September 2024
Intermediate to advanced
408 pages
7h 29m
English
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5 Ledger Nano S, 0xF00DBABE
The Ledger Nano S is an electronic wallet for cryptocurrencies, powered by an STM32F042 microcontroller and an ST31H320 secure element. Holding one of the buttons at startup triggers a bootloader implemented in the STM32F0’s flash memory, speaking the APDU protocol over USB. Most of the STM32 firmware is open source, while the ST31 runs applets inside of a closed source supervisor.
In this chapter we’ll discuss a vulnerability, first published in Roth (2018), in which the dual mapping of flash memory allows a sanity check to be bypassed in writing firmware, so that the bootloader will mistakenly believe the code signature has already been validated.
We will also briefly cover a technique from Rashid (2018), in which ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.