This is an hard pwn challenge I wrote for Compete Against TeamEurope, this CTF was part of the training for ECSC2024. The vulnerability is a double-free triggerable through a race condition. No bruteforce is needed.

Pwnymalloc is a nice custom allocator challenge from UIUCTF 2024. The vulnerability was about an incorrect handling of the prev_size during consolitation.

Ret2dlresolve is a really powerful tecnique to use in pwn challenges (even tho it’s not frequently seen). It’s useful when we don’t have libc leaks or don’t know the libc version.

Simple web challenge about prototype pollution in python. It was part of the Codegate quals for juniors of 2024 (I made the writeup only because it was required to move to the finals).

Heap challenge from the Codegate quals for juniors of 2024. The vulnerability was an heap overflow that enabled an attacker to gain overlapping chunks, therefore arb read and write.

Simple AI challenge from the Codegate quals for juniors of 2024 (I made the writeup only because it was required to move to the finals).