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Comodo DLL injection via weak hash function exploitation Vulnerability

from [Matousec - Transparent security Research] Network Security [Permanent Link]
Subject: Comodo DLL injection via weak hash function exploitation Vulnerability
Date: Thu, 15 Feb 2007 12:24:12 +0100 
Hello,

We would like to inform you about a vulnerability in Comodo Firewall Pro.


Description:

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.


Vulnerable software:

    * Comodo Firewall Pro 2.4.17.183
    * Comodo Firewall Pro 2.4.16.174
    * Comodo Personal Firewall 2.3.6.81
    * 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


Regards,

--
Matousec - Transparent security Research
http://www.matousec.com/


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