GLSA 200908-02 BIND: Denial of Service
Posted on: 08/01/2009 11:10 PM

A new security update has been released for Gentoo Linux - BIND: Denial of Service. Here the announcement:

Gentoo Linux Security Advisory GLSA 200908-02
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http://security.gentoo.org/
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Severity: Normal
Title: BIND: Denial of Service
Date: August 01, 2009
Bugs: #279508
ID: 200908-02

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Synopsis
========

Dynamic Update packets can cause a Denial of Service in the BIND
daemon.

Background
==========

ISC BIND is the Internet Systems Consortium implementation of the
Domain Name System (DNS) protocol.

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

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 net-dns/bind lt; 9.4.3_p3 gt;= 9.4.3_p3

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

Matthias Urlichs reported that the dns_db_findrdataset() function fails
when the prerequisite section of the dynamic update message contains a
record of type "ANY" and where at least one RRset for this FQDN exists
on the server.

Impact
======

A remote unauthenticated attacker could send a specially crafted
dynamic update message to the BIND daemon (named), leading to a Denial
of Service (daemon crash). This vulnerability affects all primary
(master) servers -- it is not limited to those that are configured to
allow dynamic updates.

Workaround
==========

Configure a firewall that performs Deep Packet Inspection to prevent
nsupdate messages from reaching named. Alternatively, expose only
secondary (slave) servers to untrusted networks.

Resolution
==========

All BIND users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose "gt;=net-dns/bind-9.4.3_p3"

References
==========

[ 1 ] CVE-2009-0696
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0696
[ 2 ] ISC advisory
https://www.isc.org/node/474

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

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

http://security.gentoo.org/glsa/glsa-200908-02.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
https://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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