[ GLSA 200801-16 ] MaraDNS: CNAME Denial of Service
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Gentoo Linux Security Advisory GLSA 200801-16
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http://security.gentoo.org/
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Severity: Normal
Title: MaraDNS: CNAME Denial of Service
Date: January 29, 2008
Bugs: #204351
ID: 200801-16
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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 < 1.2.12.08 >= 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 ">=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
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