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Bug 77647 - SMRSH security issues
SMRSH security issues
Status: CLOSED ERRATA
Product: Red Hat Enterprise Linux 2.1
Classification: Red Hat
Component: sendmail (Show other bugs)
2.1
i386 Linux
medium Severity medium
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Assigned To: Florian La Roche
David Lawrence
: Security
Depends On:
Blocks:
  Show dependency tree / graph
 
Reported: 2002-11-11 08:00 EST by Mark J. Cox (Product Security)
Modified: 2007-11-30 17:06 EST (History)
0 users

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Doc Type: Bug Fix
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Last Closed: 2003-01-30 14:32:16 EST
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Description Mark J. Cox (Product Security) 2002-11-11 08:00:49 EST 
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 allows 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
allow an attacker who has a local account on a system to execute arbitrary
binaries as themselves by utilizing their .forward file.

Because sendmail as shipped by Red Hat is not configured to use smrsh,
this issue only affects Red Hat Linux Advanced Server users who have
customized their sendmail configuration to use smrsh.
Comment 1 Mark J. Cox (Product Security) 2003-01-30 14:32:16 EST 
An errata has been issued which should help the problem described in this bug report. 
This report is therefore being closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files, please follow the link below. You may reopen 
this bug report if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2002-259.html
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