webProeasy

CoinVault Pro — Broken Authentication on Private API Endpoints

hackadvisor

Task: Cryptocurrency exchange platform with documented public/private API endpoints; admin endpoint claims to require API key + HMAC signature. Solution: The admin endpoint /api/internal/account-settings has zero authentication enforcement — a plain GET request returns full platform configuration including the master API secret (flag).

nodejs nginx express api_security cryptocurrency decoy_flag unauthenticated_access broken_authentication admin_endpoint hackadvisor

broken_access_controlapi_endpoint_enumerationdecoy_flag_recognitionunauthenticated_admin_accessapi_documentation_disclosure

$ ls tags/ techniques/

nodejs nginx express api_security cryptocurrency decoy_flag unauthenticated_access broken_authentication admin_endpoint hackadvisor

broken_access_controlapi_endpoint_enumerationdecoy_flag_recognitionunauthenticated_admin_accessapi_documentation_disclosure

Analysis

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

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