September 2024
Intermediate to advanced
408 pages
7h 29m
English
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10 STM32F0 SWD Word Leak
Many microcontrollers allow for some sort of partial locking mode, in which a debugger may be attached but code is still protected. On the STM32 family, this corresponds to RDP Level 1, where flash memory is disconnected after the debugger connects. This chapter describes a vulnerability in the STM32F0 series, in which flash memory is disconnected two clock cycles too late. A carefully orchestrated debugger can dump one word per connection.
This vulnerability was first described at Usenix WOOT, near the end of Obermaier and Tatschner (2017).
The Bug
As we discussed in Chapter 2, STM32’s readout device protection (RDP) feature has three levels. Level 0 is unprotected, while Level 2 is a total JTAG lockout, rejecting all ...
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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.