Dynamic Quarantine of Internet Worms

  • Authors:
  • Cynthia Wong;Chenxi Wang;Dawn Song;Stan Bielski;Gregory R. Ganger

  • Affiliations:
  • Carnegie Mellon University;Carnegie Mellon University;Carnegie Mellon University;Carnegie Mellon University;Carnegie Mellon University

  • Venue:
  • DSN '04 Proceedings of the 2004 International Conference on Dependable Systems and Networks
  • Year:
  • 2004

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Abstract

If we limit the contact rate of worm traffic, can we alleviateand ultimately contain Internet worms? This papersets out to answer this question. Specifically, we are interestedin analyzing different deployment strategies of ratecontrol mechanisms and the effect thereof on suppressingthe spread of worm code. We use both analytical modelsand simulation experiments. We find that rate control at individualhosts or edge routers yields a slowdown that is linearin the number of hosts (or routers) with the rate limitingfilters. Limiting contact rate at the backbone routers,however, is substantially more effective-it renders a slow-downcomparable to deploying rate limiting filters at everyindividual host that is covered. This result holds true evenwhen susceptible and infected hosts are patched and immunizeddynamically. To provide context for our analysis, weexamine real traffic traces obtained from a campus computingnetwork. We observe that rate throttling could be enforcedwith minimal impact on legitimate communications.Two worms observed in the traces, however, would be significantlyslowed down.