RHEL 5 : dnsmasq (RHSA-2009:1238)

This script is Copyright (C) 2009-2015 Tenable Network Security, Inc.

Synopsis :

The remote Red Hat host is missing a security update.

Description :

An updated dnsmasq package that fixes two security issues is now
available for Red Hat Enterprise Linux 5.

This update has been rated as having important security impact by the
Red Hat Security Response Team.

Dnsmasq is a lightweight and easy to configure DNS forwarder and DHCP

Core Security Technologies discovered a heap overflow flaw in dnsmasq
when the TFTP service is enabled (the '--enable-tftp' command line
option, or by enabling 'enable-tftp' in '/etc/dnsmasq.conf'). If the
configured tftp-root is sufficiently long, and a remote user sends a
request that sends a long file name, dnsmasq could crash or, possibly,
execute arbitrary code with the privileges of the dnsmasq service
(usually the unprivileged 'nobody' user). (CVE-2009-2957)

A NULL pointer dereference flaw was discovered in dnsmasq when the
TFTP service is enabled. This flaw could allow a malicious TFTP client
to crash the dnsmasq service. (CVE-2009-2958)

Note: The default tftp-root is '/var/ftpd', which is short enough to
make it difficult to exploit the CVE-2009-2957 issue
if a longer
directory name is used, arbitrary code execution may be possible. As
well, the dnsmasq package distributed by Red Hat does not have TFTP
support enabled by default.

All users of dnsmasq should upgrade to this updated package, which
contains a backported patch to correct these issues. After installing
the updated package, the dnsmasq service must be restarted for the
update to take effect.

See also :


Solution :

Update the affected dnsmasq package.

Risk factor :

Medium / CVSS Base Score : 6.8
CVSS Temporal Score : 5.9
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 40834 ()

Bugtraq ID: 36120

CVE ID: CVE-2009-2957