Re: Need to apply basic secure design principles.
Couple of things:
1. J1939 is used mainly on trucks and heavy vehicles, cars tend to run a variation of CANopen, usually with a customer specific protocol.
2. Cars tend to have separate ECU's rather than a monolithic brain, some OEM's are investigating this approach, but it is not in general use, generally as the various sub-systems are supplied by different manufacturers.
3. Most run multiple ETHERNET/FLEXRAY/CAN-FD/CAN/LIN buses for various tasks.
The question mark is over the programming mechanisms, given some modern vehicles offer OTA updates, via the infotainment systems, this is probably the primary weak spot.
Biting the hand that feeds IT
