GLSA 200801-16 MaraDNS: CNAME Denial of Service

Posted by Bob on: 01/30/2008 12:15 AM [ Print | 0 comment(s) ]

A new security update has been released for Gentoo Linux - MaraDNS: CNAME Denial of Service. Here the announcement:

Gentoo Linux Security Advisory GLSA 200801-16
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
http://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Severity: Normal
Title: MaraDNS: CNAME Denial of Service
Date: January 29, 2008
Bugs: #204351
ID: 200801-16

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Synopsis
========

MaraDNS is prone to a Denial of Service vulnerability impacting CNAME
resolution.

Background
==========

MaraDNS is a package that implements the Domain Name Service (DNS) with
resolver and caching ability.

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

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 net-dns/maradns lt; 1.2.12.08 gt;= 1.2.12.08

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

Michael Krieger reported that a specially crafted DNS could prevent an
authoritative canonical name (CNAME) record from being resolved because
of an "improper rotation of resource records".

Impact
======

A remote attacker could send specially crafted DNS packets to a
vulnerable server, making it unable to resolve CNAME records.

Workaround
==========

Add "max_ar_chain = 2" to the "marac" configuration file.

Resolution
==========

All MaraDNS users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose "gt;=net-dns/maradns-1.2.12.09"

References
==========

[ 1 ] CVE-2008-0061
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0061

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

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

http://security.gentoo.org/glsa/glsa-200801-16.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