Latest Bluetooth attack makes short work of weak passwords

[David Farber <dave () farber net>]

Begin forwarded message:

From: Monty Solomon <monty () roscom com>
Date: June 12, 2005 3:00:33 PM EDT
To: undisclosed-recipient:;
Subject: Latest Bluetooth attack makes short work of weak passwords


Latest Bluetooth attack makes short work of weak passwords
Robert Lemos, SecurityFocus 2005-06-08

Phones, PCs and mobile devices that use the wireless Bluetooth
standard for short-range communications are open to eavesdropping
attacks if their users do not set long passwords, researchers said
this week.

The two-step attack can cause two devices to reestablish the link
between them, a process known as "pairing," and then use the data
exchanged during pairing to guess the password that secures the
connection in well under a second. A successful attack could allow an
attacker to eavesdrop and potentially issue commands to the other
device, said Avishai Wool, assistant professor of electrical
engineering at Tel Aviv University in Israel and a co-author of the
paper.

"At a minimum, it allows the attacker to eavesdrop on all the
subsequent encrypted communication between two Bluetooth devices,"
Wool said in an e-mail interview. "If the attacker can also fake his
own Bluetooth device address, he can potentially pretend to be one
device and pair with the other, which may allow him to issue
commands."

The attacker could conceivable mimic any other supported Bluetooth
device, such as a headset for a phone, he said. If the one device
could extract personal data from or issue commands to the other, then
so could the attacker.

The paper, which was presented at the MobiSys 2005 conference on
Monday, caused a stir among security experts because the technique is
the first general purpose attack to threaten Bluetooth devices. Past
attacks only worked against devices that improperly implemented
Bluetooth or under special circumstances.

The Bluetooth Special Interest Group (SIG), the organization that
sets the specifications for the standard, placed the latest attack in
the latter category, because devices that have longer, alphanumeric
PINs are effectively protected against the technique.

...

http://www.securityfocus.com/news/11202


http://www.eng.tau.ac.il/~yash/Bluetooth/


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