Nerdy (and long) but interesting article on network vulnerabilities in modern cars.
 

Basically, with all of the CPUs in use now in modern cars, there are security issues that need to be addressed. A very nerdy read, but interesting.

Linux and automotive computing security [LWN.net]

I'd be more worried about the remote attacks now possible on medical equipment

Malware Is 'Rampant' On Medical Devices In Hospitals - Slashdot

and against pacemakers

Researcher Reverse-Engineers Pacemaker Transmitter To Deliver Deadly Shocks - Slashdot

love it-

I guess my 85 911 an 86 El Camino are safe from automotive viruses. The medical industry need to get on top of that RIGHT NOW.

I am reminded (rather painfully) of Repo Men, a.k.a. Repossession Mambo.

GM sold mandatory integrated On-star as saving your wife and daughter from a flash flood while crashed upside down in a ditch...Track all your driving by satellite, remote accessed microphone, remote unlocking doors.

The public didn't blink.
The public didn't riot in the streets.
The public didn't stop buying them.

Tinfoil hat is secure:
Hackers can unlock cars via SMS | ExtremeTech

try to hack my 1966, 912-
ha-
next I just need 55 gal drums of non ethanol gasoline stashed away for hacker day-

Good read's.

Of the opposite, reminds me of years ago we purposely made an electrical shocker for the car door handle. Very easy to make but won't spill too much of the details. You can make a single shot zap using a high load capacitor or go continuos with a 12v to 120v inverter. Call it cruel and illegal if you must but I'm tempted to do one again for fun on a 911. Bait the bandits and catch the laughs on camera.