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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