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AUSCERT External Security Bulletin Redistribution
ESB-2006.0752 -- [Solaris]
A "Use-after-free" Vulnerability in Sendmail Versions Before
8.13.8 may Allow a Denial of Service (DoS)
1 February 2007
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AusCERT Security Bulletin Summary
---------------------------------
Product: sendmail versions prior to 8.13.8
Publisher: Sun Microsystems
Operating System: Solaris 9, 10
Impact: Denial of Service
Access: Remote/Unauthenticated
CVE Names: CVE-2006-4434
Ref: ESB-2006.0627
Revision History: February 1 2007: Patches available.
December 14 2006: New relief/workaround information
provided
November 29 2006: Patch released.
October 12 2006: Initial Release
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Sun(sm) Alert Notification
* Sun Alert ID: 102664
* Synopsis: A "Use-after-free" Vulnerability in Sendmail Versions
Before 8.13.8 may Allow a Denial of Service (DoS)
* Category: Security
* Product: Solaris 9 Operating System, Solaris 10 Operating System
* BugIDs: 6458595
* Avoidance: Patch
* State: Resolved
* Date Released: 10-Oct-2006, 30-Jan-2007
* Date Closed: 30-Jan-2007
* Date Modified: 27-Nov-2006, 12-Dec-2006, 30-Jan-2007
1. Impact
A "use-after-free" security vulnerability in sendmail(1M) relating to
the handling of long header lines may allow a local or remote
unprivileged user to fill up a disk if sendmail(1M) is configured to
write unique core files. The core files created by sendmail(1M) would
be written to the disk partition configured with coreadm(1M). The
ability to consume all available space of a disk partition (which may
be the root "/" partition) is a type of denial of service (DoS).
Additional information regarding this issue is available at:
* CVE-2006-4434 at:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4434
2. Contributing Factors
This issue can occur in the following releases:
SPARC Platform
* Solaris 9 without patch 113575-08
* Solaris 10 without patch 125011-01
x86 Platform
* Solaris 9 without patch 114137-07
* Solaris 10 without patch 125012-01
Note 1: Sendmail versions prior to 8.12.0 are not impacted by this
issue. Solaris 8 uses sendmail versions prior to 8.12.0 and thus is
not impacted.
Note 2: This issue only affects systems which have sendmail(1M)
versions 8.12.0 to 8.13.7 enabled and have configured sendmail(1M) to
create unique core dumps.
To determine the version of sendmail(1M) running on a system, the
mconnect(1) command can be used:
$ /usr/bin/mconnect
connecting to host localhost (127.0.0.1), port 25
connection open
220 an.example.com ESMTP Sendmail 8.13.5+Sun/8.13.5;
Mon, 20 Mar 2006 17:07:57 GMT
quit
221 2.0.0 an.example.com closing connection
If sendmail is not running on the system the mconnect(1) command will
report the following:
$ /usr/bin/mconnect
connecting to host localhost (127.0.0.1), port 25
connect: Connection refused
To determine if sendmail(1M) has been configured to create unique core
dumps the coreadm(1M) command can be utilized to check the global and
per-process core dump settings which affect sendmail processes:
$ coreadm | grep global
global core file pattern: /var/cores/core.%f.%p
global core file content: default
global core dumps: enabled
global setid core dumps: disabled
global core dump logging: disabled
# coreadm `pgrep sendmail`
109584: core.%f.%p default
3. Symptoms
If the described issue occurs, the symptoms would be a decreasing
amount or no free space, as displayed by the df(1M) utility, on the
file system partition which sendmail(1M) is configured to write core
files to using coreadm(1M) due to a large number of sendmail core
dumps.
4. Relief/Workaround
To prevent sendmail(1M) from filling up the configured disk partition
with unique core dumps, the coreadm(1M) utility can be used to
configure sendmail to create statically named core files. This should
be applied to both the global core file pattern (if enabled) and the
per-process core file pattern.
To configure sendmail to create core files with static filenames until
the sendmail service is restarted:
# coreadm -p core.%f $(pgrep sendmail)
5. Resolution
This issue is addressed in the following releases:
SPARC Platform
* Solaris 9 with patch 113575-08 or later
* Solaris 10 with patch 125011-01 or later
x86 Platform
* Solaris 9 with patch 114137-07 or later
* Solaris 10 with patch 125012-01 or later
Change History
27-Nov-2006:
* Upated Contributing Factors and Resolution sections.
12-Dec-2006:
* Updated Relief/Workaround section
30-Jan-2007:
* State: Resolved
* Updated Contributing Factors and Resolution sections
This Sun Alert notification is being provided to you on an "AS IS"
basis. This Sun Alert notification may contain information provided by
third parties. The issues described in this Sun Alert notification may
or may not impact your system(s). Sun makes no representations,
warranties, or guarantees as to the information contained herein. ANY
AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
NON-INFRINGEMENT, ARE HEREBY DISCLAIMED. BY ACCESSING THIS DOCUMENT
YOU ACKNOWLEDGE THAT SUN SHALL IN NO EVENT BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES THAT ARISE
OUT OF YOUR USE OR FAILURE TO USE THE INFORMATION CONTAINED HEREIN.
This Sun Alert notification contains Sun proprietary and confidential
information. It is being provided to you pursuant to the provisions of
your agreement to purchase services from Sun, or, if you do not have
such an agreement, the Sun.com Terms of Use. This Sun Alert
notification may only be used for the purposes contemplated by these
agreements.
Copyright 2000-2006 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved
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