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Home » Hacking News » PGPFire Desktop Firewall ICMP Fingerprinting

PGPFire Desktop Firewall ICMP Fingerprinting

by Nikola Strahija on January 27th, 2002 When PGPfire is installed on a system, the default Windows TCP stack is replaced with a PGPfire versione. The altered TCP stack produces responses uncharacteristic of any other operating system.

This allows a remote user to fingerprint and identify sensitive systems, and could result in an organized attack against sensitive/vulnerable resources.

Currently there are no known solutions/fixes/upgrades. Our only suggestion is to use other desktop firewall solution instead of PGPfire.

Discovered by Ofir Arkin (ofir at

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