📄 Description (English)
Draytek VigorConnect Path Traversal Vulnerability — Draytek VigorConnect contains a path traversal vulnerability in the DownloadFileServlet endpoint. An unauthenticated attacker could leverage this vulnerability to download arbitrary files from the underlying operating system with root privileges.
🤖 AI Executive Summary
CVE-2021-20123 is a critical unauthenticated path traversal vulnerability in DrayTek VigorConnect that allows attackers to download arbitrary files with root privileges. With a CVSS score of 9.0 and publicly available exploits, this poses an immediate threat to organizations using VigorConnect for remote access and VPN connectivity. Immediate patching is essential as the vulnerability requires no authentication and can lead to complete system compromise.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 19, 2026 22:58
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses severe risk to Saudi banking institutions, government agencies, and telecommunications companies that rely on DrayTek VigorConnect for secure remote access and VPN connectivity. SAMA-regulated financial institutions face critical risk of unauthorized data exfiltration and system compromise. Government entities under NCA oversight could experience breach of classified information and operational disruption. Telecom operators (STC, Mobily, Zain) and energy sector organizations using VigorConnect for remote administration face potential infrastructure compromise. Healthcare organizations using the platform for secure communications are at risk of patient data exposure.
🏢 Affected Saudi Sectors
Banking and Financial Services (SAMA-regulated)
Government and Public Administration (NCA oversight)
Telecommunications (STC, Mobily, Zain)
Energy and Utilities (ARAMCO, regional operators)
Healthcare and Medical Services
Defense and Security
Education and Research Institutions
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all DrayTek VigorConnect instances in your environment and document their versions
2. Isolate affected systems from untrusted networks immediately if patching cannot be completed within 24 hours
3. Review access logs for the DownloadFileServlet endpoint for any suspicious file download requests
4. Check for indicators of compromise: unusual file access patterns, root-level file downloads, system configuration files accessed
PATCHING GUIDANCE:
1. Apply the latest DrayTek VigorConnect security patch immediately (verify patch availability from DrayTek official channels)
2. Test patches in isolated lab environment before production deployment
3. Implement staged rollout to minimize service disruption
4. Verify patch effectiveness by confirming DownloadFileServlet path traversal is blocked
COMPENSATING CONTROLS (if immediate patching not possible):
1. Implement network-level access controls restricting VigorConnect access to trusted IP ranges only
2. Deploy WAF rules to block path traversal patterns (../, ..\, encoded variants) in HTTP requests to DownloadFileServlet
3. Disable DownloadFileServlet if not operationally required
4. Implement strict input validation and path canonicalization at network perimeter
5. Monitor all file access attempts with focus on system-critical files (/etc/passwd, /etc/shadow, configuration files)
DETECTION RULES:
1. Alert on HTTP requests containing path traversal sequences to DownloadFileServlet endpoint
2. Monitor for successful downloads of system files (size > 1KB from /etc, /root, /sys directories)
3. Track failed authentication attempts followed by unauthenticated DownloadFileServlet access
4. Log all root-level file access events from VigorConnect process
5. Implement SIEM correlation: VigorConnect process + file system access to sensitive paths
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع نسخ DrayTek VigorConnect في بيئتك وتوثيق إصداراتها
2. عزل الأنظمة المتأثرة عن الشبكات غير الموثوقة فوراً إذا لم يكن التصحيح ممكناً خلال 24 ساعة
3. مراجعة سجلات الوصول لنقطة نهاية DownloadFileServlet للبحث عن طلبات تنزيل ملفات مريبة
4. التحقق من مؤشرات الاختراق: أنماط الوصول غير العادية للملفات، تنزيلات الملفات على مستوى الجذر
إرشادات التصحيح:
1. تطبيق أحدث تصحيح أمان DrayTek VigorConnect فوراً (التحقق من توفر التصحيح من القنوات الرسمية)
2. اختبار التصحيحات في بيئة معزولة قبل النشر في الإنتاج
3. تنفيذ نشر مرحلي لتقليل انقطاع الخدمة
4. التحقق من فعالية التصحيح بتأكيد حظر ثغرة المسار في DownloadFileServlet
الضوابط البديلة (إذا لم يكن التصحيح الفوري ممكناً):
1. تنفيذ ضوابط الوصول على مستوى الشبكة لتقييد الوصول إلى VigorConnect للنطاقات الموثوقة فقط
2. نشر قواعد جدار الحماية لحجب أنماط المسار (../, ..\, المتغيرات المشفرة)
3. تعطيل DownloadFileServlet إذا لم تكن مطلوبة تشغيلياً
4. تنفيذ التحقق الصارم من المدخلات وتطبيع المسار
5. مراقبة جميع محاولات الوصول للملفات مع التركيز على الملفات الحرجة
قواعد الكشف:
1. تنبيهات على طلبات HTTP تحتوي على أنماط المسار في DownloadFileServlet
2. مراقبة التنزيلات الناجحة للملفات النظامية
3. تتبع محاولات المصادقة الفاشلة متبوعة بالوصول غير المصرح
4. تسجيل جميع أحداث الوصول للملفات على مستوى الجذر
5. تنفيذ ارتباط SIEM: عملية VigorConnect + الوصول لمسارات حساسة
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.5.1.1 - Information security policies and procedures
A.6.1.1 - Access control policy
A.6.2.1 - User registration and access rights management
A.8.1.1 - Asset inventory and ownership
A.12.2.1 - Restrictions on software installation
A.12.4.1 - Event logging
A.12.4.3 - Administrator and operator logs
A.13.1.1 - Network security perimeter
A.13.1.3 - Segregation of networks
A.14.2.1 - Secure development policy
🔵 SAMA CSF
Governance & Risk Management - Risk Assessment and Management
Information & Cybersecurity - Access Control and Authentication
Information & Cybersecurity - Data Protection and Privacy
Information & Cybersecurity - Vulnerability and Patch Management
Operational Resilience - Incident Management and Response
Operational Resilience - Business Continuity and Disaster Recovery
🟡 ISO 27001:2022
A.5.1 - Management direction for information security
A.6.1 - Screening
A.6.2 - Terms and conditions of employment
A.8.1 - Prior to employment
A.8.2 - During employment
A.8.3 - Termination and change of employment
A.12.2 - Endpoint protection
A.12.4 - Logging
A.12.6 - Management of technical vulnerabilities
A.13.1 - Network security
A.14.2 - Secure development policy and procedures
🟣 PCI DSS v4.0
Requirement 1 - Install and maintain a firewall configuration
Requirement 2 - Do not use vendor-supplied defaults
Requirement 6 - Develop and maintain secure systems and applications
Requirement 8 - Identify and authenticate access to network resources
Requirement 10 - Track and monitor all access to network resources
Requirement 11 - Regularly test security systems and processes
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
DrayTek:VigorConnect