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If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important. If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.
Vulnerability Assessment Details
Check for the version of the sendmail packages
Detailed Explanation for this Vulnerability Assessment
The sendmail packages shipped with Red Hat Linux Advanced Server have a
security bug if sendmail is configured to use smrsh. This security errata
release fixes the problem.
[Updated 06 Feb 2003]
Added fixed packages for Advanced Workstation 2.1
SMRSH (the SendMail Restricted SHell) is a /bin/sh replacement for
Sendmail. It provides the ability to limit the set of executable programs
available to Sendmail.
A bug in the version of smrsh packaged as part of Sendmail 8.12.6 and
8.11.6 permits attackers to bypass shrsh's intended restrictions. This
can be done by inserting additional commands after "||" or "/" characters,
which are not properly filtered or verified. A sucessful attack would
permit a possible hacker who has a local account on a system to execute arbitrary
binaries as themselves by utilizing their .forward file.
Because sendmail as shipped with Red Hat Linux Advanced Server is not
configured to use smrsh, this issue only affects users who have customized
their sendmail configuration to use smrsh.
Users who have configured sendmail to use smrsh should update to these
errata packages which contain a backported security fix, and are therefore
not vulnerable to this issue.
Solution : http://rhn.redhat.com/errata/RHSA-2002-259.html
Network Security Threat Level: High
Networks Security ID:
Vulnerability Assessment Copyright: This script is Copyright (C) 2004 Tenable Network Security
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