Envoy Proxy - Metadata Disclosure Detection

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""Detected misconfigured Envoy proxy instances that disclose sensitive information about the target infrastructu."""

from kittysploit import *
from lib.protocols.http.http_client import Http_client


class Module(Scanner, Http_client):
    __info__ = {
        'name': 'Envoy Proxy - Metadata Disclosure Detection',
        'description': 'Detected misconfigured Envoy proxy instances that disclose sensitive information about the target infrastructure via the "x-envoy-peer-metadata" response header.',
        'author': ['KittySploit Team'],
        'severity': 'info',
        'tags': ['web', 'scanner', 'misconfiguration', 'envoy', 'exposure', 'misconfig', 'disclosure'],
        'agent': {
            'risk': 'active',
            'effects': ['network_probe'],
            'expected_requests': 1,
            'reversible': True,
            'approval_required': False,
            'produces': ['tech_hints', 'risk_signals', 'endpoints'],
            'cost': 1.0,
            'noise': 0.3,
            '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': 'admin_surface',
                        'from_detail': '',
                    },
                ],
                'consumes_capabilities': [],
                'option_bindings': {},
                'suggested_followups': ['auxiliary/scanner/http/login_page_detector'],
            },
        },
        'references': [
            'https://www.acunetix.com/vulnerabilities/web/envoy-metadata-disclosure/',
            'https://www.envoyproxy.io/docs/envoy/latest/configuration/configuration',
        ],
    }

    def run(self):
        r = self.http_request(method="GET", path='/', allow_redirects=False)
        if not r or r.status_code != 200:
            return False
        headers = "\n".join(f"{k}: {v}" for k, v in r.headers.items()).lower()
        header_any = ('x-envoy-peer-metadata',)
        if (any(m in headers for m in header_any)):
            self.set_info(
                severity='info',
                reason="Envoy Proxy - Metadata Disclosure detected",
                path='/',
            )
            return True
        return False