February 25, 2004
Bluesnarfing: Serious Bluetooth Security Flaw
First there was Bluejacking, which was more or less harmless pranking via Bluetooth-enabled cell phones.
Bluesnarfing, on the other hand, is much more serious. (Don't look at me, I didn't make up these names -- ironically Bluesnarfing is closer to real Bluetooth hijacking.) CNet News reports in this article how a number of Nokia cell phones are the most susceptible.
Bluesnarfing is a security flaw in Bluetooth implementations in which an attacker exploits it "to read, modify and copy a phone's address book and calendar without leaving any trace of the intrusion." "According to Nokia, if an attacker had physical access to a 7650 model, a bluesnarf attack would not only be possible, but it would also allow the attacker's Bluetooth device to 'read the data on the attacked device and also send SMS messages and browse the Web via it.' " Furthermore, Nokia stated "that its 6310i handset is vulnerable to a denial-of-service attack when it receives a "corrupted" Bluetooth message."
As Dana Carvey would probably say, "Well now, isn't that special?" Wireless convenience just inherently introduces more security issues.
Per AL Digital, the security company that discovered the flaw, it affects some Sony Ericsson, Ericsson, and Nokia handsets. However, the Nokia 6310, 6310i, 8910 and 8910i phones are at greater risk because they invite attack even when in "invisible mode". FYI, in invisible mode, "the handset is not supposed to broadcast its identity and should refuse connections from other Bluetooth devices." Whoops.
I've been a big fan of Nokia phones. Compared to others I've had, their business class phones have been generally more rugged and have better sound quality. I've even read posts from Nokia owners who've run them over with their car, put them through the washer and dryer, and they still worked. However, until Nokia provides a fix for this, I'm going to stay away from their Bluetooth phones as a precaution. That's the real shame, as Bluetooth was just finally beginning to deliver on much of the hype we've heard over the past several years.