[ GLSA 200901-11 ] Avahi: Denial of Service

[Pierre-Yves Rofes <py () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200901-11
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                                             http://security.gentoo.org/
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   Severity: Normal
      Title: Avahi: Denial of Service
       Date: January 14, 2009
       Bugs: #250913
         ID: 200901-11

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Synopsis
========

A Denial of Service vulnerability has been discovered in Avahi.

Background
==========

Avahi is a system that facilitates service discovery on a local
network.

Affected packages
=================

     -------------------------------------------------------------------
      Package        /  Vulnerable  /                        Unaffected
     -------------------------------------------------------------------
   1  net-dns/avahi      < 0.6.24                             >= 0.6.24

Description
===========

Hugo Dias reported a failed assertion in the
originates_from_local_legacy_unicast_socket() function in
avahi-core/server.c when processing mDNS packets with a source port of
0.

Impact
======

A remote attacker could send specially crafted packets to the daemon,
leading to its crash.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Avahi users should upgrade to the latest version:

     # emerge --sync
     # emerge --ask --oneshot --verbose ">=net-dns/avahi-0.6.24"

References
==========

   [ 1 ] CVE-2008-5081
         http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-5081

Availability
============

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

   http://security.gentoo.org/glsa/glsa-200901-11.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 2009 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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