Feb 3, 2009

How To Crash a Nokia Phone By SMS

So now you can send an SMS and crash a mobile phone, so that the user is
locked out.

A security researcher at ITSX, has adapted a program called
sms_client, which sends an SMS message from an Internet-connected PC, in
which the User Data Header is broken.

During a presentation during the Black Hat conference last week, he
demonstrated how a malformed message crashes a Nokia 6210 phone on its
receipt. Once the message is received it is impossible to turn on an
infected phone again.

The vulnerability is tied to the software used by a phone. The flaw
affects Nokia 6210, 3310 and 3330 phones, de Haas has discovered, but not
a Siemens phone he tried. Phones from other manufacturers are yet to be
tested.

To fix the problem users have to put a SIM card into a phone without the
bug. Alternatively if the SMS message is registered in a user's In-box
this could be deleted with a SMS management tool on a PC.

To repeat the exploit requires knowledge of SS7 signalling and telco
protocols to adapt sms_client into an attack tool. But given the power of
the attack security through obscurity doesn't appeal. The kicker is that
the modified sms_client makes it trivial to spoof the source of any
attack.

Nokia told us that sending a message which freezes a phone is "something
it encountered" before. The company is unfamiliar with the exploit
uncovered by ITSX, which comes as a new twist even to clued-up Black Hat
attendees. It promises to get us a more detailed technical response, and
we'll update you when this becomes available.

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