webProeasy

Обменник «У Апишечки»

bug-makers

Task: Node.js/Express currency exchange REST API where flag is revealed when USD balance exceeds 1000. Solution: Negative amount injection bypasses insufficient funds check and increases balance via subtraction of a negative number.

nodejs input_validation business_logic session express rest_api negative_amount currency_exchange

business_logic_bypassnegative_value_injectioninsufficient_input_validation

$ ls tags/ techniques/

nodejs input_validation business_logic session express rest_api negative_amount currency_exchange

business_logic_bypassnegative_value_injectioninsufficient_input_validation

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