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AUSCERT External Security Bulletin Redistribution
ESB-2004.0390 -- Sun Alert Notification - Sun Alert ID: 57573
Buffer Overflow in sendmail(1M) Ruleset Parsing May Result in
Unauthorized Privileges
08 June 2004
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: sendmail
Publisher: Sun Microsystems
Operating System: Solaris 7
Solaris 8
Solaris 9
Impact: Root Compromise
Access Required: Remote
CVE Names: CAN-2003-0681
Comment: Original Bulletin:
http://sunsolve.sun.com/pub-cgi/retrieve.pl?doc=fsalert%2F57573
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DOCUMENT ID: 57573
SYNOPSIS: Buffer Overflow in sendmail(1M) Ruleset Parsing May Result
in Unauthorized Privileges
DETAIL DESCRIPTION:
Sun(sm) Alert Notification
* Sun Alert ID: 57573
* Synopsis: Buffer Overflow in sendmail(1M) Ruleset Parsing May
Result in Unauthorized Privileges
* Category: Security
* Product: Solaris
* BugIDs: 4954379
* Avoidance: Patch, Workaround
* State: Resolved
* Date Released: 04-Jun-2004
* Date Closed: 04-Jun-2004
* Date Modified:
1. Impact
There is a potential buffer overflow in sendmail(1M) involving the
parsing of rulesets which affects sendmail(1M) versions earlier than
8.12.10. This could result in a local or remote unprivileged user
gaining unauthorized root privileges.
Note: This issue does not affect the default configuration of
sendmail(1M).
This issue is referenced in CERT Vulnerability Note VU#108964 which
can be seen at [1]http://www.kb.cert.org/vuls/id/108964 and
CAN-2003-0681 at
[2]http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0681.
2. Contributing Factors
This issue can occur in the following releases:
SPARC Platform
* Solaris 7 without patch 107684-11
* Solaris 8 without patch 110615-11
* Solaris 9 without sendmail(1M) upgrade 8.12.10 (as delivered in
patch 113575-05)
x86 Platform
* Solaris 7 without patch 107685-11
* Solaris 8 without patch 110616-11
* Solaris 9 without sendmail(1M) upgrade 8.12.10 (as delivered in
patch 114137-04)
Note: Only systems using the following non-standard rulesets are at
risk: recipient (2), final (4), or mailer-specific envelope recipients
rulesets.
To determine which version of sendmail(1M) is running on a system, run
the following command:
$ /usr/bin/mconnect
connecting to host localhost (127.0.0.1), port 25
connection open
220 an.example.com ESMTP Sendmail 8.9.3+Sun/8.9.3; Tue, 6 Apr 2004 14:46:17
+0100 (BST)
help
214-This is Sendmail version 8.9.3+Sun
214-Topics:
214- HELO EHLO MAIL RCPT DATA
214- RSET NOOP QUIT HELP VRFY
214- EXPN VERB ETRN DSN
214-For more info use "HELP <topic>".
214-To report bugs in the implementation contact Sun Microsystems
214-Technical Support.
214-For local information send email to Postmaster at your site.
214 End of HELP info
quit
221 an.example.com closing connection
To determine whether a system is configured with the vulnerable
rulesets, view the "/etc/mail/sendmail.cf" file and the "*.mc"
configuration files. The latter are normally located in
"/usr/lib/mail/cf/" on Solaris, but this may vary depending on how
sendmail(1M) has been set up on a system.
The following indicates that sendmail(1M) has been configured with
these rulesets:
* Either the "*.mc" file contains:
LOCAL_RULE_2
or:
* "/etc/mail/sendmail.cf" contains a line beginning:
Srecipient=2 (version 8.10 or later) or S2 (version 8.9 and earlier)
* "etc/mail/sendmail.cf" or the *.mc file contain:
$>2 or $>recipient
* "etc/mail/sendmail.cf" or the *.mc file contain:
$>4 or $>final
3. Symptoms
There are no reliable symptoms that would indicate the described issue
has been exploited.
SOLUTION SUMMARY:
4. Relief/Workaround
If the system has been configured as detailed in "Contributing
Factors", the affected lines in the "*.mc" configuration file may be
modified. Comment out the affected lines in this file by inserting
"dnl" at the beginning of the affected line. For example:
dnl <rest of line goes here>
Then generate the new "sendmail.cf" file from this revised "*.mc" file
and copy this to "/etc/mail/sendmail.cf". Please refer to
"/usr/lib/mail/README" for additional information on how to use the
"*.mc" files.
Once the files have been modified, restart sendmail(1M) with the
following commands:
# /etc/init.d/sendmail stop
# /etc/init.d/sendmail start
For more detailed information please see the sendmail(1M) man pages or
[3]http://www.sendmail.org/m4/intro.html.
5. Resolution
This issue is addressed in the following releases:
SPARC Platform
* Solaris 7 with patch 107684-11 or later
* Solaris 8 with patch 110615-11 or later
* Solaris 9 with sendmail(1M) upgrade 8.12.10 (as delivered in patch
113575-05 or later)
x86 Platform
* Solaris 7 with patch 107685-11 or later
* Solaris 8 with patch 110616-11 or later
* Solaris 9 with sendmail(1M) upgrade 8.12.10 (as delivered in patch
114137-04 or later)
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 2000-2004 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved.
References
1. http://www.kb.cert.org/vuls/id/108964
2. http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0681
3. http://www.sendmail.org/m4/intro.html
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