IPad Credit Card Reader Hacked As Skimmer

The Square reader for iPhone and iPad converts credit card numbers into plain audio, enabling criminals to convert stolen cards into cash.

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Security researchers have used the Square dongle to transform an iPad into a credit card skimmer.
For the uninitiated, Square turns iPads, iPhones, or iPod Touches into
mobile payment hubs
via a small, plastic dongle which enables credit cards to be swiped, and which plugs into the devices headphone jack. In conjunction with a free iOS Square application, the dongle enables people to accept in-person credit card payments. Square takes a 2.75% commission.
According to the Square website: Accept credit cards on your iPhone, iPad, or iPod Touch with no contract, monthly fees, or merchant account required. Every user receives a free Square credit card reader in the mail. Within minutes of downloading the app, youre ready to take payments. In March, CEO Jack Dorsey, who co-founded not only Square but also Twitter, said that Square was processing about $1 million per day, meaning the company could see revenue of $10 million per year.
But speaking on Thursday at
Black Hat
, a UBM TechWeb event in Las Vegas, security researchers from
Aperture Labs
in England demonstrated a hack that criminals could use to convert skimmed cards into cash, via Square. We were sitting in an airport lounge and we said, I wonder if we can fire up this application and then just feed in arbitrary data? said Adam Laurie (aka Major Malfunction), a director at Aperture Labs.
In turns out that Squares dongle converts credit card magstripe data into audio, which the iOS application then listens to and translates back into credit card numbers. Its a hack--a clever hack, said Laurie, about Squares approach. But he said it bespeaks a product that was rushed to market without necessarily considering the security repercussions, since converting Square into a platform able to read stolen credit card data took him all of 15 minutes, and 10 of that was buying a cable from Brookstone.
The hack, demonstrated at Black Hat on an iPad, works by plugging one end of a 3.5mm audio cable into the iPad, and the other into the audio output port of a laptop, running software Laurie wrote five years ago, called
Makstripe
. The software, which can be used with a card skimmer to capture swiped cards magstripe data, can also be used to play card data as audio. Accordingly, someone can input an arbitrary card number into Makstripe, and then play the number back into Square, to then charge that credit card for any amount.
Instead of needing to manually capture credit card numbers using a skimmer, a criminal could also
purchase credit card data
on the black market for as little as $2 per card, or less when purchased in bulk. You just start injecting these credit card numbers into the [Square] application, and making charges to it. Then you clear out the account on a daily basis, and when you get rumbled, you move on, said Laurie. Youd have to set up dodgy accounts that couldnt be traced back to you, but ... thats established practice for criminals, he said.
In the spirit of
responsible disclosure
, Laurie said that he notified Square about the hack in February. Their response was, we dont see this as a significant threat, and wed catch those threats through traffic analysis, he said.
Square wasnt immediately available for a request for comment, and an attendee from the company at Black Hat said he wasnt authorized to speak to the media.
What could Square have done differently to block criminals from potentially using their dongle and software as a credit card skimming platform? I would have done crypto, from day one, said Laurie. Likewise, Zac Franken, a director at Aperture Labs, said that the reader shouldnt be outputting audio, it should be outputting encrypted audio. That way, hackers couldnt play audio versions of magstripes into the Square software.
Under pressure from Visa, now a
strategic investor in Square
, the companys latest dongle (now black, as opposed to earlier versions, which are white)--reportedly encrypts credit card data. But Laurie said that at least for the moment, the Square app still accepts plaintext data.
But encryption isnt the only recommended fix for Square. Going forward, said Laurie, they need to implement the protections youd have in a full POS [point-of-sale] terminal, there needs to be a full handshake, probably
PKI
.
The vendors, contractors, and other outside parties with which you do business can create a serious security risk. Heres how to keep this threat in check. Also in the new, all-digital issue of Dark Reading: Why focusing solely on your own companys security ignores the bigger picture.
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. (Free registration required.)

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IPad Credit Card Reader Hacked As Skimmer