GLSA 200909-19: Dnsmasq: Multiple vulnerabilities

http://security.gentoo.org/

Severity:	normal
Title:	Dnsmasq: Multiple vulnerabilities
Date:	09/20/2009
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	Architecture(s)
net-dns/dnsmasq	< 2.5.0	>= 2.5.0	All supported architectures

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

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.