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Gentoo Linux Security Advisory                           GLSA 200804-22
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: PowerDNS Recursor: DNS Cache Poisoning
      Date: April 18, 2008
      Bugs: #215567
        ID: 200804-22

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Synopsis
========

Use of insufficient randomness in PowerDNS Recursor might lead to DNS
cache poisoning.

Background
==========

The PowerDNS Recursor is an advanced recursing nameserver.

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

    -------------------------------------------------------------------
     Package                /  Vulnerable  /                Unaffected
    -------------------------------------------------------------------
  1  net-dns/pdns-recursor       < 3.1.5                      >= 3.1.5

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

Amit Klein of Trusteer reported that insufficient randomness is used to
calculate the TRXID values and the UDP source port numbers.

Impact
======

A remote attacker could send malicious answers to insert arbitrary DNS
data into the cache. These attacks would in turn help an attacker to
perform man-in-the-middle and site impersonation attacks.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All PowerDNS Recursor users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose
 ">=net-dns/pdns-recursor-3.1.5"

References
==========

  [ 1 ] CVE-2008-1637
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1637

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

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

  http://security.gentoo.org/glsa/glsa-200804-22.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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