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Teslas Hackers Found Another Unauthorized Access Vulnerability


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image: Tesla

Relay attacks in cars are nothing new. Thieves have used them for years to gain unauthorized access to vehicles equipped with keyless entry and exit systems, by tricking the vehicle into thinking the precious fob is present and taking over. hold. But some forms of keyless intrusion, like Tesla’s credit card keys or BMW’s mobile phone access, have been largely unaffected by these attacks – so far.

Radio-forwarding attacks are technically complicated to execute, but conceptually easy to understand: an attacker simply needs to extend the reach of your existing key using the public radio device. high tech. A thief stands near you while you’re in the grocery store, intercepting the transmission of your key with a radio transceiver. Another person standing near your car, with another transceiver, takes the signal from their friend and transmits it to the vehicle. Since the car and the key can now talk, via the burglar’s range extender, the car has no reason to suspect the key isn’t inside – and catches on fire right away.

IOActive NFC Relay Attack – Tesla Y

But Tesla credit card keys, like many digital keys are stored in mobile phones, does not work via radio. Instead, they are based on a different protocol called Near Field Communication or NFC. Those keys were previously considered more secure, because Their range is very limited and their handshake with cars is more complicated.

Now, the researchers seems to have cracked the code. By reverse engineering the communications between the Tesla Model Y and its credit card key, they were able to properly execute a range-extending relay attack against the crossover. While this particular use case is focused on Tesla, it’s a proof of concept – the NFC handshake can and will eventually be reverse engineered.

As with RF relay attacks, the defense is simple: cut off access. Many commercial wallets, cards, and bags will act like an everyday cage for your Tesla key, restricting its communication from any nearby wells. And can think again embed that NFC tag in your arm – it may pose a legitimate security risk to your vehicle.



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