We would like to inform you about a vulnerability in Comodo Firewall Pro.
Comodo Firewall Pro (former Comodo Personal Firewall) implements a component control, which is based on a checksum comparison of process modules. Probably to achieve a better performance, cyclic redundancy check (CRC32) is used as a checksum function in its implementation. However, CRC32 was developed for error detection purposes and can not be used as a reliable cryptographic hashing function because it is possible to generate collisions in real time. The character of CRC32 allows attacker to construct a malicious module with the same CRC32 checksum as a chosen trusted module in the target system and thus bypass the protection of the component control.
* Comodo Firewall Pro 220.127.116.11 * Comodo Firewall Pro 18.104.22.168 * Comodo Personal Firewall 22.214.171.124 * 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-DLL-injection-via-weak-hash-function-exploitation.php
-- Matousec - Transparent security Research http://www.matousec.com/
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