As Joshua Wright recently pointed out, Visa is informing merchants about similar crimes that took place around the same time in Utah. Skimmers have also been found in Florida and elsewhere. Just this week, customers of Lucky Supermarkets in California found out that a similar attack was the reason their bank accounts were recently drained. This isn't just one clever crook; this is a criminal industry at work.
The technical reasons that Bluetooth is an attractive technology for this application are nicely outlined in Joshua's article, but we wouldn't see so many actual attacks were it not for commercial availability of Bluetooth skimmers sold on the criminal underground. There is an industry producing hardware for crime just as there is an industry producing software for crime.How can you protect yourself as a customer? The best advice I can think of is to consider the liability of payment methods. There is a reason I like to carry some cash. There is also a reason I strongly prefer to use a credit card over a bank debit card. With a credit card (in the US, at least), the financial institutions and merchants bear most of the burden of liability. As long as I check for unauthorized transactions before paying my bill every month, I don't have much to worry about. Once, many years ago, someone emptied my checking account. I figured out what had happened and managed to convince my bank that the bank's own misguided security practice had allowed it to happen, but guess who bore the burden of a zero balance until that was resolved?
How can you protect yourself if you are a retailer or financial institution? This is a much more difficult problem. For starters, you should read Joshua Wright's article and the Visa bulletin. Josh has some nice things to say about my Project Ubertooth, but he also has some criticisms, mostly pointing out features yet to be developed. The first item on his wish list is frequency hopping, something I am working on now. He also points out the need to improve Bluetooth device fingerprinting, an area of research that has been advanced in recent years primarily by JP Dunning.
When I read about real life attacks on retailers and customers, sometimes I imagine how I could use technology to catch the crooks. Frankly, it would be hard, and it would be especially hard to deploy tools that would allow more investigators to do the same. Bad guys are using Bluetooth (and potentially other wireless technologies). We need Bluetooth tools for the good guys too.
I guess, if there is a lesson to be learned from all this, it is that hardware security matters. If an attacker can get in between a user and a system, the security of the system will fail in almost any case. Advocates of the Bring Your Pwn Device (BYOD) trend might want to pay attention. (That was an honest typo, but I decided to keep it!)
30 comments:
yes, even better for the bad guys is good for us.
Bluetooth was invented for the convenience of many, not for the sake of few. Let's just be vigilant with our accounts.
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