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full-disclosure-uk: [Full-disclosure] UPDATE: [ GLSA 200804-22 ]

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

From: Robert Buchholz <rbu_at_nospam>
Date: Thu Aug 21 2008 - 15:38:51 GMT
To: gentoo-announce@gentoo.org

  • - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory [UPDATE] GLSA 200804-22:03
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Severity: Normal Title: PowerDNS Recursor: DNS Cache Poisoning Date: April 18, 2008 Updated: August 21, 2008 Bugs: #215567, #231335 ID: 200804-22:03
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Update


The previous version of the PowerDNS Recursor (3.1.5) did not properly address the issue, as UDP source port selection was insufficiently randomized. We advise all users to upgrade to 3.1.6.

The updated sections appear below.

Affected packages



Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-dns/pdns-recursor < 3.1.6 >= 3.1.6

Description


Amit Klein of Trusteer reported that insufficient randomness is used to calculate the TRXID values and the UDP source port numbers (CVE-2008-1637). Thomas Biege of SUSE pointed out that a prior fix to resolve this issue was incomplete, as it did not always enable the stronger random number generator for source port selection (CVE-2008-3217). 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.

Resolution


All PowerDNS Recursor users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-dns/pdns-recursor-3.1.6"

References


  [ 1 ] CVE-2008-1637
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1637   [ 2 ] CVE-2008-3217
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-3217

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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