Integer overflow in libresolv in Apple Mac OS X before 10.7.3 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption and application crash) via crafted DNS data.
http://www.securitytracker.com/id?1026774
http://support.apple.com/kb/HT5130
http://secunia.com/advisories/48289
http://secunia.com/advisories/48288
http://lists.apple.com/archives/security-announce/2012/Mar/msg00002.html
http://lists.apple.com/archives/security-announce/2012/Mar/msg00001.html
http://lists.apple.com/archives/security-announce/2012/Feb/msg00000.html