Re: Physical access
I suppose one thing would be the next take-down of half the Internet could be done by cars instead of IP cameras.
But, imagine if you will, suddenly making a bunch of cars of a particular model shut down at the same time, or they activate the braking system all at once on various Interstates. Obviously that all depends upon what additional systems can be accessed, but if car designers take the TJX or Target approach that nothing bad can happen inside a protected network, well, there are all sorts of shenanigans which can ensue.
While the espionage angle of killing a journalist of political staffer without traces of foul play may sound outlandish, maybe taking that a little further in realizing in its most useful mode car is a ton and a-half missile. And I am not talking about the back seat on a hill top. Since we are becoming more and more dependent upon technologies like lane keeping, blind-spot monitoring, object avoidance and, eventually, self-driving, the uses for taking over a system using the defects in a modem are pretty evident.
For that matter, I wonder what happens if we start sending malformed GPS signals to cars with built-in navigation. Even the car I am driving right now (not while typing this, mind you) without navigation can use the built-in GPS to set the clock, and when paired with my phone it can place an emergency call including my GPS coordinates in the event of an incapacitating accident. So, what about mishandling malformed GPS input when the unit is receiving an updated almanac?
Anyway, that is just thinking about another vector into a potentially unprotected system, but gaining access to a car's systems, even "non-critical" ones like oil pressure or temperature sensing, speed indication, hood release, and so on could cause a great deal of mischief.