auditing team worked for Secure Networks,
106: the company that made the industry's premier network security scanning
107: software package Ballista (Secure Networks got purchased by Network
108: Associates, Ballista got renamed to Cybercop Scanner, and well...)
109: That company did a lot of security research, and thus fit in well
1.106 deraadt 110: with the OpenBSD stance. OpenBSD passed Ballista's tests with flying
111: colours since day 1.<p>
1.31 deraadt 112:
1.34 deraadt 113: Another facet of our security auditing process is its proactiveness.
1.45 deraadt 114: In most cases we have found that the determination of exploitability
115: is not an issue. During our ongoing auditing process we find many
116: bugs, and endeavor to fix them even though exploitability is not
117: proven. We fix the bug, and we move on to find other bugs to fix. We
118: have fixed many simple and obvious careless programming errors in code
119: and only months later discovered that the problems were in fact
120: exploitable. (Or, more likely someone on
1.197 jufi 121: <a href="http://online.securityfocus.com/archive/1">BUGTRAQ</a>
1.45 deraadt 122: would report that other operating systems were vulnerable to a `newly
123: discovered problem', and then it would be discovered that OpenBSD had
124: been fixed in a previous release). In other cases we have been saved
125: from full exploitability of complex step-by-step attacks because we
126: had fixed one of the intermediate steps. An example of where we
1.94 deraadt 127: managed such a success is the lpd advisory that Secure Networks put out.
128: <p>
1.29 deraadt 129:
1.110 deraadt 130: <li><h3><font color=#e00000>The Reward</font></h3><p>
1.106 deraadt 131:
1.45 deraadt 132: Our proactive auditing process has really paid off. Statements like
1.35 deraadt 133: ``This problem was fixed in OpenBSD about 6 months ago'' have become
1.45 deraadt 134: commonplace in security forums like
1.197 jufi 135: <a href="http://online.securityfocus.com/archive/1">BUGTRAQ</a>.<p>
1.35 deraadt 136:
1.45 deraadt 137: The most intense part of our security auditing happened immediately
1.80 espie 138: before the OpenBSD 2.0 release and during the 2.0->2.1 transition,
1.45 deraadt 139: over the last third of 1996 and first half of 1997. Thousands (yes,
140: thousands) of security issues were fixed rapidly over this year-long
141: period; bugs like the standard buffer overflows, protocol
142: implementation weaknesses, information gathering, and filesystem
143: races. Hence most of the security problems that we encountered were
144: fixed before our 2.1 release, and then a far smaller number needed
145: fixing for our 2.2 release. We do not find as many problems anymore,
146: it is simply a case of diminishing returns. Recently the security
147: problems we find and fix tend to be significantly more obscure or
148: complicated. Still we will persist for a number of reasons:<p>
1.36 deraadt 149:
1.35 deraadt 150: <ul>
1.45 deraadt 151: <li>Occasionally we find a simple problem we missed earlier. Doh!
1.35 deraadt 152: <li>Security is like an arms race; the best attackers will continue
1.45 deraadt 153: to search for more complicated exploits, so we will too.
154: <li>Finding and fixing subtle flaws in complicated software is
155: a lot of fun.
1.35 deraadt 156: </ul>
1.106 deraadt 157: <p>
1.15 deraadt 158:
1.14 deraadt 159: The auditing process is not over yet, and as you can see we continue
1.28 deraadt 160: to find and fix new security flaws.<p>
1.12 deraadt 161:
1.106 deraadt 162: <a name=default></a>
1.110 deraadt 163: <li><h3><font color=#e00000>"Secure by Default"</font></h3><p>
1.106 deraadt 164:
165: To ensure that novice users of OpenBSD do not need to become security
166: experts overnight (a viewpoint which other vendors seem to have), we
167: ship the operating system in a Secure by Default mode. All non-essential
168: services are disabled. As the user/administrator becomes more familiar
169: with the system, he will discover that he has to enable daemons and other
170: parts of the system. During the process of learning how to enable a new
171: service, the novice is more likely to learn of security considerations.<p>
172:
173: This is in stark contrast to the increasing number of systems that
174: ship with NFS, mountd, web servers, and various other services enabled
175: by default, creating instantaneous security problems for their users
176: within minutes after their first install.<p>
177:
1.153 jufi 178: <a name=crypto></a>
1.110 deraadt 179: <li><h3><font color=#e00000>Cryptography</font></h3><p>
1.106 deraadt 180:
181: And of course, since the OpenBSD project is based in Canada, it is possible
182: for us to integrate cryptography. For more information, read the page
1.116 deraadt 183: outlining <a href=crypto.html>what we have done with cryptography</a>.</p>
1.106 deraadt 184:
1.110 deraadt 185: <li><h3><font color=#e00000>Advisories</font></h3><p>
1.106 deraadt 186:
187: <dl>
188:
189: <li>
1.224 deraadt 190: <a name=32></a>
191:
192: <h3><font color=#e00000>OpenBSD 3.2 Security Advisories</font></h3>
193: These are the OpenBSD 3.2 advisories -- all these problems are solved
194: in <a href=anoncvs.html>OpenBSD current</a> and the
195: <a href=stable.html>patch branch</a>.
196:
197: <p>
198: <ul>
1.230 ! millert 199: <li><a href=errata.html#named>November 14, 2002:
! 200: A buffer overflow exists in named(8) that could lead to a
! 201: remote crash or code execution as user named in a chroot jail.</a>
1.229 miod 202: <li><a href=errata.html#smrsh>November 6, 2002:
203: An attacker can bypass smrsh(8)'s restrictions and execute
204: arbitrary commands with the privileges of his own account.</a>
1.228 miod 205: <li><a href=errata.html#kadmin>October 21, 2002:
206: A buffer overflow can occur in the kadmind(8) daemon, leading
207: to possible remote crash or exploit.</a>
1.224 deraadt 208: </ul>
209:
1.227 miod 210: <p>
211:
212: <li>
1.203 deraadt 213: <a name=31></a>
214:
215: <h3><font color=#e00000>OpenBSD 3.1 Security Advisories</font></h3>
216: These are the OpenBSD 3.1 advisories -- all these problems are solved
217: in <a href=anoncvs.html>OpenBSD current</a> and the
218: <a href=stable.html>patch branch</a>.
219:
220: <p>
221: <ul>
1.230 ! millert 222: <li><a href=errata31.html#named>November 14, 2002:
! 223: A buffer overflow exists in named(8) that could lead to a
! 224: remote crash or code execution as user named in a chroot jail.</a>
1.229 miod 225: <li><a href=errata31.html#kernresource>November 6, 2002:
226: Incorrect argument checking in the getitimer(2) system call
227: may allow an attacker to crash the system.</a>
228: <li><a href=errata31.html#smrsh>November 6, 2002:
229: An attacker can bypass smrsh(8)'s restrictions and execute
230: arbitrary commands with the privileges of his own account.</a>
1.226 miod 231: <li><a href=errata31.html#kadmin>October 21, 2002:
232: A buffer overflow can occur in the kadmind(8) daemon, leading
233: to possible remote crash or exploit.</a>
1.224 deraadt 234: <li><a href=errata31.html#kerntime>October 2, 2002:
1.222 jason 235: Incorrect argument checking in the setitimer(2) system call
236: may allow an attacker to write to kernel memory.</a>
1.224 deraadt 237: <li><a href=errata31.html#scarg>August 11, 2002:
1.221 provos 238: An insufficient boundary check in the select system call
1.220 miod 239: allows an attacker to overwrite kernel memory and execute arbitrary code
240: in kernel context.</a>
1.224 deraadt 241: <li><a href=errata31.html#ssl>July 30, 2002:
1.218 miod 242: Several remote buffer overflows can occur in the SSL2 server and SSL3
243: client of the ssl(8) library, as in the ASN.1 parser code in the
244: crypto(3) library, all of them being potentially remotely
245: exploitable.</a>
1.224 deraadt 246: <li><a href=errata31.html#xdr>July 29, 2002:
1.218 miod 247: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
248: possible remote crash.</a>
1.224 deraadt 249: <li><a href=errata31.html#pppd>July 29, 2002:
1.218 miod 250: A race condition exists in the pppd(8) daemon which may cause it to
251: alter the file permissions of an arbitrary file.</a>
1.224 deraadt 252: <li><a href=errata31.html#isakmpd>July 5, 2002:
1.218 miod 253: Receiving IKE payloads out of sequence can cause isakmpd(8) to
254: crash.</a>
1.224 deraadt 255: <li><a href=errata31.html#ktrace>June 27, 2002:
1.215 miod 256: The kernel would let any user ktrace set[ug]id processes.</a>
1.224 deraadt 257: <li><a href=errata31.html#modssl>June 26, 2002:
1.213 miod 258: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 259: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.224 deraadt 260: <li><a href=errata31.html#resolver>June 25, 2002:
1.212 millert 261: A potential buffer overflow in the DNS resolver has been found.</a>
1.224 deraadt 262: <li><a href=errata31.html#sshd>June 24, 2002:
1.216 deraadt 263: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 264: input validation error that can result in an integer overflow and
265: privilege escalation.</a>
1.224 deraadt 266: <li><a href=errata31.html#httpd>June 19, 2002:
1.211 miod 267: A buffer overflow can occur during the interpretation of chunked
268: encoding in httpd(8), leading to possible remote crash.</a>
1.224 deraadt 269: <li><a href=errata31.html#sshbsdauth>May 22, 2002:
1.209 markus 270: Under certain conditions, on systems using YP with netgroups
271: in the password database, it is possible that sshd(8) does
272: ACL checks for the requested user name but uses the password
273: database entry of a different user for authentication. This
274: means that denied users might authenticate successfully
275: while permitted users could be locked out.</a>
1.224 deraadt 276: <li><a href=errata31.html#fdalloc2>May 8, 2002:
1.208 millert 277: A race condition exists that could defeat the kernel's
278: protection of fd slots 0-2 for setuid processes.</a>
1.224 deraadt 279: <li><a href=errata31.html#sudo>April 25, 2002:
1.205 millert 280: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.224 deraadt 281: <li><a href=errata31.html#sshafs>April 22, 2002:
1.205 millert 282: A local user can gain super-user privileges due to a buffer
283: overflow in sshd(8) if AFS has been configured on the system
284: or if KerberosTgtPassing or AFSTokenPassing has been enabled
285: in the sshd_config file.</a>
1.203 deraadt 286: </ul>
287:
288: <p>
289:
290: <li>
1.187 deraadt 291: <a name=30></a>
292:
293: <h3><font color=#e00000>OpenBSD 3.0 Security Advisories</font></h3>
294: These are the OpenBSD 3.0 advisories -- all these problems are solved
295: in <a href=anoncvs.html>OpenBSD current</a> and the
296: <a href=stable.html>patch branch</a>.
297:
298: <p>
299: <ul>
1.230 ! millert 300: <li><a href=errata30.html#named>November 14, 2002:
! 301: A buffer overflow exists in named(8) that could lead to a
! 302: remote crash or code execution as user named in a chroot jail.</a>
1.229 miod 303: <li><a href=errata30.html#kernresource>November 6, 2002:
304: Incorrect argument checking in the getitimer(2) system call
305: may allow an attacker to crash the system.</a>
306: <li><a href=errata30.html#smrsh>November 6, 2002:
307: An attacker can bypass smrsh(8)'s restrictions and execute
308: arbitrary commands with the privileges of his own account.</a>
1.226 miod 309: <li><a href=errata30.html#kadmin>October 21, 2002:
310: A buffer overflow can occur in the kadmind(8) daemon, leading
311: to possible remote crash or exploit.</a>
1.223 miod 312: <li><a href=errata30.html#kerntime>October 7, 2002:
313: Incorrect argument checking in the setitimer(2) system call
314: may allow an attacker to write to kernel memory.</a>
1.220 miod 315: <li><a href=errata30.html#scarg>August 11, 2002:
316: An insufficient boundary check in the select and poll system calls
317: allows an attacker to overwrite kernel memory and execute arbitrary code
318: in kernel context.</a>
1.218 miod 319: <li><a href=errata30.html#ssl>July 30, 2002:
320: Several remote buffer overflows can occur in the SSL2 server and SSL3
321: client of the ssl(8) library, as in the ASN.1 parser code in the
322: crypto(3) library, all of them being potentially remotely
323: exploitable.</a>
324: <li><a href=errata30.html#xdr>July 29, 2002:
325: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
326: possible remote crash.</a>
327: <li><a href=errata30.html#pppd>July 29, 2002:
328: A race condition exists in the pppd(8) daemon which may cause it to
329: alter the file permissions of an arbitrary file.</a>
1.219 miod 330: <li><a href=errata30.html#isakmpd2>July 5, 2002:
1.218 miod 331: Receiving IKE payloads out of sequence can cause isakmpd(8) to
332: crash.</a>
1.215 miod 333: <li><a href=errata30.html#ktrace>June 27, 2002:
334: The kernel would let any user ktrace set[ug]id processes.</a>
1.212 millert 335: <li><a href=errata30.html#resolver>June 25, 2002:
336: A potential buffer overflow in the DNS resolver has been found.</a>
1.213 miod 337: <li><a href=errata30.html#sshdauth>June 24, 2002:
1.216 deraadt 338: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 339: input validation error that can result in an integer overflow and
340: privilege escalation.</a>
341: <li><a href=errata30.html#modssl>June 24, 2002:
342: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 343: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.213 miod 344: <li><a href=errata30.html#httpd>June 19, 2002:
345: A buffer overflow can occur during the interpretation of chunked
346: encoding in httpd(8), leading to possible remote crash.</a>
1.208 millert 347: <li><a href=errata30.html#fdalloc2>May 8, 2002:
348: A race condition exists that could defeat the kernel's
349: protection of fd slots 0-2 for setuid processes.</a>
1.205 millert 350: <li><a href=errata30.html#sudo2>April 25, 2002:
351: A bug in sudo may allow an attacker to corrupt the heap.</a>
352: <li><a href=errata30.html#sshafs>April 22, 2002:
353: A local user can gain super-user privileges due to a buffer
354: overflow in sshd(8) if AFS has been configured on the system
355: or if KerberosTgtPassing or AFSTokenPassing has been enabled
356: in the sshd_config file.</a>
1.203 deraadt 357: <li><a href=errata30.html#mail>April 11, 2002:
1.202 millert 358: The mail(1) was interpreting tilde escapes even when invoked
359: in non-interactive mode. As mail(1) is called as root from cron,
360: this can lead to a local root compromise.</a>
1.203 deraadt 361: <li><a href=errata30.html#approval>March 19, 2002:
1.201 millert 362: Under certain conditions, on systems using YP with netgroups in
363: the password database, it is possible for the rexecd(8) and rshd(8)
364: daemons to execute a shell from a password database entry for a
365: different user. Similarly, atrun(8) may change to the wrong
366: home directory when running jobs.</a>
1.203 deraadt 367: <li><a href=errata30.html#zlib>March 13, 2002:
1.200 millert 368: A potential double free() exists in the zlib library;
369: this is not exploitable on OpenBSD.
370: The kernel also contains a copy of zlib; it is not
371: currently known if the kernel zlib is exploitable.</a>
1.203 deraadt 372: <li><a href=errata30.html#openssh>March 8, 2002:
1.198 millert 373: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 374: may allow a local user to gain super-user privileges.</a>
1.203 deraadt 375: <li><a href=errata30.html#ptrace>January 21, 2002:
1.192 jason 376: A race condition between the ptrace(2) and execve(2) system calls
377: allows an attacker to modify the memory contents of suid/sgid
378: processes which could lead to compromise of the super-user account.</a>
1.203 deraadt 379: <li><a href=errata30.html#sudo>January 17, 2002:
1.191 millert 380: There is a security hole in sudo(8) that can be exploited
381: when the Postfix sendmail replacement is installed that may
382: allow an attacker on the local host to gain root privileges.</a>
1.203 deraadt 383: <li><a href=errata30.html#lpd>November 28, 2001:
1.189 millert 384: An attacker can trick a machine running the lpd daemon into
385: creating new files in the root directory from a machine with
386: remote line printer access.</a>
1.203 deraadt 387: <li><a href=errata30.html#vi.recover>November 13, 2001:
1.188 millert 388: The vi.recover script can be abused in such a way as
389: to cause arbitrary zero-length files to be removed.</a>
1.203 deraadt 390: <li><a href=errata30.html#pf>November 13, 2001:
1.190 mpech 391: pf(4) was incapable of dealing with certain ipv6 icmp packets,
392: resulting in a crash.</a>
1.203 deraadt 393: <li><a href=errata30.html#sshd>November 12, 2001:
1.190 mpech 394: A security hole that may allow an attacker to partially authenticate
395: if -- and only if -- the administrator has enabled KerberosV.</a>
1.187 deraadt 396: </ul>
1.217 miod 397: </dl>
398: <p>
399: OpenBSD 2.9 and earlier releases are not supported anymore. The following
400: paragraphs only list advisories issued while they were maintained; these
401: releases are likely to be affected by the advisories for more recent releases.
402: <br>
1.187 deraadt 403:
404: <p>
1.217 miod 405: <dl>
1.187 deraadt 406: <li>
1.173 deraadt 407: <a name=29></a>
408:
409: <h3><font color=#e00000>OpenBSD 2.9 Security Advisories</font></h3>
410: These are the OpenBSD 2.9 advisories -- all these problems are solved
411: in <a href=anoncvs.html>OpenBSD current</a> and the
1.179 jufi 412: <a href=stable.html>patch branch</a>.
1.173 deraadt 413:
414: <p>
415: <ul>
1.212 millert 416: <li><a href=errata29.html#resolver>June 25, 2002:
417: A potential buffer overflow in the DNS resolver has been found.</a>
1.208 millert 418: <li><a href=errata29.html#fdalloc2>May 8, 2002:
419: A race condition exists that could defeat the kernel's
420: protection of fd slots 0-2 for setuid processes.</a>
1.207 millert 421: <li><a href=errata29.html#sudo2>April 25, 2002:
422: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.206 millert 423: <li><a href=errata29.html#sshafs>April 22, 2002:
424: A local user can gain super-user privileges due to a buffer
425: overflow in sshd(8) if AFS has been configured on the system
426: or if KerberosTgtPassing or AFSTokenPassing has been enabled
427: in the sshd_config file.</a>
1.202 millert 428: <li><a href=errata29.html#mail>April 11, 2002:
429: The mail(1) was interpreting tilde escapes even when invoked
430: in non-interactive mode. As mail(1) is called as root from cron,
431: this can lead to a local root compromise.</a>
1.200 millert 432: <li><a href=errata29.html#zlib>March 13, 2002:
433: A potential double free() exists in the zlib library;
434: this is not exploitable on OpenBSD.
435: The kernel also contains a copy of zlib; it is not
436: currently known if the kernel zlib is exploitable.</a>
1.198 millert 437: <li><a href=errata29.html#openssh>March 8, 2002:
438: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 439: may allow a local user to gain super-user privileges.</a>
1.198 millert 440: <li><a href=errata29.html#ptrace>January 21, 2002:
441: A race condition between the ptrace(2) and execve(2) system calls
442: allows an attacker to modify the memory contents of suid/sgid
443: processes which could lead to compromise of the super-user account.</a>
1.191 millert 444: <li><a href=errata29.html#sudo>January 17, 2002:
445: There is a security hole in sudo(8) that can be exploited
446: when the Postfix sendmail replacement is installed that may
447: allow an attacker on the local host to gain root privileges.</a>
1.189 millert 448: <li><a href=errata29.html#lpd2>November 28, 2001:
449: An attacker can trick a machine running the lpd daemon into
450: creating new files in the root directory from a machine with
451: remote line printer access.</a>
1.190 mpech 452: <li><a href=errata29.html#vi.recover>November 13, 2001:
453: The vi.recover script can be abused in such a way as
454: to cause arbitrary zero-length files to be removed.</a>
1.185 deraadt 455: <li><a href=errata29.html#uucp>September 11, 2001:
1.184 millert 456: A security hole exists in uuxqt(8) that may allow an
457: attacker to gain root privileges.</a>
1.185 deraadt 458: <li><a href=errata29.html#lpd>August 29, 2001:
1.183 millert 459: A security hole exists in lpd(8) that may allow an
460: attacker to gain root privileges if lpd is running.</a>
1.185 deraadt 461: <li><a href=errata29.html#sendmail2>August 21, 2001:
1.181 millert 462: A security hole exists in sendmail(8) that may allow an
463: attacker on the local host to gain root privileges.</a>
1.185 deraadt 464: <li><a href=errata29.html#nfs>July 30, 2001:
1.180 jason 465: A kernel buffer overflow in the NFS code can be used to execute
466: arbitrary code by users with mount privileges (only root by
1.181 millert 467: default).</a>
1.185 deraadt 468: <li><a href=errata29.html#kernexec>June 15, 2001:
1.178 aaron 469: A race condition in the kernel can lead to local root compromise.</a>
1.185 deraadt 470: <li><a href=errata29.html#sshcookie>June 12, 2001:
1.177 markus 471: sshd(8) allows users to delete arbitrary files named "cookies"
472: if X11 forwarding is enabled. X11 forwarding is disabled
473: by default.</a>
1.185 deraadt 474: <li><a href=errata29.html#fts>May 30, 2001:
1.176 millert 475: Programs using the fts routines can be tricked into changing
476: into the wrong directory.</a>
1.185 deraadt 477: <li><a href=errata29.html#sendmail>May 29, 2001:
1.174 millert 478: Sendmail signal handlers contain unsafe code,
479: leading to numerous race conditions.</a>
1.173 deraadt 480: </ul>
481:
482: <p>
483: <li>
1.152 deraadt 484: <a name=28></a>
485:
486: <h3><font color=#e00000>OpenBSD 2.8 Security Advisories</font></h3>
487: These are the OpenBSD 2.8 advisories -- all these problems are solved
1.154 millert 488: in <a href=anoncvs.html>OpenBSD current</a> and the
1.179 jufi 489: <a href=stable.html>patch branch</a>.
1.152 deraadt 490:
491: <p>
492: <ul>
1.184 millert 493: <li><a href=errata28.html#uucp>September 11, 2001:
494: A security hole exists in uuxqt(8) that may allow an
495: attacker to gain root privileges.</a>
1.183 millert 496: <li><a href=errata28.html#lpd>August 29, 2001:
497: A security hole exists in lpd(8) that may allow an
498: attacker to gain root privileges if lpd is running.</a>
1.181 millert 499: <li><a href=errata28.html#sendmail2>August 21, 2001:
500: A security hole exists in sendmail(8) that may allow an
501: attacker on the local host to gain root privileges.</a>
1.178 aaron 502: <li><a href=errata28.html#kernexec>June 15, 2001:
503: A race condition in the kernel can lead to local root compromise.</a>
1.176 millert 504: <li><a href=errata28.html#fts>May 30, 2001:
505: Programs using the fts routines can be tricked into changing
506: into the wrong directory.</a>
1.175 millert 507: <li><a href=errata28.html#sendmail>May 29, 2001:
508: Sendmail signal handlers contain unsafe code,
509: leading to numerous race conditions.</a>
1.173 deraadt 510: <li><a href=errata28.html#ipf_frag>Apr 23, 2001:
1.172 ericj 511: IPF contains a serious bug with its handling of fragment cacheing.</a>
1.173 deraadt 512: <li><a href=errata28.html#glob_limit>Apr 23, 2001:
1.172 ericj 513: ftpd(8) contains a potential DoS relating to glob(3).</a>
1.173 deraadt 514: <li><a href=errata28.html#glob>Apr 10, 2001:
1.170 ericj 515: The glob(3) library call contains multiple buffer overflows.</a>
1.173 deraadt 516: <li><a href=errata28.html#readline>Mar 18, 2001:
1.169 millert 517: The readline library creates history files with permissive modes based on the user's umask.</a>
1.173 deraadt 518: <li><a href=errata28.html#ipsec_ah>Mar 2, 2001:
1.167 ericj 519: Insufficient checks in the IPSEC AH IPv4 option handling code can lead to a buffer overrun in the kernel.</a>
1.173 deraadt 520: <li><a href=errata28.html#userldt>Mar 2, 2001:
1.168 horacio 521: The <b>USER_LDT</b> kernel option allows an attacker to gain access to privileged areas of kernel memory.</a>
1.173 deraadt 522: <li><a href=errata28.html#sudo>Feb 22, 2001:
1.171 millert 523: a non-exploitable buffer overflow was fixed in sudo(8).</a>
1.173 deraadt 524: <li><a href=errata28.html#named>Jan 29, 2001:
1.163 jason 525: merge named(8) with ISC BIND 4.9.8-REL, which fixes some buffer vulnerabilities.</a>
1.173 deraadt 526: <li><a href=errata28.html#rnd>Jan 22, 2001:
1.162 jason 527: rnd(4) did not use all of its input when written to.</a>
1.173 deraadt 528: <li><a href=errata28.html#xlock>Dec 22, 2000:
1.159 ericj 529: xlock(1)'s authentication was re-done to authenticate via a named pipe. (patch and new xlock binaries included).</a>
1.173 deraadt 530: <li><a href=errata28.html#procfs>Dec 18, 2000:
1.157 ericj 531: Procfs contains numerous overflows. Procfs is not used by default in OpenBSD. (patch included).</a>
1.173 deraadt 532: <li><a href=errata28.html#kerberos2>Dec 10, 2000:
1.156 deraadt 533: Another problem exists in KerberosIV libraries (patch included).</a>
1.173 deraadt 534: <li><a href=errata28.html#kerberos>Dec 7, 2000:
1.155 deraadt 535: A set of problems in KerberosIV exist (patch included).</a>
1.173 deraadt 536: <li><a href=errata28.html#ftpd>Dec 4, 2000:
1.154 millert 537: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.152 deraadt 538: </ul>
539:
540: <p>
541: <li>
1.124 deraadt 542: <a name=27></a>
543:
544: <h3><font color=#e00000>OpenBSD 2.7 Security Advisories</font></h3>
545: These are the OpenBSD 2.7 advisories -- all these problems are solved
546: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
547: OpenBSD 2.6 advisories listed below are fixed in OpenBSD 2.7.
548:
549: <p>
550: <ul>
1.169 millert 551: <li><a href=errata27.html#readline>Mar 18, 2001:
552: The readline library creates history files with permissive modes based on the user's umask.</a>
553: <li><a href=errata27.html#sudo>Feb 22, 2001:
554: a buffer overflow was fixed in sudo(8).</a>
1.154 millert 555: <li><a href=errata27.html#ftpd>Dec 4, 2000:
556: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.152 deraadt 557: <li><a href=errata27.html#sshforwarding>Nov 10, 2000:
558: Hostile servers can force OpenSSH clients to do agent or X11 forwarding.
559: (patch included)</a>
560: <li><a href=errata27.html#xtrans>Oct 26, 2000:
1.151 matthieu 561: X11 libraries have 2 potential overflows in xtrans code.
562: (patch included)</a>
1.152 deraadt 563: <li><a href=errata27.html#httpd>Oct 18, 2000:
1.150 beck 564: Apache mod_rewrite and mod_vhost_alias modules could expose files
565: on the server in certain configurations if used.
566: (patch included)</a>
1.164 deraadt 567: <li><a href=errata27.html#telnetd>Oct 10, 2000:
1.149 millert 568: The telnet daemon does not strip out the TERMINFO, TERMINFO_DIRS,
569: TERMPATH and TERMCAP environment variables as it should.
570: (patch included)</a>
1.152 deraadt 571: <li><a href=errata27.html#format_strings>Oct 6, 2000:
1.148 millert 572: There are printf-style format string bugs in several privileged
573: programs. (patch included)</a>
1.152 deraadt 574: <li><a href=errata27.html#curses>Oct 6, 2000:
1.147 millert 575: libcurses honored terminal descriptions in the $HOME/.terminfo
576: directory as well as in the TERMCAP environment variable for
577: setuid and setgid applications.
1.146 deraadt 578: (patch included)</a>
1.152 deraadt 579: <li><a href=errata27.html#talkd>Oct 6, 2000:
1.146 deraadt 580: A format string vulnerability exists in talkd(8).
581: (patch included)</a>
1.152 deraadt 582: <li><a href=errata27.html#pw_error>Oct 3, 2000:
1.145 aaron 583: A format string vulnerability exists in the pw_error() function of the
584: libutil library, yielding localhost root through chpass(1).
585: (patch included)</a>
1.152 deraadt 586: <li><a href=errata27.html#ipsec>Sep 18, 2000:
1.144 jason 587: Bad ESP/AH packets could cause a crash under certain conditions.
588: (patch included)</a>
1.152 deraadt 589: <li><a href=errata27.html#xlock>Aug 16, 2000:
1.141 deraadt 590: A format string vulnerability (localhost root) exists in xlock(1).
591: (patch included)</a>
1.152 deraadt 592: <li><a href=errata27.html#X11_libs>July 14, 2000:
1.139 deraadt 593: Various bugs found in X11 libraries have various side effects, almost
594: completely denial of service in OpenBSD.
595: (patch included)</a>
1.152 deraadt 596: <li><a href=errata27.html#ftpd>July 5, 2000:
1.136 deraadt 597: Just like pretty much all the other unix ftp daemons
598: on the planet, ftpd had a remote root hole in it.
599: Luckily, ftpd was not enabled by default.
1.137 deraadt 600: The problem exists if anonymous ftp is enabled.
1.136 deraadt 601: (patch included)</a>
1.152 deraadt 602: <li><a href=errata27.html#mopd>July 5, 2000:
1.136 deraadt 603: Mopd, very rarely used, contained some buffer overflows.
604: (patch included)</a>
1.152 deraadt 605: <li><a href=errata27.html#libedit>June 28, 2000:
1.135 deraadt 606: libedit would check for a <b>.editrc</b> file in the current
607: directory. Not known to be a real security issue, but a patch
608: is available anyways.
609: (patch included)</a>
1.152 deraadt 610: <li><a href=errata27.html#dhclient>June 24, 2000:
1.134 deraadt 611: A serious bug in dhclient(8) could allow strings from a
612: malicious dhcp server to be executed in the shell as root.
613: (patch included)</a>
1.152 deraadt 614: <li><a href=errata27.html#isakmpd>June 9, 2000:
1.133 deraadt 615: A serious bug in isakmpd(8) policy handling wherein
616: policy verification could be completely bypassed in isakmpd.
617: (patch included)</a>
1.152 deraadt 618: <li><a href=errata27.html#uselogin>June 6, 2000:
1.132 deraadt 619: The non-default flag UseLogin in <b>/etc/sshd_config</b> is broken,
620: should not be used, and results in security problems on
621: other operating systems.</a>
1.152 deraadt 622: <li><a href=errata27.html#bridge>May 26, 2000:
1.129 deraadt 623: The bridge(4) <i>learning</i> flag may be bypassed.
1.128 deraadt 624: (patch included)</a>
1.152 deraadt 625: <li><a href=errata27.html#ipf>May 25, 2000:
1.127 kjell 626: Improper use of ipf <i>keep-state</i> rules can result
627: in firewall rules being bypassed. (patch included)</a>
628:
1.124 deraadt 629: </ul>
630:
631: <p>
632: <li>
1.119 deraadt 633: <a name=26></a>
634:
635: <h3><font color=#e00000>OpenBSD 2.6 Security Advisories</font></h3>
636: These are the OpenBSD 2.6 advisories -- all these problems are solved
637: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
638: OpenBSD 2.5 advisories listed below are fixed in OpenBSD 2.6.
639:
640: <p>
641: <ul>
1.130 deraadt 642: <li><a href=errata26.html#semconfig>May 26, 2000:
643: SYSV semaphore support contained an undocumented system call
1.131 deraadt 644: which could wedge semaphore-using processes from exiting. (patch included)</a>
1.127 kjell 645: <li><a href=errata26.html#ipf>May 25, 2000:
646: Improper use of ipf <i>keep-state</i> rules can result
647: in firewall rules being bypassed. (patch included)</a>
1.126 deraadt 648: <li><a href=errata26.html#xlockmore>May 25, 2000:
1.125 deraadt 649: xlockmore has a bug which a localhost attacker can use to gain
650: access to the encrypted root password hash (which is normally
651: encoded using blowfish (see
652: <a href="http://www.openbsd.org/cgi-bin/man.cgi?query=crypt&sektion=3">
653: crypt(3)</a>)
654: (patch included).</a>
1.126 deraadt 655: <li><a href=errata26.html#procfs>Jan 20, 2000:
1.123 deraadt 656: Systems running with procfs enabled and mounted are
657: vulnerable to a very tricky exploit. procfs is not
658: mounted by default.
659: (patch included).</a>
1.190 mpech 660: <li><a href=errata26.html#sendmail>Dec 4, 1999:
661: Sendmail permitted any user to cause a aliases file wrap,
662: thus exposing the system to a race where the aliases file
663: did not exist.
1.119 deraadt 664: (patch included).</a>
1.190 mpech 665: <li><a href=errata26.html#poll>Dec 4, 1999:
666: Various bugs in poll(2) may cause a kernel crash.</a>
1.126 deraadt 667: <li><a href=errata26.html#sslUSA>Dec 2, 1999:
1.120 deraadt 668: A buffer overflow in the RSAREF code included in the
669: USA version of libssl, is possibly exploitable in
670: httpd, ssh, or isakmpd, if SSL/RSA features are enabled.
1.124 deraadt 671: (patch included).<br></a>
672: <strong>Update:</strong> Turns out that this was not exploitable
673: in any of the software included in OpenBSD 2.6.
1.190 mpech 674: <li><a href=errata26.html#ifmedia>Nov 9, 1999:
675: Any user could change interface media configurations, resulting in
676: a localhost denial of service attack.
1.121 deraadt 677: (patch included).</a>
1.119 deraadt 678: </ul>
679:
680: <p>
681: <li>
682:
1.93 deraadt 683: <a name=25></a>
1.106 deraadt 684:
1.110 deraadt 685: <h3><font color=#e00000>OpenBSD 2.5 Security Advisories</font></h3>
1.93 deraadt 686: These are the OpenBSD 2.5 advisories -- all these problems are solved
687: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
688: OpenBSD 2.4 advisories listed below are fixed in OpenBSD 2.5.
689:
1.96 deraadt 690: <p>
1.104 deraadt 691: <ul>
1.117 deraadt 692: <li><a href=errata25.html#cron>Aug 30, 1999:
1.103 deraadt 693: In cron(8), make sure argv[] is NULL terminated in the
694: fake popen() and run sendmail as the user, not as root.
695: (patch included).</a>
1.117 deraadt 696: <li><a href=errata25.html#miscfs>Aug 12, 1999: The procfs and fdescfs
1.101 deraadt 697: filesystems had an overrun in their handling of uio_offset
698: in their readdir() routines. (These filesystems are not
699: enabled by default). (patch included).</a>
1.117 deraadt 700: <li><a href=errata25.html#profil>Aug 9, 1999: Stop profiling (see profil(2))
1.100 deraadt 701: when we execve() a new process. (patch included).</a>
1.117 deraadt 702: <li><a href=errata25.html#ipsec_in_use>Aug 6, 1999: Packets that should have
1.98 deraadt 703: been handled by IPsec may be transmitted as cleartext.
704: PF_KEY SA expirations may leak kernel resources.
705: (patch included).</a>
1.117 deraadt 706: <li><a href=errata25.html#rc>Aug 5, 1999: In /etc/rc, use mktemp(1) for
1.97 deraadt 707: motd re-writing and change the find(1) to use -execdir
708: (patch included).</a>
1.117 deraadt 709: <li><a href=errata25.html#chflags>Jul 30, 1999: Do not permit regular
1.95 deraadt 710: users to chflags(2) or fchflags(2) on character or block devices
711: which they may currently be the owner of (patch included).</a>
1.117 deraadt 712: <li><a href=errata25.html#nroff>Jul 27, 1999: Cause groff(1) to be invoked
1.95 deraadt 713: with the -S flag, when called by nroff(1) (patch included).</a>
1.93 deraadt 714: </ul>
715:
1.106 deraadt 716: <p>
717: <li>
1.75 deraadt 718: <a name=24></a>
1.110 deraadt 719: <h3><font color=#e00000>OpenBSD 2.4 Security Advisories</font></h3>
1.75 deraadt 720: These are the OpenBSD 2.4 advisories -- all these problems are solved
721: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
722: OpenBSD 2.3 advisories listed below are fixed in OpenBSD 2.4.
723:
1.96 deraadt 724: <p>
1.75 deraadt 725: <ul>
1.92 deraadt 726: <li><a href=errata24.html#poll>Mar 22, 1999: The nfds argument for poll(2) needs
1.91 deraadt 727: to be constrained, to avoid kvm starvation (patch included).</a>
1.92 deraadt 728: <li><a href=errata24.html#tss>Mar 21, 1999: A change in TSS handling stops
1.91 deraadt 729: another kernel crash case caused by the <strong>crashme</strong>
730: program (patch included).</a>
1.92 deraadt 731: <li><a href=errata24.html#nlink>Feb 25, 1999: An unbounded increment on the
1.90 deraadt 732: nlink value in FFS and EXT2FS filesystems can cause a system crash.
1.89 deraadt 733: (patch included).</a>
1.92 deraadt 734: <li><a href=errata24.html#ping>Feb 23, 1999: Yet another buffer overflow
1.88 deraadt 735: existed in ping(8). (patch included).</a>
1.92 deraadt 736: <li><a href=errata24.html#ipqrace>Feb 19, 1999: ipintr() had a race in use of
1.87 deraadt 737: the ipq, which could permit an attacker to cause a crash.
738: (patch included).</a>
1.92 deraadt 739: <li><a href=errata24.html#accept>Feb 17, 1999: A race condition in the
1.86 deraadt 740: kernel between accept(2) and select(2) could permit an attacker
741: to hang sockets from remote.
742: (patch included).</a>
1.92 deraadt 743: <li><a href=errata24.html#maxqueue>Feb 17, 1999: IP fragment assembly can
1.85 deraadt 744: bog the machine excessively and cause problems.
745: (patch included).</a>
1.92 deraadt 746: <li><a href=errata24.html#trctrap>Feb 12, 1999: i386 T_TRCTRAP handling and
1.84 deraadt 747: DDB interacted to possibly cause a crash.
748: (patch included).</a>
1.92 deraadt 749: <li><a href=errata24.html#rst>Feb 11, 1999: TCP/IP RST handling was sloppy.
1.83 deraadt 750: (patch included).</a>
1.92 deraadt 751: <li><a href=errata24.html#bootpd>Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 752: problem in bootpd(8). (patch included).</a>
1.92 deraadt 753: <li><a href=errata24.html#termcap>Nov 19, 1998: There is a possibly locally
1.82 deraadt 754: exploitable problem relating to environment variables in termcap
755: and curses. (patch included).</a>
1.92 deraadt 756: <li><a href=errata24.html#tcpfix>Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 757: bug in the TCP decoding kernel. (patch included).</a>
1.75 deraadt 758: </ul>
759:
1.106 deraadt 760: <p>
761: <li>
1.58 deraadt 762: <a name=23></a>
1.110 deraadt 763: <h3><font color=#e00000>OpenBSD 2.3 Security Advisories</font></h3>
1.73 deraadt 764: These are the OpenBSD 2.3 advisories -- all these problems are solved
765: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
766: OpenBSD 2.2 advisories listed below are fixed in OpenBSD 2.3.
1.53 matthieu 767:
1.96 deraadt 768: <p>
1.53 matthieu 769: <ul>
1.81 deraadt 770: <li><a href=errata23.html#bootpd>Nov 27, 1998: There is a remotely exploitable
771: problem in bootpd(8). (patch included).</a>
1.78 deraadt 772: <li><a href=errata23.html#tcpfix>Nov 13, 1998: There is a remote machine lockup
773: bug in the TCP decoding kernel. (patch included).</a>
1.190 mpech 774: <li><a href=errata23.html#resolver>August 31, 1998: A benign looking resolver
775: buffer overflow bug was re-introduced accidentally (patches included).</a>
776: <li><a href=errata23.html#chpass>Aug 2, 1998:
777: chpass(1) has a file descriptor leak which allows an
778: attacker to modify /etc/master.passwd.</a>
779: <li><a href=errata23.html#inetd>July 15, 1998: Inetd had a file descriptor leak.</a>
1.76 aaron 780: <li><a href=errata23.html#fdalloc>Jul 2, 1998: setuid and setgid processes
1.72 deraadt 781: should not be executed with fd slots 0, 1, or 2 free.
782: (patch included).</a>
1.76 aaron 783: <li><a href=errata23.html#xlib>June 6, 1998: Further problems with the X
1.71 deraadt 784: libraries (patches included).</a>
1.76 aaron 785: <li><a href=errata23.html#kill>May 17, 1998: kill(2) of setuid/setgid target
1.66 deraadt 786: processes too permissive (4th revision patch included).</a>
1.76 aaron 787: <li><a href=errata23.html#immutable>May 11, 1998: mmap() permits partial bypassing
1.60 deraadt 788: of immutable and append-only file flags. (patch included).</a>
1.190 mpech 789: <li><a href=errata23.html#ipsec>May 5, 1998: Incorrect handling of IPSEC packets
790: if IPSEC is enabled (patch included).</a>
1.76 aaron 791: <li><a href=errata23.html#xterm-xaw>May 1, 1998: Buffer overflow in xterm and Xaw
1.58 deraadt 792: (CERT advisory VB-98.04) (patch included).</a>
1.53 matthieu 793: </ul>
1.9 deraadt 794:
1.106 deraadt 795: <p>
796: <li>
1.58 deraadt 797: <a name=22></a>
1.110 deraadt 798: <h3><font color=#e00000>OpenBSD 2.2 Security Advisories</font></h3>
1.45 deraadt 799: These are the OpenBSD 2.2 advisories. All these problems are solved
1.55 deraadt 800: in <a href=23.html>OpenBSD 2.3</a>. Some of these problems
1.45 deraadt 801: still exist in other operating systems. (The supplied patches are for
802: OpenBSD 2.2; they may or may not work on OpenBSD 2.1).
1.9 deraadt 803:
1.96 deraadt 804: <p>
1.9 deraadt 805: <ul>
1.72 deraadt 806: <li><a href=errata22.html#ipsec>May 5, 1998: Incorrect handling of IPSEC
807: packets if IPSEC is enabled (patch included).</a>
808: <li><a href=errata22.html#xterm-xaw>May 1, 1998: Buffer overflow in xterm
809: and Xaw (CERT advisory VB-98.04) (patch included).</a>
810: <li><a href=errata22.html#uucpd>Apr 22, 1998: Buffer overflow in uucpd
811: (patch included).</a>
812: <li><a href=errata22.html#rmjob>Apr 22, 1998: Buffer mismanagement in lprm
813: (patch included).</a>
814: <li><a href=errata22.html#ping>Mar 31, 1998: Overflow in ping -R (patch included).</a>
815: <li><a href=errata22.html#named>Mar 30, 1998: Overflow in named fake-iquery
1.59 deraadt 816: (patch included).</a>
1.72 deraadt 817: <li><a href=errata22.html#mountd>Mar 2, 1998: Accidental NFS filesystem
818: export (patch included).</a>
1.112 philen 819: <li><a href="advisories/mmap.txt">Feb 26, 1998: Read-write mmap() flaw.</a>
1.72 deraadt 820: Revision 3 of the patch is available <a href=errata22.html#mmap>here</a>
1.112 philen 821: <li><a href="advisories/sourceroute.txt">Feb 19, 1998: Sourcerouted Packet
1.59 deraadt 822: Acceptance.</a>
1.50 deraadt 823: A patch is available <a href=errata22.html#sourceroute>here</a>.
1.122 rohee 824: <li><a href=errata22.html#ruserok>Feb 13, 1998: Setuid coredump & Ruserok()
1.72 deraadt 825: flaw (patch included).</a>
826: <li><a href=errata22.html#ldso>Feb 9, 1998: MIPS ld.so flaw (patch included).</a>
1.1 deraadt 827: </ul>
828:
1.106 deraadt 829: <p>
830: <li>
1.58 deraadt 831: <a name=21></a>
1.110 deraadt 832: <h3><font color=#e00000>OpenBSD 2.1 Security Advisories</font></h3>
1.52 deraadt 833: These are the OpenBSD 2.1 advisories. All these problems are solved
834: in <a href=22.html>OpenBSD 2.2</a>. Some of these problems still
835: exist in other operating systems. (If you are running OpenBSD 2.1, we
836: would strongly recommend an upgrade to the newest release, as this
837: patch list only attempts at fixing the most important security
838: problems. In particular, OpenBSD 2.2 fixes numerous localhost
839: security problems. Many of those problems were solved in ways which
840: make it hard for us to provide patches).
841:
1.96 deraadt 842: <p>
1.52 deraadt 843: <ul>
1.112 philen 844: <li><a href="advisories/signals.txt">Sep 15, 1997: Deviant Signals (patch included)</a>
845: <li><a href="advisories/rfork.txt">Aug 2, 1997: Rfork() system call flaw
1.59 deraadt 846: (patch included)</a>
1.112 philen 847: <li><a href="advisories/procfs.txt">Jun 24, 1997: Procfs flaws (patch included)</a>
1.52 deraadt 848: </ul>
1.51 deraadt 849:
1.106 deraadt 850: <p>
851: <li>
852: <a name=20></a>
1.110 deraadt 853: <h3><font color=#e00000>OpenBSD 2.0 Security Advisories</font></h3>
1.99 deraadt 854: These are the OpenBSD 2.0 advisories. All these problems are solved
855: in <a href=21.html>OpenBSD 2.1</a>. Some of these problems still
856: exist in other operating systems. (If you are running OpenBSD 2.0, we
857: commend you for being there back in the old days!, but you're really
858: missing out if you don't install a new version!)
859:
860: <p>
861: <ul>
1.112 philen 862: <li><a href="advisories/res_random.txt">April 22, 1997: Predictable IDs in the
1.99 deraadt 863: resolver (patch included)</a>
864: <li>Many others... if people can hunt them down, please let me know
865: and we'll put them up here.
866: </ul>
867:
1.106 deraadt 868: </dl>
1.51 deraadt 869: <p>
1.106 deraadt 870:
871: <a name=watching></a>
1.110 deraadt 872: <li><h3><font color=#e00000>Watching our Changes</font></h3><p>
1.106 deraadt 873:
1.21 deraadt 874: Since we take a proactive stance with security, we are continually
875: finding and fixing new security problems. Not all of these problems
1.80 espie 876: get widely reported because (as stated earlier) many of them are not
1.45 deraadt 877: confirmed to be exploitable; many simple bugs we fix do turn out to
878: have security consequences we could not predict. We do not have the
879: time resources to make these changes available in the above format.<p>
1.21 deraadt 880:
881: Thus there are usually minor security fixes in the current source code
882: beyond the previous major OpenBSD release. We make a limited
1.45 deraadt 883: guarantee that these problems are of minimal impact and unproven
1.44 ian 884: exploitability. If we discover that a problem definitely matters for
1.45 deraadt 885: security, patches will show up here <strong>VERY</strong> quickly.<p>
1.21 deraadt 886:
1.45 deraadt 887: People who are really concerned with security can do a number of
888: things:<p>
1.21 deraadt 889:
890: <ul>
891: <li>If you understand security issues, watch our
1.27 deraadt 892: <a href=mail.html>source-changes mailing list</a> and keep an
1.23 deraadt 893: eye out for things which appear security related. Since
1.21 deraadt 894: exploitability is not proven for many of the fixes we make,
895: do not expect the relevant commit message to say "SECURITY FIX!".
896: If a problem is proven and serious, a patch will be available
897: here very shortly after.
1.161 horacio 898: <li>In addition to source changes, you can watch our <a href="mail.html">
1.160 ericj 899: security-announce mailing list</a> which will notify you for every
1.186 ian 900: security related item that the OpenBSD team deems as a possible threat,
1.160 ericj 901: and instruct you on how to patch the problem.
1.21 deraadt 902: <li>Track our current source code tree, and teach yourself how to do a
1.29 deraadt 903: complete system build from time to time (read /usr/src/Makefile
904: carefully). Users can make the assumption that the current
905: source tree always has stronger security than the previous release.
1.45 deraadt 906: However, building your own system from source code is not trivial;
907: it is nearly 300MB of source code, and problems do occur as we
908: transition between major releases.
1.115 ericj 909: <li>Install a binary snapshot for your
1.80 espie 910: architecture, which are made available fairly often. For
1.29 deraadt 911: instance, an i386 snapshot is typically made available weekly.
1.21 deraadt 912: </ul>
913:
1.9 deraadt 914: <p>
1.153 jufi 915: <a name=reporting></a>
1.110 deraadt 916: <li><h3><font color=#e00000>Reporting problems</font></h3><p>
1.3 deraadt 917:
1.5 deraadt 918: <p> If you find a new security problem, you can mail it to
1.6 deraadt 919: <a href=mailto:deraadt@openbsd.org>deraadt@openbsd.org</a>.
1.7 deraadt 920: <br>
1.5 deraadt 921: If you wish to PGP encode it (but please only do so if privacy is very
1.112 philen 922: urgent, since it is inconvenient) use this <a href="advisories/pgpkey.txt">pgp key</a>.
1.5 deraadt 923:
1.107 deraadt 924: <p>
925: <a name=papers></a>
1.110 deraadt 926: <li><h3><font color=#e00000>Further Reading</font></h3><p>
1.107 deraadt 927:
928: A number of papers have been written by OpenBSD team members, about security
929: related changes they have done in OpenBSD. The postscript versions of these
1.108 deraadt 930: documents are available as follows.<p>
1.107 deraadt 931:
932: <ul>
1.113 deraadt 933: <li>A Future-Adaptable Password Scheme.<br>
1.118 deraadt 934: <a href=events.html#usenix99>Usenix 1999</a>,
1.153 jufi 935: by <a href=mailto:provos@openbsd.org>Niels Provos</a>,
1.113 deraadt 936: <a href=mailto:dm@openbsd.org>David Mazieres</a>.<br>
1.107 deraadt 937: <a href=papers/bcrypt-paper.ps>paper</a> and
938: <a href=papers/bcrypt-slides.ps>slides</a>.
1.113 deraadt 939: <p>
940: <li>Cryptography in OpenBSD: An Overview.<br>
1.118 deraadt 941: <a href=events.html#usenix99>Usenix 1999</a>,
1.113 deraadt 942: by <a href=mailto:deraadt@openbsd.org>Theo de Raadt</a>,
943: <a href=mailto:niklas@openbsd.org>Niklas Hallqvist</a>,
944: <a href=mailto:art@openbsd.org>Artur Grabowski</a>,
945: <a href=mailto:angelos@openbsd.org>Angelos D. Keromytis</a>,
946: <a href=mailto:provos@openbsd.org>Niels Provos</a>.<br>
1.107 deraadt 947: <a href=papers/crypt-paper.ps>paper</a> and
948: <a href=papers/crypt-slides.ps>slides</a>.
1.113 deraadt 949: <p>
950: <li>strlcpy and strlcat -- consistent, safe, string copy and concatenation.<br>
1.118 deraadt 951: <a href=events.html#usenix99>Usenix 1999</a>,
1.113 deraadt 952: by <a href=mailto:millert@openbsd.org>Todd C. Miller</a>,
953: <a href=mailto:deraadt@openbsd.org>Theo de Raadt</a>.<br>
1.109 deraadt 954: <a href=papers/strlcpy-paper.ps>paper</a> and
955: <a href=papers/strlcpy-slides.ps>slides</a>.
1.113 deraadt 956: <p>
1.118 deraadt 957: <li>Dealing with Public Ethernet Jacks-Switches, Gateways, and Authentication.<br>
958: <a href=events.html#lisa99>LISA 1999</a>,
959: by <a href=mailto:beck@openbsd.org>Bob Beck</a>.<br>
960: <a href=papers/authgw-paper.ps>paper</a> and
961: <a href=papers/authgw-slides.ps>slides</a>.
962: <p>
1.153 jufi 963: <li>Encrypting Virtual Memory<br>
1.142 deraadt 964: <a href=events.html#sec2000>Usenix Security 2000</a>,
965: <a href=mailto:provos@openbsd.org>Niels Provos</a>.<br>
1.143 provos 966: <a href=papers/swapencrypt.ps>paper</a> and
967: <a href=papers/swapencrypt-slides.ps>slides</a>.
1.142 deraadt 968: <p>
1.107 deraadt 969: </ul>
970:
1.106 deraadt 971: </dl>
972:
1.2 deraadt 973: <hr>
1.68 pauls 974: <a href=index.html><img height=24 width=24 src=back.gif border=0 alt=OpenBSD></a>
1.24 deraadt 975: <a href=mailto:www@openbsd.org>www@openbsd.org</a>
976: <br>
1.230 ! millert 977: <small>$OpenBSD: security.html,v 1.229 2002/11/06 23:37:17 miod Exp $</small>
1.1 deraadt 978:
1.24 deraadt 979: </body>
980: </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