Tesla hackers turn to voltage glitching to unlock paywalled features
There is a way to unlock those paywalled features in your car, as a group of German PhD students demonstrated at Black Hat, but it probably won't keep the automakers up at night.given today, a trio of Technische Universität Berlin boffins demonstrated how they were able to bypass the $300 purchase requirement to activate heated rear seats in a Tesla Model 3 – or at least in the computer from a Tesla Model 3.
The researchers' first attempt was simply to try to modify the firmware in the Tesla's computer, but they were rebuffed by the secure boot process – something that Werling told us was a relatively new development in Tesla's computers. The problems were even worse before, Werling pointed out – Tesla computers used to have open X servers, hard-coded passwords, and their code wasn't even signed. Now, in 2023, Tesla computers have a boot chain of trust, firmware and OS signing and a root of trust in their AMD SoCs that left the researchers faced with a hard reality: They couldn't get in.
By soldering a couple of wires to the infotainment and connectivity ECU, which contains the gateway chip that stores settings for things like software-locked features, the team were able to get the voltage to drop at just the right time to fool the system into thinking that it was being booted securely when that wasn't necessarily the case, allowing them to gain root access to the device and unlock the heated seats.
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