[ GLSA 200804-22 ] PowerDNS Recursor: DNS Cache Poisoning

[Robert Buchholz <rbu () gentoo org>]

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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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