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Gentoo Linux Security Advisory                           GLSA 200611-13
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  Severity: Normal
     Title: Avahi: "netlink" message vulnerability
      Date: November 20, 2006
      Bugs: #154322
        ID: 200611-13

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Synopsis
========

Avahi fails to verify the origin of netlink messages, which could allow
local users to spoof network changes.

Background
==========

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

Affected packages
=================

    -------------------------------------------------------------------
     Package        /  Vulnerable  /                        Unaffected
    -------------------------------------------------------------------
  1  net-dns/avahi      < 0.6.15                             >= 0.6.15

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

Avahi does not check that the netlink messages come from the kernel
instead of a user-space process.

Impact
======

A local attacker could exploit this vulnerability by crafting malicious
netlink messages and trick Avahi to react to fake network changes. This
could lead users to connect to untrusted services without knowing.

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-0.6.15"

References
==========

  [ 1 ] CVE-2006-5461
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-5461

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

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

  http://security.gentoo.org/glsa/glsa-200611-13.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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