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Researchers discovered an opportunity to change firmware of the V850 controller for their maliciously crafted version through the connection to multimedia system’s controller.This firmware ‘upgrade’ can be done without any checks or authorizations.But if you know the year when the car in question was manufactured and if you successfully guess the month you can bring the count down to just 15 million combinations.If you suppose the time was during the day, it gets you to about 7 million combinations.
Miller and Valasek tried to exploit this way — it took a lot of time and efforts, but these efforts weren’t fruitless.
Exploiting some pretty guessable issues in the software, they finally took control over the head unit’s system.
Possibilities of this hack are limited, but quite impressive: researchers were able to completely control the music player, set the radio to whatever station they wanted and its volume to any level.
At Black Hat USA 2015, a large security conference, researchers Charlie Miller and Chris Valasek finally explained in detail, how exactly that hack happened.
At the start of their research Miller and Valasek tried to hack the multimedia system of Jeep through Wi-Fi connection — Chrysler, the manufacturer of the vehicle, offers this option by subscription.
As it turned out, this air gap is not that thick, at least in Chrysler’s cars.