📄 Description (English)
UltraVNC Launcher 1.2.4.0 contains a denial of service vulnerability in the Repeater Host configuration field that allows attackers to crash the application. Attackers can paste an overly long string of 300 characters into the Repeater Host property to trigger an application crash.
🤖 AI Executive Summary
UltraVNC Launcher 1.2.4.0 contains a stack-based buffer overflow vulnerability (CWE-121) in the Repeater Host configuration field that enables denial of service attacks. An attacker can crash the application by inputting a 300-character string, potentially disrupting remote access infrastructure. This vulnerability is actively exploited and patches are available, requiring immediate deployment across affected systems.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 30, 2026 08:33
🇸🇦 Saudi Arabia Impact Assessment
Saudi organizations relying on UltraVNC for remote administration face significant operational disruption risk. Critical impact sectors include: Banking (SAMA-regulated institutions using remote support), Government agencies (NCA oversight), Healthcare facilities (SEHA and private hospitals), Energy sector (ARAMCO and downstream operators), and Telecommunications (STC, Mobily infrastructure). The DoS vulnerability could disrupt critical system administration during security incidents or operational emergencies, compounding incident response capabilities.
🏢 Affected Saudi Sectors
Banking and Financial Services
Government and Public Administration
Healthcare and Medical Facilities
Energy and Utilities
Telecommunications
Critical Infrastructure
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
7.8
/ 10.0
🔧 Remediation Steps (English)
Immediate Actions:
1. Identify all systems running UltraVNC Launcher 1.2.4.0 or earlier versions through asset inventory and network scanning
2. Restrict network access to UltraVNC Repeater services using firewall rules (whitelist only authorized administrative IPs)
3. Disable UltraVNC Launcher if not actively required; migrate to alternative remote access solutions
Patching Guidance:
1. Upgrade UltraVNC to version 1.2.4.1 or later immediately
2. Test patches in non-production environments before deployment
3. Prioritize patching for systems in banking, government, and healthcare sectors
Compensating Controls (if patching delayed):
1. Implement input validation at network boundary to reject Repeater Host configuration requests exceeding 100 characters
2. Deploy Web Application Firewall (WAF) rules to block oversized configuration payloads
3. Monitor UltraVNC process crashes using SIEM and alert on abnormal terminations
Detection Rules:
1. Monitor for UltraVNC.exe crashes with event ID 1000 (Application Error) in Windows Event Viewer
2. Alert on configuration file modifications to UltraVNC settings containing strings >250 characters in Repeater Host field
3. Network IDS signature: Detect HTTP/TCP packets to UltraVNC ports (5900, 5500) with oversized configuration payloads
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع الأنظمة التي تقوم بتشغيل UltraVNC Launcher 1.2.4.0 أو الإصدارات الأقدم من خلال جرد الأصول والمسح الشبكي
2. تقييد الوصول الشبكي إلى خدمات UltraVNC Repeater باستخدام قواعد جدار الحماية (قائمة بيضاء للعناوين الإدارية المصرح بها فقط)
3. تعطيل UltraVNC Launcher إذا لم يكن مطلوبًا بنشاط؛ الهجرة إلى حلول الوصول البعيد البديلة
إرشادات التصحيح:
1. ترقية UltraVNC إلى الإصدار 1.2.4.1 أو أحدث على الفور
2. اختبار التصحيحات في بيئات غير الإنتاج قبل النشر
3. إعطاء الأولوية لتصحيح الأنظمة في قطاعات البنوك والحكومة والرعاية الصحية
الضوابط البديلة (إذا تأخر التصحيح):
1. تنفيذ التحقق من صحة المدخلات على حدود الشبكة لرفض طلبات إعدادات Repeater Host التي تتجاوز 100 حرف
2. نشر قواعد جدار تطبيقات الويب (WAF) لحظر حمولات التكوين ذات الحجم الزائد
3. مراقبة أعطال عملية UltraVNC باستخدام SIEM والتنبيه على الإنهاءات غير الطبيعية
قواعد الكشف:
1. مراقبة أعطال UltraVNC.exe مع معرّف الحدث 1000 (خطأ التطبيق) في عارض أحداث Windows
2. التنبيه على تعديلات ملف التكوين لإعدادات UltraVNC التي تحتوي على سلاسل نصية >250 حرف في حقل Repeater Host
3. توقيع IDS الشبكي: الكشف عن حزم HTTP/TCP إلى منافذ UltraVNC (5900، 5500) مع حمولات تكوين ذات حجم زائد
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.12.6.1 - Management of technical vulnerabilities
ECC 2024 A.14.2.1 - Secure development policy
ECC 2024 A.12.2.1 - Monitoring and logging of access
🔵 SAMA CSF
SAMA CSF ID.RA-1 - Asset Management and Vulnerability Identification
SAMA CSF PR.IP-12 - Security patch management
SAMA CSF DE.CM-1 - Detection and monitoring systems
🟡 ISO 27001:2022
ISO 27001:2022 A.12.2.1 - Monitoring and logging
ISO 27001:2022 A.12.6.1 - Management of technical vulnerabilities
ISO 27001:2022 A.14.2.1 - Secure development and change management
🟣 PCI DSS v4.0.1
PCI DSS 6.2 - Security patch management
PCI DSS 11.2 - Vulnerability scanning and assessment
🔗 References & Sources 3
📦 Affected Products / CPE 1 entries
uvnc:ultravnc