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TUCoPS :: Linux :: Gentoo :: b06-3050.htm

Sendmail: denial of service



Sendmail: Denial of Service
Sendmail: Denial of Service



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Gentoo Linux Security Advisory                           GLSA 200606-19
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http://security.gentoo.org/ 
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  Severity: Normal
     Title: Sendmail: Denial of Service
      Date: June 15, 2006
      Bugs: #135141
        ID: 200606-19

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Synopsis
=======
Faulty multipart MIME messages can cause forked Sendmail processes to
crash.

Background
=========
Sendmail is a popular mail transfer agent (MTA).

Affected packages
================
    -------------------------------------------------------------------
     Package            /   Vulnerable   /                  Unaffected
    -------------------------------------------------------------------
  1  mail-mta/sendmail      < 8.13.6-r1                   >= 8.13.6-r1

Description
==========
Frank Sheiness discovered that the mime8to7() function can recurse
endlessly during the decoding of multipart MIME messages until the
stack of the process is filled and the process crashes.

Impact
=====
By sending specially crafted multipart MIME messages, a remote attacker
can cause a subprocess forked by Sendmail to crash. If Sendmail is not
set to use a randomized queue processing, the attack will effectively
halt the delivery of queued mails as well as the malformed one,
incoming mail delivered interactively is not affected. Additionally, on
systems where core dumps with an individual naming scheme (like
"core.pid") are enabled, a filesystem may fill up with core dumps. Core
dumps are disabled by default in Gentoo.

Workaround
=========
The Sendmail 8.13.7 release information offers some workarounds, please
see the Reference below. Note that the issue has actually been fixed in
the 8.13.6-r1 ebuild.

Resolution
=========
All Sendmail users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=mail-mta/sendmail-8.13.6-r1"

References
=========
  [ 1 ] CVE-2006-1173
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1173 
  [ 2 ] Sendmail 8.13.7 release information
http://www.sendmail.org/releases/8.13.7.html 

Availability
===========
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-200606-19.xml 

Concerns?
========
Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at 
http://bugs.gentoo.org. 

License
======
Copyright 2006 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5 

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