Integer logic vulnerability overflows integer and results in free money:

Writeup: [https://ctf.rip/write-ups/pwn/metared-maradona123/#maradona1](https://ctf.rip/write-ups/pwn/metared-maradona123/#maradona1)

Original writeup (https://ctf.rip/write-ups/pwn/metared-maradona123/#maradona1).