‘ISS BlackICE PC Protection Filelock Protection Bypass’

Summary

”BlackICE PC Protection scans all inbound Internet traffic for suspicious activity on home or small business systems and stops it cold.’

The list of protected files is stored in filelock.txt in the BlackICE installation directory. If this file is deleted files mentioned in filelock.txt are not protected any more and can be changed by malicious applications.’

Credit:

‘The information has been provided by Matousec.
For the original advisory please visit: http://www.matousec.com/info/advisories/BlackICE-Filelock-protection-bypass.php.’


Details

Vulnerable Systems:
 * BlackICE PC Protection 3.6.cpu
 * BlackICE PC Protection 3.6.cpj
 * Possibly other versions of BlackICE PC Protection 3.6 (and below).

Description:
BlackICE PC Protection protects its files against manipulation by malicious software. Its critical files like its
database of trusted applications or firewall configuration are protected. The list of protected files is stored in
filelock.txt in the BlackICE installation directory. If this file is deleted files mentioned in filelock.txt are not
protected any more and can be changed by malicious applications. The implemented protection allows malicious
applications to delete this file using native API function ZwDeleteFile. This can result in a bypass of all BlackICE
protection mechanisms because its internal componenets can be replaced with fake copies. The situation is even easier
for the attacker because the component control fails to recognize fake components in BlackICE processes.

A proof of concept including source code is available here:
http://www.matousec.com/info/advisories/BlackICE-Filelock-protection-bypass.php

Categories: Windows