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Gentoo Linux Security Advisory                           GLSA 200801-16
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                                            https://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:

  https://security.gentoo.org/glsa/200801-16

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 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.

https://creativecommons.org/licenses/by-sa/2.5/