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Gentoo Linux Security Advisory GLSA 200909-19
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http://security.gentoo.org/
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Severity: Normal
Title: Dnsmasq: Multiple vulnerabilities
Date: September 20, 2009
Bugs: #282653
ID: 200909-19
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Synopsis
========
Multiple vulnerabilities in Dnsmasq might result in the remote
execution of arbitrary code, or a Denial of Service.
Background
==========
Dnsmasq is a lightweight, easy to configure DNS forwarder and DHCP
server. It includes support for Trivial FTP (TFTP).
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 net-dns/dnsmasq < 2.5.0 >= 2.5.0
Description
===========
Multiple vulnerabilities have been reported in the TFTP functionality
included in Dnsmasq:
* Pablo Jorge and Alberto Solino discovered a heap-based buffer
overflow (CVE-2009-2957).
* An anonymous researcher reported a NULL pointer reference
(CVE-2009-2958).
Impact
======
A remote attacker in the local network could exploit these
vulnerabilities by sending specially crafted TFTP requests to a machine
running Dnsmasq, possibly resulting in the remote execution of
arbitrary code with the privileges of the user running the daemon, or a
Denial of Service. NOTE: The TFTP server is not enabled by default.
Workaround
==========
You can disable the TFTP server either at buildtime by not enabling the
"tftp" USE flag, or at runtime. Make sure "--enable-tftp" is not set in
the DNSMASQ_OPTS variable in the /etc/conf.d/dnsmasq file and
"enable-tftp" is not set in /etc/dnsmasq.conf, either of which would
enable TFTP support if it is compiled in.
Resolution
==========
All Dnsmasq users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose =net-dns/dnsmasq-2.5.0
References
==========
[ 1 ] CVE-2009-2957
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2957
[ 2 ] CVE-2009-2958
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2958
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200909-19.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@xxxxxxxxxx or alternatively, you may file a bug at
https://bugs.gentoo.org.
License
=======
Copyright 2009 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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