A new security update has been released for Gentoo Linux - Avahi: Denial of Service. Here the announcement:
Gentoo Linux Security Advisory GLSA 200904-10
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http://security.gentoo.org/
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Severity: Normal
Title: Avahi: Denial of Service
Date: April 08, 2009
Bugs: #260971
ID: 200904-10
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Synopsis
========
An error in Avahi might lead to a Denial of Service via network and CPU
consumption.
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-r2 >= 0.6.24-r2
Description
===========
Rob Leslie reported that the
originates_from_local_legacy_unicast_socket() function in
avahi-core/server.c does not account for the network byte order of a
port number when processing incoming multicast packets, leading to a
multicast packet storm.
Impact
======
A remote attacker could send specially crafted legacy unicast mDNS
query packets to the Avahi daemon, resulting in a Denial of Service due
to network bandwidth and CPU consumption.
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-r2"
References
==========
[ 1 ] CVE-2009-0758
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0758
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200904-10.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
