Annotation of www/security.html, Revision 1.244
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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>
1.244 ! miod 199: <li><a href=errata32.html#sendmail2>March 31, 2003:
! 200: A buffer overflow in the address parsing in
! 201: sendmail(8) may allow an attacker to gain root privileges.</a>
1.243 deraadt 202: <li><a href=errata32.html#kerberos>March 24, 2003:
1.242 millert 203: A cryptographic weaknesses in the Kerberos v4 protocol can be
204: exploited on Kerberos v5 as well.</a>
1.243 deraadt 205: <li><a href=errata32.html#kpr>March 19, 2003:
1.241 jufi 206: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 207: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.243 deraadt 208: <li><a href=errata32.html#blinding>March 18, 2003:
1.239 miod 209: Various SSL and TLS operations in OpenSSL are vulnerable to
210: timing attacks.</a>
1.243 deraadt 211: <li><a href=errata32.html#lprm>March 5, 2003:
1.238 millert 212: A buffer overflow in lprm(1) may allow an attacker to elevate
213: privileges to user daemon.</a>.
1.243 deraadt 214: <li><a href=errata32.html#sendmail>March 3, 2003:
1.237 miod 215: A buffer overflow in the envelope comments processing in
216: sendmail(8) may allow an attacker to gain root privileges.</a>
1.243 deraadt 217: <li><a href=errata32.html#httpd>February 25, 2003:
1.236 margarid 218: httpd(8) leaks file inode numbers via ETag header as well as
219: child PIDs in multipart MIME boundary generation. This could
220: lead, for example, to NFS exploitation because it uses inode
221: numbers as part of the file handle.</a>
1.243 deraadt 222: <li><a href=errata32.html#ssl>February 22, 2003:
1.234 margarid 223: In ssl(8) an information leak can occur via timing by performing
224: a MAC computation even if incorrect block cipher padding has
225: been found, this is a countermeasure. Also, check for negative
226: sizes, in allocation routines.</a>
1.243 deraadt 227: <li><a href=errata32.html#cvs>January 20, 2003:
1.232 millert 228: A double free exists in cvs(1) that could lead to privilege
229: escalation for cvs configurations where the cvs command is
1.233 margarid 230: run as a privileged user.</a>
1.243 deraadt 231: <li><a href=errata32.html#named>November 14, 2002:
1.230 millert 232: A buffer overflow exists in named(8) that could lead to a
233: remote crash or code execution as user named in a chroot jail.</a>
1.243 deraadt 234: <li><a href=errata32.html#pool>November 6, 2002:
1.233 margarid 235: A logic error in the pool kernel memory allocator could cause
236: memory corruption in low-memory situations, causing the system
237: to crash.</a>
1.243 deraadt 238: <li><a href=errata32.html#smrsh>November 6, 2002:
1.229 miod 239: An attacker can bypass smrsh(8)'s restrictions and execute
240: arbitrary commands with the privileges of his own account.</a>
1.243 deraadt 241: <li><a href=errata32.html#pfbridge>November 6, 2002:
1.233 margarid 242: Network bridges running pf with scrubbing enabled could cause
243: mbuf corruption, causing the system to crash.</a>
1.243 deraadt 244: <li><a href=errata32.html#kadmin>October 21, 2002:
1.228 miod 245: A buffer overflow can occur in the kadmind(8) daemon, leading
246: to possible remote crash or exploit.</a>
1.224 deraadt 247: </ul>
248:
1.227 miod 249: <p>
250: <li>
1.203 deraadt 251: <a name=31></a>
252:
253: <h3><font color=#e00000>OpenBSD 3.1 Security Advisories</font></h3>
254: These are the OpenBSD 3.1 advisories -- all these problems are solved
255: in <a href=anoncvs.html>OpenBSD current</a> and the
256: <a href=stable.html>patch branch</a>.
257:
258: <p>
259: <ul>
1.244 ! miod 260: <li><a href=errata31.html#sendmail2>March 31, 2003:
! 261: A buffer overflow in the address parsing in
! 262: sendmail(8) may allow an attacker to gain root privileges.</a>
1.242 millert 263: <li><a href=errata31.html#kerberos>March 24, 2003:
264: A cryptographic weaknesses in the Kerberos v4 protocol can be
265: exploited on Kerberos v5 as well.</a>
1.240 miod 266: <li><a href=errata31.html#kpr>March 19, 2003:
1.241 jufi 267: OpenSSL is vulnerable to an extension of the ``Bleichenbacher'' attack
1.240 miod 268: designed by Czech researchers Klima, Pokorny and Rosa.</a>
1.239 miod 269: <li><a href=errata31.html#blinding>March 18, 2003:
270: Various SSL and TLS operations in OpenSSL are vulnerable to
271: timing attacks.</a>
1.238 millert 272: <li><a href=errata31.html#lprm>March 4, 2003:
273: A buffer overflow in lprm(1) may allow an attacker to gain
274: root privileges.</a>
1.237 miod 275: <li><a href=errata31.html#sendmail>March 3, 2003:
276: A buffer overflow in the envelope comments processing in
277: sendmail(8) may allow an attacker to gain root privileges.</a>
1.235 miod 278: <li><a href=errata31.html#ssl2>February 23, 2003:
279: In ssl(8) an information leak can occur via timing by performing
280: a MAC computation even if incorrect block cipher padding has
281: been found, this is a countermeasure. Also, check for negative
282: sizes, in allocation routines.</a>
1.232 millert 283: <li><a href=errata31.html#cvs>January 20, 2003:
284: A double free exists in cvs(1) that could lead to privilege
285: escalation for cvs configurations where the cvs command is
286: run as a privileged user.
1.230 millert 287: <li><a href=errata31.html#named>November 14, 2002:
288: A buffer overflow exists in named(8) that could lead to a
289: remote crash or code execution as user named in a chroot jail.</a>
1.229 miod 290: <li><a href=errata31.html#kernresource>November 6, 2002:
291: Incorrect argument checking in the getitimer(2) system call
292: may allow an attacker to crash the system.</a>
293: <li><a href=errata31.html#smrsh>November 6, 2002:
294: An attacker can bypass smrsh(8)'s restrictions and execute
295: arbitrary commands with the privileges of his own account.</a>
1.226 miod 296: <li><a href=errata31.html#kadmin>October 21, 2002:
297: A buffer overflow can occur in the kadmind(8) daemon, leading
298: to possible remote crash or exploit.</a>
1.224 deraadt 299: <li><a href=errata31.html#kerntime>October 2, 2002:
1.222 jason 300: Incorrect argument checking in the setitimer(2) system call
301: may allow an attacker to write to kernel memory.</a>
1.224 deraadt 302: <li><a href=errata31.html#scarg>August 11, 2002:
1.221 provos 303: An insufficient boundary check in the select system call
1.220 miod 304: allows an attacker to overwrite kernel memory and execute arbitrary code
305: in kernel context.</a>
1.224 deraadt 306: <li><a href=errata31.html#ssl>July 30, 2002:
1.218 miod 307: Several remote buffer overflows can occur in the SSL2 server and SSL3
308: client of the ssl(8) library, as in the ASN.1 parser code in the
309: crypto(3) library, all of them being potentially remotely
310: exploitable.</a>
1.224 deraadt 311: <li><a href=errata31.html#xdr>July 29, 2002:
1.218 miod 312: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
313: possible remote crash.</a>
1.224 deraadt 314: <li><a href=errata31.html#pppd>July 29, 2002:
1.218 miod 315: A race condition exists in the pppd(8) daemon which may cause it to
316: alter the file permissions of an arbitrary file.</a>
1.224 deraadt 317: <li><a href=errata31.html#isakmpd>July 5, 2002:
1.218 miod 318: Receiving IKE payloads out of sequence can cause isakmpd(8) to
319: crash.</a>
1.224 deraadt 320: <li><a href=errata31.html#ktrace>June 27, 2002:
1.215 miod 321: The kernel would let any user ktrace set[ug]id processes.</a>
1.224 deraadt 322: <li><a href=errata31.html#modssl>June 26, 2002:
1.213 miod 323: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 324: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.224 deraadt 325: <li><a href=errata31.html#resolver>June 25, 2002:
1.212 millert 326: A potential buffer overflow in the DNS resolver has been found.</a>
1.224 deraadt 327: <li><a href=errata31.html#sshd>June 24, 2002:
1.216 deraadt 328: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 329: input validation error that can result in an integer overflow and
330: privilege escalation.</a>
1.224 deraadt 331: <li><a href=errata31.html#httpd>June 19, 2002:
1.211 miod 332: A buffer overflow can occur during the interpretation of chunked
333: encoding in httpd(8), leading to possible remote crash.</a>
1.224 deraadt 334: <li><a href=errata31.html#sshbsdauth>May 22, 2002:
1.209 markus 335: Under certain conditions, on systems using YP with netgroups
336: in the password database, it is possible that sshd(8) does
337: ACL checks for the requested user name but uses the password
338: database entry of a different user for authentication. This
339: means that denied users might authenticate successfully
340: while permitted users could be locked out.</a>
1.224 deraadt 341: <li><a href=errata31.html#fdalloc2>May 8, 2002:
1.208 millert 342: A race condition exists that could defeat the kernel's
343: protection of fd slots 0-2 for setuid processes.</a>
1.224 deraadt 344: <li><a href=errata31.html#sudo>April 25, 2002:
1.205 millert 345: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.224 deraadt 346: <li><a href=errata31.html#sshafs>April 22, 2002:
1.205 millert 347: A local user can gain super-user privileges due to a buffer
348: overflow in sshd(8) if AFS has been configured on the system
349: or if KerberosTgtPassing or AFSTokenPassing has been enabled
350: in the sshd_config file.</a>
1.203 deraadt 351: </ul>
352:
1.235 miod 353: </dl>
1.203 deraadt 354: <p>
1.235 miod 355: OpenBSD 3.0 and earlier releases are not supported anymore. The following
356: paragraphs only list advisories issued while they were maintained; these
357: releases are likely to be affected by the advisories for more recent releases.
358: <br>
1.203 deraadt 359:
1.235 miod 360: <p>
361: <dl>
362:
363: <p>
1.203 deraadt 364: <li>
1.187 deraadt 365: <a name=30></a>
366:
367: <h3><font color=#e00000>OpenBSD 3.0 Security Advisories</font></h3>
368: These are the OpenBSD 3.0 advisories -- all these problems are solved
369: in <a href=anoncvs.html>OpenBSD current</a> and the
370: <a href=stable.html>patch branch</a>.
371:
372: <p>
373: <ul>
1.230 millert 374: <li><a href=errata30.html#named>November 14, 2002:
375: A buffer overflow exists in named(8) that could lead to a
376: remote crash or code execution as user named in a chroot jail.</a>
1.229 miod 377: <li><a href=errata30.html#kernresource>November 6, 2002:
378: Incorrect argument checking in the getitimer(2) system call
379: may allow an attacker to crash the system.</a>
380: <li><a href=errata30.html#smrsh>November 6, 2002:
381: An attacker can bypass smrsh(8)'s restrictions and execute
382: arbitrary commands with the privileges of his own account.</a>
1.226 miod 383: <li><a href=errata30.html#kadmin>October 21, 2002:
384: A buffer overflow can occur in the kadmind(8) daemon, leading
385: to possible remote crash or exploit.</a>
1.223 miod 386: <li><a href=errata30.html#kerntime>October 7, 2002:
387: Incorrect argument checking in the setitimer(2) system call
388: may allow an attacker to write to kernel memory.</a>
1.220 miod 389: <li><a href=errata30.html#scarg>August 11, 2002:
390: An insufficient boundary check in the select and poll system calls
391: allows an attacker to overwrite kernel memory and execute arbitrary code
392: in kernel context.</a>
1.218 miod 393: <li><a href=errata30.html#ssl>July 30, 2002:
394: Several remote buffer overflows can occur in the SSL2 server and SSL3
395: client of the ssl(8) library, as in the ASN.1 parser code in the
396: crypto(3) library, all of them being potentially remotely
397: exploitable.</a>
398: <li><a href=errata30.html#xdr>July 29, 2002:
399: A buffer overflow can occur in the xdr_array(3) RPC code, leading to
400: possible remote crash.</a>
401: <li><a href=errata30.html#pppd>July 29, 2002:
402: A race condition exists in the pppd(8) daemon which may cause it to
403: alter the file permissions of an arbitrary file.</a>
1.219 miod 404: <li><a href=errata30.html#isakmpd2>July 5, 2002:
1.218 miod 405: Receiving IKE payloads out of sequence can cause isakmpd(8) to
406: crash.</a>
1.215 miod 407: <li><a href=errata30.html#ktrace>June 27, 2002:
408: The kernel would let any user ktrace set[ug]id processes.</a>
1.212 millert 409: <li><a href=errata30.html#resolver>June 25, 2002:
410: A potential buffer overflow in the DNS resolver has been found.</a>
1.213 miod 411: <li><a href=errata30.html#sshdauth>June 24, 2002:
1.216 deraadt 412: All versions of OpenSSH's sshd between 2.3.1 and 3.3 contain an
1.213 miod 413: input validation error that can result in an integer overflow and
414: privilege escalation.</a>
415: <li><a href=errata30.html#modssl>June 24, 2002:
416: A buffer overflow can occur in the .htaccess parsing code in
1.214 miod 417: mod_ssl httpd module, leading to possible remote crash or exploit.</a>
1.213 miod 418: <li><a href=errata30.html#httpd>June 19, 2002:
419: A buffer overflow can occur during the interpretation of chunked
420: encoding in httpd(8), leading to possible remote crash.</a>
1.208 millert 421: <li><a href=errata30.html#fdalloc2>May 8, 2002:
422: A race condition exists that could defeat the kernel's
423: protection of fd slots 0-2 for setuid processes.</a>
1.205 millert 424: <li><a href=errata30.html#sudo2>April 25, 2002:
425: A bug in sudo may allow an attacker to corrupt the heap.</a>
426: <li><a href=errata30.html#sshafs>April 22, 2002:
427: A local user can gain super-user privileges due to a buffer
428: overflow in sshd(8) if AFS has been configured on the system
429: or if KerberosTgtPassing or AFSTokenPassing has been enabled
430: in the sshd_config file.</a>
1.203 deraadt 431: <li><a href=errata30.html#mail>April 11, 2002:
1.202 millert 432: The mail(1) was interpreting tilde escapes even when invoked
433: in non-interactive mode. As mail(1) is called as root from cron,
434: this can lead to a local root compromise.</a>
1.203 deraadt 435: <li><a href=errata30.html#approval>March 19, 2002:
1.201 millert 436: Under certain conditions, on systems using YP with netgroups in
437: the password database, it is possible for the rexecd(8) and rshd(8)
438: daemons to execute a shell from a password database entry for a
439: different user. Similarly, atrun(8) may change to the wrong
440: home directory when running jobs.</a>
1.203 deraadt 441: <li><a href=errata30.html#zlib>March 13, 2002:
1.200 millert 442: A potential double free() exists in the zlib library;
443: this is not exploitable on OpenBSD.
444: The kernel also contains a copy of zlib; it is not
445: currently known if the kernel zlib is exploitable.</a>
1.203 deraadt 446: <li><a href=errata30.html#openssh>March 8, 2002:
1.198 millert 447: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 448: may allow a local user to gain super-user privileges.</a>
1.203 deraadt 449: <li><a href=errata30.html#ptrace>January 21, 2002:
1.192 jason 450: A race condition between the ptrace(2) and execve(2) system calls
451: allows an attacker to modify the memory contents of suid/sgid
452: processes which could lead to compromise of the super-user account.</a>
1.203 deraadt 453: <li><a href=errata30.html#sudo>January 17, 2002:
1.191 millert 454: There is a security hole in sudo(8) that can be exploited
455: when the Postfix sendmail replacement is installed that may
456: allow an attacker on the local host to gain root privileges.</a>
1.203 deraadt 457: <li><a href=errata30.html#lpd>November 28, 2001:
1.189 millert 458: An attacker can trick a machine running the lpd daemon into
459: creating new files in the root directory from a machine with
460: remote line printer access.</a>
1.203 deraadt 461: <li><a href=errata30.html#vi.recover>November 13, 2001:
1.188 millert 462: The vi.recover script can be abused in such a way as
463: to cause arbitrary zero-length files to be removed.</a>
1.203 deraadt 464: <li><a href=errata30.html#pf>November 13, 2001:
1.190 mpech 465: pf(4) was incapable of dealing with certain ipv6 icmp packets,
466: resulting in a crash.</a>
1.203 deraadt 467: <li><a href=errata30.html#sshd>November 12, 2001:
1.190 mpech 468: A security hole that may allow an attacker to partially authenticate
469: if -- and only if -- the administrator has enabled KerberosV.</a>
1.187 deraadt 470: </ul>
471:
472: <p>
473: <li>
1.173 deraadt 474: <a name=29></a>
475:
476: <h3><font color=#e00000>OpenBSD 2.9 Security Advisories</font></h3>
477: These are the OpenBSD 2.9 advisories -- all these problems are solved
478: in <a href=anoncvs.html>OpenBSD current</a> and the
1.179 jufi 479: <a href=stable.html>patch branch</a>.
1.173 deraadt 480:
481: <p>
482: <ul>
1.212 millert 483: <li><a href=errata29.html#resolver>June 25, 2002:
484: A potential buffer overflow in the DNS resolver has been found.</a>
1.208 millert 485: <li><a href=errata29.html#fdalloc2>May 8, 2002:
486: A race condition exists that could defeat the kernel's
487: protection of fd slots 0-2 for setuid processes.</a>
1.207 millert 488: <li><a href=errata29.html#sudo2>April 25, 2002:
489: A bug in sudo may allow an attacker to corrupt the heap.</a>
1.206 millert 490: <li><a href=errata29.html#sshafs>April 22, 2002:
491: A local user can gain super-user privileges due to a buffer
492: overflow in sshd(8) if AFS has been configured on the system
493: or if KerberosTgtPassing or AFSTokenPassing has been enabled
494: in the sshd_config file.</a>
1.202 millert 495: <li><a href=errata29.html#mail>April 11, 2002:
496: The mail(1) was interpreting tilde escapes even when invoked
497: in non-interactive mode. As mail(1) is called as root from cron,
498: this can lead to a local root compromise.</a>
1.200 millert 499: <li><a href=errata29.html#zlib>March 13, 2002:
500: A potential double free() exists in the zlib library;
501: this is not exploitable on OpenBSD.
502: The kernel also contains a copy of zlib; it is not
503: currently known if the kernel zlib is exploitable.</a>
1.198 millert 504: <li><a href=errata29.html#openssh>March 8, 2002:
505: An off-by-one check in OpenSSH's channel forwarding code
1.199 jufi 506: may allow a local user to gain super-user privileges.</a>
1.198 millert 507: <li><a href=errata29.html#ptrace>January 21, 2002:
508: A race condition between the ptrace(2) and execve(2) system calls
509: allows an attacker to modify the memory contents of suid/sgid
510: processes which could lead to compromise of the super-user account.</a>
1.191 millert 511: <li><a href=errata29.html#sudo>January 17, 2002:
512: There is a security hole in sudo(8) that can be exploited
513: when the Postfix sendmail replacement is installed that may
514: allow an attacker on the local host to gain root privileges.</a>
1.189 millert 515: <li><a href=errata29.html#lpd2>November 28, 2001:
516: An attacker can trick a machine running the lpd daemon into
517: creating new files in the root directory from a machine with
518: remote line printer access.</a>
1.190 mpech 519: <li><a href=errata29.html#vi.recover>November 13, 2001:
520: The vi.recover script can be abused in such a way as
521: to cause arbitrary zero-length files to be removed.</a>
1.185 deraadt 522: <li><a href=errata29.html#uucp>September 11, 2001:
1.184 millert 523: A security hole exists in uuxqt(8) that may allow an
524: attacker to gain root privileges.</a>
1.185 deraadt 525: <li><a href=errata29.html#lpd>August 29, 2001:
1.183 millert 526: A security hole exists in lpd(8) that may allow an
527: attacker to gain root privileges if lpd is running.</a>
1.185 deraadt 528: <li><a href=errata29.html#sendmail2>August 21, 2001:
1.181 millert 529: A security hole exists in sendmail(8) that may allow an
530: attacker on the local host to gain root privileges.</a>
1.185 deraadt 531: <li><a href=errata29.html#nfs>July 30, 2001:
1.180 jason 532: A kernel buffer overflow in the NFS code can be used to execute
533: arbitrary code by users with mount privileges (only root by
1.181 millert 534: default).</a>
1.185 deraadt 535: <li><a href=errata29.html#kernexec>June 15, 2001:
1.178 aaron 536: A race condition in the kernel can lead to local root compromise.</a>
1.185 deraadt 537: <li><a href=errata29.html#sshcookie>June 12, 2001:
1.177 markus 538: sshd(8) allows users to delete arbitrary files named "cookies"
539: if X11 forwarding is enabled. X11 forwarding is disabled
540: by default.</a>
1.185 deraadt 541: <li><a href=errata29.html#fts>May 30, 2001:
1.176 millert 542: Programs using the fts routines can be tricked into changing
543: into the wrong directory.</a>
1.185 deraadt 544: <li><a href=errata29.html#sendmail>May 29, 2001:
1.174 millert 545: Sendmail signal handlers contain unsafe code,
546: leading to numerous race conditions.</a>
1.173 deraadt 547: </ul>
548:
549: <p>
550: <li>
1.152 deraadt 551: <a name=28></a>
552:
553: <h3><font color=#e00000>OpenBSD 2.8 Security Advisories</font></h3>
554: These are the OpenBSD 2.8 advisories -- all these problems are solved
1.154 millert 555: in <a href=anoncvs.html>OpenBSD current</a> and the
1.179 jufi 556: <a href=stable.html>patch branch</a>.
1.152 deraadt 557:
558: <p>
559: <ul>
1.184 millert 560: <li><a href=errata28.html#uucp>September 11, 2001:
561: A security hole exists in uuxqt(8) that may allow an
562: attacker to gain root privileges.</a>
1.183 millert 563: <li><a href=errata28.html#lpd>August 29, 2001:
564: A security hole exists in lpd(8) that may allow an
565: attacker to gain root privileges if lpd is running.</a>
1.181 millert 566: <li><a href=errata28.html#sendmail2>August 21, 2001:
567: A security hole exists in sendmail(8) that may allow an
568: attacker on the local host to gain root privileges.</a>
1.178 aaron 569: <li><a href=errata28.html#kernexec>June 15, 2001:
570: A race condition in the kernel can lead to local root compromise.</a>
1.176 millert 571: <li><a href=errata28.html#fts>May 30, 2001:
572: Programs using the fts routines can be tricked into changing
573: into the wrong directory.</a>
1.175 millert 574: <li><a href=errata28.html#sendmail>May 29, 2001:
575: Sendmail signal handlers contain unsafe code,
576: leading to numerous race conditions.</a>
1.173 deraadt 577: <li><a href=errata28.html#ipf_frag>Apr 23, 2001:
1.231 mickey 578: IPF contains a serious bug with its handling of fragment caching.</a>
1.173 deraadt 579: <li><a href=errata28.html#glob_limit>Apr 23, 2001:
1.172 ericj 580: ftpd(8) contains a potential DoS relating to glob(3).</a>
1.173 deraadt 581: <li><a href=errata28.html#glob>Apr 10, 2001:
1.170 ericj 582: The glob(3) library call contains multiple buffer overflows.</a>
1.173 deraadt 583: <li><a href=errata28.html#readline>Mar 18, 2001:
1.169 millert 584: The readline library creates history files with permissive modes based on the user's umask.</a>
1.173 deraadt 585: <li><a href=errata28.html#ipsec_ah>Mar 2, 2001:
1.167 ericj 586: Insufficient checks in the IPSEC AH IPv4 option handling code can lead to a buffer overrun in the kernel.</a>
1.173 deraadt 587: <li><a href=errata28.html#userldt>Mar 2, 2001:
1.168 horacio 588: The <b>USER_LDT</b> kernel option allows an attacker to gain access to privileged areas of kernel memory.</a>
1.173 deraadt 589: <li><a href=errata28.html#sudo>Feb 22, 2001:
1.171 millert 590: a non-exploitable buffer overflow was fixed in sudo(8).</a>
1.173 deraadt 591: <li><a href=errata28.html#named>Jan 29, 2001:
1.163 jason 592: merge named(8) with ISC BIND 4.9.8-REL, which fixes some buffer vulnerabilities.</a>
1.173 deraadt 593: <li><a href=errata28.html#rnd>Jan 22, 2001:
1.162 jason 594: rnd(4) did not use all of its input when written to.</a>
1.173 deraadt 595: <li><a href=errata28.html#xlock>Dec 22, 2000:
1.159 ericj 596: xlock(1)'s authentication was re-done to authenticate via a named pipe. (patch and new xlock binaries included).</a>
1.173 deraadt 597: <li><a href=errata28.html#procfs>Dec 18, 2000:
1.157 ericj 598: Procfs contains numerous overflows. Procfs is not used by default in OpenBSD. (patch included).</a>
1.173 deraadt 599: <li><a href=errata28.html#kerberos2>Dec 10, 2000:
1.156 deraadt 600: Another problem exists in KerberosIV libraries (patch included).</a>
1.173 deraadt 601: <li><a href=errata28.html#kerberos>Dec 7, 2000:
1.155 deraadt 602: A set of problems in KerberosIV exist (patch included).</a>
1.173 deraadt 603: <li><a href=errata28.html#ftpd>Dec 4, 2000:
1.154 millert 604: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.152 deraadt 605: </ul>
606:
607: <p>
608: <li>
1.124 deraadt 609: <a name=27></a>
610:
611: <h3><font color=#e00000>OpenBSD 2.7 Security Advisories</font></h3>
612: These are the OpenBSD 2.7 advisories -- all these problems are solved
613: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
614: OpenBSD 2.6 advisories listed below are fixed in OpenBSD 2.7.
615:
616: <p>
617: <ul>
1.169 millert 618: <li><a href=errata27.html#readline>Mar 18, 2001:
619: The readline library creates history files with permissive modes based on the user's umask.</a>
620: <li><a href=errata27.html#sudo>Feb 22, 2001:
621: a buffer overflow was fixed in sudo(8).</a>
1.154 millert 622: <li><a href=errata27.html#ftpd>Dec 4, 2000:
623: A single-byte buffer overflow exists in ftpd (patch included).</a>
1.152 deraadt 624: <li><a href=errata27.html#sshforwarding>Nov 10, 2000:
625: Hostile servers can force OpenSSH clients to do agent or X11 forwarding.
626: (patch included)</a>
627: <li><a href=errata27.html#xtrans>Oct 26, 2000:
1.151 matthieu 628: X11 libraries have 2 potential overflows in xtrans code.
629: (patch included)</a>
1.152 deraadt 630: <li><a href=errata27.html#httpd>Oct 18, 2000:
1.150 beck 631: Apache mod_rewrite and mod_vhost_alias modules could expose files
632: on the server in certain configurations if used.
633: (patch included)</a>
1.164 deraadt 634: <li><a href=errata27.html#telnetd>Oct 10, 2000:
1.149 millert 635: The telnet daemon does not strip out the TERMINFO, TERMINFO_DIRS,
636: TERMPATH and TERMCAP environment variables as it should.
637: (patch included)</a>
1.152 deraadt 638: <li><a href=errata27.html#format_strings>Oct 6, 2000:
1.148 millert 639: There are printf-style format string bugs in several privileged
640: programs. (patch included)</a>
1.152 deraadt 641: <li><a href=errata27.html#curses>Oct 6, 2000:
1.147 millert 642: libcurses honored terminal descriptions in the $HOME/.terminfo
643: directory as well as in the TERMCAP environment variable for
644: setuid and setgid applications.
1.146 deraadt 645: (patch included)</a>
1.152 deraadt 646: <li><a href=errata27.html#talkd>Oct 6, 2000:
1.146 deraadt 647: A format string vulnerability exists in talkd(8).
648: (patch included)</a>
1.152 deraadt 649: <li><a href=errata27.html#pw_error>Oct 3, 2000:
1.145 aaron 650: A format string vulnerability exists in the pw_error() function of the
651: libutil library, yielding localhost root through chpass(1).
652: (patch included)</a>
1.152 deraadt 653: <li><a href=errata27.html#ipsec>Sep 18, 2000:
1.144 jason 654: Bad ESP/AH packets could cause a crash under certain conditions.
655: (patch included)</a>
1.152 deraadt 656: <li><a href=errata27.html#xlock>Aug 16, 2000:
1.141 deraadt 657: A format string vulnerability (localhost root) exists in xlock(1).
658: (patch included)</a>
1.152 deraadt 659: <li><a href=errata27.html#X11_libs>July 14, 2000:
1.139 deraadt 660: Various bugs found in X11 libraries have various side effects, almost
661: completely denial of service in OpenBSD.
662: (patch included)</a>
1.152 deraadt 663: <li><a href=errata27.html#ftpd>July 5, 2000:
1.136 deraadt 664: Just like pretty much all the other unix ftp daemons
665: on the planet, ftpd had a remote root hole in it.
666: Luckily, ftpd was not enabled by default.
1.137 deraadt 667: The problem exists if anonymous ftp is enabled.
1.136 deraadt 668: (patch included)</a>
1.152 deraadt 669: <li><a href=errata27.html#mopd>July 5, 2000:
1.136 deraadt 670: Mopd, very rarely used, contained some buffer overflows.
671: (patch included)</a>
1.152 deraadt 672: <li><a href=errata27.html#libedit>June 28, 2000:
1.135 deraadt 673: libedit would check for a <b>.editrc</b> file in the current
674: directory. Not known to be a real security issue, but a patch
675: is available anyways.
676: (patch included)</a>
1.152 deraadt 677: <li><a href=errata27.html#dhclient>June 24, 2000:
1.134 deraadt 678: A serious bug in dhclient(8) could allow strings from a
679: malicious dhcp server to be executed in the shell as root.
680: (patch included)</a>
1.152 deraadt 681: <li><a href=errata27.html#isakmpd>June 9, 2000:
1.133 deraadt 682: A serious bug in isakmpd(8) policy handling wherein
683: policy verification could be completely bypassed in isakmpd.
684: (patch included)</a>
1.152 deraadt 685: <li><a href=errata27.html#uselogin>June 6, 2000:
1.132 deraadt 686: The non-default flag UseLogin in <b>/etc/sshd_config</b> is broken,
687: should not be used, and results in security problems on
688: other operating systems.</a>
1.152 deraadt 689: <li><a href=errata27.html#bridge>May 26, 2000:
1.129 deraadt 690: The bridge(4) <i>learning</i> flag may be bypassed.
1.128 deraadt 691: (patch included)</a>
1.152 deraadt 692: <li><a href=errata27.html#ipf>May 25, 2000:
1.127 kjell 693: Improper use of ipf <i>keep-state</i> rules can result
694: in firewall rules being bypassed. (patch included)</a>
695:
1.124 deraadt 696: </ul>
697:
698: <p>
699: <li>
1.119 deraadt 700: <a name=26></a>
701:
702: <h3><font color=#e00000>OpenBSD 2.6 Security Advisories</font></h3>
703: These are the OpenBSD 2.6 advisories -- all these problems are solved
704: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
705: OpenBSD 2.5 advisories listed below are fixed in OpenBSD 2.6.
706:
707: <p>
708: <ul>
1.130 deraadt 709: <li><a href=errata26.html#semconfig>May 26, 2000:
710: SYSV semaphore support contained an undocumented system call
1.131 deraadt 711: which could wedge semaphore-using processes from exiting. (patch included)</a>
1.127 kjell 712: <li><a href=errata26.html#ipf>May 25, 2000:
713: Improper use of ipf <i>keep-state</i> rules can result
714: in firewall rules being bypassed. (patch included)</a>
1.126 deraadt 715: <li><a href=errata26.html#xlockmore>May 25, 2000:
1.125 deraadt 716: xlockmore has a bug which a localhost attacker can use to gain
717: access to the encrypted root password hash (which is normally
718: encoded using blowfish (see
719: <a href="http://www.openbsd.org/cgi-bin/man.cgi?query=crypt&sektion=3">
720: crypt(3)</a>)
721: (patch included).</a>
1.126 deraadt 722: <li><a href=errata26.html#procfs>Jan 20, 2000:
1.123 deraadt 723: Systems running with procfs enabled and mounted are
724: vulnerable to a very tricky exploit. procfs is not
725: mounted by default.
726: (patch included).</a>
1.190 mpech 727: <li><a href=errata26.html#sendmail>Dec 4, 1999:
728: Sendmail permitted any user to cause a aliases file wrap,
729: thus exposing the system to a race where the aliases file
730: did not exist.
1.119 deraadt 731: (patch included).</a>
1.190 mpech 732: <li><a href=errata26.html#poll>Dec 4, 1999:
733: Various bugs in poll(2) may cause a kernel crash.</a>
1.126 deraadt 734: <li><a href=errata26.html#sslUSA>Dec 2, 1999:
1.120 deraadt 735: A buffer overflow in the RSAREF code included in the
736: USA version of libssl, is possibly exploitable in
737: httpd, ssh, or isakmpd, if SSL/RSA features are enabled.
1.124 deraadt 738: (patch included).<br></a>
739: <strong>Update:</strong> Turns out that this was not exploitable
740: in any of the software included in OpenBSD 2.6.
1.190 mpech 741: <li><a href=errata26.html#ifmedia>Nov 9, 1999:
742: Any user could change interface media configurations, resulting in
743: a localhost denial of service attack.
1.121 deraadt 744: (patch included).</a>
1.119 deraadt 745: </ul>
746:
747: <p>
748: <li>
1.93 deraadt 749: <a name=25></a>
1.106 deraadt 750:
1.110 deraadt 751: <h3><font color=#e00000>OpenBSD 2.5 Security Advisories</font></h3>
1.93 deraadt 752: These are the OpenBSD 2.5 advisories -- all these problems are solved
753: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
754: OpenBSD 2.4 advisories listed below are fixed in OpenBSD 2.5.
755:
1.96 deraadt 756: <p>
1.104 deraadt 757: <ul>
1.117 deraadt 758: <li><a href=errata25.html#cron>Aug 30, 1999:
1.103 deraadt 759: In cron(8), make sure argv[] is NULL terminated in the
760: fake popen() and run sendmail as the user, not as root.
761: (patch included).</a>
1.117 deraadt 762: <li><a href=errata25.html#miscfs>Aug 12, 1999: The procfs and fdescfs
1.101 deraadt 763: filesystems had an overrun in their handling of uio_offset
764: in their readdir() routines. (These filesystems are not
765: enabled by default). (patch included).</a>
1.117 deraadt 766: <li><a href=errata25.html#profil>Aug 9, 1999: Stop profiling (see profil(2))
1.100 deraadt 767: when we execve() a new process. (patch included).</a>
1.117 deraadt 768: <li><a href=errata25.html#ipsec_in_use>Aug 6, 1999: Packets that should have
1.98 deraadt 769: been handled by IPsec may be transmitted as cleartext.
770: PF_KEY SA expirations may leak kernel resources.
771: (patch included).</a>
1.117 deraadt 772: <li><a href=errata25.html#rc>Aug 5, 1999: In /etc/rc, use mktemp(1) for
1.97 deraadt 773: motd re-writing and change the find(1) to use -execdir
774: (patch included).</a>
1.117 deraadt 775: <li><a href=errata25.html#chflags>Jul 30, 1999: Do not permit regular
1.95 deraadt 776: users to chflags(2) or fchflags(2) on character or block devices
777: which they may currently be the owner of (patch included).</a>
1.117 deraadt 778: <li><a href=errata25.html#nroff>Jul 27, 1999: Cause groff(1) to be invoked
1.95 deraadt 779: with the -S flag, when called by nroff(1) (patch included).</a>
1.93 deraadt 780: </ul>
781:
1.106 deraadt 782: <p>
783: <li>
1.75 deraadt 784: <a name=24></a>
1.235 miod 785:
1.110 deraadt 786: <h3><font color=#e00000>OpenBSD 2.4 Security Advisories</font></h3>
1.75 deraadt 787: These are the OpenBSD 2.4 advisories -- all these problems are solved
788: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
789: OpenBSD 2.3 advisories listed below are fixed in OpenBSD 2.4.
790:
1.96 deraadt 791: <p>
1.75 deraadt 792: <ul>
1.92 deraadt 793: <li><a href=errata24.html#poll>Mar 22, 1999: The nfds argument for poll(2) needs
1.91 deraadt 794: to be constrained, to avoid kvm starvation (patch included).</a>
1.92 deraadt 795: <li><a href=errata24.html#tss>Mar 21, 1999: A change in TSS handling stops
1.91 deraadt 796: another kernel crash case caused by the <strong>crashme</strong>
797: program (patch included).</a>
1.92 deraadt 798: <li><a href=errata24.html#nlink>Feb 25, 1999: An unbounded increment on the
1.90 deraadt 799: nlink value in FFS and EXT2FS filesystems can cause a system crash.
1.89 deraadt 800: (patch included).</a>
1.92 deraadt 801: <li><a href=errata24.html#ping>Feb 23, 1999: Yet another buffer overflow
1.88 deraadt 802: existed in ping(8). (patch included).</a>
1.92 deraadt 803: <li><a href=errata24.html#ipqrace>Feb 19, 1999: ipintr() had a race in use of
1.87 deraadt 804: the ipq, which could permit an attacker to cause a crash.
805: (patch included).</a>
1.92 deraadt 806: <li><a href=errata24.html#accept>Feb 17, 1999: A race condition in the
1.86 deraadt 807: kernel between accept(2) and select(2) could permit an attacker
808: to hang sockets from remote.
809: (patch included).</a>
1.92 deraadt 810: <li><a href=errata24.html#maxqueue>Feb 17, 1999: IP fragment assembly can
1.85 deraadt 811: bog the machine excessively and cause problems.
812: (patch included).</a>
1.92 deraadt 813: <li><a href=errata24.html#trctrap>Feb 12, 1999: i386 T_TRCTRAP handling and
1.84 deraadt 814: DDB interacted to possibly cause a crash.
815: (patch included).</a>
1.92 deraadt 816: <li><a href=errata24.html#rst>Feb 11, 1999: TCP/IP RST handling was sloppy.
1.83 deraadt 817: (patch included).</a>
1.92 deraadt 818: <li><a href=errata24.html#bootpd>Nov 27, 1998: There is a remotely exploitable
1.81 deraadt 819: problem in bootpd(8). (patch included).</a>
1.92 deraadt 820: <li><a href=errata24.html#termcap>Nov 19, 1998: There is a possibly locally
1.82 deraadt 821: exploitable problem relating to environment variables in termcap
822: and curses. (patch included).</a>
1.92 deraadt 823: <li><a href=errata24.html#tcpfix>Nov 13, 1998: There is a remote machine lockup
1.78 deraadt 824: bug in the TCP decoding kernel. (patch included).</a>
1.75 deraadt 825: </ul>
826:
1.106 deraadt 827: <p>
828: <li>
1.58 deraadt 829: <a name=23></a>
1.235 miod 830:
1.110 deraadt 831: <h3><font color=#e00000>OpenBSD 2.3 Security Advisories</font></h3>
1.73 deraadt 832: These are the OpenBSD 2.3 advisories -- all these problems are solved
833: in <a href=anoncvs.html>OpenBSD current</a>. Obviously, all the
834: OpenBSD 2.2 advisories listed below are fixed in OpenBSD 2.3.
1.53 matthieu 835:
1.96 deraadt 836: <p>
1.53 matthieu 837: <ul>
1.81 deraadt 838: <li><a href=errata23.html#bootpd>Nov 27, 1998: There is a remotely exploitable
839: problem in bootpd(8). (patch included).</a>
1.78 deraadt 840: <li><a href=errata23.html#tcpfix>Nov 13, 1998: There is a remote machine lockup
841: bug in the TCP decoding kernel. (patch included).</a>
1.190 mpech 842: <li><a href=errata23.html#resolver>August 31, 1998: A benign looking resolver
843: buffer overflow bug was re-introduced accidentally (patches included).</a>
844: <li><a href=errata23.html#chpass>Aug 2, 1998:
845: chpass(1) has a file descriptor leak which allows an
846: attacker to modify /etc/master.passwd.</a>
847: <li><a href=errata23.html#inetd>July 15, 1998: Inetd had a file descriptor leak.</a>
1.76 aaron 848: <li><a href=errata23.html#fdalloc>Jul 2, 1998: setuid and setgid processes
1.72 deraadt 849: should not be executed with fd slots 0, 1, or 2 free.
850: (patch included).</a>
1.76 aaron 851: <li><a href=errata23.html#xlib>June 6, 1998: Further problems with the X
1.71 deraadt 852: libraries (patches included).</a>
1.76 aaron 853: <li><a href=errata23.html#kill>May 17, 1998: kill(2) of setuid/setgid target
1.66 deraadt 854: processes too permissive (4th revision patch included).</a>
1.76 aaron 855: <li><a href=errata23.html#immutable>May 11, 1998: mmap() permits partial bypassing
1.60 deraadt 856: of immutable and append-only file flags. (patch included).</a>
1.190 mpech 857: <li><a href=errata23.html#ipsec>May 5, 1998: Incorrect handling of IPSEC packets
858: if IPSEC is enabled (patch included).</a>
1.76 aaron 859: <li><a href=errata23.html#xterm-xaw>May 1, 1998: Buffer overflow in xterm and Xaw
1.58 deraadt 860: (CERT advisory VB-98.04) (patch included).</a>
1.53 matthieu 861: </ul>
1.9 deraadt 862:
1.106 deraadt 863: <p>
864: <li>
1.58 deraadt 865: <a name=22></a>
1.235 miod 866:
1.110 deraadt 867: <h3><font color=#e00000>OpenBSD 2.2 Security Advisories</font></h3>
1.45 deraadt 868: These are the OpenBSD 2.2 advisories. All these problems are solved
1.55 deraadt 869: in <a href=23.html>OpenBSD 2.3</a>. Some of these problems
1.45 deraadt 870: still exist in other operating systems. (The supplied patches are for
871: OpenBSD 2.2; they may or may not work on OpenBSD 2.1).
1.9 deraadt 872:
1.96 deraadt 873: <p>
1.9 deraadt 874: <ul>
1.72 deraadt 875: <li><a href=errata22.html#ipsec>May 5, 1998: Incorrect handling of IPSEC
876: packets if IPSEC is enabled (patch included).</a>
877: <li><a href=errata22.html#xterm-xaw>May 1, 1998: Buffer overflow in xterm
878: and Xaw (CERT advisory VB-98.04) (patch included).</a>
879: <li><a href=errata22.html#uucpd>Apr 22, 1998: Buffer overflow in uucpd
880: (patch included).</a>
881: <li><a href=errata22.html#rmjob>Apr 22, 1998: Buffer mismanagement in lprm
882: (patch included).</a>
883: <li><a href=errata22.html#ping>Mar 31, 1998: Overflow in ping -R (patch included).</a>
884: <li><a href=errata22.html#named>Mar 30, 1998: Overflow in named fake-iquery
1.59 deraadt 885: (patch included).</a>
1.72 deraadt 886: <li><a href=errata22.html#mountd>Mar 2, 1998: Accidental NFS filesystem
887: export (patch included).</a>
1.112 philen 888: <li><a href="advisories/mmap.txt">Feb 26, 1998: Read-write mmap() flaw.</a>
1.72 deraadt 889: Revision 3 of the patch is available <a href=errata22.html#mmap>here</a>
1.112 philen 890: <li><a href="advisories/sourceroute.txt">Feb 19, 1998: Sourcerouted Packet
1.59 deraadt 891: Acceptance.</a>
1.50 deraadt 892: A patch is available <a href=errata22.html#sourceroute>here</a>.
1.122 rohee 893: <li><a href=errata22.html#ruserok>Feb 13, 1998: Setuid coredump & Ruserok()
1.72 deraadt 894: flaw (patch included).</a>
895: <li><a href=errata22.html#ldso>Feb 9, 1998: MIPS ld.so flaw (patch included).</a>
1.1 deraadt 896: </ul>
897:
1.106 deraadt 898: <p>
899: <li>
1.58 deraadt 900: <a name=21></a>
1.235 miod 901:
1.110 deraadt 902: <h3><font color=#e00000>OpenBSD 2.1 Security Advisories</font></h3>
1.52 deraadt 903: These are the OpenBSD 2.1 advisories. All these problems are solved
904: in <a href=22.html>OpenBSD 2.2</a>. Some of these problems still
905: exist in other operating systems. (If you are running OpenBSD 2.1, we
906: would strongly recommend an upgrade to the newest release, as this
907: patch list only attempts at fixing the most important security
908: problems. In particular, OpenBSD 2.2 fixes numerous localhost
909: security problems. Many of those problems were solved in ways which
910: make it hard for us to provide patches).
911:
1.96 deraadt 912: <p>
1.52 deraadt 913: <ul>
1.112 philen 914: <li><a href="advisories/signals.txt">Sep 15, 1997: Deviant Signals (patch included)</a>
915: <li><a href="advisories/rfork.txt">Aug 2, 1997: Rfork() system call flaw
1.59 deraadt 916: (patch included)</a>
1.112 philen 917: <li><a href="advisories/procfs.txt">Jun 24, 1997: Procfs flaws (patch included)</a>
1.52 deraadt 918: </ul>
1.51 deraadt 919:
1.106 deraadt 920: <p>
921: <li>
922: <a name=20></a>
1.235 miod 923:
1.110 deraadt 924: <h3><font color=#e00000>OpenBSD 2.0 Security Advisories</font></h3>
1.99 deraadt 925: These are the OpenBSD 2.0 advisories. All these problems are solved
926: in <a href=21.html>OpenBSD 2.1</a>. Some of these problems still
927: exist in other operating systems. (If you are running OpenBSD 2.0, we
928: commend you for being there back in the old days!, but you're really
929: missing out if you don't install a new version!)
930:
931: <p>
932: <ul>
1.112 philen 933: <li><a href="advisories/res_random.txt">April 22, 1997: Predictable IDs in the
1.99 deraadt 934: resolver (patch included)</a>
935: <li>Many others... if people can hunt them down, please let me know
936: and we'll put them up here.
937: </ul>
938:
1.106 deraadt 939: </dl>
1.51 deraadt 940: <p>
1.106 deraadt 941:
942: <a name=watching></a>
1.110 deraadt 943: <li><h3><font color=#e00000>Watching our Changes</font></h3><p>
1.106 deraadt 944:
1.21 deraadt 945: Since we take a proactive stance with security, we are continually
946: finding and fixing new security problems. Not all of these problems
1.80 espie 947: get widely reported because (as stated earlier) many of them are not
1.45 deraadt 948: confirmed to be exploitable; many simple bugs we fix do turn out to
949: have security consequences we could not predict. We do not have the
950: time resources to make these changes available in the above format.<p>
1.21 deraadt 951:
952: Thus there are usually minor security fixes in the current source code
953: beyond the previous major OpenBSD release. We make a limited
1.45 deraadt 954: guarantee that these problems are of minimal impact and unproven
1.44 ian 955: exploitability. If we discover that a problem definitely matters for
1.45 deraadt 956: security, patches will show up here <strong>VERY</strong> quickly.<p>
1.21 deraadt 957:
1.45 deraadt 958: People who are really concerned with security can do a number of
959: things:<p>
1.21 deraadt 960:
961: <ul>
962: <li>If you understand security issues, watch our
1.27 deraadt 963: <a href=mail.html>source-changes mailing list</a> and keep an
1.23 deraadt 964: eye out for things which appear security related. Since
1.21 deraadt 965: exploitability is not proven for many of the fixes we make,
966: do not expect the relevant commit message to say "SECURITY FIX!".
967: If a problem is proven and serious, a patch will be available
968: here very shortly after.
1.161 horacio 969: <li>In addition to source changes, you can watch our <a href="mail.html">
1.160 ericj 970: security-announce mailing list</a> which will notify you for every
1.186 ian 971: security related item that the OpenBSD team deems as a possible threat,
1.160 ericj 972: and instruct you on how to patch the problem.
1.21 deraadt 973: <li>Track our current source code tree, and teach yourself how to do a
1.29 deraadt 974: complete system build from time to time (read /usr/src/Makefile
975: carefully). Users can make the assumption that the current
976: source tree always has stronger security than the previous release.
1.45 deraadt 977: However, building your own system from source code is not trivial;
978: it is nearly 300MB of source code, and problems do occur as we
979: transition between major releases.
1.115 ericj 980: <li>Install a binary snapshot for your
1.80 espie 981: architecture, which are made available fairly often. For
1.29 deraadt 982: instance, an i386 snapshot is typically made available weekly.
1.21 deraadt 983: </ul>
984:
1.9 deraadt 985: <p>
1.153 jufi 986: <a name=reporting></a>
1.110 deraadt 987: <li><h3><font color=#e00000>Reporting problems</font></h3><p>
1.3 deraadt 988:
1.5 deraadt 989: <p> If you find a new security problem, you can mail it to
1.6 deraadt 990: <a href=mailto:deraadt@openbsd.org>deraadt@openbsd.org</a>.
1.7 deraadt 991: <br>
1.5 deraadt 992: If you wish to PGP encode it (but please only do so if privacy is very
1.112 philen 993: urgent, since it is inconvenient) use this <a href="advisories/pgpkey.txt">pgp key</a>.
1.5 deraadt 994:
1.107 deraadt 995: <p>
996: <a name=papers></a>
1.110 deraadt 997: <li><h3><font color=#e00000>Further Reading</font></h3><p>
1.107 deraadt 998:
999: A number of papers have been written by OpenBSD team members, about security
1000: related changes they have done in OpenBSD. The postscript versions of these
1.108 deraadt 1001: documents are available as follows.<p>
1.107 deraadt 1002:
1003: <ul>
1.113 deraadt 1004: <li>A Future-Adaptable Password Scheme.<br>
1.118 deraadt 1005: <a href=events.html#usenix99>Usenix 1999</a>,
1.153 jufi 1006: by <a href=mailto:provos@openbsd.org>Niels Provos</a>,
1.113 deraadt 1007: <a href=mailto:dm@openbsd.org>David Mazieres</a>.<br>
1.107 deraadt 1008: <a href=papers/bcrypt-paper.ps>paper</a> and
1009: <a href=papers/bcrypt-slides.ps>slides</a>.
1.113 deraadt 1010: <p>
1011: <li>Cryptography in OpenBSD: An Overview.<br>
1.118 deraadt 1012: <a href=events.html#usenix99>Usenix 1999</a>,
1.113 deraadt 1013: by <a href=mailto:deraadt@openbsd.org>Theo de Raadt</a>,
1014: <a href=mailto:niklas@openbsd.org>Niklas Hallqvist</a>,
1015: <a href=mailto:art@openbsd.org>Artur Grabowski</a>,
1016: <a href=mailto:angelos@openbsd.org>Angelos D. Keromytis</a>,
1017: <a href=mailto:provos@openbsd.org>Niels Provos</a>.<br>
1.107 deraadt 1018: <a href=papers/crypt-paper.ps>paper</a> and
1019: <a href=papers/crypt-slides.ps>slides</a>.
1.113 deraadt 1020: <p>
1021: <li>strlcpy and strlcat -- consistent, safe, string copy and concatenation.<br>
1.118 deraadt 1022: <a href=events.html#usenix99>Usenix 1999</a>,
1.113 deraadt 1023: by <a href=mailto:millert@openbsd.org>Todd C. Miller</a>,
1024: <a href=mailto:deraadt@openbsd.org>Theo de Raadt</a>.<br>
1.109 deraadt 1025: <a href=papers/strlcpy-paper.ps>paper</a> and
1026: <a href=papers/strlcpy-slides.ps>slides</a>.
1.113 deraadt 1027: <p>
1.118 deraadt 1028: <li>Dealing with Public Ethernet Jacks-Switches, Gateways, and Authentication.<br>
1029: <a href=events.html#lisa99>LISA 1999</a>,
1030: by <a href=mailto:beck@openbsd.org>Bob Beck</a>.<br>
1031: <a href=papers/authgw-paper.ps>paper</a> and
1032: <a href=papers/authgw-slides.ps>slides</a>.
1033: <p>
1.153 jufi 1034: <li>Encrypting Virtual Memory<br>
1.142 deraadt 1035: <a href=events.html#sec2000>Usenix Security 2000</a>,
1036: <a href=mailto:provos@openbsd.org>Niels Provos</a>.<br>
1.143 provos 1037: <a href=papers/swapencrypt.ps>paper</a> and
1038: <a href=papers/swapencrypt-slides.ps>slides</a>.
1.142 deraadt 1039: <p>
1.107 deraadt 1040: </ul>
1041:
1.106 deraadt 1042: </dl>
1043:
1.2 deraadt 1044: <hr>
1.68 pauls 1045: <a href=index.html><img height=24 width=24 src=back.gif border=0 alt=OpenBSD></a>
1.24 deraadt 1046: <a href=mailto:www@openbsd.org>www@openbsd.org</a>
1047: <br>
1.244 ! miod 1048: <small>$OpenBSD: security.html,v 1.243 2003/03/26 01:16:40 deraadt Exp $</small>
1.1 deraadt 1049:
1.24 deraadt 1050: </body>
1051: </html>