RedHat Security Advisory RHSA-2009:1238

The remote host is missing updates announced in advisory RHSA-2009:1238. Dnsmasq is a lightweight and easy to configure DNS forwarder and DHCP server. 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.
Please note that this update is available via Red Hat Network. To use Red Hat Network, launch the Red Hat Update Agent with the following command: up2date