Comodo Personal Firewall 2.3.6.81 relies on the Process Environment Block (PEB) to identify a process, which allows local users to bypass the product's controls on a process by spoofing the (1) ImagePathName, (2) CommandLine, and (3) WindowTitle fields in the PEB.
http://www.securityfocus.com/bid/21615
http://www.securityfocus.com/archive/1/454522/100/0/threaded
http://www.matousec.com/downloads/windows-personal-firewall-analysis/ex-coat.zip