kpf4ss.exe in Sunbelt Kerio Personal Firewall 4.3.x before 4.3.268 does not properly hook the CreateRemoteThread API function, which allows local users to cause a denial of service (crash) and bypass protection mechanisms by calling CreateRemoteThread.
http://www.vupen.com/english/advisories/2006/2828
http://www.securityfocus.com/bid/18996
http://www.securityfocus.com/archive/1/440112/100/100/threaded