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1.106 deraadt 17: <p>
1.294 david 18: <h2><font color="#e00000">Security</font></h2>
19: <hr>
1.1 deraadt 20:
1.114 philen 21: <table width="100%">
22: <tr>
23: <td colspan="2">
24: <strong>Index</strong>
25: </td>
26: </tr>
27: <tr>
28: <td valign="top">
1.294 david 29: <a href="#goals">Security goals of the Project</a>.<br>
30: <a href="#disclosure">Full Disclosure policy</a>.<br>
31: <a href="#process">Source code auditing process</a>.<br>
32: <a href="#default">"Secure by Default"</a>.<br>
33: <a href="#crypto">Use of Cryptography</a>.<br>
34: <p>
35: <a href="#watching">Watching changes</a>.<br>
36: <a href="#reporting">Reporting security issues</a>.<br>
37: <a href="#papers">Further Reading</a><br>
1.106 deraadt 38: <p>
1.114 philen 39: </td>
40: <td valign="top">
1.225 deraadt 41: For security advisories for specific releases, click below:<br>
42: <a href="#20">2.0</a>,
43: <a href="#21">2.1</a>,
44: <a href="#22">2.2</a>,
45: <a href="#23">2.3</a>,
46: <a href="#24">2.4</a>,
47: <a href="#25">2.5</a>,
48: <a href="#26">2.6</a>,
49: <a href="#27">2.7</a>,
50: <a href="#28">2.8</a>,
51: <a href="#29">2.9</a>,
52: <a href="#30">3.0</a>,
53: <a href="#31">3.1</a>,
1.246 deraadt 54: <a href="#32">3.2</a>,
1.261 david 55: <a href="#33">3.3</a>,
1.280 david 56: <a href="#34">3.4</a>,
1.301 ! miod 57: <a href="#35">3.5</a>,
! 58: <a href="#36">3.6</a>.
1.114 philen 59: </td>
60: </tr>
61: </table>
1.56 deraadt 62: <hr>
63:
1.294 david 64: <a name="goals"></a>
1.278 deraadt 65: <ul>
1.294 david 66: <li><h3><font color="#e00000">Goal</font></h3><p>
1.22 deraadt 67:
1.14 deraadt 68: OpenBSD believes in strong security. Our aspiration is to be NUMBER
1.22 deraadt 69: ONE in the industry for security (if we are not already there). Our
70: open software development model permits us to take a more
71: uncompromising view towards increased security than Sun, SGI, IBM, HP,
72: or other vendors are able to. We can make changes the vendors would
1.27 deraadt 73: not make. Also, since OpenBSD is exported with <a href=crypto.html>
1.45 deraadt 74: cryptography</a>, we are able to take cryptographic approaches towards
75: fixing security problems.<p>
1.18 deraadt 76:
1.288 matthieu 77: <a name="disclosure"></a>
1.294 david 78: <li><h3><font color="#e00000">Full Disclosure</font></h3><p>
1.106 deraadt 79:
1.45 deraadt 80: Like many readers of the
1.196 jufi 81: <a href="http://online.securityfocus.com/archive/1">
1.18 deraadt 82: BUGTRAQ mailing list</a>,
1.106 deraadt 83: we believe in full disclosure of security problems. In the
84: operating system arena, we were probably the first to embrace
85: the concept. Many vendors, even of free software, still try
86: to hide issues from their users.<p>
87:
88: Security information moves very fast in cracker circles. On the other
89: hand, our experience is that coding and releasing of proper security
90: fixes typically requires about an hour of work -- very fast fix
91: turnaround is possible. Thus we think that full disclosure helps the
92: people who really care about security.<p>
93:
1.288 matthieu 94: <a name="process"></a>
1.294 david 95: <li><h3><font color="#e00000">Audit Process</font></h3><p>
1.15 deraadt 96:
1.12 deraadt 97: Our security auditing team typically has between six and twelve
1.45 deraadt 98: members who continue to search for and fix new security holes. We
99: have been auditing since the summer of 1996. The process we follow to
100: increase security is simply a comprehensive file-by-file analysis of
1.106 deraadt 101: every critical software component. We are not so much looking for
102: security holes, as we are looking for basic software bugs, and if
1.138 deraadt 103: years later someone discovers the problem used to be a security
1.106 deraadt 104: issue, and we fixed it because it was just a bug, well, all the
105: better. Flaws have been found in just about every area of the system.
106: Entire new classes of security problems have been found during our
107: audit, and often source code which had been audited earlier needs
108: re-auditing with these new flaws in mind. Code often gets audited
109: multiple times, and by multiple people with different auditing
110: skills.<p>
1.12 deraadt 111:
1.94 deraadt 112: Some members of our security auditing team worked for Secure Networks,
113: the company that made the industry's premier network security scanning
114: software package Ballista (Secure Networks got purchased by Network
115: Associates, Ballista got renamed to Cybercop Scanner, and well...)
116: That company did a lot of security research, and thus fit in well
1.106 deraadt 117: with the OpenBSD stance. OpenBSD passed Ballista's tests with flying
118: colours since day 1.<p>
1.31 deraadt 119:
1.34 deraadt 120: Another facet of our security auditing process is its proactiveness.
1.45 deraadt 121: In most cases we have found that the determination of exploitability
122: is not an issue. During our ongoing auditing process we find many
123: bugs, and endeavor to fix them even though exploitability is not
124: proven. We fix the bug, and we move on to find other bugs to fix. We
125: have fixed many simple and obvious careless programming errors in code
126: and only months later discovered that the problems were in fact
127: exploitable. (Or, more likely someone on
1.197 jufi 128: <a href="http://online.securityfocus.com/archive/1">BUGTRAQ</a>
1.45 deraadt 129: would report that other operating systems were vulnerable to a `newly
130: discovered problem', and then it would be discovered that OpenBSD had
131: been fixed in a previous release). In other cases we have been saved
132: from full exploitability of complex step-by-step attacks because we
133: had fixed one of the intermediate steps. An example of where we
1.94 deraadt 134: managed such a success is the lpd advisory that Secure Networks put out.
135: <p>
1.29 deraadt 136:
1.288 matthieu 137: <a name="newtech"></a>
1.294 david 138: <li><h3><font color="#e00000">New Technologies</font></h3><p>
1.278 deraadt 139:
140: As we audit source code, we often invent new ways of solving problems.
141: Sometimes these ideas have been used before in some random application
142: written somewhere, but perhaps not taken to the degree that we do.
143: <p>
144:
145: <ul>
146: <li>strlcpy() and strlcat()
147: <li>Memory protection purify
148: <ul>
149: <li>W^X
150: <li>.rodata segment
151: <li>Guard pages
152: <li>Randomized malloc()
153: <li>Randomized mmap()
154: <li>atexit() and stdio protection
155: </ul>
1.295 otto 156: <li>Privilege separation
1.278 deraadt 157: <li>Privilege revocation
158: <li>Chroot jailing
159: <li>New uids
160: <li>ProPolice
161: <li>... and others
162: </ul>
163: <p>
164:
1.294 david 165: <li><h3><font color="#e00000">The Reward</font></h3><p>
1.106 deraadt 166:
1.45 deraadt 167: Our proactive auditing process has really paid off. Statements like
1.35 deraadt 168: ``This problem was fixed in OpenBSD about 6 months ago'' have become
1.45 deraadt 169: commonplace in security forums like
1.197 jufi 170: <a href="http://online.securityfocus.com/archive/1">BUGTRAQ</a>.<p>
1.35 deraadt 171:
1.45 deraadt 172: The most intense part of our security auditing happened immediately
1.80 espie 173: before the OpenBSD 2.0 release and during the 2.0->2.1 transition,
1.45 deraadt 174: over the last third of 1996 and first half of 1997. Thousands (yes,
175: thousands) of security issues were fixed rapidly over this year-long
176: period; bugs like the standard buffer overflows, protocol
177: implementation weaknesses, information gathering, and filesystem
178: races. Hence most of the security problems that we encountered were
179: fixed before our 2.1 release, and then a far smaller number needed
180: fixing for our 2.2 release. We do not find as many problems anymore,
181: it is simply a case of diminishing returns. Recently the security
182: problems we find and fix tend to be significantly more obscure or
183: complicated. Still we will persist for a number of reasons:<p>
1.36 deraadt 184:
1.35 deraadt 185: <ul>
1.45 deraadt 186: <li>Occasionally we find a simple problem we missed earlier. Doh!
1.35 deraadt 187: <li>Security is like an arms race; the best attackers will continue
1.45 deraadt 188: to search for more complicated exploits, so we will too.
189: <li>Finding and fixing subtle flaws in complicated software is
190: a lot of fun.
1.35 deraadt 191: </ul>
1.106 deraadt 192: <p>
1.15 deraadt 193:
1.14 deraadt 194: The auditing process is not over yet, and as you can see we continue
1.28 deraadt 195: to find and fix new security flaws.<p>
1.12 deraadt 196:
1.288 matthieu 197: <a name="default"></a>
1.294 david 198: <li><h3><font color="#e00000">"Secure by Default"</font></h3><p>
1.106 deraadt 199:
200: To ensure that novice users of OpenBSD do not need to become security
201: experts overnight (a viewpoint which other vendors seem to have), we
202: ship the operating system in a Secure by Default mode. All non-essential
203: services are disabled. As the user/administrator becomes more familiar
204: with the system, he will discover that he has to enable daemons and other
205: parts of the system. During the process of learning how to enable a new
206: service, the novice is more likely to learn of security considerations.<p>
207:
208: This is in stark contrast to the increasing number of systems that
209: ship with NFS, mountd, web servers, and various other services enabled
210: by default, creating instantaneous security problems for their users
211: within minutes after their first install.<p>
212:
1.288 matthieu 213: <a name="crypto"></a>
1.294 david 214: <li><h3><font color="#e00000">Cryptography</font></h3><p>
1.106 deraadt 215:
216: And of course, since the OpenBSD project is based in Canada, it is possible
217: for us to integrate cryptography. For more information, read the page
1.116 deraadt 218: outlining <a href=crypto.html>what we have done with cryptography</a>.</p>
1.106 deraadt 219:
1.294 david 220: <li><h3><font color="#e00000">Advisories</font></h3><p>
1.106 deraadt 221:
222: <li>
1.301 ! miod 223: <a name="36"></a>
! 224:
! 225: <h3><font color="#e00000">OpenBSD 3.6 Security Advisories</font></h3>
! 226: These are the OpenBSD 3.6 advisories -- all these problems are solved
! 227: in <a href=anoncvs.html>OpenBSD current</a> and the
! 228: <a href=stable.html>patch branch</a>.
! 229:
! 230: <p>
! 231: There are no security advisories for OpenBSD 3.6 at the moment.
! 232:
! 233: <p>
! 234: <li>
1.288 matthieu 235: <a name="35"></a>
1.279 deraadt 236:
1.294 david 237: <h3><font color="#e00000">OpenBSD 3.5 Security Advisories</font></h3>
1.279 deraadt 238: These are the OpenBSD 3.5 advisories -- all these problems are solved
239: in <a href=anoncvs.html>OpenBSD current</a> and the
240: <a href=stable.html>patch branch</a>.
241:
242: <p>
243: <ul>
1.301 ! miod 244: <li><a href="errata35.html#radius">Sep 20, 2004:
1.299 millert 245: Radius-based authentication is vulnerable to spoofed replies.</a>
1.301 ! miod 246: <li><a href="errata35.html#xpm">Sep 16, 2004:
1.298 brad 247: The Xpm library has vulnerabilities when parsing malicious images.</a>
1.301 ! miod 248: <li><a href="errata35.html#httpd2"> Sep 10, 2004:
1.297 brad 249: httpd(8)'s mod_rewrite module can be made to write one zero byte in
250: an arbitrary memory position outside of a char array, causing a DoS
251: or possibly buffer overflows.</a>
1.301 ! miod 252: <li><a href="errata35.html#httpd"> Jun 12, 2004:
1.300 deraadt 253: Multiple vulnerabilities have been found in httpd(8) / mod_ssl.</a>
1.301 ! miod 254: <li><a href="errata35.html#isakmpd"> Jun 10, 2004:
1.291 hshoexer 255: isakmpd(8) still has issues with unauthorized SA deletion,
1.293 brad 256: an attacker can delete IPsec tunnels at will.</a>
1.301 ! miod 257: <li><a href="errata35.html#cvs3"> Jun 9, 2004:
1.290 millert 258: Multiple remote vulnerabilities have been found in the cvs(1)
259: server which can be used by CVS clients to crash or execute
1.293 brad 260: arbitrary code on the server.</a>
1.301 ! miod 261: <li><a href="errata35.html#kerberos"> May 30, 2004:
1.289 beck 262: kdc(8) performs inadequate checking of request fields, leading
263: to the possibility of principal impersonation from other
264: Kerberos realms if they are trusted with a cross-realm trust.</a>
1.301 ! miod 265: <li><a href="errata35.html#xdm"> May 26, 2004:
1.287 matthieu 266: xdm(1) ignores the requestPort resource and creates a
1.293 brad 267: listening socket regardless of the setting in xdm-config.</a>
1.301 ! miod 268: <li><a href="errata35.html#cvs2"> May 20, 2004:
1.286 otto 269: A buffer overflow in the cvs(1) server has been found,
270: which can be used by CVS clients to execute arbitrary code on
1.293 brad 271: the server.</a>
1.301 ! miod 272: <li><a href="errata35.html#procfs"> May 13, 2004:
1.282 tedu 273: Integer overflow problems were found in procfs, allowing
1.293 brad 274: reading of arbitrary kernel memory.</a>
1.301 ! miod 275: <li><a href="errata35.html#cvs"> May 5, 2004:
1.281 otto 276: Pathname validation problems have been found in cvs(1),
277: allowing clients and servers access to files outside the
1.293 brad 278: repository or local CVS tree.</a>
1.279 deraadt 279: </ul>
280:
281: <p>
1.301 ! miod 282: OpenBSD 3.4 and earlier releases are not supported anymore. The following
! 283: paragraphs only list advisories issued while they were maintained; these
! 284: releases are likely to be affected by the advisories for more recent releases.
! 285: <br>
! 286:
1.279 deraadt 287: <li>
1.288 matthieu 288: <a name="34"></a>
1.261 david 289:
1.294 david 290: <h3><font color="#e00000">OpenBSD 3.4 Security Advisories</font></h3>
1.261 david 291: These are the OpenBSD 3.4 advisories -- all these problems are solved
1.301 ! miod 292: in <a href="anoncvs.html">OpenBSD current</a>. The
! 293: <a href="stable.html">patch branch</a> for 3.4 is no longer being maintained,
! 294: you should update your machine.
1.261 david 295: <p>
296: <ul>
1.298 brad 297: <li><a href="errata34.html#xpm">Sep 16, 2004:
298: The Xpm library has vulnerabilities when parsing malicious images.</a>
1.297 brad 299: <li><a href="errata34.html#httpd4"> Sep 10, 2004:
300: httpd(8)'s mod_rewrite module can be made to write one zero byte in
301: an arbitrary memory position outside of a char array, causing a DoS
302: or possibly buffer overflows.</a>
1.294 david 303: <li><a href="errata34.html#httpd3"> Jun 12, 2004:
1.300 deraadt 304: Multiple vulnerabilities have been found in httpd(8) / mod_ssl.</a>
1.294 david 305: <li><a href="errata34.html#isakmpd3"> Jun 10, 2004:
1.292 brad 306: isakmpd(8) still has issues with unauthorized SA deletion,
1.293 brad 307: an attacker can delete IPsec tunnels at will.</a>
1.294 david 308: <li><a href="errata34.html#cvs3"> Jun 9, 2004:
1.290 millert 309: Multiple remote vulnerabilities have been found in the cvs(1)
310: server which can be used by CVS clients to crash or execute
1.293 brad 311: arbitrary code on the server.</a>
1.294 david 312: <li><a href="errata34.html#kerberos"> May 30, 2004:
1.289 beck 313: kdc(8) performs inadequate checking of request fields, leading
314: to the possibility of principal impersonation from other
315: Kerberos realms if they are trusted with a cross-realm trust.</a>
1.294 david 316: <li><a href="errata34.html#cvs2"> May 20, 2004:
1.286 otto 317: A buffer overflow in the cvs(1) server has been found,
318: which can be used by CVS clients to execute arbitrary code on
319: the server.</a>
1.294 david 320: <li><a href="errata34.html#procfs"> May 13, 2004:
1.282 tedu 321: Integer overflow problems were found in procfs, allowing
322: reading of arbitrary kernel memory.</a>
1.294 david 323: <li><a href="errata34.html#cvs"> May 5, 2004:
1.281 otto 324: Pathname validation problems have been found in cvs(1),
325: allowing clients and servers access to files outside the
326: repository or local CVS tree.</a>
1.294 david 327: <li><a href="errata34.html#openssl"> March 17, 2004:
1.277 millert 328: A missing check for a NULL-pointer dereference may allow a
1.281 otto 329: remote attacker to crash applications using OpenSSL.</a>
1.294 david 330: <li><a href="errata34.html#isakmpd2"> March 17, 2004:
1.276 brad 331: Defects in the payload validation and processing functions of
332: isakmpd have been discovered. An attacker could send malformed
333: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.294 david 334: <li><a href="errata34.html#httpd2"> March 13, 2004:
1.275 brad 335: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
336: access module, using IP addresses without a netmask on big endian
337: 64-bit platforms causes the rules to fail to match.</a>
1.294 david 338: <li><a href="errata34.html#ip6"> February 8, 2004:
1.272 dhartmei 339: An IPv6 MTU handling problem exists that could be used by an
340: attacker to cause a denial of service attack.</a>
1.294 david 341: <li><a href="errata34.html#sysvshm"> February 5, 2004:
1.271 millert 342: A reference counting bug in shmat(2) could be used to write to
343: kernel memory under certain circumstances.</a>
1.294 david 344: <li><a href="errata34.html#isakmpd">January 13, 2004:
1.266 brad 345: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 346: by Thomas Walpuski.</a>
1.294 david 347: <li><a href="errata34.html#ibcs2">November 17, 2003:
1.264 henning 348: It may be possible for a local user to overrun the stack in
349: compat_ibcs2(8) and cause a kernel panic.</a>
1.294 david 350: <li><a href="errata34.html#asn1">November 1, 2003:
1.262 margarid 351: The use of certain ASN.1 encodings or malformed public keys may
352: allow an attacker to mount a denial of service attack against
353: applications linked with ssl(3).</a>
1.261 david 354: </ul>
355:
356: <li>
1.288 matthieu 357: <a name="33"></a>
1.246 deraadt 358:
1.294 david 359: <h3><font color="#e00000">OpenBSD 3.3 Security Advisories</font></h3>
1.246 deraadt 360: These are the OpenBSD 3.3 advisories -- all these problems are solved
1.294 david 361: in <a href="anoncvs.html">OpenBSD current</a>. The
362: <a href="stable.html">patch branch</a> for 3.3 is no longer being maintained,
1.284 otto 363: you should update your machine.
1.246 deraadt 364: <p>
365: <ul>
1.294 david 366: <li><a href="errata33.html#cvs"> May 5, 2004:
1.281 otto 367: Pathname validation problems have been found in cvs(1),
368: allowing clients and servers access to files outside the
369: repository or local CVS tree.</a>
1.294 david 370: <li><a href="errata33.html#openssl"> March 17, 2004:
1.277 millert 371: A missing check for a NULL-pointer dereference may allow a
1.281 otto 372: remote attacker to crash applications using OpenSSL.</a>
1.294 david 373: <li><a href="errata33.html#isakmpd2"> March 17, 2004:
1.276 brad 374: Defects in the payload validation and processing functions of
375: isakmpd have been discovered. An attacker could send malformed
376: ISAKMP messages and cause isakmpd to crash or to loop endlessly.</a>
1.294 david 377: <li><a href="errata33.html#httpd2"> March 13, 2004:
1.275 brad 378: Due to a bug in the parsing of Allow/Deny rules for httpd(8)'s
379: access module, using IP addresses without a netmask on big endian
380: 64-bit platforms causes the rules to fail to match.</a>
1.294 david 381: <li><a href="errata33.html#ip6"> February 8, 2004:
1.275 brad 382: An IPv6 MTU handling problem exists that could be used by an
383: attacker to cause a denial of service attack.</a>
1.294 david 384: <li><a href="errata33.html#sysvshm"> February 5, 2004:
1.271 millert 385: A reference counting bug in shmat(2) could be used to write to
386: kernel memory under certain circumstances.</a>
1.294 david 387: <li><a href="errata33.html#isakmpd">January 15, 2004:
1.268 brad 388: Several message handling flaws in isakmpd(8) have been reported
1.271 millert 389: by Thomas Walpuski.</a>
1.294 david 390: <li><a href="errata33.html#ibcs2">November 17, 2003:
1.264 henning 391: It may be possible for a local user to execute arbitrary code
392: resulting in escalation of privileges due to a stack overrun
393: in compat_ibcs2(8).</a>
1.294 david 394: <li><a href="errata33.html#asn1">October 1, 2003:
1.257 millert 395: The use of certain ASN.1 encodings or malformed public keys may
396: allow an attacker to mount a denial of service attack against
397: applications linked with ssl(3).</a>
1.294 david 398: <li><a href="errata33.html#pfnorm">September 24, 2003:
1.258 beck 399: Access of freed memory in pf(4) could be used to
1.260 margarid 400: remotely panic a machine using scrub rules.</a>
1.294 david 401: <li><a href="errata33.html#sendmail">September 17, 2003:
1.256 millert 402: A buffer overflow in the address parsing in
403: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 404: <li><a href="errata33.html#sshbuffer">September 16, 2003:
1.255 millert 405: OpenSSH versions prior to 3.7 contains a buffer management error
406: that is potentially exploitable.</a>
1.294 david 407: <li><a href="errata33.html#sysvsem">September 10, 2003:
1.254 millert 408: Root may be able to reduce the security level by taking advantage of
409: an integer overflow when the semaphore limits are made very large.</a>
1.294 david 410: <li><a href="errata33.html#semget">August 20, 2003:
1.252 millert 411: An improper bounds check in the kernel may allow a local user
412: to panic the kernel.</a>
1.294 david 413: <li><a href="errata33.html#realpath">August 4, 2003:
1.249 millert 414: An off-by-one error exists in the C library function realpath(3)
415: may allow an attacker to gain escalated privileges.</a>
1.246 deraadt 416: </ul>
417:
1.265 miod 418:
1.247 david 419: <p>
1.246 deraadt 420: <li>
1.288 matthieu 421: <a name="32"></a>
1.224 deraadt 422:
1.294 david 423: <h3><font color="#e00000">OpenBSD 3.2 Security Advisories</font></h3>
1.224 deraadt 424: These are the OpenBSD 3.2 advisories -- all these problems are solved
1.294 david 425: in <a href="anoncvs.html">OpenBSD current</a>. The
426: <a href="stable.html">patch branch</a> for 3.2 is no longer being maintained,
1.265 miod 427: you should update your machine.
1.224 deraadt 428: <p>
429: <ul>
1.294 david 430: <li><a href="errata32.html#asn1">October 1, 2003:
1.257 millert 431: The use of certain ASN.1 encodings or malformed public keys may
432: allow an attacker to mount a denial of service attack against
433: applications linked with ssl(3). This does not affect OpenSSH.</a>
1.294 david 434: <li><a href="errata32.html#pfnorm">September 24, 2003:
1.258 beck 435: Access of freed memory in pf(4) could be used to
1.260 margarid 436: remotely panic a machine using scrub rules.</a>
1.294 david 437: <li><a href="errata32.html#sendmail4">September 17, 2003:
1.256 millert 438: A buffer overflow in the address parsing in
439: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 440: <li><a href="errata32.html#sshbuffer">September 16, 2003:
1.255 millert 441: OpenSSH versions prior to 3.7 contains a buffer management error
442: that is potentially exploitable.</a>
1.294 david 443: <li><a href="errata32.html#sendmail3">August 25, 2003:
1.253 brad 444: Fix for a potential security issue in
445: sendmail(8) with respect to DNS maps.</a>
1.294 david 446: <li><a href="errata32.html#realpath">August 4, 2003:
1.249 millert 447: An off-by-one error exists in the C library function realpath(3)
448: may allow an attacker to gain escalated privileges.</a>
1.294 david 449: <li><a href="errata32.html#sendmail2">March 31, 2003:
1.244 miod 450: A buffer overflow in the address parsing in
451: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 452: <li><a href="errata32.html#kerberos">March 24, 2003:
1.242 millert 453: A cryptographic weaknesses in the Kerberos v4 protocol can be
454: exploited on Kerberos v5 as well.</a>
1.294 david 455: <li><a href="errata32.html#kpr">March 19, 2003:
1.241 jufi 456: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 457: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.294 david 458: <li><a href="errata32.html#blinding">March 18, 2003:
1.239 miod 459: Various SSL and TLS operations in OpenSSL are vulnerable to
460: timing attacks.</a>
1.294 david 461: <li><a href="errata32.html#lprm">March 5, 2003:
1.238 millert 462: A buffer overflow in lprm(1) may allow an attacker to elevate
463: privileges to user daemon.</a>.
1.294 david 464: <li><a href="errata32.html#sendmail">March 3, 2003:
1.237 miod 465: A buffer overflow in the envelope comments processing in
466: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 467: <li><a href="errata32.html#httpd">February 25, 2003:
1.236 margarid 468: httpd(8) leaks file inode numbers via ETag header as well as
469: child PIDs in multipart MIME boundary generation. This could
470: lead, for example, to NFS exploitation because it uses inode
471: numbers as part of the file handle.</a>
1.294 david 472: <li><a href="errata32.html#ssl">February 22, 2003:
1.234 margarid 473: In ssl(8) an information leak can occur via timing by performing
474: a MAC computation even if incorrect block cipher padding has
475: been found, this is a countermeasure. Also, check for negative
476: sizes, in allocation routines.</a>
1.294 david 477: <li><a href="errata32.html#cvs">January 20, 2003:
1.232 millert 478: A double free exists in cvs(1) that could lead to privilege
479: escalation for cvs configurations where the cvs command is
1.233 margarid 480: run as a privileged user.</a>
1.294 david 481: <li><a href="errata32.html#named">November 14, 2002:
1.230 millert 482: A buffer overflow exists in named(8) that could lead to a
483: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 484: <li><a href="errata32.html#pool">November 6, 2002:
1.233 margarid 485: A logic error in the pool kernel memory allocator could cause
486: memory corruption in low-memory situations, causing the system
487: to crash.</a>
1.294 david 488: <li><a href="errata32.html#smrsh">November 6, 2002:
1.229 miod 489: An attacker can bypass smrsh(8)'s restrictions and execute
490: arbitrary commands with the privileges of his own account.</a>
1.294 david 491: <li><a href="errata32.html#pfbridge">November 6, 2002:
1.233 margarid 492: Network bridges running pf with scrubbing enabled could cause
493: mbuf corruption, causing the system to crash.</a>
1.294 david 494: <li><a href="errata32.html#kadmin">October 21, 2002:
1.228 miod 495: A buffer overflow can occur in the kadmind(8) daemon, leading
496: to possible remote crash or exploit.</a>
1.224 deraadt 497: </ul>
498:
1.227 miod 499: <p>
500: <li>
1.288 matthieu 501: <a name="31"></a>
1.203 deraadt 502:
1.294 david 503: <h3><font color="#e00000">OpenBSD 3.1 Security Advisories</font></h3>
1.203 deraadt 504: These are the OpenBSD 3.1 advisories -- all these problems are solved
1.294 david 505: in <a href="anoncvs.html">OpenBSD current</a>. The
506: <a href="stable.html">patch branch</a> for 3.1 is no longer being maintained,
1.258 beck 507: you should update your machine.
1.203 deraadt 508:
509: <p>
510: <ul>
1.294 david 511: <li><a href="errata31.html#sendmail2">March 31, 2003:
1.244 miod 512: A buffer overflow in the address parsing in
513: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 514: <li><a href="errata31.html#kerberos">March 24, 2003:
1.242 millert 515: A cryptographic weaknesses in the Kerberos v4 protocol can be
516: exploited on Kerberos v5 as well.</a>
1.294 david 517: <li><a href="errata31.html#kpr">March 19, 2003:
1.241 jufi 518: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 519: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.294 david 520: <li><a href="errata31.html#blinding">March 18, 2003:
1.239 miod 521: Various SSL and TLS operations in OpenSSL are vulnerable to
522: timing attacks.</a>
1.294 david 523: <li><a href="errata31.html#lprm">March 4, 2003:
1.238 millert 524: A buffer overflow in lprm(1) may allow an attacker to gain
525: root privileges.</a>
1.294 david 526: <li><a href="errata31.html#sendmail">March 3, 2003:
1.237 miod 527: A buffer overflow in the envelope comments processing in
528: sendmail(8) may allow an attacker to gain root privileges.</a>
1.294 david 529: <li><a href="errata31.html#ssl2">February 23, 2003:
1.235 miod 530: In ssl(8) an information leak can occur via timing by performing
531: a MAC computation even if incorrect block cipher padding has
532: been found, this is a countermeasure. Also, check for negative
533: sizes, in allocation routines.</a>
1.294 david 534: <li><a href="errata31.html#cvs">January 20, 2003:
1.232 millert 535: A double free exists in cvs(1) that could lead to privilege
536: escalation for cvs configurations where the cvs command is
1.294 david 537: run as a privileged user</a>.
538: <li><a href="errata31.html#named">November 14, 2002:
1.230 millert 539: A buffer overflow exists in named(8) that could lead to a
540: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 541: <li><a href="errata31.html#kernresource">November 6, 2002:
1.229 miod 542: Incorrect argument checking in the getitimer(2) system call
543: may allow an attacker to crash the system.</a>
1.294 david 544: <li><a href="errata31.html#smrsh">November 6, 2002:
1.229 miod 545: An attacker can bypass smrsh(8)'s restrictions and execute
546: arbitrary commands with the privileges of his own account.</a>
1.294 david 547: <li><a href="errata31.html#kadmin">October 21, 2002:
1.226 miod 548: A buffer overflow can occur in the kadmind(8) daemon, leading
549: to possible remote crash or exploit.</a>
1.294 david 550: <li><a href="errata31.html#kerntime">October 2, 2002:
1.222 jason 551: Incorrect argument checking in the setitimer(2) system call
552: may allow an attacker to write to kernel memory.</a>
1.294 david 553: <li><a href="errata31.html#scarg">August 11, 2002:
1.221 provos 554: An insufficient boundary check in the select system call
1.220 miod 555: allows an attacker to overwrite kernel memory and execute arbitrary code
556: in kernel context.</a>
1.294 david 557: <li><a href="errata31.html#ssl">July 30, 2002:
1.218 miod 558: Several remote buffer overflows can occur in the SSL2 server and SSL3
559: client of the ssl(8) library, as in the ASN.1 parser code in the
560: crypto(3) library, all of them being potentially remotely
561: exploitable.</a>
1.294 david 562: <li><a href="errata31.html#xdr">July 29, 2002:
1.218 miod 563: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
564: possible remote crash.</a>
1.294 david 565: <li><a href="errata31.html#pppd">July 29, 2002:
1.218 miod 566: A race condition exists in the pppd(8) daemon which may cause it to
567: alter the file permissions of an arbitrary file.</a>
1.294 david 568: <li><a href="errata31.html#isakmpd">July 5, 2002:
1.218 miod 569: Receiving IKE payloads out of sequence can cause isakmpd(8) to
570: crash.</a>
1.294 david 571: <li><a href="errata31.html#ktrace">June 27, 2002:
1.215 miod 572: The kernel would let any user ktrace set[ug]id processes.</a>
1.294 david 573: <li><a href="errata31.html#modssl">June 26, 2002:
1.213 miod 574: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 575: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.294 david 576: <li><a href="errata31.html#resolver">June 25, 2002:
1.212 millert 577: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 578: <li><a href="errata31.html#sshd">June 24, 2002:
1.216 deraadt 579: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 580: input validation error that can result in an integer overflow and
581: privilege escalation.</a>
1.294 david 582: <li><a href="errata31.html#httpd">June 19, 2002:
1.211 miod 583: A buffer overflow can occur during the interpretation of chunked
584: encoding in httpd(8), leading to possible remote crash.</a>
1.294 david 585: <li><a href="errata31.html#sshbsdauth">May 22, 2002:
1.209 markus 586: Under certain conditions, on systems using YP with netgroups
587: in the password database, it is possible that sshd(8) does
588: ACL checks for the requested user name but uses the password
589: database entry of a different user for authentication. This
590: means that denied users might authenticate successfully
591: while permitted users could be locked out.</a>
1.294 david 592: <li><a href="errata31.html#fdalloc2">May 8, 2002:
1.208 millert 593: A race condition exists that could defeat the kernel's
594: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 595: <li><a href="errata31.html#sudo">April 25, 2002:
1.205 millert 596: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 597: <li><a href="errata31.html#sshafs">April 22, 2002:
1.205 millert 598: A local user can gain super-user privileges due to a buffer
599: overflow in sshd(8) if AFS has been configured on the system
600: or if KerberosTgtPassing or AFSTokenPassing has been enabled
601: in the sshd_config file.</a>
1.203 deraadt 602: </ul>
603:
1.235 miod 604: <p>
1.203 deraadt 605: <li>
1.288 matthieu 606: <a name="30"></a>
1.187 deraadt 607:
1.294 david 608: <h3><font color="#e00000">OpenBSD 3.0 Security Advisories</font></h3>
1.187 deraadt 609: These are the OpenBSD 3.0 advisories -- all these problems are solved
1.294 david 610: in <a href="anoncvs.html">OpenBSD current</a>. The
611: <a href="stable.html">patch branch</a> for 3.0 is no longer being maintained,
1.258 beck 612: you should update your machine.
1.187 deraadt 613:
614: <p>
615: <ul>
1.294 david 616: <li><a href="errata30.html#named">November 14, 2002:
1.230 millert 617: A buffer overflow exists in named(8) that could lead to a
618: remote crash or code execution as user named in a chroot jail.</a>
1.294 david 619: <li><a href="errata30.html#kernresource">November 6, 2002:
1.229 miod 620: Incorrect argument checking in the getitimer(2) system call
621: may allow an attacker to crash the system.</a>
1.294 david 622: <li><a href="errata30.html#smrsh">November 6, 2002:
1.229 miod 623: An attacker can bypass smrsh(8)'s restrictions and execute
624: arbitrary commands with the privileges of his own account.</a>
1.294 david 625: <li><a href="errata30.html#kadmin">October 21, 2002:
1.226 miod 626: A buffer overflow can occur in the kadmind(8) daemon, leading
627: to possible remote crash or exploit.</a>
1.294 david 628: <li><a href="errata30.html#kerntime">October 7, 2002:
1.223 miod 629: Incorrect argument checking in the setitimer(2) system call
630: may allow an attacker to write to kernel memory.</a>
1.294 david 631: <li><a href="errata30.html#scarg">August 11, 2002:
1.220 miod 632: An insufficient boundary check in the select and poll system calls
633: allows an attacker to overwrite kernel memory and execute arbitrary code
634: in kernel context.</a>
1.294 david 635: <li><a href="errata30.html#ssl">July 30, 2002:
1.218 miod 636: Several remote buffer overflows can occur in the SSL2 server and SSL3
637: client of the ssl(8) library, as in the ASN.1 parser code in the
638: crypto(3) library, all of them being potentially remotely
639: exploitable.</a>
1.294 david 640: <li><a href="errata30.html#xdr">July 29, 2002:
1.218 miod 641: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
642: possible remote crash.</a>
1.294 david 643: <li><a href="errata30.html#pppd">July 29, 2002:
1.218 miod 644: A race condition exists in the pppd(8) daemon which may cause it to
645: alter the file permissions of an arbitrary file.</a>
1.294 david 646: <li><a href="errata30.html#isakmpd2">July 5, 2002:
1.218 miod 647: Receiving IKE payloads out of sequence can cause isakmpd(8) to
648: crash.</a>
1.294 david 649: <li><a href="errata30.html#ktrace">June 27, 2002:
1.215 miod 650: The kernel would let any user ktrace set[ug]id processes.</a>
1.294 david 651: <li><a href="errata30.html#resolver">June 25, 2002:
1.212 millert 652: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 653: <li><a href="errata30.html#sshdauth">June 24, 2002:
1.216 deraadt 654: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 655: input validation error that can result in an integer overflow and
656: privilege escalation.</a>
1.294 david 657: <li><a href="errata30.html#modssl">June 24, 2002:
1.213 miod 658: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 659: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.294 david 660: <li><a href="errata30.html#httpd">June 19, 2002:
1.213 miod 661: A buffer overflow can occur during the interpretation of chunked
662: encoding in httpd(8), leading to possible remote crash.</a>
1.294 david 663: <li><a href="errata30.html#fdalloc2">May 8, 2002:
1.208 millert 664: A race condition exists that could defeat the kernel's
665: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 666: <li><a href="errata30.html#sudo2">April 25, 2002:
1.205 millert 667: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 668: <li><a href="errata30.html#sshafs">April 22, 2002:
1.205 millert 669: A local user can gain super-user privileges due to a buffer
670: overflow in sshd(8) if AFS has been configured on the system
671: or if KerberosTgtPassing or AFSTokenPassing has been enabled
672: in the sshd_config file.</a>
1.294 david 673: <li><a href="errata30.html#mail">April 11, 2002:
1.202 millert 674: The mail(1) was interpreting tilde escapes even when invoked
675: in non-interactive mode. As mail(1) is called as root from cron,
676: this can lead to a local root compromise.</a>
1.294 david 677: <li><a href="errata30.html#approval">March 19, 2002:
1.201 millert 678: Under certain conditions, on systems using YP with netgroups in
679: the password database, it is possible for the rexecd(8) and rshd(8)
680: daemons to execute a shell from a password database entry for a
681: different user. Similarly, atrun(8) may change to the wrong
682: home directory when running jobs.</a>
1.294 david 683: <li><a href="errata30.html#zlib">March 13, 2002:
1.200 millert 684: A potential double free() exists in the zlib library;
685: this is not exploitable on OpenBSD.
686: The kernel also contains a copy of zlib; it is not
687: currently known if the kernel zlib is exploitable.</a>
1.294 david 688: <li><a href="errata30.html#openssh">March 8, 2002:
1.198 millert 689: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 690: may allow a local user to gain super-user privileges.</a>
1.294 david 691: <li><a href="errata30.html#ptrace">January 21, 2002:
1.192 jason 692: A race condition between the ptrace(2) and execve(2) system calls
693: allows an attacker to modify the memory contents of suid/sgid
694: processes which could lead to compromise of the super-user account.</a>
1.294 david 695: <li><a href="errata30.html#sudo">January 17, 2002:
1.191 millert 696: There is a security hole in sudo(8) that can be exploited
697: when the Postfix sendmail replacement is installed that may
698: allow an attacker on the local host to gain root privileges.</a>
1.294 david 699: <li><a href="errata30.html#lpd">November 28, 2001:
1.189 millert 700: An attacker can trick a machine running the lpd daemon into
701: creating new files in the root directory from a machine with
702: remote line printer access.</a>
1.294 david 703: <li><a href="errata30.html#vi.recover">November 13, 2001:
1.188 millert 704: The vi.recover script can be abused in such a way as
705: to cause arbitrary zero-length files to be removed.</a>
1.294 david 706: <li><a href="errata30.html#pf">November 13, 2001:
1.190 mpech 707: pf(4) was incapable of dealing with certain ipv6 icmp packets,
708: resulting in a crash.</a>
1.294 david 709: <li><a href="errata30.html#sshd">November 12, 2001:
1.190 mpech 710: A security hole that may allow an attacker to partially authenticate
711: if -- and only if -- the administrator has enabled KerberosV.</a>
1.187 deraadt 712: </ul>
713:
714: <p>
715: <li>
1.288 matthieu 716: <a name="29"></a>
1.173 deraadt 717:
1.294 david 718: <h3><font color="#e00000">OpenBSD 2.9 Security Advisories</font></h3>
1.173 deraadt 719: These are the OpenBSD 2.9 advisories -- all these problems are solved
1.294 david 720: in <a href="anoncvs.html">OpenBSD current</a>. The
721: <a href="stable.html">patch branch</a>. for 2.9 is no longer being maintained,
1.258 beck 722: you should update your machine.
723:
1.173 deraadt 724:
725: <p>
726: <ul>
1.294 david 727: <li><a href="errata29.html#resolver">June 25, 2002:
1.212 millert 728: A potential buffer overflow in the DNS resolver has been found.</a>
1.294 david 729: <li><a href="errata29.html#fdalloc2">May 8, 2002:
1.208 millert 730: A race condition exists that could defeat the kernel's
731: protection of fd slots 0-2 for setuid processes.</a>
1.294 david 732: <li><a href="errata29.html#sudo2">April 25, 2002:
1.207 millert 733: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.294 david 734: <li><a href="errata29.html#sshafs">April 22, 2002:
1.206 millert 735: A local user can gain super-user privileges due to a buffer
736: overflow in sshd(8) if AFS has been configured on the system
737: or if KerberosTgtPassing or AFSTokenPassing has been enabled
738: in the sshd_config file.</a>
1.294 david 739: <li><a href="errata29.html#mail">April 11, 2002:
1.202 millert 740: The mail(1) was interpreting tilde escapes even when invoked
741: in non-interactive mode. As mail(1) is called as root from cron,
742: this can lead to a local root compromise.</a>
1.294 david 743: <li><a href="errata29.html#zlib">March 13, 2002:
1.200 millert 744: A potential double free() exists in the zlib library;
745: this is not exploitable on OpenBSD.
746: The kernel also contains a copy of zlib; it is not
747: currently known if the kernel zlib is exploitable.</a>
1.294 david 748: <li><a href="errata29.html#openssh">March 8, 2002:
1.198 millert 749: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 750: may allow a local user to gain super-user privileges.</a>
1.294 david 751: <li><a href="errata29.html#ptrace">January 21, 2002:
1.198 millert 752: A race condition between the ptrace(2) and execve(2) system calls
753: allows an attacker to modify the memory contents of suid/sgid
754: processes which could lead to compromise of the super-user account.</a>
1.294 david 755: <li><a href="errata29.html#sudo">January 17, 2002:
1.191 millert 756: There is a security hole in sudo(8) that can be exploited
757: when the Postfix sendmail replacement is installed that may
758: allow an attacker on the local host to gain root privileges.</a>
1.294 david 759: <li><a href="errata29.html#lpd2">November 28, 2001:
1.189 millert 760: An attacker can trick a machine running the lpd daemon into
761: creating new files in the root directory from a machine with
762: remote line printer access.</a>
1.294 david 763: <li><a href="errata29.html#vi.recover">November 13, 2001:
1.190 mpech 764: The vi.recover script can be abused in such a way as
765: to cause arbitrary zero-length files to be removed.</a>
1.294 david 766: <li><a href="errata29.html#uucp">September 11, 2001:
1.184 millert 767: A security hole exists in uuxqt(8) that may allow an
768: attacker to gain root privileges.</a>
1.294 david 769: <li><a href="errata29.html#lpd">August 29, 2001:
1.183 millert 770: A security hole exists in lpd(8) that may allow an
771: attacker to gain root privileges if lpd is running.</a>
1.294 david 772: <li><a href="errata29.html#sendmail2">August 21, 2001:
1.181 millert 773: A security hole exists in sendmail(8) that may allow an
774: attacker on the local host to gain root privileges.</a>
1.294 david 775: <li><a href="errata29.html#nfs">July 30, 2001:
1.180 jason 776: A kernel buffer overflow in the NFS code can be used to execute
777: arbitrary code by users with mount privileges (only root by
1.181 millert 778: default).</a>
1.294 david 779: <li><a href="errata29.html#kernexec">June 15, 2001:
1.178 aaron 780: A race condition in the kernel can lead to local root compromise.</a>
1.294 david 781: <li><a href="errata29.html#sshcookie">June 12, 2001:
1.177 markus 782: sshd(8) allows users to delete arbitrary files named "cookies"
783: if X11 forwarding is enabled. X11 forwarding is disabled
784: by default.</a>
1.294 david 785: <li><a href="errata29.html#fts">May 30, 2001:
1.176 millert 786: Programs using the fts routines can be tricked into changing
787: into the wrong directory.</a>
1.294 david 788: <li><a href="errata29.html#sendmail">May 29, 2001:
1.174 millert 789: Sendmail signal handlers contain unsafe code,
790: leading to numerous race conditions.</a>
1.173 deraadt 791: </ul>
792:
793: <p>
794: <li>
1.288 matthieu 795: <a name="28"></a>
1.152 deraadt 796:
1.294 david 797: <h3><font color="#e00000">OpenBSD 2.8 Security Advisories</font></h3>
1.152 deraadt 798: These are the OpenBSD 2.8 advisories -- all these problems are solved
1.294 david 799: in <a href="anoncvs.html">OpenBSD current</a>. The
800: <a href="stable.html">patch branch</a>. for 2.8 is no longer being maintained,
1.258 beck 801: you should update your machine.
802:
1.152 deraadt 803:
804: <p>
805: <ul>
1.294 david 806: <li><a href="errata28.html#uucp">September 11, 2001:
1.184 millert 807: A security hole exists in uuxqt(8) that may allow an
808: attacker to gain root privileges.</a>
1.294 david 809: <li><a href="errata28.html#lpd">August 29, 2001:
1.183 millert 810: A security hole exists in lpd(8) that may allow an
811: attacker to gain root privileges if lpd is running.</a>
1.294 david 812: <li><a href="errata28.html#sendmail2">August 21, 2001:
1.181 millert 813: A security hole exists in sendmail(8) that may allow an
814: attacker on the local host to gain root privileges.</a>
1.294 david 815: <li><a href="errata28.html#kernexec">June 15, 2001:
1.178 aaron 816: A race condition in the kernel can lead to local root compromise.</a>
1.294 david 817: <li><a href="errata28.html#fts">May 30, 2001:
1.176 millert 818: Programs using the fts routines can be tricked into changing
819: into the wrong directory.</a>
1.294 david 820: <li><a href="errata28.html#sendmail">May 29, 2001:
1.175 millert 821: Sendmail signal handlers contain unsafe code,
822: leading to numerous race conditions.</a>
1.294 david 823: <li><a href="errata28.html#ipf_frag">Apr 23, 2001:
1.231 mickey 824: IPF contains a serious bug with its handling of fragment caching.</a>
1.294 david 825: <li><a href="errata28.html#glob_limit">Apr 23, 2001:
1.172 ericj 826: ftpd(8) contains a potential DoS relating to glob(3).</a>
1.294 david 827: <li><a href="errata28.html#glob">Apr 10, 2001:
1.170 ericj 828: The glob(3) library call contains multiple buffer overflows.</a>
1.294 david 829: <li><a href="errata28.html#readline">Mar 18, 2001:
1.169 millert 830: The readline library creates history files with permissive modes based on the user's umask.</a>
1.294 david 831: <li><a href="errata28.html#ipsec_ah">Mar 2, 2001:
1.167 ericj 832: Insufficient checks in the IPSEC AH IPv4 option handling code can lead to a buffer overrun in the kernel.</a>
1.294 david 833: <li><a href="errata28.html#userldt">Mar 2, 2001:
1.168 horacio 834: The <b>USER_LDT</b> kernel option allows an attacker to gain access to privileged areas of kernel memory.</a>
1.294 david 835: <li><a href="errata28.html#sudo">Feb 22, 2001:
1.171 millert 836: a non-exploitable buffer overflow was fixed in sudo(8).</a>
1.294 david 837: <li><a href="errata28.html#named">Jan 29, 2001:
1.163 jason 838: merge named(8) with ISC BIND 4.9.8-REL, which fixes some buffer vulnerabilities.</a>
1.294 david 839: <li><a href="errata28.html#rnd">Jan 22, 2001:
1.162 jason 840: rnd(4) did not use all of its input when written to.</a>
1.294 david 841: <li><a href="errata28.html#xlock">Dec 22, 2000:
1.159 ericj 842: xlock(1)'s authentication was re-done to authenticate via a named pipe. (patch and new xlock binaries included).</a>
1.294 david 843: <li><a href="errata28.html#procfs">Dec 18, 2000:
1.157 ericj 844: Procfs contains numerous overflows. Procfs is not used by default in OpenBSD. (patch included).</a>
1.294 david 845: <li><a href="errata28.html#kerberos2">Dec 10, 2000:
1.156 deraadt 846: Another problem exists in KerberosIV libraries (patch included).</a>
1.294 david 847: <li><a href="errata28.html#kerberos">Dec 7, 2000:
1.155 deraadt 848: A set of problems in KerberosIV exist (patch included).</a>
1.294 david 849: <li><a href="errata28.html#ftpd">Dec 4, 2000:
1.154 millert 850: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.152 deraadt 851: </ul>
852:
853: <p>
854: <li>
1.288 matthieu 855: <a name="27"></a>
1.124 deraadt 856:
1.294 david 857: <h3><font color="#e00000">OpenBSD 2.7 Security Advisories</font></h3>
1.124 deraadt 858: These are the OpenBSD 2.7 advisories -- all these problems are solved
1.294 david 859: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.124 deraadt 860: OpenBSD 2.6 advisories listed below are fixed in OpenBSD 2.7.
861:
862: <p>
863: <ul>
1.294 david 864: <li><a href="errata27.html#readline">Mar 18, 2001:
1.169 millert 865: The readline library creates history files with permissive modes based on the user's umask.</a>
1.294 david 866: <li><a href="errata27.html#sudo">Feb 22, 2001:
1.169 millert 867: a buffer overflow was fixed in sudo(8).</a>
1.294 david 868: <li><a href="errata27.html#ftpd">Dec 4, 2000:
1.154 millert 869: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.294 david 870: <li><a href="errata27.html#sshforwarding">Nov 10, 2000:
1.152 deraadt 871: Hostile servers can force OpenSSH clients to do agent or X11 forwarding.
872: (patch included)</a>
1.294 david 873: <li><a href="errata27.html#xtrans">Oct 26, 2000:
1.151 matthieu 874: X11 libraries have 2 potential overflows in xtrans code.
875: (patch included)</a>
1.294 david 876: <li><a href="errata27.html#httpd">Oct 18, 2000:
1.150 beck 877: Apache mod_rewrite and mod_vhost_alias modules could expose files
878: on the server in certain configurations if used.
879: (patch included)</a>
1.294 david 880: <li><a href="errata27.html#telnetd">Oct 10, 2000:
1.149 millert 881: The telnet daemon does not strip out the TERMINFO, TERMINFO_DIRS,
882: TERMPATH and TERMCAP environment variables as it should.
883: (patch included)</a>
1.294 david 884: <li><a href="errata27.html#format_strings">Oct 6, 2000:
1.148 millert 885: There are printf-style format string bugs in several privileged
886: programs. (patch included)</a>
1.294 david 887: <li><a href="errata27.html#curses">Oct 6, 2000:
1.147 millert 888: libcurses honored terminal descriptions in the $HOME/.terminfo
889: directory as well as in the TERMCAP environment variable for
890: setuid and setgid applications.
1.146 deraadt 891: (patch included)</a>
1.294 david 892: <li><a href="errata27.html#talkd">Oct 6, 2000:
1.146 deraadt 893: A format string vulnerability exists in talkd(8).
894: (patch included)</a>
1.294 david 895: <li><a href="errata27.html#pw_error">Oct 3, 2000:
1.145 aaron 896: A format string vulnerability exists in the pw_error() function of the
897: libutil library, yielding localhost root through chpass(1).
898: (patch included)</a>
1.294 david 899: <li><a href="errata27.html#ipsec">Sep 18, 2000:
1.144 jason 900: Bad ESP/AH packets could cause a crash under certain conditions.
901: (patch included)</a>
1.294 david 902: <li><a href="errata27.html#xlock">Aug 16, 2000:
1.141 deraadt 903: A format string vulnerability (localhost root) exists in xlock(1).
904: (patch included)</a>
1.294 david 905: <li><a href="errata27.html#X11_libs">July 14, 2000:
1.139 deraadt 906: Various bugs found in X11 libraries have various side effects, almost
907: completely denial of service in OpenBSD.
908: (patch included)</a>
1.294 david 909: <li><a href="errata27.html#ftpd">July 5, 2000:
1.136 deraadt 910: Just like pretty much all the other unix ftp daemons
911: on the planet, ftpd had a remote root hole in it.
912: Luckily, ftpd was not enabled by default.
1.137 deraadt 913: The problem exists if anonymous ftp is enabled.
1.136 deraadt 914: (patch included)</a>
1.294 david 915: <li><a href="errata27.html#mopd">July 5, 2000:
1.136 deraadt 916: Mopd, very rarely used, contained some buffer overflows.
917: (patch included)</a>
1.294 david 918: <li><a href="errata27.html#libedit">June 28, 2000:
1.135 deraadt 919: libedit would check for a <b>.editrc</b> file in the current
920: directory. Not known to be a real security issue, but a patch
921: is available anyways.
922: (patch included)</a>
1.294 david 923: <li><a href="errata27.html#dhclient">June 24, 2000:
1.134 deraadt 924: A serious bug in dhclient(8) could allow strings from a
925: malicious dhcp server to be executed in the shell as root.
926: (patch included)</a>
1.294 david 927: <li><a href="errata27.html#isakmpd">June 9, 2000:
1.133 deraadt 928: A serious bug in isakmpd(8) policy handling wherein
929: policy verification could be completely bypassed in isakmpd.
930: (patch included)</a>
1.294 david 931: <li><a href="errata27.html#uselogin">June 6, 2000:
1.132 deraadt 932: The non-default flag UseLogin in <b>/etc/sshd_config</b> is broken,
933: should not be used, and results in security problems on
934: other operating systems.</a>
1.294 david 935: <li><a href="errata27.html#bridge">May 26, 2000:
1.129 deraadt 936: The bridge(4) <i>learning</i> flag may be bypassed.
1.128 deraadt 937: (patch included)</a>
1.294 david 938: <li><a href="errata27.html#ipf">May 25, 2000:
1.127 kjell 939: Improper use of ipf <i>keep-state</i> rules can result
940: in firewall rules being bypassed. (patch included)</a>
941:
1.124 deraadt 942: </ul>
943:
944: <p>
945: <li>
1.288 matthieu 946: <a name="26"></a>
1.119 deraadt 947:
1.294 david 948: <h3><font color="#e00000">OpenBSD 2.6 Security Advisories</font></h3>
1.119 deraadt 949: These are the OpenBSD 2.6 advisories -- all these problems are solved
1.294 david 950: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.119 deraadt 951: OpenBSD 2.5 advisories listed below are fixed in OpenBSD 2.6.
952:
953: <p>
954: <ul>
1.294 david 955: <li><a href="errata26.html#semconfig">May 26, 2000:
1.130 deraadt 956: SYSV semaphore support contained an undocumented system call
1.131 deraadt 957: which could wedge semaphore-using processes from exiting. (patch included)</a>
1.294 david 958: <li><a href="errata26.html#ipf">May 25, 2000:
1.127 kjell 959: Improper use of ipf <i>keep-state</i> rules can result
960: in firewall rules being bypassed. (patch included)</a>
1.294 david 961: <li><a href="errata26.html#xlockmore">May 25, 2000:
1.125 deraadt 962: xlockmore has a bug which a localhost attacker can use to gain
963: access to the encrypted root password hash (which is normally
1.245 miod 964: encoded using blowfish</a> (see
1.294 david 965: <a href="http://www.openbsd.org/cgi-bin/man.cgi?query=crypt&sektion=3">
1.125 deraadt 966: crypt(3)</a>)
1.245 miod 967: (patch included).
1.294 david 968: <li><a href="errata26.html#procfs">Jan 20, 2000:
1.123 deraadt 969: Systems running with procfs enabled and mounted are
970: vulnerable to a very tricky exploit. procfs is not
971: mounted by default.
972: (patch included).</a>
1.294 david 973: <li><a href="errata26.html#sendmail">Dec 4, 1999:
1.296 david 974: Sendmail permitted any user to cause an aliases file wrap,
1.190 mpech 975: thus exposing the system to a race where the aliases file
976: did not exist.
1.119 deraadt 977: (patch included).</a>
1.294 david 978: <li><a href="errata26.html#poll">Dec 4, 1999:
1.190 mpech 979: Various bugs in poll(2) may cause a kernel crash.</a>
1.294 david 980: <li><a href="errata26.html#sslUSA">Dec 2, 1999:
1.120 deraadt 981: A buffer overflow in the RSAREF code included in the
982: USA version of libssl, is possibly exploitable in
983: httpd, ssh, or isakmpd, if SSL/RSA features are enabled.
1.124 deraadt 984: (patch included).<br></a>
985: <strong>Update:</strong> Turns out that this was not exploitable
986: in any of the software included in OpenBSD 2.6.
1.294 david 987: <li><a href="errata26.html#ifmedia">Nov 9, 1999:
1.190 mpech 988: Any user could change interface media configurations, resulting in
989: a localhost denial of service attack.
1.121 deraadt 990: (patch included).</a>
1.119 deraadt 991: </ul>
992:
993: <p>
994: <li>
1.288 matthieu 995: <a name="25"></a>
1.106 deraadt 996:
1.294 david 997: <h3><font color="#e00000">OpenBSD 2.5 Security Advisories</font></h3>
1.93 deraadt 998: These are the OpenBSD 2.5 advisories -- all these problems are solved
1.294 david 999: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.93 deraadt 1000: OpenBSD 2.4 advisories listed below are fixed in OpenBSD 2.5.
1001:
1.96 deraadt 1002: <p>
1.104 deraadt 1003: <ul>
1.294 david 1004: <li><a href="errata25.html#cron">Aug 30, 1999:
1.103 deraadt 1005: In cron(8), make sure argv[] is NULL terminated in the
1006: fake popen() and run sendmail as the user, not as root.
1007: (patch included).</a>
1.294 david 1008: <li><a href="errata25.html#miscfs">Aug 12, 1999: The procfs and fdescfs
1.101 deraadt 1009: filesystems had an overrun in their handling of uio_offset
1010: in their readdir() routines. (These filesystems are not
1011: enabled by default). (patch included).</a>
1.294 david 1012: <li><a href="errata25.html#profil">Aug 9, 1999: Stop profiling (see profil(2))
1.100 deraadt 1013: when we execve() a new process. (patch included).</a>
1.294 david 1014: <li><a href="errata25.html#ipsec_in_use">Aug 6, 1999: Packets that should have
1.98 deraadt 1015: been handled by IPsec may be transmitted as cleartext.
1016: PF_KEY SA expirations may leak kernel resources.
1017: (patch included).</a>
1.294 david 1018: <li><a href="errata25.html#rc">Aug 5, 1999: In /etc/rc, use mktemp(1) for
1.97 deraadt 1019: motd re-writing and change the find(1) to use -execdir
1020: (patch included).</a>
1.294 david 1021: <li><a href="errata25.html#chflags">Jul 30, 1999: Do not permit regular
1.95 deraadt 1022: users to chflags(2) or fchflags(2) on character or block devices
1023: which they may currently be the owner of (patch included).</a>
1.294 david 1024: <li><a href="errata25.html#nroff">Jul 27, 1999: Cause groff(1) to be invoked
1.95 deraadt 1025: with the -S flag, when called by nroff(1) (patch included).</a>
1.93 deraadt 1026: </ul>
1027:
1.106 deraadt 1028: <p>
1029: <li>
1.288 matthieu 1030: <a name="24"></a>
1.235 miod 1031:
1.294 david 1032: <h3><font color="#e00000">OpenBSD 2.4 Security Advisories</font></h3>
1.75 deraadt 1033: These are the OpenBSD 2.4 advisories -- all these problems are solved
1.294 david 1034: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.75 deraadt 1035: OpenBSD 2.3 advisories listed below are fixed in OpenBSD 2.4.
1036:
1.96 deraadt 1037: <p>
1.75 deraadt 1038: <ul>
1.294 david 1039: <li><a href="errata24.html#poll">Mar 22, 1999: The nfds argument for poll(2) needs
1.91 deraadt 1040: to be constrained, to avoid kvm starvation (patch included).</a>
1.294 david 1041: <li><a href="errata24.html#tss">Mar 21, 1999: A change in TSS handling stops
1.91 deraadt 1042: another kernel crash case caused by the <strong>crashme</strong>
1043: program (patch included).</a>
1.294 david 1044: <li><a href="errata24.html#nlink">Feb 25, 1999: An unbounded increment on the
1.90 deraadt 1045: nlink value in FFS and EXT2FS filesystems can cause a system crash.
1.89 deraadt 1046: (patch included).</a>
1.294 david 1047: <li><a href="errata24.html#ping">Feb 23, 1999: Yet another buffer overflow
1.88 deraadt 1048: existed in ping(8). (patch included).</a>
1.294 david 1049: <li><a href="errata24.html#ipqrace">Feb 19, 1999: ipintr() had a race in use of
1.87 deraadt 1050: the ipq, which could permit an attacker to cause a crash.
1051: (patch included).</a>
1.294 david 1052: <li><a href="errata24.html#accept">Feb 17, 1999: A race condition in the
1.86 deraadt 1053: kernel between accept(2) and select(2) could permit an attacker
1054: to hang sockets from remote.
1055: (patch included).</a>
1.294 david 1056: <li><a href="errata24.html#maxqueue">Feb 17, 1999: IP fragment assembly can
1.85 deraadt 1057: bog the machine excessively and cause problems.
1058: (patch included).</a>
1.294 david 1059: <li><a href="errata24.html#trctrap">Feb 12, 1999: i386 T_TRCTRAP handling and
1.84 deraadt 1060: DDB interacted to possibly cause a crash.
1061: (patch included).</a>
1.294 david 1062: <li><a href="errata24.html#rst">Feb 11, 1999: TCP/IP RST handling was sloppy.
1.83 deraadt 1063: (patch included).</a>
1.294 david 1064: <li><a href="errata24.html#bootpd">Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 1065: problem in bootpd(8). (patch included).</a>
1.294 david 1066: <li><a href="errata24.html#termcap">Nov 19, 1998: There is a possibly locally
1.82 deraadt 1067: exploitable problem relating to environment variables in termcap
1068: and curses. (patch included).</a>
1.294 david 1069: <li><a href="errata24.html#tcpfix">Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 1070: bug in the TCP decoding kernel. (patch included).</a>
1.75 deraadt 1071: </ul>
1072:
1.106 deraadt 1073: <p>
1074: <li>
1.288 matthieu 1075: <a name="23"></a>
1.235 miod 1076:
1.294 david 1077: <h3><font color="#e00000">OpenBSD 2.3 Security Advisories</font></h3>
1.73 deraadt 1078: These are the OpenBSD 2.3 advisories -- all these problems are solved
1.294 david 1079: in <a href="anoncvs.html">OpenBSD current</a>. Obviously, all the
1.73 deraadt 1080: OpenBSD 2.2 advisories listed below are fixed in OpenBSD 2.3.
1.53 matthieu 1081:
1.96 deraadt 1082: <p>
1.53 matthieu 1083: <ul>
1.294 david 1084: <li><a href="errata23.html#bootpd">Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 1085: problem in bootpd(8). (patch included).</a>
1.294 david 1086: <li><a href="errata23.html#tcpfix">Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 1087: bug in the TCP decoding kernel. (patch included).</a>
1.294 david 1088: <li><a href="errata23.html#resolver">August 31, 1998: A benign looking resolver
1.190 mpech 1089: buffer overflow bug was re-introduced accidentally (patches included).</a>
1.294 david 1090: <li><a href="errata23.html#chpass">Aug 2, 1998:
1.190 mpech 1091: chpass(1) has a file descriptor leak which allows an
1092: attacker to modify /etc/master.passwd.</a>
1.294 david 1093: <li><a href="errata23.html#inetd">July 15, 1998: Inetd had a file descriptor leak.</a>
1094: <li><a href="errata23.html#fdalloc">Jul 2, 1998: setuid and setgid processes
1.72 deraadt 1095: should not be executed with fd slots 0, 1, or 2 free.
1096: (patch included).</a>
1.294 david 1097: <li><a href="errata23.html#xlib">June 6, 1998: Further problems with the X
1.71 deraadt 1098: libraries (patches included).</a>
1.294 david 1099: <li><a href="errata23.html#kill">May 17, 1998: kill(2) of setuid/setgid target
1.66 deraadt 1100: processes too permissive (4th revision patch included).</a>
1.294 david 1101: <li><a href="errata23.html#immutable">May 11, 1998: mmap() permits partial bypassing
1.60 deraadt 1102: of immutable and append-only file flags. (patch included).</a>
1.294 david 1103: <li><a href="errata23.html#ipsec">May 5, 1998: Incorrect handling of IPSEC packets
1.190 mpech 1104: if IPSEC is enabled (patch included).</a>
1.294 david 1105: <li><a href="errata23.html#xterm-xaw">May 1, 1998: Buffer overflow in xterm and Xaw
1.58 deraadt 1106: (CERT advisory VB-98.04) (patch included).</a>
1.53 matthieu 1107: </ul>
1.9 deraadt 1108:
1.106 deraadt 1109: <p>
1110: <li>
1.288 matthieu 1111: <a name="22"></a>
1.235 miod 1112:
1.294 david 1113: <h3><font color="#e00000">OpenBSD 2.2 Security Advisories</font></h3>
1.45 deraadt 1114: These are the OpenBSD 2.2 advisories. All these problems are solved
1.294 david 1115: in <a href="23.html">OpenBSD 2.3</a>. Some of these problems
1.45 deraadt 1116: still exist in other operating systems. (The supplied patches are for
1117: OpenBSD 2.2; they may or may not work on OpenBSD 2.1).
1.9 deraadt 1118:
1.96 deraadt 1119: <p>
1.9 deraadt 1120: <ul>
1.294 david 1121: <li><a href="errata22.html#ipsec">May 5, 1998: Incorrect handling of IPSEC
1.72 deraadt 1122: packets if IPSEC is enabled (patch included).</a>
1.294 david 1123: <li><a href="errata22.html#xterm-xaw">May 1, 1998: Buffer overflow in xterm
1.72 deraadt 1124: and Xaw (CERT advisory VB-98.04) (patch included).</a>
1.294 david 1125: <li><a href="errata22.html#uucpd">Apr 22, 1998: Buffer overflow in uucpd
1.72 deraadt 1126: (patch included).</a>
1.294 david 1127: <li><a href="errata22.html#rmjob">Apr 22, 1998: Buffer mismanagement in lprm
1.72 deraadt 1128: (patch included).</a>
1.294 david 1129: <li><a href="errata22.html#ping">Mar 31, 1998: Overflow in ping -R (patch included).</a>
1130: <li><a href="errata22.html#named">Mar 30, 1998: Overflow in named fake-iquery
1.59 deraadt 1131: (patch included).</a>
1.294 david 1132: <li><a href="errata22.html#mountd">Mar 2, 1998: Accidental NFS filesystem
1.72 deraadt 1133: export (patch included).</a>
1.112 philen 1134: <li><a href="advisories/mmap.txt">Feb 26, 1998: Read-write mmap() flaw.</a>
1.294 david 1135: Revision 3 of the patch is available <a href="errata22.html#mmap">here</a>
1.112 philen 1136: <li><a href="advisories/sourceroute.txt">Feb 19, 1998: Sourcerouted Packet
1.59 deraadt 1137: Acceptance.</a>
1.294 david 1138: A patch is available <a href="errata22.html#sourceroute">here</a>.
1139: <li><a href="errata22.html#ruserok">Feb 13, 1998: Setuid coredump & Ruserok()
1.72 deraadt 1140: flaw (patch included).</a>
1.294 david 1141: <li><a href="errata22.html#ldso">Feb 9, 1998: MIPS ld.so flaw (patch included).</a>
1.1 deraadt 1142: </ul>
1143:
1.106 deraadt 1144: <p>
1145: <li>
1.288 matthieu 1146: <a name="21"></a>
1.235 miod 1147:
1.294 david 1148: <h3><font color="#e00000">OpenBSD 2.1 Security Advisories</font></h3>
1.52 deraadt 1149: These are the OpenBSD 2.1 advisories. All these problems are solved
1.294 david 1150: in <a href="22.html">OpenBSD 2.2</a>. Some of these problems still
1.52 deraadt 1151: exist in other operating systems. (If you are running OpenBSD 2.1, we
1152: would strongly recommend an upgrade to the newest release, as this
1153: patch list only attempts at fixing the most important security
1154: problems. In particular, OpenBSD 2.2 fixes numerous localhost
1155: security problems. Many of those problems were solved in ways which
1156: make it hard for us to provide patches).
1157:
1.96 deraadt 1158: <p>
1.52 deraadt 1159: <ul>
1.112 philen 1160: <li><a href="advisories/signals.txt">Sep 15, 1997: Deviant Signals (patch included)</a>
1161: <li><a href="advisories/rfork.txt">Aug 2, 1997: Rfork() system call flaw
1.59 deraadt 1162: (patch included)</a>
1.112 philen 1163: <li><a href="advisories/procfs.txt">Jun 24, 1997: Procfs flaws (patch included)</a>
1.52 deraadt 1164: </ul>
1.51 deraadt 1165:
1.106 deraadt 1166: <p>
1167: <li>
1.288 matthieu 1168: <a name="20"></a>
1.235 miod 1169:
1.294 david 1170: <h3><font color="#e00000">OpenBSD 2.0 Security Advisories</font></h3>
1.99 deraadt 1171: These are the OpenBSD 2.0 advisories. All these problems are solved
1.294 david 1172: in <a href="21.html">OpenBSD 2.1</a>. Some of these problems still
1.99 deraadt 1173: exist in other operating systems. (If you are running OpenBSD 2.0, we
1174: commend you for being there back in the old days!, but you're really
1175: missing out if you don't install a new version!)
1176:
1177: <p>
1178: <ul>
1.112 philen 1179: <li><a href="advisories/res_random.txt">April 22, 1997: Predictable IDs in the
1.99 deraadt 1180: resolver (patch included)</a>
1181: <li>Many others... if people can hunt them down, please let me know
1182: and we'll put them up here.
1183: </ul>
1.51 deraadt 1184: <p>
1.106 deraadt 1185:
1.288 matthieu 1186: <a name="watching"></a>
1.294 david 1187: <li><h3><font color="#e00000">Watching our Changes</font></h3><p>
1.106 deraadt 1188:
1.21 deraadt 1189: Since we take a proactive stance with security, we are continually
1190: finding and fixing new security problems. Not all of these problems
1.80 espie 1191: get widely reported because (as stated earlier) many of them are not
1.45 deraadt 1192: confirmed to be exploitable; many simple bugs we fix do turn out to
1193: have security consequences we could not predict. We do not have the
1194: time resources to make these changes available in the above format.<p>
1.21 deraadt 1195:
1196: Thus there are usually minor security fixes in the current source code
1197: beyond the previous major OpenBSD release. We make a limited
1.45 deraadt 1198: guarantee that these problems are of minimal impact and unproven
1.44 ian 1199: exploitability. If we discover that a problem definitely matters for
1.45 deraadt 1200: security, patches will show up here <strong>VERY</strong> quickly.<p>
1.21 deraadt 1201:
1.45 deraadt 1202: People who are really concerned with security can do a number of
1203: things:<p>
1.21 deraadt 1204:
1205: <ul>
1206: <li>If you understand security issues, watch our
1.294 david 1207: <a href="mail.html">source-changes mailing list</a> and keep an
1.23 deraadt 1208: eye out for things which appear security related. Since
1.21 deraadt 1209: exploitability is not proven for many of the fixes we make,
1210: do not expect the relevant commit message to say "SECURITY FIX!".
1211: If a problem is proven and serious, a patch will be available
1212: here very shortly after.
1.161 horacio 1213: <li>In addition to source changes, you can watch our <a href="mail.html">
1.160 ericj 1214: security-announce mailing list</a> which will notify you for every
1.186 ian 1215: security related item that the OpenBSD team deems as a possible threat,
1.160 ericj 1216: and instruct you on how to patch the problem.
1.21 deraadt 1217: <li>Track our current source code tree, and teach yourself how to do a
1.29 deraadt 1218: complete system build from time to time (read /usr/src/Makefile
1219: carefully). Users can make the assumption that the current
1220: source tree always has stronger security than the previous release.
1.45 deraadt 1221: However, building your own system from source code is not trivial;
1.265 miod 1222: it is nearly 600MB of source code, and problems do occur as we
1.45 deraadt 1223: transition between major releases.
1.115 ericj 1224: <li>Install a binary snapshot for your
1.80 espie 1225: architecture, which are made available fairly often. For
1.29 deraadt 1226: instance, an i386 snapshot is typically made available weekly.
1.21 deraadt 1227: </ul>
1228:
1.9 deraadt 1229: <p>
1.288 matthieu 1230: <a name="reporting"></a>
1.294 david 1231: <li><h3><font color="#e00000">Reporting problems</font></h3><p>
1.3 deraadt 1232:
1.5 deraadt 1233: <p> If you find a new security problem, you can mail it to
1.294 david 1234: <a href="mailto:deraadt@openbsd.org">deraadt@openbsd.org</a>.
1.7 deraadt 1235: <br>
1.5 deraadt 1236: If you wish to PGP encode it (but please only do so if privacy is very
1.112 philen 1237: urgent, since it is inconvenient) use this <a href="advisories/pgpkey.txt">pgp key</a>.
1.5 deraadt 1238:
1.107 deraadt 1239: <p>
1.288 matthieu 1240: <a name="papers"></a>
1.294 david 1241: <li><h3><font color="#e00000">Further Reading</font></h3><p>
1.107 deraadt 1242:
1243: A number of papers have been written by OpenBSD team members, about security
1244: related changes they have done in OpenBSD. The postscript versions of these
1.108 deraadt 1245: documents are available as follows.<p>
1.107 deraadt 1246:
1247: <ul>
1.113 deraadt 1248: <li>A Future-Adaptable Password Scheme.<br>
1.294 david 1249: <a href="events.html#usenix99">Usenix 1999</a>,
1250: by <a href="mailto:provos@openbsd.org">Niels Provos</a>,
1251: <a href="mailto:dm@openbsd.org">David Mazieres</a>.<br>
1252: <a href="papers/bcrypt-paper.ps">paper</a> and
1253: <a href="papers/bcrypt-slides.ps">slides</a>.
1.113 deraadt 1254: <p>
1255: <li>Cryptography in OpenBSD: An Overview.<br>
1.294 david 1256: <a href="events.html#usenix99">Usenix 1999</a>,
1257: by <a href="mailto:deraadt@openbsd.org">Theo de Raadt</a>,
1258: <a href="mailto:niklas@openbsd.org">Niklas Hallqvist</a>,
1259: <a href="mailto:art@openbsd.org">Artur Grabowski</a>,
1260: <a href="mailto:angelos@openbsd.org">Angelos D. Keromytis</a>,
1261: <a href="mailto:provos@openbsd.org">Niels Provos</a>.<br>
1262: <a href="papers/crypt-paper.ps">paper</a> and
1263: <a href="papers/crypt-slides.ps">slides</a>.
1.113 deraadt 1264: <p>
1265: <li>strlcpy and strlcat -- consistent, safe, string copy and concatenation.<br>
1.294 david 1266: <a href="events.html#usenix99">Usenix 1999</a>,
1267: by <a href="mailto:millert@openbsd.org">Todd C. Miller</a>,
1268: <a href="mailto:deraadt@openbsd.org">Theo de Raadt</a>.<br>
1269: <a href="papers/strlcpy-paper.ps">paper</a> and
1270: <a href="papers/strlcpy-slides.ps">slides</a>.
1.113 deraadt 1271: <p>
1.118 deraadt 1272: <li>Dealing with Public Ethernet Jacks-Switches, Gateways, and Authentication.<br>
1.294 david 1273: <a href="events.html#lisa99">LISA 1999</a>,
1274: by <a href="mailto:beck@openbsd.org">Bob Beck</a>.<br>
1275: <a href="papers/authgw-paper.ps">paper</a> and
1276: <a href="papers/authgw-slides.ps">slides</a>.
1.118 deraadt 1277: <p>
1.153 jufi 1278: <li>Encrypting Virtual Memory<br>
1.294 david 1279: <a href="events.html#sec2000">Usenix Security 2000</a>,
1280: <a href="mailto:provos@openbsd.org">Niels Provos</a>.<br>
1281: <a href="papers/swapencrypt.ps">paper</a> and
1282: <a href="papers/swapencrypt-slides.ps">slides</a>.
1.142 deraadt 1283: <p>
1.107 deraadt 1284: </ul>
1.294 david 1285: </ul>
1.106 deraadt 1286:
1.2 deraadt 1287: <hr>
1.294 david 1288: <a href="index.html"><img height=24 width=24 src="back.gif" border=0 alt="OpenBSD"></a>
1289: <a href="mailto:www@openbsd.org">www@openbsd.org</a>
1.24 deraadt 1290: <br>
1.301 ! miod 1291: <small>$OpenBSD: security.html,v 1.300 2004/10/23 20:34:08 deraadt Exp $</small>
1.1 deraadt 1292:
1.24 deraadt 1293: </body>
1294: </html>
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