reversePromedium

IT'S ME, BURHAN!

compfest2026

Task: reverse a Java RPG service where the visible admin credential is a decoy and the real Burhan login is derived from session-dependent public sigils and stats. Solution: reconstruct `l.m()` from bytecode, compute `y` manually from observed live values with `PublicSolver2`, then log in as Burhan and decode the sealed archive by inverting the `u` transforms.

java jar java_bytecode sha256 dynamic_password game_state z3

java_bytecode_reversingmanual_state_reconstructionsymbolic_password_solvingtransform_inversionsession_reuse

$ ls tags/ techniques/

java jar java_bytecode sha256 dynamic_password game_state z3

java_bytecode_reversingmanual_state_reconstructionsymbolic_password_solvingtransform_inversionsession_reuse

Analysis

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

$ python3 exploit.py --target 192.168.1.1 --port 8080
[*] Connecting to target...
[+] Shell obtained!

Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

Permission denied (requires tier.pro)

Sign in to access full writeups

$sign in

$ cat writeup.md…

Sign in to access full writeups

Sign in to access full writeups

Similar writeups