OTW Advent CTF 2018: nightmare Writeup

This is a writeup for nightmare, the day 23 challenge for the OverTheWire Advent CTF. The problem was a 350 point ARM exploitation challenge and had 8 solves by the end of the CTF. You can find the binary and the supplied libraries here. In short, my solution was to overwrite the top chunk size by getting another heap chunk to overlap it, followed by using the House of Force exploitation technique to overwite a GOT pointer to point to system.

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