Security Assessment of a Car Head Unit

Case Study

Security Assessment of a Car Head Unit

We offered a proven solution to enhance the safety and digital security of high-tech cars

Business challenge of a Fortune 500 company

Our client is a German auto manufacturer with annual sales totaling millions of cars across five continents. Managing multiple brands, the company produces a wide range of internal combustion engine and electric vehicles from motorcycles, family sedans, and SUVs to high-end sports cars, work vans, and light- and heavy-duty commercial vehicles. Our client has been a longtime member of the Fortune Global 500 list and has been steadily improving their ranking year over year.

Modern cars are packed with high-tech gadgetry; they’re really interconnected information systems on wheels. Engine controls, onboard diagnostics, active safety systems, infotainment systems – the average car nowadays has more computational capacity than the guidance system of the Apollo spacecraft. And with this complexity comes increased susceptibility to hacks and privacy breaches.

With this in mind, our client wanted to perform a cybersecurity assessment of the infotainment system installed in their family car range. To that end, our client selected BitsByteSoft as their technology partner to determine overall susceptibility to intrusions into safety-critical car subsystems through insecure in-car data transmissions.

Key features

Ensure driving safety by assessing head unit vulnerabilities

Ensure driving safety by assessing head unit vulnerabilities

Verify resiliency of smartphone/vehicle communications

Verify resiliency of smartphone/vehicle communications

Detect potential CAN bus security gaps

Detect potential CAN bus security gaps

Industry: Automotive, Data Security

Headquarters: Germany

Market: Global

Team size: 4 members

Cooperation: 4 months


Arpspoof / dex2jar / IDA Pro / Java Decompiler / Kali Linux / mitmproxy / Nmap / Python / Wireshark

Solution delivered

Given the high profile of the client, for this project we engaged experienced security experts and test engineers who each hold Certified Ethical Hacking (CEH) and Offensive Security Certified Professional (OSCP) certifications. Our team’s primary task was to analyze requirements and build a strong automotive security testing strategy and eliminate security threats to automotive can networks. The actual testing involved attacks on a real car simulated at our client’s car testing site.

Our team spent about one month on-site in Germany performing a series of tests. These tests focused on assessing the safety and security of certain parts of the in-car infotainment system. We paid particular attention to certain head unit services that operate wirelessly through proprietary mobile applications. As part of our testing, we attempted to break into the car’s inner systems by intercepting and meddling with the traffic flow between a smartphone and the head unit.

Our engineers also applied reverse engineering techniques to parts of the head unit software. As a result, we checked how internal head unit services worked and learned how to better build our security tests. 

BitsByteSoft performed the following security tests on a real car: 

  • Attacks on critical car subsystems, including brakes and steering, via the head unit  
  • Investigation of the CAN bus and ways to attack it 
  • Analysis of in-car TCP/IP and Ethernet 
  • TCP-over-USB and remote attacks on services available in the same network segment 
  • Detection of insecure in-car data transmissions 
  • DoS attacks on the infotainment system 
  • Interface tests involving attacks on MirrorLink, Android Auto, and Apple CarPlay 
  • Various XML attacks on internal car services 

Business outcome

Our collaboration resulted in a comprehensive report illustrating identified vulnerabilities along with detailed proofs and descriptions of how to reproduce the attacks. For future reference during development, we provided our client with recommendations on how to enhance the security of head unit software and mobile apps for smartphone-car interactions.

Our findings helped ourclient 

  • Fix several medium to critical security issues, including one that posed a potential safety threat 
  • Re-engineer vulnerable parts of head unit software 
  • Protect their cars from DoS attacks 
  • Close potential security gaps that could be exploited for disguised discrediting attacks by dishonest competitors 
  • Build more secure architectures for future vehicle-related software products 

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