Exploitation of data streams authorized by a network access control system for arbitrary data transfers: tunneling and covert channels over the HTTP protocol
by Alex Dyatlov and Simon Castro - Thursday, 3 July 2003.
This paper presents various concepts to researchers and NACS administrators to explain that each time an administrator thinks he only allows the HTTP protocol to get in and out of his internal network, he also allows arbitrary data transfers through his secured perimeter.

Download the paper in TXT format here.

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