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diff --git a/security-blueprint/part-7/1-BusAndConnectors.md b/security-blueprint/part-7/1-BusAndConnectors.md deleted file mode 100644 index 5ab9ab8..0000000 --- a/security-blueprint/part-7/1-BusAndConnectors.md +++ /dev/null @@ -1,68 +0,0 @@ -# Bus - -We only speak about the **CAN** bus to take an example, because the different -attacks on bus like _FlewRay_, _ByteFlight_, _Most_ and _Lin_ use retro -engineering and the main argument to improve their security is to encrypt data -packets. We just describe them a bit: - -- **CAN**: Controller Area Network, developed in the early 1980s, is an - event-triggered controller network for serial communication with data rates - up to one MBit/s. **CAN** messages are classified over their respective - identifier. **CAN** controller broadcast their messages to all connected nodes - and all receiving nodes decide independently if they process the message. -- **FlewRay**: Is a deterministic and error-tolerant high-speed bus. With a data - rate up to 10 MBit/s. -- **ByteFlight**: Is used for safety-critical applications in motor vehicles - like air-bags. Byteflight runs at 10Mbps over 2 or 3 wires plastic optical - fibers. -- **Most**: Media Oriented System Transport, is used for transmitting audio, - video, voice, and control data via fiber optic cables. The speed is, for the - synchronous way, up to 24 MBit/s and asynchronous way up to 14 MBit/s. - **MOST** messages include always a clear sender and receiver address. -- **LIN**: Local Interconnect Network, is a single-wire subnet work for - low-cost, serial communication between smart sensors and actuators with - typical data rates up to 20 kBit/s. It is intended to be used from the year - 2001 on everywhere in a car, where the bandwidth and versatility of a **CAN** - network is not required. - -On just about every vehicle, **ECU**s (**E**lectronic **C**ontrol **U**nits) -communicate over a CAN bus, which is a two-wire bus using hardware arbitration -for messages sent on the shared medium. This is essentially a *trusted* network -where all traffic is visible to all controllers and any controller can send any message. - -A malicious **ECU** on the CAN bus can easily inject messages destined for any -other device, including things like the instrument cluster and the head unit. -There are common ways for hardware to do USB to CAN and open source software to send -and receive messages. For example, there is a driver included in the Linux kernel -that can be used to send/receive CAN signals. A malicious device on the CAN bus can -cause a great number of harmful things to happen to the system, including: sending -bogus information to other devices, sending unintended commands to ECUs, -causing DOS (Denial Of Service) on the CAN bus, etc. - -<!-- section-config --> - -Domain | Tech name | Recommendations ----------------------------------- | --------- | -------------------------------------------------------------------------- -Connectivity-BusAndConnector-Bus-1 | CAN | Implement hardware solution in order to prohibit sending unwanted signals. - -<!-- end-section-config --> - -See [Security in Automotive Bus Systems](http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.92.728&rep=rep1&type=pdf) for more information. - -# Connectors - -For the connectors, we supposed that they were disabled by default. For example, -the **USB** must be disabled to avoid attacks like BadUSB. If not, configure the -Kernel to only enable the minimum require **USB** devices. The connectors used -to diagnose the car like **OBD-II** must be disabled outside garages. - -<!-- section-config --> - -Domain | Tech name | Recommendations ------------------------------------------ | --------- | ---------------------------------------------------------------------- -Connectivity-BusAndConnector-Connectors-1 | USB | Must be disabled. If not, only enable the minimum require USB devices. -Connectivity-BusAndConnector-Connectors-2 | USB | Confidential data exchanged with the ECU over USB must be secure. -Connectivity-BusAndConnector-Connectors-3 | USB | USB Boot on a ECU must be disable. -Connectivity-BusAndConnector-Connectors-4 | OBD-II | Must be disabled outside garages. - -<!-- end-section-config --> |