Greg Hogan | Reverse Engineering and Flashing ECU Firmware Updates | DEF CON 27 Car Hacking Village | Summary and Q&A

TL;DR

Reverse engineer Honda firmware update files, create a website to flash ECU firmware updates from web browsers, and explore the possibilities of generating custom updates.

Key Insights

• 🗯️ Right to repair laws require vehicle manufacturers to provide firmware updates for maintenance purposes at reasonable costs.
• 👨‍🔬 Greg's research and website demonstrate the possibilities of flashing ECU firmware updates from web browsers, making the process more accessible and efficient.
• 📁 The encryption and decryption of firmware update files play a crucial role in the flashing process, and Greg provides insights into reverse engineering and decrypting the Honda firmware files.
• 👻 The website's functionality allows users to select firmware update files, connect to their ECU, and flash the updates directly from their web browsers.

Transcript

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Questions & Answers

Q: How did Greg become interested in flashing ECU firmware updates?

Greg was inspired by a talk by George Hotz in 2017, where he showcased the process of obtaining firmware updates from various vehicle manufacturers. Greg was dissatisfied with the outdated and inefficient tools demonstrated and wanted to develop a more modern approach.

Q: Is it legal and safe to perform firmware modifications on car ECU?

Firmware modifications can be dangerous and potentially illegal if not done properly. Greg emphasizes the importance of not attempting any modifications that could compromise the safety of the vehicle or its occupants. He also highlights the legitimate use of firmware updates for maintenance purposes, which is supported by right to repair laws.

Q: How does the website Greg developed facilitate flashing ECU firmware updates?

The website, called auto ECU, allows users to select a firmware update file and flash it onto their ECU directly from their web browsers. It requires the use of a specific ODB2 dongle and implements the necessary protocols to communicate with the ECU.

Q: Can users generate custom firmware updates using the website?

Greg mentions that he developed a script within his RWD x-ray repository that enables users to generate custom firmware updates. However, he advises caution as modifying firmware without proper knowledge and understanding can potentially damage the ECU.

Summary & Key Takeaways

• The speaker, Greg Hogan, discusses his research on flashing ECU firmware updates from a web browser by reverse engineering Honda firmware update files.

• He explains his motivation for creating this technology after observing the limitations and inefficiencies of the existing tools.

• Greg explores the process of obtaining the necessary software and firmware updates for vehicles, highlighting the benefits of right to repair laws.

• He provides insights into the encryption and decryption of firmware update files and demonstrates the functionality of his website, which allows users to flash ECU firmware updates from their web browsers.