Extracting Lego NXT Firmware and Discovering Arbitrary Code Execution Vulnerabilities
By
theblazehen
An everything bagel for the brain. Substantive, layered, well-seasoned.
Summary
The article details the process of dumping firmware from a Lego NXT Mindstorms brick, which led to the discovery of arbitrary code execution vulnerabilities. The author describes their work with the Pybricks project, a community-run port of MicroPython to Lego Mindstorms hardware, and explains how they obtained a used NXT running original 2006 firmware. The piece serves as an introduction to ARM and embedded exploit development, documenting the technical process of firmware extraction and vulnerability discovery in this educational robotics platform.
Key quotes
· 4 pulledI've recently been contributing to the Pybricks project, a community-run port of MicroPython to Lego Mindstorms hardware.
As part of that, I obtained a used Lego NXT which just so happened to still be running the original version 1.01 firmware from when it launched in 2006.
I wanted to archive a copy of this firmware, and doing so happened to involve the discovery of arbitrary code execution.
The NXT is a relatively simple exploitation target and can serve as a good introduction to ARM and embedded exploit development.
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