full-disclosure - [ GLSA 200901-11 ] Avahi: Denial of Service

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Date: Thu, 15 Jan 2009 00:05:35 +0100
From: Pierre-Yves Rofes <py@...too.org>
To: gentoo-announce@...too.org
Cc: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com,
	security-alerts@...uxsecurity.com
Subject: [ GLSA 200901-11 ] Avahi: Denial of Service

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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@...too.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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