📄 Description (English)
Microsoft Win32k Privilege Escalation Vulnerability — Microsoft Win32k kernel-mode driver fails to properly handle objects in memory which allows for privilege escalation. Successful exploitation allows an attacker to run code in kernel mode.
🤖 AI Executive Summary
CVE-2016-7255 is a critical privilege escalation vulnerability in the Microsoft Win32k kernel-mode driver that allows attackers to execute arbitrary code in kernel mode by exploiting improper handling of objects in memory. This vulnerability has been actively exploited in the wild, notably by the APT28/Fancy Bear threat group, and has a publicly available exploit. With a CVSS score of 9.0, it poses an extreme risk to any unpatched Windows systems, enabling complete system compromise from a low-privilege position. Organizations running legacy or unpatched Windows systems are at immediate risk.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 6, 2026 12:36
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk across all Saudi sectors relying on Windows infrastructure. Government entities regulated by NCA, banking institutions under SAMA oversight, Saudi Aramco and energy sector SCADA/ICS workstations running Windows, telecom operators like STC, and healthcare systems are all at risk. Legacy Windows systems still prevalent in Saudi government agencies and critical infrastructure environments are particularly vulnerable. Given that this vulnerability was exploited by nation-state actors (APT28), Saudi organizations — especially those in defense, energy, and government — face heightened risk from advanced persistent threats targeting the region. Any system with unpatched Windows could be fully compromised, leading to data exfiltration, lateral movement, and complete domain takeover.
🏢 Affected Saudi Sectors
Government
Banking
Energy
Telecom
Healthcare
Defense
Education
Transportation
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Apply Microsoft Security Bulletin MS16-135 immediately on all Windows systems. This patch has been available since November 2016.
2. Prioritize patching on domain controllers, critical servers, and systems with internet exposure.
3. Verify patch deployment using vulnerability scanners or WSUS/SCCM compliance reports.
COMPENSATING CONTROLS (if immediate patching is not possible):
1. Implement application whitelisting to prevent unauthorized code execution.
2. Restrict local administrator privileges using least-privilege principles.
3. Enable Windows Defender Credential Guard and Device Guard where supported.
4. Segment networks to limit lateral movement from compromised endpoints.
5. Monitor for suspicious Win32k.sys activity and kernel-mode exploitation attempts.
DETECTION RULES:
1. Deploy EDR rules to detect privilege escalation attempts via Win32k driver.
2. Monitor for unusual kernel-mode code execution patterns.
3. Implement Sysmon with rules to detect process privilege escalation (Event ID 10, 1).
4. Check for known exploit signatures in IDS/IPS (Snort/Suricata rules available for CVE-2016-7255).
5. Hunt for indicators associated with APT28 tooling that leveraged this vulnerability.
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تطبيق تحديث مايكروسوفت الأمني MS16-135 فوراً على جميع أنظمة ويندوز. هذا التحديث متاح منذ نوفمبر 2016.
2. إعطاء الأولوية لتحديث وحدات التحكم بالنطاق والخوادم الحرجة والأنظمة المتصلة بالإنترنت.
3. التحقق من نشر التحديثات باستخدام أدوات فحص الثغرات أو تقارير التوافق من WSUS/SCCM.
الضوابط التعويضية (في حال عدم إمكانية التحديث الفوري):
1. تطبيق القوائم البيضاء للتطبيقات لمنع تنفيذ التعليمات البرمجية غير المصرح بها.
2. تقييد صلاحيات المسؤول المحلي باستخدام مبدأ الحد الأدنى من الصلاحيات.
3. تفعيل Windows Defender Credential Guard و Device Guard حيثما أمكن.
4. تقسيم الشبكات للحد من الحركة الجانبية من الأجهزة المخترقة.
5. مراقبة النشاط المشبوه في Win32k.sys ومحاولات استغلال وضع النواة.
قواعد الكشف:
1. نشر قواعد EDR للكشف عن محاولات تصعيد الصلاحيات عبر برنامج تشغيل Win32k.
2. مراقبة أنماط تنفيذ التعليمات البرمجية غير العادية في وضع النواة.
3. تطبيق Sysmon مع قواعد للكشف عن تصعيد صلاحيات العمليات.
4. التحقق من توقيعات الاستغلال المعروفة في أنظمة كشف ومنع التسلل.
5. البحث عن مؤشرات مرتبطة بأدوات APT28 التي استغلت هذه الثغرة.
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
2-3-1 (Patch Management)
2-5-1 (Vulnerability Management)
2-2-1 (Asset Management)
2-6-1 (Event Logs and Monitoring)
2-14-1 (Privileged Access Management)
🔵 SAMA CSF
3.3.3 (Patch Management)
3.3.5 (Vulnerability Management)
3.1.1 (Cybersecurity Risk Management)
3.3.7 (Endpoint Security)
3.4.1 (Cybersecurity Event Management)
🟡 ISO 27001:2022
A.8.8 (Management of technical vulnerabilities)
A.8.7 (Protection against malware)
A.8.15 (Logging)
A.8.2 (Privileged access rights)
A.8.9 (Configuration management)
🟣 PCI DSS v4.0
6.3.3 (Install critical security patches within one month)
5.2 (Deploy anti-malware mechanisms)
11.3 (Penetration testing)
10.6 (Review logs and security events)
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
Microsoft:Win32k