Protocol scrubbing: network security through transparent flow modification using active real time database

  • Authors:

  • S. N. Gujar;S. R. Gupta;M. S. Ali

  • Affiliations:

  • University of Pune, India;Prof. Ram Meghe Institute of Technology & Research, Badnera(C. Rly), India;Prof. Ram Meghe Institute of Technology & Research, Badnera(C. Rly), India

  • Venue:
  • Proceedings of the International Conference and Workshop on Emerging Trends in Technology
  • Year:
  • 2010

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Abstract

This paper describes the design and implementation of protocol scrubbers. Protocol scrubbers are transparent, active interposition mechanisms for explicitly removing network scans and attacks at various protocol layers. The transport scrubber supports downstream passive network-based intrusion detection systems by converting ambiguous network flows into well-behaved flows that are unequivocally interpreted by all downstream endpoints. The fingerprint scrubber restricts an attacker's ability to determine the operating system of a protected host and the fingerprint we stored in real time database. As an example, this paper presents the implementation of a TCP scrubber that eliminates insertion and evasion attacks -- attacks that use ambiguities to subvert detection -- on passive network-based intrusion detection systems, while preserving high performance. The TCP scrubber is based on a novel, simplified state machine that performs in a fast and scalable manner. The fingerprint real time database scrubber is built upon the TCP scrubber and removes additional ambiguities from flows that can reveal implementation-specific details about a host's operating system.