The code-signing implementation in Apple OS X before 10.10.4 does not properly consider libraries that are external to an application bundle, which allows attackers to bypass intended launch restrictions via a crafted library.
http://www.securitytracker.com/id/1032760
http://www.securityfocus.com/bid/75493
http://support.apple.com/kb/HT204942
http://lists.apple.com/archives/security-announce/2015/Jun/msg00002.html