webmedium

Rickroll

alfactf

Task: Rickroll Detector game with 50 shortened links, need 20+ coins to win. Solution: Exploited predictable RNG seed (time in milliseconds) by bruteforcing seeds to predict which links are safe vs rickroll.

$ ls tags/ techniques/

game_hacking fastapi python rng random_seed time_based_seed prediction

predictable_rng_attackseed_bruteforcegame_state_prediction

Analysis

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

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