The Fortishield.sys driver in Fortinet FortiClient before 5.2.4 allows local users to execute arbitrary code with kernel privileges by setting the callback function in a (1) 0x220024 or (2) 0x220028 ioctl call.
https://www.exploit-db.com/exploits/45149/
https://www.exploit-db.com/exploits/41722/
https://www.exploit-db.com/exploits/41721/
http://www.securitytracker.com/id/1033439
http://www.securityfocus.com/archive/1/536369/100/0/threaded
http://www.fortiguard.com/advisory/mulitple-vulnerabilities-in-forticlient
http://www.coresecurity.com/advisories/forticlient-antivirus-multiple-vulnerabilities
http://seclists.org/fulldisclosure/2015/Sep/0
http://fortiguard.com/advisory/mulitple-vulnerabilities-in-forticlient