pwnmedium

hxp 39C3 CTF - brainfast

hxp_39c3

Task: exploit a Brainfuck JIT compiler running on Alpine Linux (musl libc). Solution: leverage the out-of-bounds pointer access (initial pointer is outside the tape) to write shellcode into memory where the JIT buffer will be allocated, then trigger JIT compilation to execute it.

$ ls tags/ techniques/
🔒

Permission denied (requires tier.pro)

Sign in to access full writeups

Create a free account with GitHub, then upgrade to Pro.

$ssh [email protected]