reversehard

Rev Juice

srdnlen

Task: Verilog vending machine with hidden product 8 inaccessible via keyboard (only buttons 1-7). Solution: Reverse-engineer 12 algebraic constraints on shift register COINS_HISTORY, solve for required values, and construct cycle-accurate action sequence to trigger secret ENABLE=128 condition.

$ ls tags/ techniques/

state_machine verilog hardware_reverse shift_register constraint_system vending_machine non_blocking_assign cycle_accurate_simulation

verilog_simulationalgebraic_constraint_solvingbackward_constructioncycle_accurate_modelingshift_register_analysis

Analysis

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

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