From: Robert Buchholz <rbu@gentoo.org.>
To: gentoo-announce@gentoo.org
Subject: [ GLSA 200904-10 ] Avahi: Denial of Service
Date: Thu, 9 Apr 2009 00:48:04 +0200
User-Agent: KMail/1.9.9
Cc: bugtraq@securityfocus.com, full-disclosure@lists.grok.org.uk,
security-alerts@linuxsecurity.com
MIME-Version: 1.0
Content-Type: multipart/signed;
boundary="nextPart29511341.QQ3Wx1Bs9h";
protocol="application/pgp-signature";
micalg=pgp-sha1
Content-Transfer-Encoding: 7bit
Message-Id: <200904090048.09963.rbu@gentoo.org.>
X-Virus-Scanned: antivirus-gw at tyumen.ru
--nextPart29511341.QQ3Wx1Bs9h
Content-Type: text/plain;
charset="us-ascii"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory GLSA 200904-10
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
http://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Severity: Normal
Title: Avahi: Denial of Service
Date: April 08, 2009
Bugs: #260971
ID: 200904-10
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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
--nextPart29511341.QQ3Wx1Bs9h
Content-Type: application/pgp-signature; name=signature.asc
Content-Description: This is a digitally signed message part.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.10 (GNU/Linux)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=MAW7
-----END PGP SIGNATURE-----
--nextPart29511341.QQ3Wx1Bs9h--
