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Gentoo Linux Security Advisory                           GLSA 200702-06
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: BIND: Denial of Service
      Date: February 17, 2007
      Bugs: #163692
        ID: 200702-06

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Synopsis
========

ISC BIND contains two vulnerabilities allowing a Denial of Service
under certain conditions.

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       < 9.3.4                               >= 9.3.4
                                                             *>= 9.2.8

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

An unspecified improper usage of an already freed context has been
reported. Additionally, an assertion error could be triggered in the
DNSSEC validation of some responses to type ANY queries with multiple
RRsets.

Impact
======

A remote attacker could crash the server through unspecified vectors
or, if DNSSEC validation is enabled, by sending certain crafted ANY
queries.

Workaround
==========

There is no known workaround at this time for the first issue. The
DNSSEC validation Denial of Service can be prevented by disabling
DNSSEC validation until the upgrade to a fixed version. Note that
DNSSEC validation is disabled on a default configuration.

Resolution
==========

All ISC BIND 9.3 users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-dns/bind-9.3.4"

All ISC BIND 9.2 users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-dns/bind-9.2.8"

References
==========

  [ 1 ] CVE-2007-0493
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-0493
  [ 2 ] CVE-2007-0494
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-CVE-2007-0494

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

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

  http://security.gentoo.org/glsa/glsa-200702-06.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 2007 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