Annotation of www/security.html, Revision 1.243
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1.20 deraadt 4: <title>OpenBSD Security</title>
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1.210 jsyn 14: <a href="index.html"><img alt="[OpenBSD]" height="30" width="141" src="images/smalltitle.gif" border="0"></a>
1.106 deraadt 15: <p>
1.110 deraadt 16: <h2><font color=#e00000>Security</font><hr></h2>
1.1 deraadt 17:
1.114 philen 18: <table width="100%">
19: <tr>
20: <td colspan="2">
21: <strong>Index</strong>
22: </td>
23: </tr>
24: <tr>
25: <td valign="top">
1.106 deraadt 26: <a href=#goals>Security goals of the Project</a>.<br>
27: <a href=#disclosure>Full Disclosure policy</a>.<br>
28: <a href=#process>Source code auditing process</a>.<br>
1.111 aaron 29: <a href=#default>"Secure by Default"</a>.<br>
1.106 deraadt 30: <a href=#crypto>Use of Cryptography</a>.<br>
31: <p>
32: <a href=#watching>Watching changes</a>.<br>
33: <a href=#reporting>Reporting security issues</a>.<br>
1.107 deraadt 34: <a href=#papers>Further Reading</a><br>
1.106 deraadt 35: <p>
1.114 philen 36: </td>
37: <td valign="top">
1.225 deraadt 38: For security advisories for specific releases, click below:<br>
39: <a href="#20">2.0</a>,
40: <a href="#21">2.1</a>,
41: <a href="#22">2.2</a>,
42: <a href="#23">2.3</a>,
43: <a href="#24">2.4</a>,
44: <a href="#25">2.5</a>,
45: <a href="#26">2.6</a>,
46: <a href="#27">2.7</a>,
47: <a href="#28">2.8</a>,
48: <a href="#29">2.9</a>,
49: <a href="#30">3.0</a>,
50: <a href="#31">3.1</a>,
51: <a href="#32">3.2</a>.
1.114 philen 52: </td>
53: </tr>
54: </table>
1.56 deraadt 55: <hr>
56:
1.106 deraadt 57: <dl>
58: <a name=goals></a>
1.110 deraadt 59: <li><h3><font color=#e00000>Goal</font></h3><p>
1.22 deraadt 60:
1.14 deraadt 61: OpenBSD believes in strong security. Our aspiration is to be NUMBER
1.22 deraadt 62: ONE in the industry for security (if we are not already there). Our
63: open software development model permits us to take a more
64: uncompromising view towards increased security than Sun, SGI, IBM, HP,
65: or other vendors are able to. We can make changes the vendors would
1.27 deraadt 66: not make. Also, since OpenBSD is exported with <a href=crypto.html>
1.45 deraadt 67: cryptography</a>, we are able to take cryptographic approaches towards
68: fixing security problems.<p>
1.18 deraadt 69:
1.106 deraadt 70: <a name=disclosure></a>
1.110 deraadt 71: <li><h3><font color=#e00000>Full Disclosure</font></h3><p>
1.106 deraadt 72:
1.45 deraadt 73: Like many readers of the
1.196 jufi 74: <a href="http://online.securityfocus.com/archive/1">
1.18 deraadt 75: BUGTRAQ mailing list</a>,
1.106 deraadt 76: we believe in full disclosure of security problems. In the
77: operating system arena, we were probably the first to embrace
78: the concept. Many vendors, even of free software, still try
79: to hide issues from their users.<p>
80:
81: Security information moves very fast in cracker circles. On the other
82: hand, our experience is that coding and releasing of proper security
83: fixes typically requires about an hour of work -- very fast fix
84: turnaround is possible. Thus we think that full disclosure helps the
85: people who really care about security.<p>
86:
1.153 jufi 87: <a name=process></a>
1.110 deraadt 88: <li><h3><font color=#e00000>Audit Process</font></h3><p>
1.15 deraadt 89:
1.12 deraadt 90: Our security auditing team typically has between six and twelve
1.45 deraadt 91: members who continue to search for and fix new security holes. We
92: have been auditing since the summer of 1996. The process we follow to
93: increase security is simply a comprehensive file-by-file analysis of
1.106 deraadt 94: every critical software component. We are not so much looking for
95: security holes, as we are looking for basic software bugs, and if
1.138 deraadt 96: years later someone discovers the problem used to be a security
1.106 deraadt 97: issue, and we fixed it because it was just a bug, well, all the
98: better. Flaws have been found in just about every area of the system.
99: Entire new classes of security problems have been found during our
100: audit, and often source code which had been audited earlier needs
101: re-auditing with these new flaws in mind. Code often gets audited
102: multiple times, and by multiple people with different auditing
103: skills.<p>
1.12 deraadt 104:
1.94 deraadt 105: Some members of our security auditing team worked for Secure Networks,
106: the company that made the industry's premier network security scanning
107: software package Ballista (Secure Networks got purchased by Network
108: Associates, Ballista got renamed to Cybercop Scanner, and well...)
109: That company did a lot of security research, and thus fit in well
1.106 deraadt 110: with the OpenBSD stance. OpenBSD passed Ballista's tests with flying
111: colours since day 1.<p>
1.31 deraadt 112:
1.34 deraadt 113: Another facet of our security auditing process is its proactiveness.
1.45 deraadt 114: In most cases we have found that the determination of exploitability
115: is not an issue. During our ongoing auditing process we find many
116: bugs, and endeavor to fix them even though exploitability is not
117: proven. We fix the bug, and we move on to find other bugs to fix. We
118: have fixed many simple and obvious careless programming errors in code
119: and only months later discovered that the problems were in fact
120: exploitable. (Or, more likely someone on
1.197 jufi 121: <a href="http://online.securityfocus.com/archive/1">BUGTRAQ</a>
1.45 deraadt 122: would report that other operating systems were vulnerable to a `newly
123: discovered problem', and then it would be discovered that OpenBSD had
124: been fixed in a previous release). In other cases we have been saved
125: from full exploitability of complex step-by-step attacks because we
126: had fixed one of the intermediate steps. An example of where we
1.94 deraadt 127: managed such a success is the lpd advisory that Secure Networks put out.
128: <p>
1.29 deraadt 129:
1.110 deraadt 130: <li><h3><font color=#e00000>The Reward</font></h3><p>
1.106 deraadt 131:
1.45 deraadt 132: Our proactive auditing process has really paid off. Statements like
1.35 deraadt 133: ``This problem was fixed in OpenBSD about 6 months ago'' have become
1.45 deraadt 134: commonplace in security forums like
1.197 jufi 135: <a href="http://online.securityfocus.com/archive/1">BUGTRAQ</a>.<p>
1.35 deraadt 136:
1.45 deraadt 137: The most intense part of our security auditing happened immediately
1.80 espie 138: before the OpenBSD 2.0 release and during the 2.0->2.1 transition,
1.45 deraadt 139: over the last third of 1996 and first half of 1997. Thousands (yes,
140: thousands) of security issues were fixed rapidly over this year-long
141: period; bugs like the standard buffer overflows, protocol
142: implementation weaknesses, information gathering, and filesystem
143: races. Hence most of the security problems that we encountered were
144: fixed before our 2.1 release, and then a far smaller number needed
145: fixing for our 2.2 release. We do not find as many problems anymore,
146: it is simply a case of diminishing returns. Recently the security
147: problems we find and fix tend to be significantly more obscure or
148: complicated. Still we will persist for a number of reasons:<p>
1.36 deraadt 149:
1.35 deraadt 150: <ul>
1.45 deraadt 151: <li>Occasionally we find a simple problem we missed earlier. Doh!
1.35 deraadt 152: <li>Security is like an arms race; the best attackers will continue
1.45 deraadt 153: to search for more complicated exploits, so we will too.
154: <li>Finding and fixing subtle flaws in complicated software is
155: a lot of fun.
1.35 deraadt 156: </ul>
1.106 deraadt 157: <p>
1.15 deraadt 158:
1.14 deraadt 159: The auditing process is not over yet, and as you can see we continue
1.28 deraadt 160: to find and fix new security flaws.<p>
1.12 deraadt 161:
1.106 deraadt 162: <a name=default></a>
1.110 deraadt 163: <li><h3><font color=#e00000>"Secure by Default"</font></h3><p>
1.106 deraadt 164:
165: To ensure that novice users of OpenBSD do not need to become security
166: experts overnight (a viewpoint which other vendors seem to have), we
167: ship the operating system in a Secure by Default mode. All non-essential
168: services are disabled. As the user/administrator becomes more familiar
169: with the system, he will discover that he has to enable daemons and other
170: parts of the system. During the process of learning how to enable a new
171: service, the novice is more likely to learn of security considerations.<p>
172:
173: This is in stark contrast to the increasing number of systems that
174: ship with NFS, mountd, web servers, and various other services enabled
175: by default, creating instantaneous security problems for their users
176: within minutes after their first install.<p>
177:
1.153 jufi 178: <a name=crypto></a>
1.110 deraadt 179: <li><h3><font color=#e00000>Cryptography</font></h3><p>
1.106 deraadt 180:
181: And of course, since the OpenBSD project is based in Canada, it is possible
182: for us to integrate cryptography. For more information, read the page
1.116 deraadt 183: outlining <a href=crypto.html>what we have done with cryptography</a>.</p>
1.106 deraadt 184:
1.110 deraadt 185: <li><h3><font color=#e00000>Advisories</font></h3><p>
1.106 deraadt 186:
187: <dl>
188:
189: <li>
1.224 deraadt 190: <a name=32></a>
191:
192: <h3><font color=#e00000>OpenBSD 3.2 Security Advisories</font></h3>
193: These are the OpenBSD 3.2 advisories -- all these problems are solved
194: in <a href=anoncvs.html>OpenBSD current</a> and the
195: <a href=stable.html>patch branch</a>.
196:
197: <p>
198: <ul>
1.243 ! deraadt 199: <li><a href=errata32.html#kerberos>March 24, 2003:
1.242 millert 200: A cryptographic weaknesses in the Kerberos v4 protocol can be
201: exploited on Kerberos v5 as well.</a>
1.243 ! deraadt 202: <li><a href=errata32.html#kpr>March 19, 2003:
1.241 jufi 203: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 204: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.243 ! deraadt 205: <li><a href=errata32.html#blinding>March 18, 2003:
1.239 miod 206: Various SSL and TLS operations in OpenSSL are vulnerable to
207: timing attacks.</a>
1.243 ! deraadt 208: <li><a href=errata32.html#lprm>March 5, 2003:
1.238 millert 209: A buffer overflow in lprm(1) may allow an attacker to elevate
210: privileges to user daemon.</a>.
1.243 ! deraadt 211: <li><a href=errata32.html#sendmail>March 3, 2003:
1.237 miod 212: A buffer overflow in the envelope comments processing in
213: sendmail(8) may allow an attacker to gain root privileges.</a>
1.243 ! deraadt 214: <li><a href=errata32.html#httpd>February 25, 2003:
1.236 margarid 215: httpd(8) leaks file inode numbers via ETag header as well as
216: child PIDs in multipart MIME boundary generation. This could
217: lead, for example, to NFS exploitation because it uses inode
218: numbers as part of the file handle.</a>
1.243 ! deraadt 219: <li><a href=errata32.html#ssl>February 22, 2003:
1.234 margarid 220: In ssl(8) an information leak can occur via timing by performing
221: a MAC computation even if incorrect block cipher padding has
222: been found, this is a countermeasure. Also, check for negative
223: sizes, in allocation routines.</a>
1.243 ! deraadt 224: <li><a href=errata32.html#cvs>January 20, 2003:
1.232 millert 225: A double free exists in cvs(1) that could lead to privilege
226: escalation for cvs configurations where the cvs command is
1.233 margarid 227: run as a privileged user.</a>
1.243 ! deraadt 228: <li><a href=errata32.html#named>November 14, 2002:
1.230 millert 229: A buffer overflow exists in named(8) that could lead to a
230: remote crash or code execution as user named in a chroot jail.</a>
1.243 ! deraadt 231: <li><a href=errata32.html#pool>November 6, 2002:
1.233 margarid 232: A logic error in the pool kernel memory allocator could cause
233: memory corruption in low-memory situations, causing the system
234: to crash.</a>
1.243 ! deraadt 235: <li><a href=errata32.html#smrsh>November 6, 2002:
1.229 miod 236: An attacker can bypass smrsh(8)'s restrictions and execute
237: arbitrary commands with the privileges of his own account.</a>
1.243 ! deraadt 238: <li><a href=errata32.html#pfbridge>November 6, 2002:
1.233 margarid 239: Network bridges running pf with scrubbing enabled could cause
240: mbuf corruption, causing the system to crash.</a>
1.243 ! deraadt 241: <li><a href=errata32.html#kadmin>October 21, 2002:
1.228 miod 242: A buffer overflow can occur in the kadmind(8) daemon, leading
243: to possible remote crash or exploit.</a>
1.224 deraadt 244: </ul>
245:
1.227 miod 246: <p>
247: <li>
1.203 deraadt 248: <a name=31></a>
249:
250: <h3><font color=#e00000>OpenBSD 3.1 Security Advisories</font></h3>
251: These are the OpenBSD 3.1 advisories -- all these problems are solved
252: in <a href=anoncvs.html>OpenBSD current</a> and the
253: <a href=stable.html>patch branch</a>.
254:
255: <p>
256: <ul>
1.242 millert 257: <li><a href=errata31.html#kerberos>March 24, 2003:
258: A cryptographic weaknesses in the Kerberos v4 protocol can be
259: exploited on Kerberos v5 as well.</a>
1.240 miod 260: <li><a href=errata31.html#kpr>March 19, 2003:
1.241 jufi 261: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 262: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.239 miod 263: <li><a href=errata31.html#blinding>March 18, 2003:
264: Various SSL and TLS operations in OpenSSL are vulnerable to
265: timing attacks.</a>
1.238 millert 266: <li><a href=errata31.html#lprm>March 4, 2003:
267: A buffer overflow in lprm(1) may allow an attacker to gain
268: root privileges.</a>
1.237 miod 269: <li><a href=errata31.html#sendmail>March 3, 2003:
270: A buffer overflow in the envelope comments processing in
271: sendmail(8) may allow an attacker to gain root privileges.</a>
1.235 miod 272: <li><a href=errata31.html#ssl2>February 23, 2003:
273: In ssl(8) an information leak can occur via timing by performing
274: a MAC computation even if incorrect block cipher padding has
275: been found, this is a countermeasure. Also, check for negative
276: sizes, in allocation routines.</a>
1.232 millert 277: <li><a href=errata31.html#cvs>January 20, 2003:
278: A double free exists in cvs(1) that could lead to privilege
279: escalation for cvs configurations where the cvs command is
280: run as a privileged user.
1.230 millert 281: <li><a href=errata31.html#named>November 14, 2002:
282: A buffer overflow exists in named(8) that could lead to a
283: remote crash or code execution as user named in a chroot jail.</a>
1.229 miod 284: <li><a href=errata31.html#kernresource>November 6, 2002:
285: Incorrect argument checking in the getitimer(2) system call
286: may allow an attacker to crash the system.</a>
287: <li><a href=errata31.html#smrsh>November 6, 2002:
288: An attacker can bypass smrsh(8)'s restrictions and execute
289: arbitrary commands with the privileges of his own account.</a>
1.226 miod 290: <li><a href=errata31.html#kadmin>October 21, 2002:
291: A buffer overflow can occur in the kadmind(8) daemon, leading
292: to possible remote crash or exploit.</a>
1.224 deraadt 293: <li><a href=errata31.html#kerntime>October 2, 2002:
1.222 jason 294: Incorrect argument checking in the setitimer(2) system call
295: may allow an attacker to write to kernel memory.</a>
1.224 deraadt 296: <li><a href=errata31.html#scarg>August 11, 2002:
1.221 provos 297: An insufficient boundary check in the select system call
1.220 miod 298: allows an attacker to overwrite kernel memory and execute arbitrary code
299: in kernel context.</a>
1.224 deraadt 300: <li><a href=errata31.html#ssl>July 30, 2002:
1.218 miod 301: Several remote buffer overflows can occur in the SSL2 server and SSL3
302: client of the ssl(8) library, as in the ASN.1 parser code in the
303: crypto(3) library, all of them being potentially remotely
304: exploitable.</a>
1.224 deraadt 305: <li><a href=errata31.html#xdr>July 29, 2002:
1.218 miod 306: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
307: possible remote crash.</a>
1.224 deraadt 308: <li><a href=errata31.html#pppd>July 29, 2002:
1.218 miod 309: A race condition exists in the pppd(8) daemon which may cause it to
310: alter the file permissions of an arbitrary file.</a>
1.224 deraadt 311: <li><a href=errata31.html#isakmpd>July 5, 2002:
1.218 miod 312: Receiving IKE payloads out of sequence can cause isakmpd(8) to
313: crash.</a>
1.224 deraadt 314: <li><a href=errata31.html#ktrace>June 27, 2002:
1.215 miod 315: The kernel would let any user ktrace set[ug]id processes.</a>
1.224 deraadt 316: <li><a href=errata31.html#modssl>June 26, 2002:
1.213 miod 317: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 318: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.224 deraadt 319: <li><a href=errata31.html#resolver>June 25, 2002:
1.212 millert 320: A potential buffer overflow in the DNS resolver has been found.</a>
1.224 deraadt 321: <li><a href=errata31.html#sshd>June 24, 2002:
1.216 deraadt 322: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 323: input validation error that can result in an integer overflow and
324: privilege escalation.</a>
1.224 deraadt 325: <li><a href=errata31.html#httpd>June 19, 2002:
1.211 miod 326: A buffer overflow can occur during the interpretation of chunked
327: encoding in httpd(8), leading to possible remote crash.</a>
1.224 deraadt 328: <li><a href=errata31.html#sshbsdauth>May 22, 2002:
1.209 markus 329: Under certain conditions, on systems using YP with netgroups
330: in the password database, it is possible that sshd(8) does
331: ACL checks for the requested user name but uses the password
332: database entry of a different user for authentication. This
333: means that denied users might authenticate successfully
334: while permitted users could be locked out.</a>
1.224 deraadt 335: <li><a href=errata31.html#fdalloc2>May 8, 2002:
1.208 millert 336: A race condition exists that could defeat the kernel's
337: protection of fd slots 0-2 for setuid processes.</a>
1.224 deraadt 338: <li><a href=errata31.html#sudo>April 25, 2002:
1.205 millert 339: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.224 deraadt 340: <li><a href=errata31.html#sshafs>April 22, 2002:
1.205 millert 341: A local user can gain super-user privileges due to a buffer
342: overflow in sshd(8) if AFS has been configured on the system
343: or if KerberosTgtPassing or AFSTokenPassing has been enabled
344: in the sshd_config file.</a>
1.203 deraadt 345: </ul>
346:
1.235 miod 347: </dl>
1.203 deraadt 348: <p>
1.235 miod 349: OpenBSD 3.0 and earlier releases are not supported anymore. The following
350: paragraphs only list advisories issued while they were maintained; these
351: releases are likely to be affected by the advisories for more recent releases.
352: <br>
1.203 deraadt 353:
1.235 miod 354: <p>
355: <dl>
356:
357: <p>
1.203 deraadt 358: <li>
1.187 deraadt 359: <a name=30></a>
360:
361: <h3><font color=#e00000>OpenBSD 3.0 Security Advisories</font></h3>
362: These are the OpenBSD 3.0 advisories -- all these problems are solved
363: in <a href=anoncvs.html>OpenBSD current</a> and the
364: <a href=stable.html>patch branch</a>.
365:
366: <p>
367: <ul>
1.230 millert 368: <li><a href=errata30.html#named>November 14, 2002:
369: A buffer overflow exists in named(8) that could lead to a
370: remote crash or code execution as user named in a chroot jail.</a>
1.229 miod 371: <li><a href=errata30.html#kernresource>November 6, 2002:
372: Incorrect argument checking in the getitimer(2) system call
373: may allow an attacker to crash the system.</a>
374: <li><a href=errata30.html#smrsh>November 6, 2002:
375: An attacker can bypass smrsh(8)'s restrictions and execute
376: arbitrary commands with the privileges of his own account.</a>
1.226 miod 377: <li><a href=errata30.html#kadmin>October 21, 2002:
378: A buffer overflow can occur in the kadmind(8) daemon, leading
379: to possible remote crash or exploit.</a>
1.223 miod 380: <li><a href=errata30.html#kerntime>October 7, 2002:
381: Incorrect argument checking in the setitimer(2) system call
382: may allow an attacker to write to kernel memory.</a>
1.220 miod 383: <li><a href=errata30.html#scarg>August 11, 2002:
384: An insufficient boundary check in the select and poll system calls
385: allows an attacker to overwrite kernel memory and execute arbitrary code
386: in kernel context.</a>
1.218 miod 387: <li><a href=errata30.html#ssl>July 30, 2002:
388: Several remote buffer overflows can occur in the SSL2 server and SSL3
389: client of the ssl(8) library, as in the ASN.1 parser code in the
390: crypto(3) library, all of them being potentially remotely
391: exploitable.</a>
392: <li><a href=errata30.html#xdr>July 29, 2002:
393: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
394: possible remote crash.</a>
395: <li><a href=errata30.html#pppd>July 29, 2002:
396: A race condition exists in the pppd(8) daemon which may cause it to
397: alter the file permissions of an arbitrary file.</a>
1.219 miod 398: <li><a href=errata30.html#isakmpd2>July 5, 2002:
1.218 miod 399: Receiving IKE payloads out of sequence can cause isakmpd(8) to
400: crash.</a>
1.215 miod 401: <li><a href=errata30.html#ktrace>June 27, 2002:
402: The kernel would let any user ktrace set[ug]id processes.</a>
1.212 millert 403: <li><a href=errata30.html#resolver>June 25, 2002:
404: A potential buffer overflow in the DNS resolver has been found.</a>
1.213 miod 405: <li><a href=errata30.html#sshdauth>June 24, 2002:
1.216 deraadt 406: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 407: input validation error that can result in an integer overflow and
408: privilege escalation.</a>
409: <li><a href=errata30.html#modssl>June 24, 2002:
410: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 411: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.213 miod 412: <li><a href=errata30.html#httpd>June 19, 2002:
413: A buffer overflow can occur during the interpretation of chunked
414: encoding in httpd(8), leading to possible remote crash.</a>
1.208 millert 415: <li><a href=errata30.html#fdalloc2>May 8, 2002:
416: A race condition exists that could defeat the kernel's
417: protection of fd slots 0-2 for setuid processes.</a>
1.205 millert 418: <li><a href=errata30.html#sudo2>April 25, 2002:
419: A bug in sudo may allow an attacker to corrupt the heap.</a>
420: <li><a href=errata30.html#sshafs>April 22, 2002:
421: A local user can gain super-user privileges due to a buffer
422: overflow in sshd(8) if AFS has been configured on the system
423: or if KerberosTgtPassing or AFSTokenPassing has been enabled
424: in the sshd_config file.</a>
1.203 deraadt 425: <li><a href=errata30.html#mail>April 11, 2002:
1.202 millert 426: The mail(1) was interpreting tilde escapes even when invoked
427: in non-interactive mode. As mail(1) is called as root from cron,
428: this can lead to a local root compromise.</a>
1.203 deraadt 429: <li><a href=errata30.html#approval>March 19, 2002:
1.201 millert 430: Under certain conditions, on systems using YP with netgroups in
431: the password database, it is possible for the rexecd(8) and rshd(8)
432: daemons to execute a shell from a password database entry for a
433: different user. Similarly, atrun(8) may change to the wrong
434: home directory when running jobs.</a>
1.203 deraadt 435: <li><a href=errata30.html#zlib>March 13, 2002:
1.200 millert 436: A potential double free() exists in the zlib library;
437: this is not exploitable on OpenBSD.
438: The kernel also contains a copy of zlib; it is not
439: currently known if the kernel zlib is exploitable.</a>
1.203 deraadt 440: <li><a href=errata30.html#openssh>March 8, 2002:
1.198 millert 441: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 442: may allow a local user to gain super-user privileges.</a>
1.203 deraadt 443: <li><a href=errata30.html#ptrace>January 21, 2002:
1.192 jason 444: A race condition between the ptrace(2) and execve(2) system calls
445: allows an attacker to modify the memory contents of suid/sgid
446: processes which could lead to compromise of the super-user account.</a>
1.203 deraadt 447: <li><a href=errata30.html#sudo>January 17, 2002:
1.191 millert 448: There is a security hole in sudo(8) that can be exploited
449: when the Postfix sendmail replacement is installed that may
450: allow an attacker on the local host to gain root privileges.</a>
1.203 deraadt 451: <li><a href=errata30.html#lpd>November 28, 2001:
1.189 millert 452: An attacker can trick a machine running the lpd daemon into
453: creating new files in the root directory from a machine with
454: remote line printer access.</a>
1.203 deraadt 455: <li><a href=errata30.html#vi.recover>November 13, 2001:
1.188 millert 456: The vi.recover script can be abused in such a way as
457: to cause arbitrary zero-length files to be removed.</a>
1.203 deraadt 458: <li><a href=errata30.html#pf>November 13, 2001:
1.190 mpech 459: pf(4) was incapable of dealing with certain ipv6 icmp packets,
460: resulting in a crash.</a>
1.203 deraadt 461: <li><a href=errata30.html#sshd>November 12, 2001:
1.190 mpech 462: A security hole that may allow an attacker to partially authenticate
463: if -- and only if -- the administrator has enabled KerberosV.</a>
1.187 deraadt 464: </ul>
465:
466: <p>
467: <li>
1.173 deraadt 468: <a name=29></a>
469:
470: <h3><font color=#e00000>OpenBSD 2.9 Security Advisories</font></h3>
471: These are the OpenBSD 2.9 advisories -- all these problems are solved
472: in <a href=anoncvs.html>OpenBSD current</a> and the
1.179 jufi 473: <a href=stable.html>patch branch</a>.
1.173 deraadt 474:
475: <p>
476: <ul>
1.212 millert 477: <li><a href=errata29.html#resolver>June 25, 2002:
478: A potential buffer overflow in the DNS resolver has been found.</a>
1.208 millert 479: <li><a href=errata29.html#fdalloc2>May 8, 2002:
480: A race condition exists that could defeat the kernel's
481: protection of fd slots 0-2 for setuid processes.</a>
1.207 millert 482: <li><a href=errata29.html#sudo2>April 25, 2002:
483: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.206 millert 484: <li><a href=errata29.html#sshafs>April 22, 2002:
485: A local user can gain super-user privileges due to a buffer
486: overflow in sshd(8) if AFS has been configured on the system
487: or if KerberosTgtPassing or AFSTokenPassing has been enabled
488: in the sshd_config file.</a>
1.202 millert 489: <li><a href=errata29.html#mail>April 11, 2002:
490: The mail(1) was interpreting tilde escapes even when invoked
491: in non-interactive mode. As mail(1) is called as root from cron,
492: this can lead to a local root compromise.</a>
1.200 millert 493: <li><a href=errata29.html#zlib>March 13, 2002:
494: A potential double free() exists in the zlib library;
495: this is not exploitable on OpenBSD.
496: The kernel also contains a copy of zlib; it is not
497: currently known if the kernel zlib is exploitable.</a>
1.198 millert 498: <li><a href=errata29.html#openssh>March 8, 2002:
499: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 500: may allow a local user to gain super-user privileges.</a>
1.198 millert 501: <li><a href=errata29.html#ptrace>January 21, 2002:
502: A race condition between the ptrace(2) and execve(2) system calls
503: allows an attacker to modify the memory contents of suid/sgid
504: processes which could lead to compromise of the super-user account.</a>
1.191 millert 505: <li><a href=errata29.html#sudo>January 17, 2002:
506: There is a security hole in sudo(8) that can be exploited
507: when the Postfix sendmail replacement is installed that may
508: allow an attacker on the local host to gain root privileges.</a>
1.189 millert 509: <li><a href=errata29.html#lpd2>November 28, 2001:
510: An attacker can trick a machine running the lpd daemon into
511: creating new files in the root directory from a machine with
512: remote line printer access.</a>
1.190 mpech 513: <li><a href=errata29.html#vi.recover>November 13, 2001:
514: The vi.recover script can be abused in such a way as
515: to cause arbitrary zero-length files to be removed.</a>
1.185 deraadt 516: <li><a href=errata29.html#uucp>September 11, 2001:
1.184 millert 517: A security hole exists in uuxqt(8) that may allow an
518: attacker to gain root privileges.</a>
1.185 deraadt 519: <li><a href=errata29.html#lpd>August 29, 2001:
1.183 millert 520: A security hole exists in lpd(8) that may allow an
521: attacker to gain root privileges if lpd is running.</a>
1.185 deraadt 522: <li><a href=errata29.html#sendmail2>August 21, 2001:
1.181 millert 523: A security hole exists in sendmail(8) that may allow an
524: attacker on the local host to gain root privileges.</a>
1.185 deraadt 525: <li><a href=errata29.html#nfs>July 30, 2001:
1.180 jason 526: A kernel buffer overflow in the NFS code can be used to execute
527: arbitrary code by users with mount privileges (only root by
1.181 millert 528: default).</a>
1.185 deraadt 529: <li><a href=errata29.html#kernexec>June 15, 2001:
1.178 aaron 530: A race condition in the kernel can lead to local root compromise.</a>
1.185 deraadt 531: <li><a href=errata29.html#sshcookie>June 12, 2001:
1.177 markus 532: sshd(8) allows users to delete arbitrary files named "cookies"
533: if X11 forwarding is enabled. X11 forwarding is disabled
534: by default.</a>
1.185 deraadt 535: <li><a href=errata29.html#fts>May 30, 2001:
1.176 millert 536: Programs using the fts routines can be tricked into changing
537: into the wrong directory.</a>
1.185 deraadt 538: <li><a href=errata29.html#sendmail>May 29, 2001:
1.174 millert 539: Sendmail signal handlers contain unsafe code,
540: leading to numerous race conditions.</a>
1.173 deraadt 541: </ul>
542:
543: <p>
544: <li>
1.152 deraadt 545: <a name=28></a>
546:
547: <h3><font color=#e00000>OpenBSD 2.8 Security Advisories</font></h3>
548: These are the OpenBSD 2.8 advisories -- all these problems are solved
1.154 millert 549: in <a href=anoncvs.html>OpenBSD current</a> and the
1.179 jufi 550: <a href=stable.html>patch branch</a>.
1.152 deraadt 551:
552: <p>
553: <ul>
1.184 millert 554: <li><a href=errata28.html#uucp>September 11, 2001:
555: A security hole exists in uuxqt(8) that may allow an
556: attacker to gain root privileges.</a>
1.183 millert 557: <li><a href=errata28.html#lpd>August 29, 2001:
558: A security hole exists in lpd(8) that may allow an
559: attacker to gain root privileges if lpd is running.</a>
1.181 millert 560: <li><a href=errata28.html#sendmail2>August 21, 2001:
561: A security hole exists in sendmail(8) that may allow an
562: attacker on the local host to gain root privileges.</a>
1.178 aaron 563: <li><a href=errata28.html#kernexec>June 15, 2001:
564: A race condition in the kernel can lead to local root compromise.</a>
1.176 millert 565: <li><a href=errata28.html#fts>May 30, 2001:
566: Programs using the fts routines can be tricked into changing
567: into the wrong directory.</a>
1.175 millert 568: <li><a href=errata28.html#sendmail>May 29, 2001:
569: Sendmail signal handlers contain unsafe code,
570: leading to numerous race conditions.</a>
1.173 deraadt 571: <li><a href=errata28.html#ipf_frag>Apr 23, 2001:
1.231 mickey 572: IPF contains a serious bug with its handling of fragment caching.</a>
1.173 deraadt 573: <li><a href=errata28.html#glob_limit>Apr 23, 2001:
1.172 ericj 574: ftpd(8) contains a potential DoS relating to glob(3).</a>
1.173 deraadt 575: <li><a href=errata28.html#glob>Apr 10, 2001:
1.170 ericj 576: The glob(3) library call contains multiple buffer overflows.</a>
1.173 deraadt 577: <li><a href=errata28.html#readline>Mar 18, 2001:
1.169 millert 578: The readline library creates history files with permissive modes based on the user's umask.</a>
1.173 deraadt 579: <li><a href=errata28.html#ipsec_ah>Mar 2, 2001:
1.167 ericj 580: Insufficient checks in the IPSEC AH IPv4 option handling code can lead to a buffer overrun in the kernel.</a>
1.173 deraadt 581: <li><a href=errata28.html#userldt>Mar 2, 2001:
1.168 horacio 582: The <b>USER_LDT</b> kernel option allows an attacker to gain access to privileged areas of kernel memory.</a>
1.173 deraadt 583: <li><a href=errata28.html#sudo>Feb 22, 2001:
1.171 millert 584: a non-exploitable buffer overflow was fixed in sudo(8).</a>
1.173 deraadt 585: <li><a href=errata28.html#named>Jan 29, 2001:
1.163 jason 586: merge named(8) with ISC BIND 4.9.8-REL, which fixes some buffer vulnerabilities.</a>
1.173 deraadt 587: <li><a href=errata28.html#rnd>Jan 22, 2001:
1.162 jason 588: rnd(4) did not use all of its input when written to.</a>
1.173 deraadt 589: <li><a href=errata28.html#xlock>Dec 22, 2000:
1.159 ericj 590: xlock(1)'s authentication was re-done to authenticate via a named pipe. (patch and new xlock binaries included).</a>
1.173 deraadt 591: <li><a href=errata28.html#procfs>Dec 18, 2000:
1.157 ericj 592: Procfs contains numerous overflows. Procfs is not used by default in OpenBSD. (patch included).</a>
1.173 deraadt 593: <li><a href=errata28.html#kerberos2>Dec 10, 2000:
1.156 deraadt 594: Another problem exists in KerberosIV libraries (patch included).</a>
1.173 deraadt 595: <li><a href=errata28.html#kerberos>Dec 7, 2000:
1.155 deraadt 596: A set of problems in KerberosIV exist (patch included).</a>
1.173 deraadt 597: <li><a href=errata28.html#ftpd>Dec 4, 2000:
1.154 millert 598: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.152 deraadt 599: </ul>
600:
601: <p>
602: <li>
1.124 deraadt 603: <a name=27></a>
604:
605: <h3><font color=#e00000>OpenBSD 2.7 Security Advisories</font></h3>
606: These are the OpenBSD 2.7 advisories -- all these problems are solved
607: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
608: OpenBSD 2.6 advisories listed below are fixed in OpenBSD 2.7.
609:
610: <p>
611: <ul>
1.169 millert 612: <li><a href=errata27.html#readline>Mar 18, 2001:
613: The readline library creates history files with permissive modes based on the user's umask.</a>
614: <li><a href=errata27.html#sudo>Feb 22, 2001:
615: a buffer overflow was fixed in sudo(8).</a>
1.154 millert 616: <li><a href=errata27.html#ftpd>Dec 4, 2000:
617: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.152 deraadt 618: <li><a href=errata27.html#sshforwarding>Nov 10, 2000:
619: Hostile servers can force OpenSSH clients to do agent or X11 forwarding.
620: (patch included)</a>
621: <li><a href=errata27.html#xtrans>Oct 26, 2000:
1.151 matthieu 622: X11 libraries have 2 potential overflows in xtrans code.
623: (patch included)</a>
1.152 deraadt 624: <li><a href=errata27.html#httpd>Oct 18, 2000:
1.150 beck 625: Apache mod_rewrite and mod_vhost_alias modules could expose files
626: on the server in certain configurations if used.
627: (patch included)</a>
1.164 deraadt 628: <li><a href=errata27.html#telnetd>Oct 10, 2000:
1.149 millert 629: The telnet daemon does not strip out the TERMINFO, TERMINFO_DIRS,
630: TERMPATH and TERMCAP environment variables as it should.
631: (patch included)</a>
1.152 deraadt 632: <li><a href=errata27.html#format_strings>Oct 6, 2000:
1.148 millert 633: There are printf-style format string bugs in several privileged
634: programs. (patch included)</a>
1.152 deraadt 635: <li><a href=errata27.html#curses>Oct 6, 2000:
1.147 millert 636: libcurses honored terminal descriptions in the $HOME/.terminfo
637: directory as well as in the TERMCAP environment variable for
638: setuid and setgid applications.
1.146 deraadt 639: (patch included)</a>
1.152 deraadt 640: <li><a href=errata27.html#talkd>Oct 6, 2000:
1.146 deraadt 641: A format string vulnerability exists in talkd(8).
642: (patch included)</a>
1.152 deraadt 643: <li><a href=errata27.html#pw_error>Oct 3, 2000:
1.145 aaron 644: A format string vulnerability exists in the pw_error() function of the
645: libutil library, yielding localhost root through chpass(1).
646: (patch included)</a>
1.152 deraadt 647: <li><a href=errata27.html#ipsec>Sep 18, 2000:
1.144 jason 648: Bad ESP/AH packets could cause a crash under certain conditions.
649: (patch included)</a>
1.152 deraadt 650: <li><a href=errata27.html#xlock>Aug 16, 2000:
1.141 deraadt 651: A format string vulnerability (localhost root) exists in xlock(1).
652: (patch included)</a>
1.152 deraadt 653: <li><a href=errata27.html#X11_libs>July 14, 2000:
1.139 deraadt 654: Various bugs found in X11 libraries have various side effects, almost
655: completely denial of service in OpenBSD.
656: (patch included)</a>
1.152 deraadt 657: <li><a href=errata27.html#ftpd>July 5, 2000:
1.136 deraadt 658: Just like pretty much all the other unix ftp daemons
659: on the planet, ftpd had a remote root hole in it.
660: Luckily, ftpd was not enabled by default.
1.137 deraadt 661: The problem exists if anonymous ftp is enabled.
1.136 deraadt 662: (patch included)</a>
1.152 deraadt 663: <li><a href=errata27.html#mopd>July 5, 2000:
1.136 deraadt 664: Mopd, very rarely used, contained some buffer overflows.
665: (patch included)</a>
1.152 deraadt 666: <li><a href=errata27.html#libedit>June 28, 2000:
1.135 deraadt 667: libedit would check for a <b>.editrc</b> file in the current
668: directory. Not known to be a real security issue, but a patch
669: is available anyways.
670: (patch included)</a>
1.152 deraadt 671: <li><a href=errata27.html#dhclient>June 24, 2000:
1.134 deraadt 672: A serious bug in dhclient(8) could allow strings from a
673: malicious dhcp server to be executed in the shell as root.
674: (patch included)</a>
1.152 deraadt 675: <li><a href=errata27.html#isakmpd>June 9, 2000:
1.133 deraadt 676: A serious bug in isakmpd(8) policy handling wherein
677: policy verification could be completely bypassed in isakmpd.
678: (patch included)</a>
1.152 deraadt 679: <li><a href=errata27.html#uselogin>June 6, 2000:
1.132 deraadt 680: The non-default flag UseLogin in <b>/etc/sshd_config</b> is broken,
681: should not be used, and results in security problems on
682: other operating systems.</a>
1.152 deraadt 683: <li><a href=errata27.html#bridge>May 26, 2000:
1.129 deraadt 684: The bridge(4) <i>learning</i> flag may be bypassed.
1.128 deraadt 685: (patch included)</a>
1.152 deraadt 686: <li><a href=errata27.html#ipf>May 25, 2000:
1.127 kjell 687: Improper use of ipf <i>keep-state</i> rules can result
688: in firewall rules being bypassed. (patch included)</a>
689:
1.124 deraadt 690: </ul>
691:
692: <p>
693: <li>
1.119 deraadt 694: <a name=26></a>
695:
696: <h3><font color=#e00000>OpenBSD 2.6 Security Advisories</font></h3>
697: These are the OpenBSD 2.6 advisories -- all these problems are solved
698: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
699: OpenBSD 2.5 advisories listed below are fixed in OpenBSD 2.6.
700:
701: <p>
702: <ul>
1.130 deraadt 703: <li><a href=errata26.html#semconfig>May 26, 2000:
704: SYSV semaphore support contained an undocumented system call
1.131 deraadt 705: which could wedge semaphore-using processes from exiting. (patch included)</a>
1.127 kjell 706: <li><a href=errata26.html#ipf>May 25, 2000:
707: Improper use of ipf <i>keep-state</i> rules can result
708: in firewall rules being bypassed. (patch included)</a>
1.126 deraadt 709: <li><a href=errata26.html#xlockmore>May 25, 2000:
1.125 deraadt 710: xlockmore has a bug which a localhost attacker can use to gain
711: access to the encrypted root password hash (which is normally
712: encoded using blowfish (see
713: <a href="http://www.openbsd.org/cgi-bin/man.cgi?query=crypt&sektion=3">
714: crypt(3)</a>)
715: (patch included).</a>
1.126 deraadt 716: <li><a href=errata26.html#procfs>Jan 20, 2000:
1.123 deraadt 717: Systems running with procfs enabled and mounted are
718: vulnerable to a very tricky exploit. procfs is not
719: mounted by default.
720: (patch included).</a>
1.190 mpech 721: <li><a href=errata26.html#sendmail>Dec 4, 1999:
722: Sendmail permitted any user to cause a aliases file wrap,
723: thus exposing the system to a race where the aliases file
724: did not exist.
1.119 deraadt 725: (patch included).</a>
1.190 mpech 726: <li><a href=errata26.html#poll>Dec 4, 1999:
727: Various bugs in poll(2) may cause a kernel crash.</a>
1.126 deraadt 728: <li><a href=errata26.html#sslUSA>Dec 2, 1999:
1.120 deraadt 729: A buffer overflow in the RSAREF code included in the
730: USA version of libssl, is possibly exploitable in
731: httpd, ssh, or isakmpd, if SSL/RSA features are enabled.
1.124 deraadt 732: (patch included).<br></a>
733: <strong>Update:</strong> Turns out that this was not exploitable
734: in any of the software included in OpenBSD 2.6.
1.190 mpech 735: <li><a href=errata26.html#ifmedia>Nov 9, 1999:
736: Any user could change interface media configurations, resulting in
737: a localhost denial of service attack.
1.121 deraadt 738: (patch included).</a>
1.119 deraadt 739: </ul>
740:
741: <p>
742: <li>
1.93 deraadt 743: <a name=25></a>
1.106 deraadt 744:
1.110 deraadt 745: <h3><font color=#e00000>OpenBSD 2.5 Security Advisories</font></h3>
1.93 deraadt 746: These are the OpenBSD 2.5 advisories -- all these problems are solved
747: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
748: OpenBSD 2.4 advisories listed below are fixed in OpenBSD 2.5.
749:
1.96 deraadt 750: <p>
1.104 deraadt 751: <ul>
1.117 deraadt 752: <li><a href=errata25.html#cron>Aug 30, 1999:
1.103 deraadt 753: In cron(8), make sure argv[] is NULL terminated in the
754: fake popen() and run sendmail as the user, not as root.
755: (patch included).</a>
1.117 deraadt 756: <li><a href=errata25.html#miscfs>Aug 12, 1999: The procfs and fdescfs
1.101 deraadt 757: filesystems had an overrun in their handling of uio_offset
758: in their readdir() routines. (These filesystems are not
759: enabled by default). (patch included).</a>
1.117 deraadt 760: <li><a href=errata25.html#profil>Aug 9, 1999: Stop profiling (see profil(2))
1.100 deraadt 761: when we execve() a new process. (patch included).</a>
1.117 deraadt 762: <li><a href=errata25.html#ipsec_in_use>Aug 6, 1999: Packets that should have
1.98 deraadt 763: been handled by IPsec may be transmitted as cleartext.
764: PF_KEY SA expirations may leak kernel resources.
765: (patch included).</a>
1.117 deraadt 766: <li><a href=errata25.html#rc>Aug 5, 1999: In /etc/rc, use mktemp(1) for
1.97 deraadt 767: motd re-writing and change the find(1) to use -execdir
768: (patch included).</a>
1.117 deraadt 769: <li><a href=errata25.html#chflags>Jul 30, 1999: Do not permit regular
1.95 deraadt 770: users to chflags(2) or fchflags(2) on character or block devices
771: which they may currently be the owner of (patch included).</a>
1.117 deraadt 772: <li><a href=errata25.html#nroff>Jul 27, 1999: Cause groff(1) to be invoked
1.95 deraadt 773: with the -S flag, when called by nroff(1) (patch included).</a>
1.93 deraadt 774: </ul>
775:
1.106 deraadt 776: <p>
777: <li>
1.75 deraadt 778: <a name=24></a>
1.235 miod 779:
1.110 deraadt 780: <h3><font color=#e00000>OpenBSD 2.4 Security Advisories</font></h3>
1.75 deraadt 781: These are the OpenBSD 2.4 advisories -- all these problems are solved
782: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
783: OpenBSD 2.3 advisories listed below are fixed in OpenBSD 2.4.
784:
1.96 deraadt 785: <p>
1.75 deraadt 786: <ul>
1.92 deraadt 787: <li><a href=errata24.html#poll>Mar 22, 1999: The nfds argument for poll(2) needs
1.91 deraadt 788: to be constrained, to avoid kvm starvation (patch included).</a>
1.92 deraadt 789: <li><a href=errata24.html#tss>Mar 21, 1999: A change in TSS handling stops
1.91 deraadt 790: another kernel crash case caused by the <strong>crashme</strong>
791: program (patch included).</a>
1.92 deraadt 792: <li><a href=errata24.html#nlink>Feb 25, 1999: An unbounded increment on the
1.90 deraadt 793: nlink value in FFS and EXT2FS filesystems can cause a system crash.
1.89 deraadt 794: (patch included).</a>
1.92 deraadt 795: <li><a href=errata24.html#ping>Feb 23, 1999: Yet another buffer overflow
1.88 deraadt 796: existed in ping(8). (patch included).</a>
1.92 deraadt 797: <li><a href=errata24.html#ipqrace>Feb 19, 1999: ipintr() had a race in use of
1.87 deraadt 798: the ipq, which could permit an attacker to cause a crash.
799: (patch included).</a>
1.92 deraadt 800: <li><a href=errata24.html#accept>Feb 17, 1999: A race condition in the
1.86 deraadt 801: kernel between accept(2) and select(2) could permit an attacker
802: to hang sockets from remote.
803: (patch included).</a>
1.92 deraadt 804: <li><a href=errata24.html#maxqueue>Feb 17, 1999: IP fragment assembly can
1.85 deraadt 805: bog the machine excessively and cause problems.
806: (patch included).</a>
1.92 deraadt 807: <li><a href=errata24.html#trctrap>Feb 12, 1999: i386 T_TRCTRAP handling and
1.84 deraadt 808: DDB interacted to possibly cause a crash.
809: (patch included).</a>
1.92 deraadt 810: <li><a href=errata24.html#rst>Feb 11, 1999: TCP/IP RST handling was sloppy.
1.83 deraadt 811: (patch included).</a>
1.92 deraadt 812: <li><a href=errata24.html#bootpd>Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 813: problem in bootpd(8). (patch included).</a>
1.92 deraadt 814: <li><a href=errata24.html#termcap>Nov 19, 1998: There is a possibly locally
1.82 deraadt 815: exploitable problem relating to environment variables in termcap
816: and curses. (patch included).</a>
1.92 deraadt 817: <li><a href=errata24.html#tcpfix>Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 818: bug in the TCP decoding kernel. (patch included).</a>
1.75 deraadt 819: </ul>
820:
1.106 deraadt 821: <p>
822: <li>
1.58 deraadt 823: <a name=23></a>
1.235 miod 824:
1.110 deraadt 825: <h3><font color=#e00000>OpenBSD 2.3 Security Advisories</font></h3>
1.73 deraadt 826: These are the OpenBSD 2.3 advisories -- all these problems are solved
827: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
828: OpenBSD 2.2 advisories listed below are fixed in OpenBSD 2.3.
1.53 matthieu 829:
1.96 deraadt 830: <p>
1.53 matthieu 831: <ul>
1.81 deraadt 832: <li><a href=errata23.html#bootpd>Nov 27, 1998: There is a remotely exploitable
833: problem in bootpd(8). (patch included).</a>
1.78 deraadt 834: <li><a href=errata23.html#tcpfix>Nov 13, 1998: There is a remote machine lockup
835: bug in the TCP decoding kernel. (patch included).</a>
1.190 mpech 836: <li><a href=errata23.html#resolver>August 31, 1998: A benign looking resolver
837: buffer overflow bug was re-introduced accidentally (patches included).</a>
838: <li><a href=errata23.html#chpass>Aug 2, 1998:
839: chpass(1) has a file descriptor leak which allows an
840: attacker to modify /etc/master.passwd.</a>
841: <li><a href=errata23.html#inetd>July 15, 1998: Inetd had a file descriptor leak.</a>
1.76 aaron 842: <li><a href=errata23.html#fdalloc>Jul 2, 1998: setuid and setgid processes
1.72 deraadt 843: should not be executed with fd slots 0, 1, or 2 free.
844: (patch included).</a>
1.76 aaron 845: <li><a href=errata23.html#xlib>June 6, 1998: Further problems with the X
1.71 deraadt 846: libraries (patches included).</a>
1.76 aaron 847: <li><a href=errata23.html#kill>May 17, 1998: kill(2) of setuid/setgid target
1.66 deraadt 848: processes too permissive (4th revision patch included).</a>
1.76 aaron 849: <li><a href=errata23.html#immutable>May 11, 1998: mmap() permits partial bypassing
1.60 deraadt 850: of immutable and append-only file flags. (patch included).</a>
1.190 mpech 851: <li><a href=errata23.html#ipsec>May 5, 1998: Incorrect handling of IPSEC packets
852: if IPSEC is enabled (patch included).</a>
1.76 aaron 853: <li><a href=errata23.html#xterm-xaw>May 1, 1998: Buffer overflow in xterm and Xaw
1.58 deraadt 854: (CERT advisory VB-98.04) (patch included).</a>
1.53 matthieu 855: </ul>
1.9 deraadt 856:
1.106 deraadt 857: <p>
858: <li>
1.58 deraadt 859: <a name=22></a>
1.235 miod 860:
1.110 deraadt 861: <h3><font color=#e00000>OpenBSD 2.2 Security Advisories</font></h3>
1.45 deraadt 862: These are the OpenBSD 2.2 advisories. All these problems are solved
1.55 deraadt 863: in <a href=23.html>OpenBSD 2.3</a>. Some of these problems
1.45 deraadt 864: still exist in other operating systems. (The supplied patches are for
865: OpenBSD 2.2; they may or may not work on OpenBSD 2.1).
1.9 deraadt 866:
1.96 deraadt 867: <p>
1.9 deraadt 868: <ul>
1.72 deraadt 869: <li><a href=errata22.html#ipsec>May 5, 1998: Incorrect handling of IPSEC
870: packets if IPSEC is enabled (patch included).</a>
871: <li><a href=errata22.html#xterm-xaw>May 1, 1998: Buffer overflow in xterm
872: and Xaw (CERT advisory VB-98.04) (patch included).</a>
873: <li><a href=errata22.html#uucpd>Apr 22, 1998: Buffer overflow in uucpd
874: (patch included).</a>
875: <li><a href=errata22.html#rmjob>Apr 22, 1998: Buffer mismanagement in lprm
876: (patch included).</a>
877: <li><a href=errata22.html#ping>Mar 31, 1998: Overflow in ping -R (patch included).</a>
878: <li><a href=errata22.html#named>Mar 30, 1998: Overflow in named fake-iquery
1.59 deraadt 879: (patch included).</a>
1.72 deraadt 880: <li><a href=errata22.html#mountd>Mar 2, 1998: Accidental NFS filesystem
881: export (patch included).</a>
1.112 philen 882: <li><a href="advisories/mmap.txt">Feb 26, 1998: Read-write mmap() flaw.</a>
1.72 deraadt 883: Revision 3 of the patch is available <a href=errata22.html#mmap>here</a>
1.112 philen 884: <li><a href="advisories/sourceroute.txt">Feb 19, 1998: Sourcerouted Packet
1.59 deraadt 885: Acceptance.</a>
1.50 deraadt 886: A patch is available <a href=errata22.html#sourceroute>here</a>.
1.122 rohee 887: <li><a href=errata22.html#ruserok>Feb 13, 1998: Setuid coredump & Ruserok()
1.72 deraadt 888: flaw (patch included).</a>
889: <li><a href=errata22.html#ldso>Feb 9, 1998: MIPS ld.so flaw (patch included).</a>
1.1 deraadt 890: </ul>
891:
1.106 deraadt 892: <p>
893: <li>
1.58 deraadt 894: <a name=21></a>
1.235 miod 895:
1.110 deraadt 896: <h3><font color=#e00000>OpenBSD 2.1 Security Advisories</font></h3>
1.52 deraadt 897: These are the OpenBSD 2.1 advisories. All these problems are solved
898: in <a href=22.html>OpenBSD 2.2</a>. Some of these problems still
899: exist in other operating systems. (If you are running OpenBSD 2.1, we
900: would strongly recommend an upgrade to the newest release, as this
901: patch list only attempts at fixing the most important security
902: problems. In particular, OpenBSD 2.2 fixes numerous localhost
903: security problems. Many of those problems were solved in ways which
904: make it hard for us to provide patches).
905:
1.96 deraadt 906: <p>
1.52 deraadt 907: <ul>
1.112 philen 908: <li><a href="advisories/signals.txt">Sep 15, 1997: Deviant Signals (patch included)</a>
909: <li><a href="advisories/rfork.txt">Aug 2, 1997: Rfork() system call flaw
1.59 deraadt 910: (patch included)</a>
1.112 philen 911: <li><a href="advisories/procfs.txt">Jun 24, 1997: Procfs flaws (patch included)</a>
1.52 deraadt 912: </ul>
1.51 deraadt 913:
1.106 deraadt 914: <p>
915: <li>
916: <a name=20></a>
1.235 miod 917:
1.110 deraadt 918: <h3><font color=#e00000>OpenBSD 2.0 Security Advisories</font></h3>
1.99 deraadt 919: These are the OpenBSD 2.0 advisories. All these problems are solved
920: in <a href=21.html>OpenBSD 2.1</a>. Some of these problems still
921: exist in other operating systems. (If you are running OpenBSD 2.0, we
922: commend you for being there back in the old days!, but you're really
923: missing out if you don't install a new version!)
924:
925: <p>
926: <ul>
1.112 philen 927: <li><a href="advisories/res_random.txt">April 22, 1997: Predictable IDs in the
1.99 deraadt 928: resolver (patch included)</a>
929: <li>Many others... if people can hunt them down, please let me know
930: and we'll put them up here.
931: </ul>
932:
1.106 deraadt 933: </dl>
1.51 deraadt 934: <p>
1.106 deraadt 935:
936: <a name=watching></a>
1.110 deraadt 937: <li><h3><font color=#e00000>Watching our Changes</font></h3><p>
1.106 deraadt 938:
1.21 deraadt 939: Since we take a proactive stance with security, we are continually
940: finding and fixing new security problems. Not all of these problems
1.80 espie 941: get widely reported because (as stated earlier) many of them are not
1.45 deraadt 942: confirmed to be exploitable; many simple bugs we fix do turn out to
943: have security consequences we could not predict. We do not have the
944: time resources to make these changes available in the above format.<p>
1.21 deraadt 945:
946: Thus there are usually minor security fixes in the current source code
947: beyond the previous major OpenBSD release. We make a limited
1.45 deraadt 948: guarantee that these problems are of minimal impact and unproven
1.44 ian 949: exploitability. If we discover that a problem definitely matters for
1.45 deraadt 950: security, patches will show up here <strong>VERY</strong> quickly.<p>
1.21 deraadt 951:
1.45 deraadt 952: People who are really concerned with security can do a number of
953: things:<p>
1.21 deraadt 954:
955: <ul>
956: <li>If you understand security issues, watch our
1.27 deraadt 957: <a href=mail.html>source-changes mailing list</a> and keep an
1.23 deraadt 958: eye out for things which appear security related. Since
1.21 deraadt 959: exploitability is not proven for many of the fixes we make,
960: do not expect the relevant commit message to say "SECURITY FIX!".
961: If a problem is proven and serious, a patch will be available
962: here very shortly after.
1.161 horacio 963: <li>In addition to source changes, you can watch our <a href="mail.html">
1.160 ericj 964: security-announce mailing list</a> which will notify you for every
1.186 ian 965: security related item that the OpenBSD team deems as a possible threat,
1.160 ericj 966: and instruct you on how to patch the problem.
1.21 deraadt 967: <li>Track our current source code tree, and teach yourself how to do a
1.29 deraadt 968: complete system build from time to time (read /usr/src/Makefile
969: carefully). Users can make the assumption that the current
970: source tree always has stronger security than the previous release.
1.45 deraadt 971: However, building your own system from source code is not trivial;
972: it is nearly 300MB of source code, and problems do occur as we
973: transition between major releases.
1.115 ericj 974: <li>Install a binary snapshot for your
1.80 espie 975: architecture, which are made available fairly often. For
1.29 deraadt 976: instance, an i386 snapshot is typically made available weekly.
1.21 deraadt 977: </ul>
978:
1.9 deraadt 979: <p>
1.153 jufi 980: <a name=reporting></a>
1.110 deraadt 981: <li><h3><font color=#e00000>Reporting problems</font></h3><p>
1.3 deraadt 982:
1.5 deraadt 983: <p> If you find a new security problem, you can mail it to
1.6 deraadt 984: <a href=mailto:deraadt@openbsd.org>deraadt@openbsd.org</a>.
1.7 deraadt 985: <br>
1.5 deraadt 986: If you wish to PGP encode it (but please only do so if privacy is very
1.112 philen 987: urgent, since it is inconvenient) use this <a href="advisories/pgpkey.txt">pgp key</a>.
1.5 deraadt 988:
1.107 deraadt 989: <p>
990: <a name=papers></a>
1.110 deraadt 991: <li><h3><font color=#e00000>Further Reading</font></h3><p>
1.107 deraadt 992:
993: A number of papers have been written by OpenBSD team members, about security
994: related changes they have done in OpenBSD. The postscript versions of these
1.108 deraadt 995: documents are available as follows.<p>
1.107 deraadt 996:
997: <ul>
1.113 deraadt 998: <li>A Future-Adaptable Password Scheme.<br>
1.118 deraadt 999: <a href=events.html#usenix99>Usenix 1999</a>,
1.153 jufi 1000: by <a href=mailto:provos@openbsd.org>Niels Provos</a>,
1.113 deraadt 1001: <a href=mailto:dm@openbsd.org>David Mazieres</a>.<br>
1.107 deraadt 1002: <a href=papers/bcrypt-paper.ps>paper</a> and
1003: <a href=papers/bcrypt-slides.ps>slides</a>.
1.113 deraadt 1004: <p>
1005: <li>Cryptography in OpenBSD: An Overview.<br>
1.118 deraadt 1006: <a href=events.html#usenix99>Usenix 1999</a>,
1.113 deraadt 1007: by <a href=mailto:deraadt@openbsd.org>Theo de Raadt</a>,
1008: <a href=mailto:niklas@openbsd.org>Niklas Hallqvist</a>,
1009: <a href=mailto:art@openbsd.org>Artur Grabowski</a>,
1010: <a href=mailto:angelos@openbsd.org>Angelos D. Keromytis</a>,
1011: <a href=mailto:provos@openbsd.org>Niels Provos</a>.<br>
1.107 deraadt 1012: <a href=papers/crypt-paper.ps>paper</a> and
1013: <a href=papers/crypt-slides.ps>slides</a>.
1.113 deraadt 1014: <p>
1015: <li>strlcpy and strlcat -- consistent, safe, string copy and concatenation.<br>
1.118 deraadt 1016: <a href=events.html#usenix99>Usenix 1999</a>,
1.113 deraadt 1017: by <a href=mailto:millert@openbsd.org>Todd C. Miller</a>,
1018: <a href=mailto:deraadt@openbsd.org>Theo de Raadt</a>.<br>
1.109 deraadt 1019: <a href=papers/strlcpy-paper.ps>paper</a> and
1020: <a href=papers/strlcpy-slides.ps>slides</a>.
1.113 deraadt 1021: <p>
1.118 deraadt 1022: <li>Dealing with Public Ethernet Jacks-Switches, Gateways, and Authentication.<br>
1023: <a href=events.html#lisa99>LISA 1999</a>,
1024: by <a href=mailto:beck@openbsd.org>Bob Beck</a>.<br>
1025: <a href=papers/authgw-paper.ps>paper</a> and
1026: <a href=papers/authgw-slides.ps>slides</a>.
1027: <p>
1.153 jufi 1028: <li>Encrypting Virtual Memory<br>
1.142 deraadt 1029: <a href=events.html#sec2000>Usenix Security 2000</a>,
1030: <a href=mailto:provos@openbsd.org>Niels Provos</a>.<br>
1.143 provos 1031: <a href=papers/swapencrypt.ps>paper</a> and
1032: <a href=papers/swapencrypt-slides.ps>slides</a>.
1.142 deraadt 1033: <p>
1.107 deraadt 1034: </ul>
1035:
1.106 deraadt 1036: </dl>
1037:
1.2 deraadt 1038: <hr>
1.68 pauls 1039: <a href=index.html><img height=24 width=24 src=back.gif border=0 alt=OpenBSD></a>
1.24 deraadt 1040: <a href=mailto:www@openbsd.org>www@openbsd.org</a>
1041: <br>
1.243 ! deraadt 1042: <small>$OpenBSD: security.html,v 1.242 2003/03/24 19:21:05 millert Exp $</small>
1.1 deraadt 1043:
1.24 deraadt 1044: </body>
1045: </html>
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