Nowadays you can buy an app for your smartphone that allows you to control your car remotely. So with your mobile phone you can unlock your car and also start the engine. But this new technology is not so safe.
The researchers discovered that, when a user pushed the unlock or remote engine start buttons on the app, the phone sends a signal to a service center, which then sends a signal to the car telling it what to do. The researchers intercepted and duplicated the signal sent to the car, afterwards using it to repeat the function.
The mobile app itself is not central to this hack, as the service center would send the same remote unlock or start code to the car if an owner were to call and request that function.
The researchers vowed not to reveal their exact method until the automakers have time to fix the security hole.