The fortimon.sys device driver in Fortinet FortiClient Host Security 3.0 MR5 Patch 3 and earlier does not properly initialize its DeviceExtension, which allows local users to access kernel memory and execute arbitrary code via a crafted request.
https://exchange.xforce.ibmcloud.com/vulnerabilities/40512
http://www.vupen.com/english/advisories/2008/0541/references
http://www.securitytracker.com/id?1019415
http://www.securityfocus.com/bid/27776
http://www.securityfocus.com/archive/1/488071/100/0/threaded
http://securityreason.com/securityalert/3660