SMS Denial-of-Service Attack
This is a clever piece of research. Turns out you can jam cell phones with SMS messages. Text messages are transmitted on the same channel that is used to set up voice calls, so if you flood the network with one, then the other can’t happen. The researchers believe that sending 165 text messages a second is enough to disrupt all the cell phones in Manhattan.
From the paper:
ABSTRACT: Cellular networks are a critical component of the economic and social infrastructures in which we live. In addition to voice services, these networks deliver alphanumeric text messages to the vast majority of wireless subscribers. To encourage the expansion of this new service, telecommunications companies offer connections between their networks and the Internet. The ramifications of such connections, however, have not been fully recognized. In this paper, we evaluate the security impact of the SMS interface on the availability of the cellular phone network. Specifically, we demonstrate the ability to deny voice service to cities the size of Washington D.C. and Manhattan with little more than a cable modem. Moreover, attacks targeting the entire United States are feasible with resources available to medium-sized zombie networks. This analysis begins with an exploration of the structure of cellular networks. We then characterize network behavior and explore a number of reconnaissance techniques aimed at effectively targeting attacks on these systems. We conclude by discussing countermeasures that mitigate or eliminate the threats introduced by these attacks.
Neil Bartlett • October 7, 2005 8:01 AM
Here’s what would happen if the mobile phone network went down in London:
1) People would arrive 5 mins late at the pub without letting anybody know that they were going to be late. Nobody would care.
2) Schoolgirls would be unable to text each other that “JAMES FINKS UR FIT!”.
3) Stockbrokers on the train would allow their fellow passengers a little peace and quiet for once.
4) People secretly looking for a new job would have to make hushed phonecalls to recruiters from their desk rather than sneaking out to the street.
In short, life would go on just fine, thank you very much.