Among all the things you could acquisition at MCH2022, there were a few CTFs (Capture The Banderole exercises) – in particular, every brand independent an appliance that you could try and breach into – alone two teams accept absurd this one! [dojoe] was allotment of one of them, and he has composed an all-encompassing reverse-engineering adventure for us – complete with Ghidra disassembly of Xtensa code, alien cipher beheading attempts, ROP apparatus creation, and no detail larboard aside.
There was a catch: badges handed out to the participants didn’t accommodate the absolute flag. You had to advance an accomplishment application your claimed brand that alone independent a placeholder flag, again go to the brand covering and administer your accomplishment over the arrangement to one of the few badges with the absolute banderole on them. The app in catechism angry out to be an answer server – sending aback aggregate it received; notably, assertive letters fabricated it crash. One man’s crashes are addition man’s accomplishment possibilities, and afterwards a few hacking sessions, [dojoe]’s aggregation got their well-deserved abode on the scoreboard.
If you consistently anticipation that firmware reverse-engineering sounds cool, and you additionally appear to own a MCH2022 badge, you should try and chase the intricately accurate achieve of [dojoe]’s writeup. Even for bodies with little low-level programming experience, repeating this drudge is astute acknowledgment to his all-encompassing explanations, and you will leave with way added reverse-engineering acquaintance than you had before.
The MCH2022 brand is a featureful conception of intricate engineering, with the ESP32 allocation alone actuality allotment of the brand – we’re acquisitive to apprehend about what you’ve able or are about to achieve accustomed aggregate it has to offer!
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