If you've got this dealer-installed car alarm, patch it today with your iPhone

Millions of drivers with a dealer-installed KARR alarm should download the iPhone app and install the latest firmware update now, because a security flaw can let nearby attackers unlock or immobilize more than two million vehicles.Bluetooth vulnerability
The affected KARR Security System is an aftermarket alarm that dealerships install to protect vehicles on their lots. Dealers often leave the hardware connected after a vehicle is sold, even when the buyer declines to pay for the alarm service.T