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Bluetooth DoS by obex push

Hello,

during a course project studying security and privacy related to Bluetooth, we 
discovered a simple but effective DoS attack using OBEX push.

Using ussp-push [1], it is possible to send out files very quickly. By 
continuously trying to push a &#64257;le, the target is &#64258;ooded with 
prompts whether to accept the &#64257;le or not, which disables any other usage 
on the phone, including the ability to turn off Bluetooth.
We confirmed the attack to work on the following phones:

- Sony Ericsson K700i
- Nokia N70
- Motorola MOTORAZR V3
- Sony Ericsson W810i
- LG Chocolate KG800

and expect nearly all available phones with Bluetooth to be vulnerable (in 
contrary to the previous DoS by l2ping).

A proof-of-concept code is attached, using ussp-push and targeting a known MAC. 
This could be easily extended to target all visible devices. Plus, a user could 
be forced to accept a possibly malicious file with this attack. Using only one 
Bluetooth-Dongle, we were able to practically disable three phones 
simlutaneously.

Best regards,
Stefan Ekerfelt and Armin Hornung

[1] http://www.xmailserver.org/ussp-push.html