Please Install the Updated Packages.

The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server. It was discovered that dnsmasq, when used in combination with certain libvirtd configurations, could incorrectly process network packets from network interfaces that were intended to be prohibited. A remote, unauthenticated attacker could exploit this flaw to cause a denial of service via DNS amplification attacks. (CVE-2012-3411) In order to fully address this issue, libvirt package users are advised to install updated libvirt packages. Refer to RHSA-2013:0276 for additional information. This update also fixes the following bug: * Due to a regression, the lease change script was disabled. Consequently, the dhcp-script option in the /etc/dnsmasq.conf configuration file did not work. This update corrects the problem and the dhcp-script option now works as expected. (BZ#815819) This update also adds the following enhancements: * Prior to this update, dnsmasq did not validate that the tftp directory given actually existed and was a directory. Consequently, configuration errors were not immediately reported on startup. This update improves the code to validate the tftp root directory option. As a result, fault finding is simplified especially when dnsmasq is called by external processes such as libvirt. (BZ#824214) * The dnsmasq init script used an incorrect Process Identifier (PID) in the stop, restart, and condrestart commands. Consequently, if there were some dnsmasq instances running besides the system one started by the init script, then repeated calling of service dnsmasq with stop or restart would kill all running dnsmasq instances, including ones not started with the init script. The dnsmasq init script code has been corrected to obtain the correct PID when calling the stop, restart, and condrestart commands. As a result, if there are dnsmasq instances running in addition to the system one started by the init script, then by calling service dnsmasq with stop or restart only the system one is stopped or restarted. (BZ#850944) * When two or more dnsmasq processes were running with DHCP enabled on one interface, DHCP RELEASE packets were sometimes lost. Consequently, when two or ... Description truncated, for more information please check the Reference URL

dnsmasq on Red Hat Enterprise Linux Desktop (v. 6), Red Hat Enterprise Linux Server (v. 6), Red Hat Enterprise Linux Workstation (v. 6)

• https://www.redhat.com/archives/rhsa-announce/2013-February/msg00041.html

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Updated on 2015-03-25