Title: Intrusion Detection System for Denial-of-Service flooding attacks in SIP communication networks

Authors: Sven Ehlert, Yacine Rebahi, Thomas Magedanz

Addresses: Fraunhofer FOKUS, Kaiserin-Augusta-Allee 31, 10589 Berlin, Germany. ' Fraunhofer FOKUS, Kaiserin-Augusta-Allee 31, 10589 Berlin, Germany. ' Fraunhofer FOKUS, Kaiserin-Augusta-Allee 31, 10589 Berlin, Germany

Abstract: Security threats to Voice-over IP (VoIP) or IP Multimedia Subsystem (IMS) networks are becoming a major concern as their popularity increases. New attacks are being developed that directly target the underlying SIP protocol. To detect such kinds of attacks we are presenting a specification-based Intrusion Detection System (IDS) to recognise deviation from its expected protocol behaviour. We will present an implementation and show with measurements that this method is capable of attack detection and mitigation for different kinds of attacks directed towards a SIP infrastructure, with a focus on Denial-of-Service (DoS) message flooding.

Keywords: SIP; session initiation protocol; VoIP; voice-over IP; flooding attacks; DoS; denial-of-service; IDS; intrusion detection systems; state machines; attack mitigation; security threats; IP multimedia subsystems.

DOI: 10.1504/IJSN.2009.027344

International Journal of Security and Networks, 2009 Vol.4 No.3, pp.189 - 200

Published online: 20 Jul 2009 *

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