U radu programskog paketa MaraDNS uočen je i ispravljen sigurnosni nedostatak. Udaljeni napadač je taj nedostatak mogao iskoristiti za proizvoljno izvršavanje programskog koda te DoS (eng. Denial of Service) napad.

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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
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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