Hijack passing car's Bluetooth

Carlo Longino, guestblogging this week at Gizmodo, posts about the Car Whisperer hack to hijack a car's Bluetooth. Carlo writes:

The Car Whisperer (is) a tool that lets somebody with a Linux laptop and a directional antenna send audio to nearby cars with Bluetooth handsfree systems that aren't being used. Many built-in systems use just a standard, widely known passkey as the only form of authentication that's needed. While some people see that as a security risk, it's merely an invitation to invade a passing car's stereo and ask the driver how he manages to steer with his head stuck where the sun don't shine.

Link