Heap

This weekend I played my first CTF of the year : the 0XFFUN CTF. I actually only played for some hours but managed to solve two “hard” challenges Warden and 67 Revenge :) This is my writeup for 67 Revenge TLDR Vulnerability Leak Heap and Libc Heap Spray House of Einherjar Leak Stack Ropchain While the challenge was ranked as hard on the CTF, it’s a fairly standard heap challenge exploitation where I got stuck mainly because someone that will recognise himself told me consolidation was impossible on strange things and stuff that shows my lack of recent practice on heap exploits. ...

This post is part of my training on hackropole, a french platform that hosts the challenges from the FCSC : an annual competition CTF in France lasting 10 days. The challenges from Hackropole are quite interesting and managing to solve the 3 Stars challenges show really good skills. For my training I focused on the FCSC of this year (2025) and tried to time myself on the challenges to see how long it takes me to do them as a way to evaluate how I’d fare in the real competition. ...