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Defcon Quals writeup for byhd (reversing a Huffman Tree)

This is my writeup for byhd, a 2-point challenge from the Defcon Qualifier CTF. You can get the files, including my annotated assembly file, here. This is my second (and final) writeup for the Defcon Qualifiers, you can find the writeup for shitsco here. This was a reverse engineering challenge where code would be constructed […]

Defcon Quals writeup for Shitsco (use-after-free vuln)

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Hey folks, Apparently this blog has become a CTF writeup blog! Hopefully you don't mind, I still try to keep all my posts educational. Anyway, this is the first of two writeups for the Defcon CTF Qualifiers (2014). I only completed two levels, both of which were binary reversing/exploitation! This particular level was called "shitsco", […]