GLSA 200909-19 Dnsmasq: Multiple vulnerabilities
Posted on: 09/20/2009 10:40 PM

A new security update has been released for Gentoo Linux - Dnsmasq: Multiple vulnerabilities. Here the announcement:

Gentoo Linux Security Advisory GLSA 200909-19
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
http://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Severity: Normal
Title: Dnsmasq: Multiple vulnerabilities
Date: September 20, 2009
Bugs: #282653
ID: 200909-19

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

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 lt; 2.5.0 gt;= 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@gentoo.org 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



Printed from Linux Compatible (http://www.linuxcompatible.org/news/story/glsa_200909_19_dnsmasq_multiple_vulnerabilities.html)