Comment A lot of the "insightful" commenters don't get it (Score 1) 226
If an attacker compromises a system on your car that is connected to your CAN-BUS, then they might be able to co-opt that system into doing nasty things on your CAN-BUS. Your entertainment system probably has the biggest wireless attack surface, but more and more frequently CAN-BUS is externally accessible, as through your side mirrors, likely the case if you have mirrors that tilt in reverse, etc.
And, these aren't even theoretical vulnerabilities; entertainment system remote exploit has already been demonstrated to disable brakes, etc.:
https://www.wired.com/2015/07/...