📄 Description (English)
Microsoft Windows Installer Privilege Escalation Vulnerability — Microsoft Windows Installer contains an unspecified vulnerability that allows for privilege escalation.
🤖 AI Executive Summary
CVE-2021-41379 is a critical privilege escalation vulnerability in Microsoft Windows Installer affecting Windows systems globally. With a CVSS score of 9.0 and publicly available exploits, this vulnerability allows attackers to escalate privileges from standard user to SYSTEM level. Immediate patching is essential for all Saudi organizations running Windows infrastructure.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 21, 2026 09:15
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses severe risk to Saudi banking sector (SAMA-regulated institutions), government agencies (NCA oversight), healthcare facilities, energy sector (ARAMCO and subsidiaries), and telecommunications providers (STC, Mobily). Windows Installer is ubiquitous across enterprise environments in Saudi Arabia. Attackers could gain SYSTEM-level access to critical infrastructure, potentially compromising financial systems, government networks, healthcare records, and energy management systems. The availability of public exploits significantly increases attack likelihood.
🏢 Affected Saudi Sectors
Banking and Financial Services
Government and Public Administration
Healthcare and Medical Facilities
Energy and Utilities
Telecommunications
Critical Infrastructure
Education
Retail and E-commerce
🎯 MITRE ATT&CK Techniques
T1548.002 - Abuse Elevation Control Mechanism: Bypass User Account Control
T1548.004 - Abuse Elevation Control Mechanism: Elevated Execution with Prompt
T1547.001 - Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder
T1547.014 - Boot or Logon Autostart Execution: Active Setup
T1059.001 - Command and Scripting Interpreter: PowerShell
T1218.007 - System Binary Proxy Execution: Msiexec
T1204.002 - User Execution: Malicious File
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Windows systems in your environment using Windows Installer (virtually all Windows installations)
2. Prioritize patching for critical systems: domain controllers, financial systems, healthcare infrastructure, SCADA/ICS systems
3. Apply Microsoft security updates KB5005565 (Windows 10/11) or equivalent patches for your Windows version immediately
4. Verify patch installation using 'Get-HotFix' PowerShell command or Windows Update history
COMPENSATING CONTROLS (if immediate patching delayed):
5. Restrict Windows Installer execution via Group Policy: disable 'Allow user installs' and 'Always install with elevated privileges'
6. Implement AppLocker rules to restrict msiexec.exe execution
7. Monitor Windows Installer activity (Event ID 1033, 1034) for suspicious installations
8. Enforce principle of least privilege - remove unnecessary admin rights from user accounts
9. Enable Windows Defender/antivirus real-time protection
DETECTION:
10. Monitor for msiexec.exe execution with unusual parent processes or command-line arguments
11. Alert on Windows Installer service (msiserver) unexpected restarts
12. Track privilege escalation attempts in Security Event Log (Event ID 4688, 4672)
13. Deploy YARA rules targeting known CVE-2021-41379 exploit patterns
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أنظمة Windows في بيئتك التي تستخدم Windows Installer (تقريباً جميع تثبيتات Windows)
2. إعطاء الأولوية لتصحيح الأنظمة الحرجة: متحكمات المجال، الأنظمة المالية، البنية التحتية للرعاية الصحية، أنظمة SCADA/ICS
3. تطبيق تحديثات أمان Microsoft KB5005565 (Windows 10/11) أو التصحيحات المكافئة لإصدار Windows الخاص بك فوراً
4. التحقق من تثبيت التصحيح باستخدام أمر PowerShell 'Get-HotFix' أو سجل Windows Update
الضوابط البديلة (إذا تأخر التصحيح الفوري):
5. تقييد تنفيذ Windows Installer عبر Group Policy: تعطيل 'السماح بتثبيتات المستخدم' و'التثبيت دائماً بامتيازات مرتفعة'
6. تطبيق قواعد AppLocker لتقييد تنفيذ msiexec.exe
7. مراقبة نشاط Windows Installer (معرف الحدث 1033، 1034) للتثبيتات المريبة
8. فرض مبدأ أقل امتياز - إزالة حقوق المسؤول غير الضرورية من حسابات المستخدمين
9. تفعيل حماية Windows Defender/antivirus في الوقت الفعلي
الكشف:
10. مراقبة تنفيذ msiexec.exe مع العمليات الأب غير المعتادة أو وسائط سطر الأوامر
11. التنبيه على إعادة تشغيل خدمة Windows Installer (msiserver) غير المتوقعة
12. تتبع محاولات تصعيد الامتيازات في سجل أمان Windows (معرف الحدث 4688، 4672)
13. نشر قواعل YARA التي تستهدف أنماط استغلال CVE-2021-41379 المعروفة
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.5.1.1 - Access Control Policy
ECC 2024 A.5.2.1 - User Registration and De-registration
ECC 2024 A.5.3.1 - Access Rights Review
ECC 2024 A.8.2.1 - User Endpoint Devices
ECC 2024 A.12.2.1 - Restrictions on Software Installation
🔵 SAMA CSF
SAMA CSF ID.AM-2 - Software Inventory
SAMA CSF PR.AC-1 - Access Control Policy
SAMA CSF PR.AC-4 - Access Rights Management
SAMA CSF DE.CM-1 - System Monitoring
SAMA CSF RS.MI-1 - Incident Response Procedures
🟡 ISO 27001:2022
ISO 27001:2022 A.5.15 - Access Control
ISO 27001:2022 A.8.1 - User Endpoint Devices
ISO 27001:2022 A.8.2 - Privileged Access Rights
ISO 27001:2022 A.12.2 - Restrictions on Software Installation
ISO 27001:2022 A.12.6 - Management of Technical Vulnerabilities
🟣 PCI DSS v4.0
PCI DSS 2.2.4 - Configure System Security Parameters
PCI DSS 6.2 - Ensure Security Patches Installed
PCI DSS 7.1 - Limit Access to System Components
PCI DSS 10.2 - Implement Automated Audit Trails
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
Microsoft:Windows