[ GLSA 201111-06 ] MaraDNS: Arbitrary code execution

[Alex Legler <a3li () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 201111-06
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                                            http://security.gentoo.org/
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 Severity: High
    Title: MaraDNS: Arbitrary code execution
     Date: November 20, 2011
     Bugs: #352569
       ID: 201111-06

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Synopsis
========

A buffer overflow vulnerability in MaraDNS allows remote attackers to
execute arbitrary code or cause a Denial of Service.

Background
==========

MaraDNS is a proxy DNS server with permanent caching.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  net-dns/maradns              < 1.4.06                  >= 1.4.06 

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

A long DNS hostname with a large number of labels could trigger a
buffer overflow in the compress_add_dlabel_points() function of
dns/Compress.c.

Impact
======

A remote unauthenticated attacker could execute arbitrary code or cause
a Denial of Service.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All MaraDNS users should upgrade to the latest stable version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=net-dns/maradns-1.4.06"

NOTE: This is a legacy GLSA. Updates for all affected architectures are
available since February 12, 2011. It is likely that your system is
already no longer affected by this issue.

References
==========

[ 1 ] CVE-2011-0520
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-0520

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

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

 http://security.gentoo.org/glsa/glsa-201111-06.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
https://bugs.gentoo.org.

License
=======

Copyright 2011 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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