[Full-disclosure] Comodo Multiple insufficient argument validation of hooked SSDT function Vulnerability


Hello, We would like to inform you about a vulnerability in Comodo Firewall Pro. Description: Comodo Firewall Pro (former Comodo Personal Firewall) hooks many functions in SSDT and in at least seven cases it fails to validate arguments that come from the user mode. User calls to NtConnectPort (CFP is not affected), NtCreatePort (CFP is not affected), NtCreateSection, NtOpenProcess, NtOpenSection, NtOpenThread and NtSetValueKey with invalid argument values can cause system crashes because of errors in CFP driver cmdmon.sys. Further impacts of this bug (like arbitrary code execution in the kernel mode) were not examined. Vulnerable software: * Comodo Firewall Pro * Comodo Personal Firewall * probably all older versions of Comodo Personal Firewall 2 * possibly older versions of Comodo Personal Firewall More details and a proof of concept including its source code are available here: http://www.matousec.com/info/advisories/Comodo-Multiple-insufficient-argument-validation-of-hooked-SSDT-functions.php Regards, -- Matousec - Transparent security Research http://www.matousec.com/ _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/