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

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory GLSA 200801-16
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                                            http://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

  Severity: Normal
     Title: MaraDNS: CNAME Denial of Service
      Date: January 29, 2008
      Bugs: #204351
        ID: 200801-16

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

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_at_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