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Gentoo Linux Security Advisory                           GLSA 200702-03
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http://security.gentoo.org/ 
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  Severity: Normal
     Title: Snort: Denial of Service
      Date: February 13, 2007
      Bugs: #161632
        ID: 200702-03

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Synopsis
=======
Snort contains a vulnerability in the rule matching algorithm that
could result in a Denial of Service.

Background
=========
Snort is a widely deployed intrusion detection program.

Affected packages
================
    -------------------------------------------------------------------
     Package             /  Vulnerable  /                   Unaffected
    -------------------------------------------------------------------
  1  net-analyzer/snort      < 2.6.1.2                      >= 2.6.1.2

Description
==========
Randy Smith, Christian Estan and Somesh Jha discovered that the rule
matching algorithm of Snort can be exploited in a way known as a
"backtracking attack" to perform numerous time-consuming operations.

Impact
=====
A remote attacker could send specially crafted network packets, which
would result in the cessation of the detections and the consumption of
the CPU resources.

Workaround
=========
There is no known workaround at this time.

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

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-analyzer/snort-2.6.1.2"

References
=========
  [ 1 ] CVE-2006-6931
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-6931 

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

http://security.gentoo.org/glsa/glsa-200702-03.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 2007 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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