Lab 179 — VaultPay — Race Condition in Fund Transfer

hackadvisor

Task: VaultPay banking platform with wallet-to-savings transfers; need $2000 in savings but only $500 total. Solution: exploit TOCTOU race condition in POST /api/transfer by firing 200 concurrent threads to duplicate funds past the balance check.

race_condition toctou balance_manipulation express concurrent_requests threading session_cookies decoy_flag wallet fund_transfer banking

concurrent_http_floodingmoney_duplicationrace_condition_exploitationsession_cookie_sharingthread_barrier_synchronizationtoctou_transfer_bypass

$ ls tags/ techniques/

race_condition toctou balance_manipulation express concurrent_requests threading session_cookies decoy_flag wallet fund_transfer banking

concurrent_http_floodingmoney_duplicationrace_condition_exploitationsession_cookie_sharingthread_barrier_synchronizationtoctou_transfer_bypass

Analysis

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

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