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 &quot dhcp-script&quot option in the /etc/dnsmasq.conf configuration file did not work. This update corrects the problem and the &quot dhcp-script&quot 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) * When two or more dnsmasq processes were running with DHCP enabled on one interface, DHCP RELEASE packets were sometimes lost. Consequently, when two or more dnsmasq processes were running with DHCP enabled on one interface, releasing IP addresses sometimes failed. This ... Description truncated, for more information please check the Reference URL

dnsmasq on CentOS 6

• http://lists.centos.org/pipermail/centos-announce/2013-March/019317.html

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Updated on 2015-03-25