The carjacking software used in that study was from 2010, light years ago in terms of hacking software. (Great link, btw!)
"The research team then developed Controller Area Network (CAN) protocol sniffing software to locate, observe, monitor and subsequently take advantage of security weaknesses to bypass rudimentary protection within the car and take over aspects of control from the driver. Perhaps more worryingly, they also managed to plant malicious code which would completely erase its tracks after any crash."
