Exploring the Vulnerabilities Sample Clauses

Exploring the Vulnerabilities. ‌ In the deliverables of this thesis work can be found the MITM hardware platform (Raspberry Pi), as well as an application (small scale CAN bus fuzzer) which will be used to perform the vulnerability analysis (MITM attack scerario). The flow chart in Figure 5.1 is a good representation, on how the attack flow shall look like and it is based on the developed application. The software is divided in 4 different parts and the user can choose, how wants to perform the exploit. The first option is to capture traffic and save it log file in order to further analyze it offline. In the second option the attack scenario is com- plitely automated. The used chooses to capture and transmit traffic (user inputs the amount of captured frames) on the CAN bus and the application performs these actions. As third option the user can replay an already existing log file. The final option for the user it is to generate random CAN IDs and paylod and transmit on the bus. This option it is appropriate, when the user has very limited knowledge for the CAN network and wants to test randomly generated IDs. It shall mentioned, that the generate or captured traffic it is saved in a log file. An- other interesting part, it is how the application produces random payloads. When the application has captured CAN frames, extracts the CAN IDs and generates Figure 5.1: Attack Flow Chart CAN frames with random payload data. The CAN frames which are generated, are then transmitted on the bus. The same holds, for the randomly generated IDs. Raspberry Pi with the CAN bus module was an excellent choice for the needs of this experiment as MITM. The application was developed in Python and it is transferable in between platforms, which are using the same hardware setup. It is also worth to be mentioned that, the CAN module was able to deliver frames in high rate towards the IC. The IC, which have been used in order to verify the hypothesis can be consid- ered vulnerable. This is due to not using cyclic redundancy check (CRC) and also does not provide input data validation [44] [45]. In the following flow chart 5.2 we assume that, the first step is the generation of the random payload (taken from the attack flowchart 5.1) and follow the next steps, as it has been observed during the experiment. The IC has 2 type of behaviors during the attack/analysis as in Figure 5.2. When it receives a small amount (100-1000) of altered CAN frames, the normal behavior it is changing but most of the times (80-90%) it...
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