https://app.hackthebox.com/challenges/352

Description

You arrive on a barren planet, searching for the hideout of a scientist involved in the Longhir resistance movement. You touch down at the mouth of a vast cavern, your sensors picking up strange noises far below. All around you, ancient machinery whirrs and spins as strange sigils appear and change on the walls. You can tell that this machine has been running since long before you arrived, and will continue long after you’re gone. Can you hope to understand its workings?

Exploitation

#!/usr/bin/env python3

encrypted = [
    41, 56, 43, 30, 6, 66, 5, 93, 7, 2, 49, 16, 81, 8, 90, 22,
    49, 66, 15, 51, 10, 85, 0, 0, 21, 30, 28, 6, 26, 67, 19, 89, 20, 0
]
key = "aliens"
password = ""
for i in range(32):
    decrypted_char = chr(encrypted[i] ^ ord(key[i % 6]))
    password += decrypted_char
print(f"Password: {password}" + "}")

Summary

Rebuilding: build the exploit primitive, stabilize the payload, and use it to read the flag.