📄 Description (English)
A flaw was found in Undertow. Servlets using a method that calls HttpServletRequestImpl.getParameterNames() can cause an OutOfMemoryError when the client sends a request with large parameter names. This issue can be exploited by an unauthorized user to cause a remote denial-of-service (DoS) attack.
🤖 AI Executive Summary
CVE-2024-4027 is a denial-of-service vulnerability in Undertow that allows unauthenticated attackers to trigger OutOfMemoryError by sending requests with excessively large parameter names. This high-severity flaw (CVSS 7.5) can crash Java-based web applications, impacting service availability across critical Saudi infrastructure. Immediate patching is required for all Undertow-based deployments.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: May 1, 2026 21:55
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk to Saudi banking sector (SAMA-regulated institutions), government e-services (NCA jurisdiction), healthcare systems (MOH), and telecommunications providers (STC, Mobily). Any organization using Undertow application server for customer-facing web applications faces immediate DoS risk. Energy sector (ARAMCO, SEC) and financial services relying on Java-based web frameworks are particularly vulnerable. The attack requires no authentication, making it exploitable from internet-facing systems.
🏢 Affected Saudi Sectors
Banking and Financial Services (SAMA-regulated)
Government and E-Services (NCA jurisdiction)
Healthcare (MOH systems)
Telecommunications (STC, Mobily)
Energy (ARAMCO, SEC)
Insurance
E-commerce
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
8.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Undertow deployments: grep -r 'undertow' /opt/*/pom.xml or check application server versions
2. Verify affected versions: Undertow versions prior to patched release (check vendor advisory for specific version numbers)
3. Implement WAF rules to block requests with parameter names exceeding 8KB before reaching application
4. Monitor heap memory usage and set aggressive OutOfMemoryError alerts
PATCHING:
1. Apply latest Undertow security patch immediately from vendor repository
2. Test patches in staging environment before production deployment
3. Coordinate with application teams for deployment windows
COMPENSATING CONTROLS (if patch unavailable):
1. Implement reverse proxy (nginx/Apache) with request size limits: client_max_body_size 1M; client_header_buffer_size 4k
2. Deploy WAF rules: Block requests where any single parameter name exceeds 256 characters
3. Implement rate limiting per source IP to 100 requests/minute
4. Configure JVM heap limits: -Xmx2G -XX:+HeapDumpOnOutOfMemoryError
DETECTION:
1. Monitor application logs for OutOfMemoryError patterns
2. Alert on sudden memory consumption spikes
3. IDS signature: Monitor for HTTP requests with parameter names >1KB
4. SIEM rule: Correlate OutOfMemoryError with source IP for pattern analysis
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع نشرات Undertow: grep -r 'undertow' /opt/*/pom.xml أو التحقق من إصدارات خادم التطبيقات
2. التحقق من الإصدارات المتأثرة: إصدارات Undertow السابقة للإصدار المصحح (تحقق من إشعار البائع للأرقام المحددة)
3. تنفيذ قواعد WAF لحجب الطلبات بأسماء معاملات تتجاوز 8KB قبل الوصول إلى التطبيق
4. مراقبة استخدام ذاكرة الكومة وتعيين تنبيهات OutOfMemoryError عدوانية
التصحيح:
1. تطبيق أحدث تصحيح أمان Undertow فوراً من مستودع البائع
2. اختبار التصحيحات في بيئة التدريج قبل نشر الإنتاج
3. التنسيق مع فرق التطبيقات لنوافذ النشر
الضوابط البديلة (إذا لم يكن التصحيح متاحاً):
1. تنفيذ خادم وكيل عكسي (nginx/Apache) بحدود حجم الطلب: client_max_body_size 1M; client_header_buffer_size 4k
2. نشر قواعد WAF: حجب الطلبات حيث يتجاوز أي اسم معامل واحد 256 حرفاً
3. تنفيذ تحديد معدل لكل عنوان IP مصدر: 100 طلب/دقيقة
4. تكوين حدود كومة JVM: -Xmx2G -XX:+HeapDumpOnOutOfMemoryError
الكشف:
1. مراقبة سجلات التطبيق لأنماط OutOfMemoryError
2. تنبيه على ارتفاع استهلاك الذاكرة المفاجئ
3. توقيع IDS: مراقبة طلبات HTTP بأسماء معاملات >1KB
4. قاعدة SIEM: ربط OutOfMemoryError بعنوان IP المصدر لتحليل النمط
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.12.6.1 - Management of technical vulnerabilities
A.14.2.1 - Secure development policy
A.12.2.1 - Monitoring of system use
🔵 SAMA CSF
ID.RA-1 - Asset management and criticality assessment
PR.IP-12 - Security patch management
DE.CM-1 - System monitoring and anomaly detection
🟡 ISO 27001:2022
12.6.1 - Management of technical vulnerabilities
14.2.1 - Secure development and change management
8.1.1 - Information security risk assessment
🟣 PCI DSS v4.0.1
6.2 - Security patches for system components
11.2 - Vulnerability scanning and assessment