Dnsmasq before 2.63test1, when used with certain libvirt configurations, replies to requests from prohibited interfaces, which allows remote attackers to cause a denial of service (traffic amplification) via a spoofed DNS query.
https://bugzilla.redhat.com/show_bug.cgi?id=833033
http://www.thekelleys.org.uk/dnsmasq/CHANGELOG
http://www.securityfocus.com/bid/54353
http://www.openwall.com/lists/oss-security/2012/07/12/5
http://www.mandriva.com/security/advisories?name=MDVSA-2013:072
http://rhn.redhat.com/errata/RHSA-2013-0579.html
http://rhn.redhat.com/errata/RHSA-2013-0277.html