Annotation of www/security.html, Revision 1.171
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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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1.77 deraadt 14: <img alt="[OpenBSD]" height=30 width=141 SRC="images/smalltitle.gif">
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">
1.152 deraadt 38: <a href="#28">For 2.8 security advisories</a>.<br>
1.124 deraadt 39: <a href="#27">For 2.7 security advisories</a>.<br>
1.119 deraadt 40: <a href="#26">For 2.6 security advisories</a>.<br>
1.114 philen 41: <a href="#25">For 2.5 security advisories</a>.<br>
42: <a href="#24">For 2.4 security advisories</a>.<br>
43: <a href="#23">For 2.3 security advisories</a>.<br>
44: <a href="#22">For 2.2 security advisories</a>.<br>
45: <a href="#21">For 2.1 security advisories</a>.<br>
46: <a href="#20">For 2.0 security advisories</a>.<br>
47: </td>
48: </tr>
49: </table>
1.56 deraadt 50: <hr>
51:
1.106 deraadt 52: <dl>
53: <a name=goals></a>
1.110 deraadt 54: <li><h3><font color=#e00000>Goal</font></h3><p>
1.22 deraadt 55:
1.14 deraadt 56: OpenBSD believes in strong security. Our aspiration is to be NUMBER
1.22 deraadt 57: ONE in the industry for security (if we are not already there). Our
58: open software development model permits us to take a more
59: uncompromising view towards increased security than Sun, SGI, IBM, HP,
60: or other vendors are able to. We can make changes the vendors would
1.27 deraadt 61: not make. Also, since OpenBSD is exported with <a href=crypto.html>
1.45 deraadt 62: cryptography</a>, we are able to take cryptographic approaches towards
63: fixing security problems.<p>
1.18 deraadt 64:
1.106 deraadt 65: <a name=disclosure></a>
1.110 deraadt 66: <li><h3><font color=#e00000>Full Disclosure</font></h3><p>
1.106 deraadt 67:
1.45 deraadt 68: Like many readers of the
1.102 deraadt 69: <a href=http://www.securityfocus.com/bugtraq/archive>
1.18 deraadt 70: BUGTRAQ mailing list</a>,
1.106 deraadt 71: we believe in full disclosure of security problems. In the
72: operating system arena, we were probably the first to embrace
73: the concept. Many vendors, even of free software, still try
74: to hide issues from their users.<p>
75:
76: Security information moves very fast in cracker circles. On the other
77: hand, our experience is that coding and releasing of proper security
78: fixes typically requires about an hour of work -- very fast fix
79: turnaround is possible. Thus we think that full disclosure helps the
80: people who really care about security.<p>
81:
1.153 jufi 82: <a name=process></a>
1.110 deraadt 83: <li><h3><font color=#e00000>Audit Process</font></h3><p>
1.15 deraadt 84:
1.12 deraadt 85: Our security auditing team typically has between six and twelve
1.45 deraadt 86: members who continue to search for and fix new security holes. We
87: have been auditing since the summer of 1996. The process we follow to
88: increase security is simply a comprehensive file-by-file analysis of
1.106 deraadt 89: every critical software component. We are not so much looking for
90: security holes, as we are looking for basic software bugs, and if
1.138 deraadt 91: years later someone discovers the problem used to be a security
1.106 deraadt 92: issue, and we fixed it because it was just a bug, well, all the
93: better. Flaws have been found in just about every area of the system.
94: Entire new classes of security problems have been found during our
95: audit, and often source code which had been audited earlier needs
96: re-auditing with these new flaws in mind. Code often gets audited
97: multiple times, and by multiple people with different auditing
98: skills.<p>
1.12 deraadt 99:
1.94 deraadt 100: Some members of our security auditing team worked for Secure Networks,
101: the company that made the industry's premier network security scanning
102: software package Ballista (Secure Networks got purchased by Network
103: Associates, Ballista got renamed to Cybercop Scanner, and well...)
104: That company did a lot of security research, and thus fit in well
1.106 deraadt 105: with the OpenBSD stance. OpenBSD passed Ballista's tests with flying
106: colours since day 1.<p>
1.31 deraadt 107:
1.34 deraadt 108: Another facet of our security auditing process is its proactiveness.
1.45 deraadt 109: In most cases we have found that the determination of exploitability
110: is not an issue. During our ongoing auditing process we find many
111: bugs, and endeavor to fix them even though exploitability is not
112: proven. We fix the bug, and we move on to find other bugs to fix. We
113: have fixed many simple and obvious careless programming errors in code
114: and only months later discovered that the problems were in fact
115: exploitable. (Or, more likely someone on
1.102 deraadt 116: <a href=http://www.securityfocus.com/bugtraq/archive>BUGTRAQ</a>
1.45 deraadt 117: would report that other operating systems were vulnerable to a `newly
118: discovered problem', and then it would be discovered that OpenBSD had
119: been fixed in a previous release). In other cases we have been saved
120: from full exploitability of complex step-by-step attacks because we
121: had fixed one of the intermediate steps. An example of where we
1.94 deraadt 122: managed such a success is the lpd advisory that Secure Networks put out.
123: <p>
1.29 deraadt 124:
1.110 deraadt 125: <li><h3><font color=#e00000>The Reward</font></h3><p>
1.106 deraadt 126:
1.45 deraadt 127: Our proactive auditing process has really paid off. Statements like
1.35 deraadt 128: ``This problem was fixed in OpenBSD about 6 months ago'' have become
1.45 deraadt 129: commonplace in security forums like
1.102 deraadt 130: <a href=http://www.securityfocus.com/bugtraq/archive>BUGTRAQ</a>.<p>
1.35 deraadt 131:
1.45 deraadt 132: The most intense part of our security auditing happened immediately
1.80 espie 133: before the OpenBSD 2.0 release and during the 2.0->2.1 transition,
1.45 deraadt 134: over the last third of 1996 and first half of 1997. Thousands (yes,
135: thousands) of security issues were fixed rapidly over this year-long
136: period; bugs like the standard buffer overflows, protocol
137: implementation weaknesses, information gathering, and filesystem
138: races. Hence most of the security problems that we encountered were
139: fixed before our 2.1 release, and then a far smaller number needed
140: fixing for our 2.2 release. We do not find as many problems anymore,
141: it is simply a case of diminishing returns. Recently the security
142: problems we find and fix tend to be significantly more obscure or
143: complicated. Still we will persist for a number of reasons:<p>
1.36 deraadt 144:
1.35 deraadt 145: <ul>
1.45 deraadt 146: <li>Occasionally we find a simple problem we missed earlier. Doh!
1.35 deraadt 147: <li>Security is like an arms race; the best attackers will continue
1.45 deraadt 148: to search for more complicated exploits, so we will too.
149: <li>Finding and fixing subtle flaws in complicated software is
150: a lot of fun.
1.35 deraadt 151: </ul>
1.106 deraadt 152: <p>
1.15 deraadt 153:
1.14 deraadt 154: The auditing process is not over yet, and as you can see we continue
1.28 deraadt 155: to find and fix new security flaws.<p>
1.12 deraadt 156:
1.106 deraadt 157: <a name=default></a>
1.110 deraadt 158: <li><h3><font color=#e00000>"Secure by Default"</font></h3><p>
1.106 deraadt 159:
160: To ensure that novice users of OpenBSD do not need to become security
161: experts overnight (a viewpoint which other vendors seem to have), we
162: ship the operating system in a Secure by Default mode. All non-essential
163: services are disabled. As the user/administrator becomes more familiar
164: with the system, he will discover that he has to enable daemons and other
165: parts of the system. During the process of learning how to enable a new
166: service, the novice is more likely to learn of security considerations.<p>
167:
168: This is in stark contrast to the increasing number of systems that
169: ship with NFS, mountd, web servers, and various other services enabled
170: by default, creating instantaneous security problems for their users
171: within minutes after their first install.<p>
172:
1.153 jufi 173: <a name=crypto></a>
1.110 deraadt 174: <li><h3><font color=#e00000>Cryptography</font></h3><p>
1.106 deraadt 175:
176: And of course, since the OpenBSD project is based in Canada, it is possible
177: for us to integrate cryptography. For more information, read the page
1.116 deraadt 178: outlining <a href=crypto.html>what we have done with cryptography</a>.</p>
1.106 deraadt 179:
1.110 deraadt 180: <li><h3><font color=#e00000>Advisories</font></h3><p>
1.106 deraadt 181:
182: <dl>
183:
184: <li>
1.152 deraadt 185: <a name=28></a>
186:
187: <h3><font color=#e00000>OpenBSD 2.8 Security Advisories</font></h3>
188: These are the OpenBSD 2.8 advisories -- all these problems are solved
1.154 millert 189: in <a href=anoncvs.html>OpenBSD current</a> and the
190: <a href=anoncvs.html#using>patch branch</a>.
1.152 deraadt 191:
192: <p>
193: <ul>
1.170 ericj 194: <li><a href=errata.html#glob>Apr 10, 2001:
195: The glob(3) library call contains multiple buffer overflows.</a>
1.169 millert 196: <li><a href=errata.html#readline>Mar 18, 2001:
197: The readline library creates history files with permissive modes based on the user's umask.</a>
1.167 ericj 198: <li><a href=errata.html#ipsec_ah>Mar 2, 2001:
199: Insufficient checks in the IPSEC AH IPv4 option handling code can lead to a buffer overrun in the kernel.</a>
200: <li><a href=errata.html#userldt>Mar 2, 2001:
1.168 horacio 201: The <b>USER_LDT</b> kernel option allows an attacker to gain access to privileged areas of kernel memory.</a>
1.165 millert 202: <li><a href=errata.html#sudo>Feb 22, 2001:
1.171 ! millert 203: a non-exploitable buffer overflow was fixed in sudo(8).</a>
1.163 jason 204: <li><a href=errata.html#named>Jan 29, 2001:
205: merge named(8) with ISC BIND 4.9.8-REL, which fixes some buffer vulnerabilities.</a>
1.162 jason 206: <li><a href=errata.html#rnd>Jan 22, 2001:
207: rnd(4) did not use all of its input when written to.</a>
1.159 ericj 208: <li><a href=errata.html#xlock>Dec 22, 2000:
209: xlock(1)'s authentication was re-done to authenticate via a named pipe. (patch and new xlock binaries included).</a>
1.157 ericj 210: <li><a href=errata.html#procfs>Dec 18, 2000:
211: Procfs contains numerous overflows. Procfs is not used by default in OpenBSD. (patch included).</a>
1.156 deraadt 212: <li><a href=errata.html#kerberos2>Dec 10, 2000:
213: Another problem exists in KerberosIV libraries (patch included).</a>
1.155 deraadt 214: <li><a href=errata.html#kerberos>Dec 7, 2000:
215: A set of problems in KerberosIV exist (patch included).</a>
1.154 millert 216: <li><a href=errata.html#ftpd>Dec 4, 2000:
217: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.152 deraadt 218: </ul>
219:
220: <p>
221: <li>
1.124 deraadt 222: <a name=27></a>
223:
224: <h3><font color=#e00000>OpenBSD 2.7 Security Advisories</font></h3>
225: These are the OpenBSD 2.7 advisories -- all these problems are solved
226: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
227: OpenBSD 2.6 advisories listed below are fixed in OpenBSD 2.7.
228:
229: <p>
230: <ul>
1.169 millert 231: <li><a href=errata27.html#readline>Mar 18, 2001:
232: The readline library creates history files with permissive modes based on the user's umask.</a>
233: <li><a href=errata27.html#sudo>Feb 22, 2001:
234: a buffer overflow was fixed in sudo(8).</a>
1.154 millert 235: <li><a href=errata27.html#ftpd>Dec 4, 2000:
236: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.152 deraadt 237: <li><a href=errata27.html#sshforwarding>Nov 10, 2000:
238: Hostile servers can force OpenSSH clients to do agent or X11 forwarding.
239: (patch included)</a>
240: <li><a href=errata27.html#xtrans>Oct 26, 2000:
1.151 matthieu 241: X11 libraries have 2 potential overflows in xtrans code.
242: (patch included)</a>
1.152 deraadt 243: <li><a href=errata27.html#httpd>Oct 18, 2000:
1.150 beck 244: Apache mod_rewrite and mod_vhost_alias modules could expose files
245: on the server in certain configurations if used.
246: (patch included)</a>
1.164 deraadt 247: <li><a href=errata27.html#telnetd>Oct 10, 2000:
1.149 millert 248: The telnet daemon does not strip out the TERMINFO, TERMINFO_DIRS,
249: TERMPATH and TERMCAP environment variables as it should.
250: (patch included)</a>
1.152 deraadt 251: <li><a href=errata27.html#format_strings>Oct 6, 2000:
1.148 millert 252: There are printf-style format string bugs in several privileged
253: programs. (patch included)</a>
1.152 deraadt 254: <li><a href=errata27.html#curses>Oct 6, 2000:
1.147 millert 255: libcurses honored terminal descriptions in the $HOME/.terminfo
256: directory as well as in the TERMCAP environment variable for
257: setuid and setgid applications.
1.146 deraadt 258: (patch included)</a>
1.152 deraadt 259: <li><a href=errata27.html#talkd>Oct 6, 2000:
1.146 deraadt 260: A format string vulnerability exists in talkd(8).
261: (patch included)</a>
1.152 deraadt 262: <li><a href=errata27.html#pw_error>Oct 3, 2000:
1.145 aaron 263: A format string vulnerability exists in the pw_error() function of the
264: libutil library, yielding localhost root through chpass(1).
265: (patch included)</a>
1.152 deraadt 266: <li><a href=errata27.html#ipsec>Sep 18, 2000:
1.144 jason 267: Bad ESP/AH packets could cause a crash under certain conditions.
268: (patch included)</a>
1.152 deraadt 269: <li><a href=errata27.html#xlock>Aug 16, 2000:
1.141 deraadt 270: A format string vulnerability (localhost root) exists in xlock(1).
271: (patch included)</a>
1.152 deraadt 272: <li><a href=errata27.html#X11_libs>July 14, 2000:
1.139 deraadt 273: Various bugs found in X11 libraries have various side effects, almost
274: completely denial of service in OpenBSD.
275: (patch included)</a>
1.152 deraadt 276: <li><a href=errata27.html#ftpd>July 5, 2000:
1.136 deraadt 277: Just like pretty much all the other unix ftp daemons
278: on the planet, ftpd had a remote root hole in it.
279: Luckily, ftpd was not enabled by default.
1.137 deraadt 280: The problem exists if anonymous ftp is enabled.
1.136 deraadt 281: (patch included)</a>
1.152 deraadt 282: <li><a href=errata27.html#mopd>July 5, 2000:
1.136 deraadt 283: Mopd, very rarely used, contained some buffer overflows.
284: (patch included)</a>
1.152 deraadt 285: <li><a href=errata27.html#libedit>June 28, 2000:
1.135 deraadt 286: libedit would check for a <b>.editrc</b> file in the current
287: directory. Not known to be a real security issue, but a patch
288: is available anyways.
289: (patch included)</a>
1.152 deraadt 290: <li><a href=errata27.html#dhclient>June 24, 2000:
1.134 deraadt 291: A serious bug in dhclient(8) could allow strings from a
292: malicious dhcp server to be executed in the shell as root.
293: (patch included)</a>
1.152 deraadt 294: <li><a href=errata27.html#isakmpd>June 9, 2000:
1.133 deraadt 295: A serious bug in isakmpd(8) policy handling wherein
296: policy verification could be completely bypassed in isakmpd.
297: (patch included)</a>
1.152 deraadt 298: <li><a href=errata27.html#uselogin>June 6, 2000:
1.132 deraadt 299: The non-default flag UseLogin in <b>/etc/sshd_config</b> is broken,
300: should not be used, and results in security problems on
301: other operating systems.</a>
1.152 deraadt 302: <li><a href=errata27.html#bridge>May 26, 2000:
1.129 deraadt 303: The bridge(4) <i>learning</i> flag may be bypassed.
1.128 deraadt 304: (patch included)</a>
1.152 deraadt 305: <li><a href=errata27.html#ipf>May 25, 2000:
1.127 kjell 306: Improper use of ipf <i>keep-state</i> rules can result
307: in firewall rules being bypassed. (patch included)</a>
308:
1.124 deraadt 309: </ul>
310:
311: <p>
312: <li>
1.119 deraadt 313: <a name=26></a>
314:
315: <h3><font color=#e00000>OpenBSD 2.6 Security Advisories</font></h3>
316: These are the OpenBSD 2.6 advisories -- all these problems are solved
317: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
318: OpenBSD 2.5 advisories listed below are fixed in OpenBSD 2.6.
319:
320: <p>
321: <ul>
1.130 deraadt 322: <li><a href=errata26.html#semconfig>May 26, 2000:
323: SYSV semaphore support contained an undocumented system call
1.131 deraadt 324: which could wedge semaphore-using processes from exiting. (patch included)</a>
1.127 kjell 325: <li><a href=errata26.html#ipf>May 25, 2000:
326: Improper use of ipf <i>keep-state</i> rules can result
327: in firewall rules being bypassed. (patch included)</a>
1.126 deraadt 328: <li><a href=errata26.html#xlockmore>May 25, 2000:
1.125 deraadt 329: xlockmore has a bug which a localhost attacker can use to gain
330: access to the encrypted root password hash (which is normally
331: encoded using blowfish (see
332: <a href="http://www.openbsd.org/cgi-bin/man.cgi?query=crypt&sektion=3">
333: crypt(3)</a>)
334: (patch included).</a>
1.126 deraadt 335: <li><a href=errata26.html#procfs>Jan 20, 2000:
1.123 deraadt 336: Systems running with procfs enabled and mounted are
337: vulnerable to a very tricky exploit. procfs is not
338: mounted by default.
339: (patch included).</a>
1.126 deraadt 340: <li><a href=errata26.html#ifmedia>Nov 9, 1999:
1.125 deraadt 341: Any user could change interface media configurations, resulting in
342: a localhost denial of service attack.
1.119 deraadt 343: (patch included).</a>
1.126 deraadt 344: <li><a href=errata26.html#sslUSA>Dec 2, 1999:
1.120 deraadt 345: A buffer overflow in the RSAREF code included in the
346: USA version of libssl, is possibly exploitable in
347: httpd, ssh, or isakmpd, if SSL/RSA features are enabled.
1.124 deraadt 348: (patch included).<br></a>
349: <strong>Update:</strong> Turns out that this was not exploitable
350: in any of the software included in OpenBSD 2.6.
1.126 deraadt 351: <li><a href=errata26.html#sendmail>Dec 4, 1999:
1.121 deraadt 352: Sendmail permitted any user to cause a aliases file wrap,
353: thus exposing the system to a race where the aliases file
354: did not exist.
355: (patch included).</a>
1.119 deraadt 356: </ul>
357:
358: <p>
359: <li>
360:
1.93 deraadt 361: <a name=25></a>
1.106 deraadt 362:
1.110 deraadt 363: <h3><font color=#e00000>OpenBSD 2.5 Security Advisories</font></h3>
1.93 deraadt 364: These are the OpenBSD 2.5 advisories -- all these problems are solved
365: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
366: OpenBSD 2.4 advisories listed below are fixed in OpenBSD 2.5.
367:
1.96 deraadt 368: <p>
1.104 deraadt 369: <ul>
1.117 deraadt 370: <li><a href=errata25.html#cron>Aug 30, 1999:
1.103 deraadt 371: In cron(8), make sure argv[] is NULL terminated in the
372: fake popen() and run sendmail as the user, not as root.
373: (patch included).</a>
1.117 deraadt 374: <li><a href=errata25.html#miscfs>Aug 12, 1999: The procfs and fdescfs
1.101 deraadt 375: filesystems had an overrun in their handling of uio_offset
376: in their readdir() routines. (These filesystems are not
377: enabled by default). (patch included).</a>
1.117 deraadt 378: <li><a href=errata25.html#profil>Aug 9, 1999: Stop profiling (see profil(2))
1.100 deraadt 379: when we execve() a new process. (patch included).</a>
1.117 deraadt 380: <li><a href=errata25.html#ipsec_in_use>Aug 6, 1999: Packets that should have
1.98 deraadt 381: been handled by IPsec may be transmitted as cleartext.
382: PF_KEY SA expirations may leak kernel resources.
383: (patch included).</a>
1.117 deraadt 384: <li><a href=errata25.html#rc>Aug 5, 1999: In /etc/rc, use mktemp(1) for
1.97 deraadt 385: motd re-writing and change the find(1) to use -execdir
386: (patch included).</a>
1.117 deraadt 387: <li><a href=errata25.html#chflags>Jul 30, 1999: Do not permit regular
1.95 deraadt 388: users to chflags(2) or fchflags(2) on character or block devices
389: which they may currently be the owner of (patch included).</a>
1.117 deraadt 390: <li><a href=errata25.html#nroff>Jul 27, 1999: Cause groff(1) to be invoked
1.95 deraadt 391: with the -S flag, when called by nroff(1) (patch included).</a>
1.93 deraadt 392: </ul>
393:
1.106 deraadt 394: <p>
395: <li>
1.75 deraadt 396: <a name=24></a>
1.110 deraadt 397: <h3><font color=#e00000>OpenBSD 2.4 Security Advisories</font></h3>
1.75 deraadt 398: These are the OpenBSD 2.4 advisories -- all these problems are solved
399: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
400: OpenBSD 2.3 advisories listed below are fixed in OpenBSD 2.4.
401:
1.96 deraadt 402: <p>
1.75 deraadt 403: <ul>
1.92 deraadt 404: <li><a href=errata24.html#poll>Mar 22, 1999: The nfds argument for poll(2) needs
1.91 deraadt 405: to be constrained, to avoid kvm starvation (patch included).</a>
1.92 deraadt 406: <li><a href=errata24.html#tss>Mar 21, 1999: A change in TSS handling stops
1.91 deraadt 407: another kernel crash case caused by the <strong>crashme</strong>
408: program (patch included).</a>
1.92 deraadt 409: <li><a href=errata24.html#nlink>Feb 25, 1999: An unbounded increment on the
1.90 deraadt 410: nlink value in FFS and EXT2FS filesystems can cause a system crash.
1.89 deraadt 411: (patch included).</a>
1.92 deraadt 412: <li><a href=errata24.html#ping>Feb 23, 1999: Yet another buffer overflow
1.88 deraadt 413: existed in ping(8). (patch included).</a>
1.92 deraadt 414: <li><a href=errata24.html#ipqrace>Feb 19, 1999: ipintr() had a race in use of
1.87 deraadt 415: the ipq, which could permit an attacker to cause a crash.
416: (patch included).</a>
1.92 deraadt 417: <li><a href=errata24.html#accept>Feb 17, 1999: A race condition in the
1.86 deraadt 418: kernel between accept(2) and select(2) could permit an attacker
419: to hang sockets from remote.
420: (patch included).</a>
1.92 deraadt 421: <li><a href=errata24.html#maxqueue>Feb 17, 1999: IP fragment assembly can
1.85 deraadt 422: bog the machine excessively and cause problems.
423: (patch included).</a>
1.92 deraadt 424: <li><a href=errata24.html#trctrap>Feb 12, 1999: i386 T_TRCTRAP handling and
1.84 deraadt 425: DDB interacted to possibly cause a crash.
426: (patch included).</a>
1.92 deraadt 427: <li><a href=errata24.html#rst>Feb 11, 1999: TCP/IP RST handling was sloppy.
1.83 deraadt 428: (patch included).</a>
1.92 deraadt 429: <li><a href=errata24.html#bootpd>Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 430: problem in bootpd(8). (patch included).</a>
1.92 deraadt 431: <li><a href=errata24.html#termcap>Nov 19, 1998: There is a possibly locally
1.82 deraadt 432: exploitable problem relating to environment variables in termcap
433: and curses. (patch included).</a>
1.92 deraadt 434: <li><a href=errata24.html#tcpfix>Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 435: bug in the TCP decoding kernel. (patch included).</a>
1.75 deraadt 436: </ul>
437:
1.106 deraadt 438: <p>
439: <li>
1.58 deraadt 440: <a name=23></a>
1.110 deraadt 441: <h3><font color=#e00000>OpenBSD 2.3 Security Advisories</font></h3>
1.73 deraadt 442: These are the OpenBSD 2.3 advisories -- all these problems are solved
443: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
444: OpenBSD 2.2 advisories listed below are fixed in OpenBSD 2.3.
1.53 matthieu 445:
1.96 deraadt 446: <p>
1.53 matthieu 447: <ul>
1.81 deraadt 448: <li><a href=errata23.html#bootpd>Nov 27, 1998: There is a remotely exploitable
449: problem in bootpd(8). (patch included).</a>
1.78 deraadt 450: <li><a href=errata23.html#tcpfix>Nov 13, 1998: There is a remote machine lockup
451: bug in the TCP decoding kernel. (patch included).</a>
1.76 aaron 452: <li><a href=errata23.html#fdalloc>Jul 2, 1998: setuid and setgid processes
1.72 deraadt 453: should not be executed with fd slots 0, 1, or 2 free.
454: (patch included).</a>
1.79 deraadt 455: <li><a href=errata23.html#resolver>August 31, 1998: A benign looking resolver buffer overflow bug was re-introduced accidentally (patches included).</a>
1.76 aaron 456: <li><a href=errata23.html#xlib>June 6, 1998: Further problems with the X
1.71 deraadt 457: libraries (patches included).</a>
1.76 aaron 458: <li><a href=errata23.html#pctr>June 4, 1998: on non-Intel i386 machines, any user
1.72 deraadt 459: can use pctr(4) to crash the machine.</a>
1.76 aaron 460: <li><a href=errata23.html#kill>May 17, 1998: kill(2) of setuid/setgid target
1.66 deraadt 461: processes too permissive (4th revision patch included).</a>
1.76 aaron 462: <li><a href=errata23.html#immutable>May 11, 1998: mmap() permits partial bypassing
1.60 deraadt 463: of immutable and append-only file flags. (patch included).</a>
1.76 aaron 464: <li><a href=errata23.html#xterm-xaw>May 1, 1998: Buffer overflow in xterm and Xaw
1.58 deraadt 465: (CERT advisory VB-98.04) (patch included).</a>
1.76 aaron 466: <li><a href=errata23.html#ipsec>May 5, 1998: Incorrect handling of IPSEC packets
1.59 deraadt 467: if IPSEC is enabled (patch included).</a>
1.53 matthieu 468: </ul>
1.9 deraadt 469:
1.106 deraadt 470: <p>
471: <li>
1.58 deraadt 472: <a name=22></a>
1.110 deraadt 473: <h3><font color=#e00000>OpenBSD 2.2 Security Advisories</font></h3>
1.45 deraadt 474: These are the OpenBSD 2.2 advisories. All these problems are solved
1.55 deraadt 475: in <a href=23.html>OpenBSD 2.3</a>. Some of these problems
1.45 deraadt 476: still exist in other operating systems. (The supplied patches are for
477: OpenBSD 2.2; they may or may not work on OpenBSD 2.1).
1.9 deraadt 478:
1.96 deraadt 479: <p>
1.9 deraadt 480: <ul>
1.72 deraadt 481: <li><a href=errata22.html#ipsec>May 5, 1998: Incorrect handling of IPSEC
482: packets if IPSEC is enabled (patch included).</a>
483: <li><a href=errata22.html#xterm-xaw>May 1, 1998: Buffer overflow in xterm
484: and Xaw (CERT advisory VB-98.04) (patch included).</a>
485: <li><a href=errata22.html#uucpd>Apr 22, 1998: Buffer overflow in uucpd
486: (patch included).</a>
487: <li><a href=errata22.html#rmjob>Apr 22, 1998: Buffer mismanagement in lprm
488: (patch included).</a>
489: <li><a href=errata22.html#ping>Mar 31, 1998: Overflow in ping -R (patch included).</a>
490: <li><a href=errata22.html#named>Mar 30, 1998: Overflow in named fake-iquery
1.59 deraadt 491: (patch included).</a>
1.72 deraadt 492: <li><a href=errata22.html#mountd>Mar 2, 1998: Accidental NFS filesystem
493: export (patch included).</a>
1.112 philen 494: <li><a href="advisories/mmap.txt">Feb 26, 1998: Read-write mmap() flaw.</a>
1.72 deraadt 495: Revision 3 of the patch is available <a href=errata22.html#mmap>here</a>
1.112 philen 496: <li><a href="advisories/sourceroute.txt">Feb 19, 1998: Sourcerouted Packet
1.59 deraadt 497: Acceptance.</a>
1.50 deraadt 498: A patch is available <a href=errata22.html#sourceroute>here</a>.
1.122 rohee 499: <li><a href=errata22.html#ruserok>Feb 13, 1998: Setuid coredump & Ruserok()
1.72 deraadt 500: flaw (patch included).</a>
501: <li><a href=errata22.html#ldso>Feb 9, 1998: MIPS ld.so flaw (patch included).</a>
502: <li><a href=errata22.html#f00f>Dec 10, 1997: Intel P5 f00f lockup
1.59 deraadt 503: (patch included).</a>
1.1 deraadt 504: </ul>
505:
1.106 deraadt 506: <p>
507: <li>
1.58 deraadt 508: <a name=21></a>
1.110 deraadt 509: <h3><font color=#e00000>OpenBSD 2.1 Security Advisories</font></h3>
1.52 deraadt 510: These are the OpenBSD 2.1 advisories. All these problems are solved
511: in <a href=22.html>OpenBSD 2.2</a>. Some of these problems still
512: exist in other operating systems. (If you are running OpenBSD 2.1, we
513: would strongly recommend an upgrade to the newest release, as this
514: patch list only attempts at fixing the most important security
515: problems. In particular, OpenBSD 2.2 fixes numerous localhost
516: security problems. Many of those problems were solved in ways which
517: make it hard for us to provide patches).
518:
1.96 deraadt 519: <p>
1.52 deraadt 520: <ul>
1.112 philen 521: <li><a href="advisories/signals.txt">Sep 15, 1997: Deviant Signals (patch included)</a>
522: <li><a href="advisories/rfork.txt">Aug 2, 1997: Rfork() system call flaw
1.59 deraadt 523: (patch included)</a>
1.112 philen 524: <li><a href="advisories/procfs.txt">Jun 24, 1997: Procfs flaws (patch included)</a>
1.52 deraadt 525: </ul>
1.51 deraadt 526:
1.106 deraadt 527: <p>
528: <li>
529: <a name=20></a>
1.110 deraadt 530: <h3><font color=#e00000>OpenBSD 2.0 Security Advisories</font></h3>
1.99 deraadt 531: These are the OpenBSD 2.0 advisories. All these problems are solved
532: in <a href=21.html>OpenBSD 2.1</a>. Some of these problems still
533: exist in other operating systems. (If you are running OpenBSD 2.0, we
534: commend you for being there back in the old days!, but you're really
535: missing out if you don't install a new version!)
536:
537: <p>
538: <ul>
1.112 philen 539: <li><a href="advisories/res_random.txt">April 22, 1997: Predictable IDs in the
1.99 deraadt 540: resolver (patch included)</a>
541: <li>Many others... if people can hunt them down, please let me know
542: and we'll put them up here.
543: </ul>
544:
1.106 deraadt 545: </dl>
1.51 deraadt 546: <p>
1.106 deraadt 547:
548: <a name=watching></a>
1.110 deraadt 549: <li><h3><font color=#e00000>Watching our Changes</font></h3><p>
1.106 deraadt 550:
1.21 deraadt 551: Since we take a proactive stance with security, we are continually
552: finding and fixing new security problems. Not all of these problems
1.80 espie 553: get widely reported because (as stated earlier) many of them are not
1.45 deraadt 554: confirmed to be exploitable; many simple bugs we fix do turn out to
555: have security consequences we could not predict. We do not have the
556: time resources to make these changes available in the above format.<p>
1.21 deraadt 557:
558: Thus there are usually minor security fixes in the current source code
559: beyond the previous major OpenBSD release. We make a limited
1.45 deraadt 560: guarantee that these problems are of minimal impact and unproven
1.44 ian 561: exploitability. If we discover that a problem definitely matters for
1.45 deraadt 562: security, patches will show up here <strong>VERY</strong> quickly.<p>
1.21 deraadt 563:
1.45 deraadt 564: People who are really concerned with security can do a number of
565: things:<p>
1.21 deraadt 566:
567: <ul>
568: <li>If you understand security issues, watch our
1.27 deraadt 569: <a href=mail.html>source-changes mailing list</a> and keep an
1.23 deraadt 570: eye out for things which appear security related. Since
1.21 deraadt 571: exploitability is not proven for many of the fixes we make,
572: do not expect the relevant commit message to say "SECURITY FIX!".
573: If a problem is proven and serious, a patch will be available
574: here very shortly after.
1.161 horacio 575: <li>In addition to source changes, you can watch our <a href="mail.html">
1.160 ericj 576: security-announce mailing list</a> which will notify you for every
577: security related item that the OpenBSD team deams as a possible threat,
578: and instruct you on how to patch the problem.
1.21 deraadt 579: <li>Track our current source code tree, and teach yourself how to do a
1.29 deraadt 580: complete system build from time to time (read /usr/src/Makefile
581: carefully). Users can make the assumption that the current
582: source tree always has stronger security than the previous release.
1.45 deraadt 583: However, building your own system from source code is not trivial;
584: it is nearly 300MB of source code, and problems do occur as we
585: transition between major releases.
1.115 ericj 586: <li>Install a binary snapshot for your
1.80 espie 587: architecture, which are made available fairly often. For
1.29 deraadt 588: instance, an i386 snapshot is typically made available weekly.
1.21 deraadt 589: </ul>
590:
1.9 deraadt 591: <p>
1.153 jufi 592: <a name=reporting></a>
1.110 deraadt 593: <li><h3><font color=#e00000>Reporting problems</font></h3><p>
1.3 deraadt 594:
1.5 deraadt 595: <p> If you find a new security problem, you can mail it to
1.6 deraadt 596: <a href=mailto:deraadt@openbsd.org>deraadt@openbsd.org</a>.
1.7 deraadt 597: <br>
1.5 deraadt 598: If you wish to PGP encode it (but please only do so if privacy is very
1.112 philen 599: urgent, since it is inconvenient) use this <a href="advisories/pgpkey.txt">pgp key</a>.
1.5 deraadt 600:
1.107 deraadt 601: <p>
602: <a name=papers></a>
1.110 deraadt 603: <li><h3><font color=#e00000>Further Reading</font></h3><p>
1.107 deraadt 604:
605: A number of papers have been written by OpenBSD team members, about security
606: related changes they have done in OpenBSD. The postscript versions of these
1.108 deraadt 607: documents are available as follows.<p>
1.107 deraadt 608:
609: <ul>
1.113 deraadt 610: <li>A Future-Adaptable Password Scheme.<br>
1.118 deraadt 611: <a href=events.html#usenix99>Usenix 1999</a>,
1.153 jufi 612: by <a href=mailto:provos@openbsd.org>Niels Provos</a>,
1.113 deraadt 613: <a href=mailto:dm@openbsd.org>David Mazieres</a>.<br>
1.107 deraadt 614: <a href=papers/bcrypt-paper.ps>paper</a> and
615: <a href=papers/bcrypt-slides.ps>slides</a>.
1.113 deraadt 616: <p>
617: <li>Cryptography in OpenBSD: An Overview.<br>
1.118 deraadt 618: <a href=events.html#usenix99>Usenix 1999</a>,
1.113 deraadt 619: by <a href=mailto:deraadt@openbsd.org>Theo de Raadt</a>,
620: <a href=mailto:niklas@openbsd.org>Niklas Hallqvist</a>,
621: <a href=mailto:art@openbsd.org>Artur Grabowski</a>,
622: <a href=mailto:angelos@openbsd.org>Angelos D. Keromytis</a>,
623: <a href=mailto:provos@openbsd.org>Niels Provos</a>.<br>
1.107 deraadt 624: <a href=papers/crypt-paper.ps>paper</a> and
625: <a href=papers/crypt-slides.ps>slides</a>.
1.113 deraadt 626: <p>
627: <li>strlcpy and strlcat -- consistent, safe, string copy and concatenation.<br>
1.118 deraadt 628: <a href=events.html#usenix99>Usenix 1999</a>,
1.113 deraadt 629: by <a href=mailto:millert@openbsd.org>Todd C. Miller</a>,
630: <a href=mailto:deraadt@openbsd.org>Theo de Raadt</a>.<br>
1.109 deraadt 631: <a href=papers/strlcpy-paper.ps>paper</a> and
632: <a href=papers/strlcpy-slides.ps>slides</a>.
1.113 deraadt 633: <p>
1.118 deraadt 634: <li>Dealing with Public Ethernet Jacks-Switches, Gateways, and Authentication.<br>
635: <a href=events.html#lisa99>LISA 1999</a>,
636: by <a href=mailto:beck@openbsd.org>Bob Beck</a>.<br>
637: <a href=papers/authgw-paper.ps>paper</a> and
638: <a href=papers/authgw-slides.ps>slides</a>.
639: <p>
1.153 jufi 640: <li>Encrypting Virtual Memory<br>
1.142 deraadt 641: <a href=events.html#sec2000>Usenix Security 2000</a>,
642: <a href=mailto:provos@openbsd.org>Niels Provos</a>.<br>
1.143 provos 643: <a href=papers/swapencrypt.ps>paper</a> and
644: <a href=papers/swapencrypt-slides.ps>slides</a>.
1.142 deraadt 645: <p>
1.107 deraadt 646: </ul>
647:
1.106 deraadt 648: </dl>
649:
1.2 deraadt 650: <hr>
1.68 pauls 651: <a href=index.html><img height=24 width=24 src=back.gif border=0 alt=OpenBSD></a>
1.24 deraadt 652: <a href=mailto:www@openbsd.org>www@openbsd.org</a>
653: <br>
1.171 ! millert 654: <small>$OpenBSD: security.html,v 1.170 2001/04/10 07:07:28 ericj Exp $</small>
1.1 deraadt 655:
1.24 deraadt 656: </body>
657: </html>
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