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Gentoo Linux Security Advisory                           GLSA 200609-11
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: BIND: Denial of Service
      Date: September 15, 2006
      Bugs: #146486
        ID: 200609-11

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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     < 9.3.2-r4                           >= 9.3.2-r4
                                                          *>= 9.2.6-r4

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

Queries for SIG records will cause an assertion error if more than one
SIG RRset is returned. Additionally, an INSIST failure can be triggered
by sending multiple recursive queries if the response to the query
arrives after all the clients looking for the response have left the
recursion queue.

Impact
======

An attacker having access to a recursive server can crash the server by
querying the SIG records where there are multiple SIG RRsets, or by
sending many recursive queries in a short time. The exposure can be
lowered by restricting the clients that can ask for recursion. An
attacker can also crash an authoritative server serving a DNSSEC zone
in which there are multiple SIG RRsets.

Workaround
==========

There are no known workarounds at this time.

Resolution
==========

All BIND 9.3 users should update to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-dns/bind-9.3.2-r4"

All BIND 9.2 users should update to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-dns/bind-9.2.6-r4"

References
==========

  [ 1 ] CVE-2006-4095
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4095
  [ 2 ] CVE-2006-4096
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4096

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

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

  http://security.gentoo.org/glsa/glsa-200609-11.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 2006 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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