Fraunhofer Institut für Integrierte Publikations-und Informationssysteme IPSI

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Vulnerabilities and security limitations of current IP telephony systems

2001 , Ackermann, R. , Schumacher, M. , Roedig, U. , Steinmetz, R.

Within the traditional telephone system a certain level of quality and security has been established over the years. If we try to use IP Telephony systems as a core part of our future communication infrastructure (e.g. as classical PBX enhancement or replacement) continuous high availability, stable and error-free operation and the protection of the privacy of the spoken word are challenges, that definitely have to be met. Since manufacturers start deploying new end systems and infrastructure components rather fast now - a critical inspection of their security features and vulnerabilities is mandatory. The critical presentation of the theoretical background of certain vulnerabilities, testing and attacking tools and the evaluation results reveals, that well-known security flaws become part of implementations in the new application area again and the security level of a number of examined solutions is rather insufficient.

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Publication

Associating Network Flows with User and Application Information

2000 , Ackermann, R. , Roedig, U. , Zink, M. , Griwodz, C. , Steinmetz, R.

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Publication

VDMFA, eine verteilte dynamische Firewallarchitektur für Multimedia-Dienste

1999 , Rensing, C. , Rödig, U. , Ackermann, R. , Wolf, L. , Steinmetz, R.

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Evaluating and Improving Firewalls for IP-Telephony Environments

2000 , Roedig, U. , Ackermann, R. , Steinmetz, R.

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Publication

A Distributed Firewall for Multimedia Applications

2000 , Roedig, U. , Ackermann, R. , Rensing, C. , Steinmetz, R.

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Publication

MBone2Tel - Telephone Meeting the MBone

1999 , Ackermann, R. , Pommnitz, J. , Wolf, L. , Steinmetz, R.

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A Survey of Requirements and Standardization Efforts for IP-Telephony-Security

2000 , Rensing, C. , Roedig, U. , Ackermann, R. , Steinmetz, R.

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Using DMIF for Abstracting from IP-Telephony Signaling Protocols

2000 , Ackermann, R. , Darlagiannis, V. , Roedig, U. , Steinmetz, R.

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