Annotation of www/security.html, Revision 1.74
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1.20 deraadt 4: <title>OpenBSD Security</title>
1.1 deraadt 5: <link rev=made href=mailto:www@openbsd.org>
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7: <meta name="description" content="OpenBSD advisories">
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14:
1.68 pauls 15: <img alt="[OpenBSD]" height=30 width=141 SRC="/images/smalltitle.gif">
1.1 deraadt 16:
1.56 deraadt 17: <hr>
18: <a href=#21>For 2.1 security advisories, please refer here</a>.<br>
19: <a href=#22>For 2.2 security advisories, please refer here</a>.<br>
20: <a href=#23>For 2.3 security advisories, please refer here</a>.<br>
21: <hr>
22:
1.2 deraadt 23: <p>
1.12 deraadt 24: <h3><font color=#e00000><strong>OpenBSD Security Views</strong></font></h3>
1.22 deraadt 25:
1.14 deraadt 26: OpenBSD believes in strong security. Our aspiration is to be NUMBER
1.22 deraadt 27: ONE in the industry for security (if we are not already there). Our
28: open software development model permits us to take a more
29: uncompromising view towards increased security than Sun, SGI, IBM, HP,
30: or other vendors are able to. We can make changes the vendors would
1.27 deraadt 31: not make. Also, since OpenBSD is exported with <a href=crypto.html>
1.45 deraadt 32: cryptography</a>, we are able to take cryptographic approaches towards
33: fixing security problems.<p>
1.18 deraadt 34:
1.45 deraadt 35: Like many readers of the
1.13 deraadt 36: <a href=http://www.geek-girl.com/bugtraq/index.html>
1.18 deraadt 37: BUGTRAQ mailing list</a>,
1.45 deraadt 38: we believe in full disclosure of security problems. Security
39: information moves very fast in cracker circles. On the other hand,
40: our experience is that coding and releasing of proper security fixes
41: typically requires about an hour of work -- very fast fix turnaround
42: is possible. Thus we think that full disclosure helps the people who
1.22 deraadt 43: really care about security.<p>
1.15 deraadt 44:
1.12 deraadt 45: Our security auditing team typically has between six and twelve
1.45 deraadt 46: members who continue to search for and fix new security holes. We
47: have been auditing since the summer of 1996. The process we follow to
48: increase security is simply a comprehensive file-by-file analysis of
49: every critical software component. Flaws have been found in just
50: about every area of the system. Entire new classes of security
51: problems have been found during our the audit, and often source code
52: which had been audited earlier needs re-auditing with these new flaws
53: in mind. Code often gets audited multiple times, and by multiple
54: people with different auditing skills.<p>
1.12 deraadt 55:
1.31 deraadt 56: Some members of our security auditing team work for
57: <a href=http://www.secnet.com>Secure Networks</a>, the company that
1.32 deraadt 58: makes the industry's premier network security scanning software
59: package Ballista.
1.31 deraadt 60: This company does a lot of security research, and this fits in well
1.45 deraadt 61: with the OpenBSD stance. OpenBSD passes Ballista's tests with flying
62: colours.<p>
1.31 deraadt 63:
1.34 deraadt 64: Another facet of our security auditing process is its proactiveness.
1.45 deraadt 65: In most cases we have found that the determination of exploitability
66: is not an issue. During our ongoing auditing process we find many
67: bugs, and endeavor to fix them even though exploitability is not
68: proven. We fix the bug, and we move on to find other bugs to fix. We
69: have fixed many simple and obvious careless programming errors in code
70: and only months later discovered that the problems were in fact
71: exploitable. (Or, more likely someone on
72: <a href=http://www.geek-girl.com/bugtraq/index.html>BUGTRAQ</a>
73: would report that other operating systems were vulnerable to a `newly
74: discovered problem', and then it would be discovered that OpenBSD had
75: been fixed in a previous release). In other cases we have been saved
76: from full exploitability of complex step-by-step attacks because we
77: had fixed one of the intermediate steps. An example of where we
78: managed such a success is the
1.30 deraadt 79: <a href=http://www.secnet.com/sni-advisories/sni-19.bsd.lpd.advisory.html>
1.35 deraadt 80: lpd advisory from Secure Networks.</a><p>
1.29 deraadt 81:
1.45 deraadt 82: Our proactive auditing process has really paid off. Statements like
1.35 deraadt 83: ``This problem was fixed in OpenBSD about 6 months ago'' have become
1.45 deraadt 84: commonplace in security forums like
85: <a href=http://www.geek-girl.com/bugtraq/index.html>BUGTRAQ</a>.<p>
1.35 deraadt 86:
1.45 deraadt 87: The most intense part of our security auditing happened immediately
88: before the OpenBSD 2.0 release and during the 2.0->2.1 transition,
89: over the last third of 1996 and first half of 1997. Thousands (yes,
90: thousands) of security issues were fixed rapidly over this year-long
91: period; bugs like the standard buffer overflows, protocol
92: implementation weaknesses, information gathering, and filesystem
93: races. Hence most of the security problems that we encountered were
94: fixed before our 2.1 release, and then a far smaller number needed
95: fixing for our 2.2 release. We do not find as many problems anymore,
96: it is simply a case of diminishing returns. Recently the security
97: problems we find and fix tend to be significantly more obscure or
98: complicated. Still we will persist for a number of reasons:<p>
1.36 deraadt 99:
1.35 deraadt 100: <ul>
1.45 deraadt 101: <li>Occasionally we find a simple problem we missed earlier. Doh!
1.35 deraadt 102: <li>Security is like an arms race; the best attackers will continue
1.45 deraadt 103: to search for more complicated exploits, so we will too.
104: <li>Finding and fixing subtle flaws in complicated software is
105: a lot of fun.
1.35 deraadt 106: </ul>
1.15 deraadt 107:
1.14 deraadt 108: The auditing process is not over yet, and as you can see we continue
1.28 deraadt 109: to find and fix new security flaws.<p>
1.12 deraadt 110:
1.58 deraadt 111: <a name=23></a>
1.12 deraadt 112: <p>
1.52 deraadt 113: <h3><font color=#e00000><strong>OpenBSD 2.3 Security Advisories</strong></font></h3>
1.73 deraadt 114: These are the OpenBSD 2.3 advisories -- all these problems are solved
115: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
116: OpenBSD 2.2 advisories listed below are fixed in OpenBSD 2.3.
1.53 matthieu 117:
118: <ul>
1.74 ! millert 119: <li><a href=errata.html#chpass>Aug 1, 1998: chpass(1) has a file descriptor
! 120: leak which creates a race condition that allows an attacker to
! 121: modify /etc/master.passwd (patch included).</a>
1.72 deraadt 122: <li><a href=errata.html#fdalloc>Jul 2, 1998: setuid and setgid processes
123: should not be executed with fd slots 0, 1, or 2 free.
124: (patch included).</a>
125: <li><a href=errata.html#xlib>June 6, 1998: Further problems with the X
1.71 deraadt 126: libraries (patches included).</a>
1.72 deraadt 127: <li><a href=errata.html#pctr>June 4, 1998: on non-Intel i386 machines, any user
128: can use pctr(4) to crash the machine.</a>
1.66 deraadt 129: <li><a href=errata.html#kill>May 17, 1998: kill(2) of setuid/setgid target
130: processes too permissive (4th revision patch included).</a>
1.60 deraadt 131: <li><a href=errata.html#immutable>May 11, 1998: mmap() permits partial bypassing
132: of immutable and append-only file flags. (patch included).</a>
1.59 deraadt 133: <li><a href=errata.html#xterm-xaw>May 1, 1998: Buffer overflow in xterm and Xaw
1.58 deraadt 134: (CERT advisory VB-98.04) (patch included).</a>
1.59 deraadt 135: <li><a href=errata.html#ipsec>May 5, 1998: Incorrect handling of IPSEC packets
136: if IPSEC is enabled (patch included).</a>
1.53 matthieu 137: </ul>
1.9 deraadt 138:
1.58 deraadt 139: <a name=22></a>
1.9 deraadt 140: <p>
1.12 deraadt 141: <h3><font color=#e00000><strong>OpenBSD 2.2 Security Advisories</strong></font></h3>
1.45 deraadt 142: These are the OpenBSD 2.2 advisories. All these problems are solved
1.55 deraadt 143: in <a href=23.html>OpenBSD 2.3</a>. Some of these problems
1.45 deraadt 144: still exist in other operating systems. (The supplied patches are for
145: OpenBSD 2.2; they may or may not work on OpenBSD 2.1).
1.9 deraadt 146:
147: <ul>
1.72 deraadt 148: <li><a href=errata22.html#ipsec>May 5, 1998: Incorrect handling of IPSEC
149: packets if IPSEC is enabled (patch included).</a>
150: <li><a href=errata22.html#xterm-xaw>May 1, 1998: Buffer overflow in xterm
151: and Xaw (CERT advisory VB-98.04) (patch included).</a>
152: <li><a href=errata22.html#uucpd>Apr 22, 1998: Buffer overflow in uucpd
153: (patch included).</a>
154: <li><a href=errata22.html#rmjob>Apr 22, 1998: Buffer mismanagement in lprm
155: (patch included).</a>
156: <li><a href=errata22.html#ping>Mar 31, 1998: Overflow in ping -R (patch included).</a>
157: <li><a href=errata22.html#named>Mar 30, 1998: Overflow in named fake-iquery
1.59 deraadt 158: (patch included).</a>
1.72 deraadt 159: <li><a href=errata22.html#mountd>Mar 2, 1998: Accidental NFS filesystem
160: export (patch included).</a>
161: <li><a href=advisories/mmap>Feb 26, 1998: Read-write mmap() flaw.</a>
162: Revision 3 of the patch is available <a href=errata22.html#mmap>here</a>
1.59 deraadt 163: <li><a href=advisories/sourceroute>Feb 19, 1998: Sourcerouted Packet
164: Acceptance.</a>
1.50 deraadt 165: A patch is available <a href=errata22.html#sourceroute>here</a>.
1.72 deraadt 166: <li><a href=errata22.html#ruserok>Feb 13, 1998: Setuid coredump & Ruserok()
167: flaw (patch included).</a>
168: <li><a href=errata22.html#ldso>Feb 9, 1998: MIPS ld.so flaw (patch included).</a>
169: <li><a href=errata22.html#f00f>Dec 10, 1997: Intel P5 f00f lockup
1.59 deraadt 170: (patch included).</a>
1.1 deraadt 171: </ul>
172:
1.58 deraadt 173: <a name=21></a>
1.21 deraadt 174: <p>
1.52 deraadt 175: <h3><font color=#e00000><strong>OpenBSD 2.1 Security Advisories</strong></font></h3>
176: These are the OpenBSD 2.1 advisories. All these problems are solved
177: in <a href=22.html>OpenBSD 2.2</a>. Some of these problems still
178: exist in other operating systems. (If you are running OpenBSD 2.1, we
179: would strongly recommend an upgrade to the newest release, as this
180: patch list only attempts at fixing the most important security
181: problems. In particular, OpenBSD 2.2 fixes numerous localhost
182: security problems. Many of those problems were solved in ways which
183: make it hard for us to provide patches).
184:
185: <ul>
1.72 deraadt 186: <li><a href=advisories/signals>Sep 15, 1997: Deviant Signals (patch included)</a>
1.59 deraadt 187: <li><a href=advisories/rfork>Aug 2, 1997: Rfork() system call flaw
188: (patch included)</a>
189: <li><a href=advisories/procfs>Jun 24, 1997: Procfs flaws (patch included)</a>
1.52 deraadt 190: </ul>
1.51 deraadt 191:
192: <p>
1.21 deraadt 193: <h3><font color=#e00000><strong>Watching our Security Changes</strong></font></h3>
194: Since we take a proactive stance with security, we are continually
195: finding and fixing new security problems. Not all of these problems
1.45 deraadt 196: get widely reported because (as stated earlier); many of them are not
197: confirmed to be exploitable; many simple bugs we fix do turn out to
198: have security consequences we could not predict. We do not have the
199: time resources to make these changes available in the above format.<p>
1.21 deraadt 200:
201: Thus there are usually minor security fixes in the current source code
202: beyond the previous major OpenBSD release. We make a limited
1.45 deraadt 203: guarantee that these problems are of minimal impact and unproven
1.44 ian 204: exploitability. If we discover that a problem definitely matters for
1.45 deraadt 205: security, patches will show up here <strong>VERY</strong> quickly.<p>
1.21 deraadt 206:
1.45 deraadt 207: People who are really concerned with security can do a number of
208: things:<p>
1.21 deraadt 209:
210: <ul>
211: <li>If you understand security issues, watch our
1.27 deraadt 212: <a href=mail.html>source-changes mailing list</a> and keep an
1.23 deraadt 213: eye out for things which appear security related. Since
1.21 deraadt 214: exploitability is not proven for many of the fixes we make,
215: do not expect the relevant commit message to say "SECURITY FIX!".
216: If a problem is proven and serious, a patch will be available
217: here very shortly after.
218: <li>Track our current source code tree, and teach yourself how to do a
1.29 deraadt 219: complete system build from time to time (read /usr/src/Makefile
220: carefully). Users can make the assumption that the current
221: source tree always has stronger security than the previous release.
1.45 deraadt 222: However, building your own system from source code is not trivial;
223: it is nearly 300MB of source code, and problems do occur as we
224: transition between major releases.
1.29 deraadt 225: <li>Install a binary <a href=snapshots.html>snapshot</a> for your
226: architecure, which are made available fairly often. For
227: instance, an i386 snapshot is typically made available weekly.
1.21 deraadt 228: </ul>
229:
1.9 deraadt 230: <p>
1.12 deraadt 231: <h3><font color=#e00000><strong>Other Resources</strong></font></h3>
1.3 deraadt 232: Other security advisories that have (in the past) affected OpenBSD can
1.4 deraadt 233: be found at the <a href=http://www.secnet.com/nav1.html>Secure Networks archive</a>.
1.25 deraadt 234: Some OpenBSD audit team members worked with Secure Networks on discovering
235: and solving the problems detailed in some of their security advisories.
1.3 deraadt 236:
1.5 deraadt 237: <p> If you find a new security problem, you can mail it to
1.6 deraadt 238: <a href=mailto:deraadt@openbsd.org>deraadt@openbsd.org</a>.
1.7 deraadt 239: <br>
1.5 deraadt 240: If you wish to PGP encode it (but please only do so if privacy is very
1.27 deraadt 241: urgent, since it is inconvenient) use this <a href=advisories/pgpkey>pgp key</a>.
1.5 deraadt 242:
1.2 deraadt 243: <hr>
1.68 pauls 244: <a href=index.html><img height=24 width=24 src=back.gif border=0 alt=OpenBSD></a>
1.24 deraadt 245: <a href=mailto:www@openbsd.org>www@openbsd.org</a>
246: <br>
1.74 ! millert 247: <small>$OpenBSD: security.html,v 1.73 1998/07/07 02:27:16 deraadt Exp $</small>
1.1 deraadt 248:
1.24 deraadt 249: </body>
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