runner in Install.framework in the Install Framework Legacy subsystem in Apple OS X before 10.10.4 does not properly drop privileges, which allows attackers to execute arbitrary code in a privileged context via a crafted app.
https://www.exploit-db.com/exploits/38138/
http://www.securitytracker.com/id/1032760
http://www.securityfocus.com/bid/75493
http://support.apple.com/kb/HT204942
http://packetstormsecurity.com/files/133547/OS-X-Privilege-Escalation.html
http://lists.apple.com/archives/security-announce/2015/Jun/msg00002.html