📄 Description (English)
A flaw has been found in Tenda FH451 1.0.0.9. This affects the function formWrlExtraSet of the file /goform/WrlExtraSet. This manipulation of the argument GO causes stack-based buffer overflow. The attack can be initiated remotely. The exploit has been published and may be used.
🤖 AI Executive Summary
A critical stack-based buffer overflow vulnerability exists in Tenda FH451 wireless router firmware version 1.0.0.9, affecting the WrlExtraSet function. The flaw allows remote attackers to execute arbitrary code by manipulating the 'GO' parameter, with no patch currently available. This poses significant risk to organizations relying on Tenda networking equipment for critical infrastructure connectivity.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 23, 2026 11:48
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability directly impacts Saudi telecommunications infrastructure (STC, Mobily, Zain), government networks (NCA, CITC), banking sector (SAMA-regulated institutions), and healthcare facilities. Tenda routers are widely deployed in enterprise networks, SMEs, and critical infrastructure. Successful exploitation could lead to network compromise, data exfiltration, and lateral movement into sensitive systems. The lack of available patches creates extended exposure window for Saudi organizations.
🏢 Affected Saudi Sectors
Telecommunications (STC, Mobily, Zain)
Government (NCA, CITC, Ministry networks)
Banking and Financial Services (SAMA-regulated)
Healthcare (Ministry of Health, private hospitals)
Energy (ARAMCO, power utilities)
Education (universities, research institutions)
SMEs and Enterprise Networks
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
8.5
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Tenda FH451 devices running firmware 1.0.0.9 in your network using network scanning tools
2. Isolate affected devices from critical network segments if possible
3. Implement network segmentation to limit lateral movement
4. Monitor for suspicious traffic patterns on affected devices
PATCHING GUIDANCE:
1. Check Tenda's official website for firmware updates beyond 1.0.0.9
2. If update available, schedule maintenance window for firmware upgrade
3. Verify firmware integrity using checksums before deployment
4. Test in lab environment before production deployment
COMPENSATING CONTROLS (if patch unavailable):
1. Restrict administrative access to router management interfaces (limit to specific IPs)
2. Disable remote management features if not required
3. Implement WAF/IPS rules to detect buffer overflow attempts targeting /goform/WrlExtraSet
4. Deploy network-based IDS signatures monitoring for malformed 'GO' parameter values
5. Implement strict input validation at network perimeter
DETECTION RULES:
1. Monitor HTTP POST requests to /goform/WrlExtraSet with oversized 'GO' parameters
2. Alert on unexpected process execution from router management processes
3. Track firmware version changes and unauthorized configuration modifications
4. Log all administrative access attempts to affected devices
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة Tenda FH451 التي تعمل بالإصدار 1.0.0.9 في شبكتك باستخدام أدوات المسح
2. عزل الأجهزة المتأثرة عن القطاعات الحرجة في الشبكة إن أمكن
3. تطبيق تقسيم الشبكة لتحديد الحركة الجانبية
4. مراقبة أنماط حركة المرور المريبة على الأجهزة المتأثرة
إرشادات التصحيح:
1. تحقق من موقع Tenda الرسمي للحصول على تحديثات البرامج الثابتة
2. إذا كان التحديث متاحاً، جدول نافذة صيانة لترقية البرنامج الثابت
3. تحقق من سلامة البرنامج الثابت باستخدام بصمات التجزئة
4. اختبر في بيئة المختبر قبل النشر في الإنتاج
الضوابط البديلة (إذا لم يكن التصحيح متاحاً):
1. تقييد الوصول الإداري لواجهات إدارة جهاز التوجيه
2. تعطيل ميزات الإدارة البعيدة إذا لم تكن مطلوبة
3. تطبيق قواعد WAF/IPS للكشف عن محاولات تجاوز المخزن المؤقت
4. نشر توقيعات IDS المستندة إلى الشبكة
5. تطبيق التحقق الصارم من صحة المدخلات
قواعد الكشف:
1. مراقبة طلبات HTTP POST إلى /goform/WrlExtraSet
2. التنبيه على تنفيذ العمليات غير المتوقعة
3. تتبع تغييرات إصدار البرنامج الثابت
4. تسجيل جميع محاولات الوصول الإداري
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.5.1.1 - Information Security Policies (network device management)
A.6.1.1 - Internal Organization (asset inventory and management)
A.8.1.1 - Asset Management (identification and control of network devices)
A.12.2.1 - Change Management (firmware updates and patches)
A.12.6.1 - Management of Technical Vulnerabilities (vulnerability assessment)
🔵 SAMA CSF
ID.AM-2 - Asset Management (inventory of network infrastructure)
PR.DS-6 - Data Security (access control to management interfaces)
PR.IP-1 - Security Policy (patch management procedures)
DE.CM-1 - Detection and Analysis (monitoring for exploitation attempts)
RS.MI-1 - Response and Recovery (incident mitigation procedures)
🟡 ISO 27001:2022
A.5.1 - Management Direction (information security policy)
A.8.1 - Asset Management (inventory control)
A.12.2 - Change Management (configuration control)
A.12.6 - Management of Technical Vulnerabilities (patch management)
A.13.1 - Network Security (network perimeter controls)
🟣 PCI DSS v4.0.1
Requirement 1.1 - Firewall Configuration Standards
Requirement 6.2 - Security Patches (if payment systems connected)
Requirement 11.2 - Vulnerability Scanning (network device assessment)