[ GLSA 200801-16 ] MaraDNS: CNAME Denial of Service

[Raphael Marichez <falco () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200801-16
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: MaraDNS: CNAME Denial of Service
      Date: January 29, 2008
      Bugs: #204351
        ID: 200801-16

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Synopsis
========

MaraDNS is prone to a Denial of Service vulnerability impacting CNAME
resolution.

Background
==========

MaraDNS is a package that implements the Domain Name Service (DNS) with
resolver and caching ability.

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

    -------------------------------------------------------------------
     Package          /   Vulnerable   /                    Unaffected
    -------------------------------------------------------------------
  1  net-dns/maradns      < 1.2.12.08                     >= 1.2.12.08

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

Michael Krieger reported that a specially crafted DNS could prevent an
authoritative canonical name (CNAME) record from being resolved because
of an "improper rotation of resource records".

Impact
======

A remote attacker could send specially crafted DNS packets to a
vulnerable server, making it unable to resolve CNAME records.

Workaround
==========

Add "max_ar_chain = 2" to the "marac" configuration file.

Resolution
==========

All MaraDNS users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-dns/maradns-1.2.12.09"

References
==========

  [ 1 ] CVE-2008-0061
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0061

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

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

  http://security.gentoo.org/glsa/glsa-200801-16.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 2008 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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