[ GLSA 200908-02 ] BIND: Denial of Service

[Alex Legler <a3li () gentoo org>]

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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     < 9.4.3_p3                           >= 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 ">=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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