M. Smart

Publications (2)2.03 Total impact

• Source

  Available from: psu.edu

  Article: Protocol scrubbing: network security through transparent flow modification

  D. Watson, M. Smart, G.R. Malan, F. Jahanian
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  ABSTRACT: This paper describes the design and implementation of protocol scrubbers. Protocol scrubbers are transparent, interposed 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. 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 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.
  IEEE/ACM Transactions on Networking 05/2004; 12(2):261- 273. · 2.03 Impact Factor
• Conference Proceeding: Protocol scrubbing: network security through transparent flowmodification

  D. Watson, M. Smart, G.R. Malan, F. Jahanian
  [show abstract] [hide abstract]
  ABSTRACT: 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 end-points. The fingerprint scrubber restricts an attacker's ability to determine the operating system of a protected host. 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 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
  DARPA Information Survivability Conference & Exposition II, 2001. DISCEX '01. Proceedings; 02/2001