A Self-learning System for Detection of Anomalous SIP Messages

  • Authors:
  • Konrad Rieck;Stefan Wahl;Pavel Laskov;Peter Domschitz;Klaus-Robert Müller

  • Affiliations:
  • Fraunhofer Institute FIRST, Intelligent Data Analysis, Berlin, Germany;Bell Labs Germany, Alcatel-Lucent, Stuttgart, Germany;Fraunhofer Institute FIRST, Intelligent Data Analysis, Berlin, Germany and University of Tübingen, Wilhelm-Schickard-Institute, Germany;Bell Labs Germany, Alcatel-Lucent, Stuttgart, Germany;Fraunhofer Institute FIRST, Intelligent Data Analysis, Berlin, Germany and Dept. of Computer Science, Technical University of Berlin, Germany

  • Venue:
  • Principles, Systems and Applications of IP Telecommunications. Services and Security for Next Generation Networks
  • Year:
  • 2008

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Abstract

Current Voice-over-IP infrastructures lack defenses against unexpected network threats, such as zero-day exploits and computer worms. The possibility of such threats originates from the ongoing convergence of telecommunication and IP network infrastructures. As a countermeasure, we propose a self-learning system for detection of unknown and novel attacks in the Session Initiation Protocol (SIP). The system identifies anomalous content by embedding SIP messages to a feature space and determining deviation from a model of normality. The system adapts to network changes by automatically retraining itself while being hardened against targeted manipulations. Experiments conducted with realistic SIP traffic demonstrate the high detection performance of the proposed system at low false-positive rates.