Installer in Apple Mac OS X before 10.8.5 provides an option to continue a package's installation after encountering a revoked certificate, which might allow user-assisted remote attackers to execute arbitrary code via a crafted package.
Apple Security Advisory 2013-09-12-1 - OS X Mountain Lion v10.8.5 and Security Update 2013-004 is now available and addresses Apache issues, BIND issues, ClamAV issues, and more.