📄 Description (English)
Microsoft Excel Security Feature Bypass — A security feature bypass vulnerability in Microsoft Excel would allow a local user to perform arbitrary code execution.
🤖 AI Executive Summary
CVE-2021-42292 is a critical security feature bypass vulnerability in Microsoft Excel (CVSS 9.0) that allows local users to execute arbitrary code by circumventing Excel's security mechanisms. This vulnerability poses severe risk to Saudi organizations as Excel is ubiquitously used across government, banking, and corporate sectors. Exploitation requires local access but can lead to complete system compromise, making immediate patching essential across all Microsoft Office deployments.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 21, 2026 11:18
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability critically impacts Saudi Arabia's banking sector (SAMA-regulated institutions), government agencies (NCA oversight), and large enterprises heavily reliant on Excel for financial modeling, reporting, and data analysis. ARAMCO, STC, and other critical infrastructure operators face elevated risk. The vulnerability enables privilege escalation and lateral movement within corporate networks, potentially compromising sensitive financial data, strategic documents, and operational systems. Healthcare institutions using Excel for patient data management are also at significant risk.
🏢 Affected Saudi Sectors
Banking and Financial Services
Government and Public Administration
Energy and Utilities
Healthcare
Telecommunications
Manufacturing
Education
Retail and E-commerce
🎯 MITRE ATT&CK Techniques
T1203 - Exploitation for Client Execution
T1559.002 - Inter-Process Communication: Dynamic Data Exchange
T1566.001 - Phishing: Spearphishing Attachment
T1204.002 - User Execution: Malicious File
T1547.001 - Boot or Logon Autostart Execution: Registry Run Keys
T1053.005 - Scheduled Task/Job: Scheduled Task
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Inventory all Microsoft Office installations across the organization, prioritizing systems with local user access
2. Restrict local user access to Excel files from untrusted sources
3. Disable Excel macros in security settings (Trust Center > Macro Settings > Disable All Macros)
4. Implement application whitelisting to prevent unauthorized code execution
PATCHING GUIDANCE:
1. Apply Microsoft security updates for Office 2016, Office 2019, and Microsoft 365 immediately
2. Prioritize patching for systems handling sensitive financial or government data
3. Test patches in non-production environments before enterprise deployment
4. Verify patch installation using Windows Update or WSUS
COMPENSATING CONTROLS (if patching delayed):
1. Implement file integrity monitoring on Excel files
2. Use Data Execution Prevention (DEP) and Address Space Layout Randomization (ASLR)
3. Monitor for suspicious Excel process behavior using EDR solutions
4. Restrict Excel execution via AppLocker policies
DETECTION RULES:
1. Monitor for Excel.exe spawning child processes (cmd.exe, powershell.exe)
2. Alert on Excel loading unsigned DLLs or executing from temp directories
3. Track modifications to Excel security registry keys
4. Monitor for unusual file access patterns from Excel processes
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. حصر جميع تثبيتات Microsoft Office في المنظمة مع إعطاء الأولوية للأنظمة التي يمكن للمستخدمين المحليين الوصول إليها
2. تقييد وصول المستخدمين المحليين إلى ملفات Excel من مصادر غير موثوقة
3. تعطيل وحدات الماكرو في Excel من خلال إعدادات الأمان (Trust Center > Macro Settings > Disable All Macros)
4. تطبيق قائمة بيضاء للتطبيقات لمنع تنفيذ الأكواد غير المصرح بها
إرشادات التصحيح:
1. تطبيق تحديثات أمان Microsoft لـ Office 2016 و Office 2019 و Microsoft 365 فوراً
2. إعطاء الأولوية لتصحيح الأنظمة التي تتعامل مع البيانات المالية أو الحكومية الحساسة
3. اختبار التصحيحات في بيئات غير الإنتاج قبل النشر على مستوى المؤسسة
4. التحقق من تثبيت التصحيح باستخدام Windows Update أو WSUS
الضوابط البديلة (إذا تأخر التصحيح):
1. تطبيق مراقبة سلامة الملفات على ملفات Excel
2. استخدام Data Execution Prevention (DEP) و Address Space Layout Randomization (ASLR)
3. مراقبة سلوك عملية Excel المريب باستخدام حلول EDR
4. تقييد تنفيذ Excel عبر سياسات AppLocker
قواعد الكشف:
1. مراقبة Excel.exe لإنشاء عمليات فرعية (cmd.exe, powershell.exe)
2. تنبيهات عند تحميل Excel لمكتبات DLL غير موقعة أو التنفيذ من مجلدات مؤقتة
3. تتبع التعديلات على مفاتيح سجل أمان Excel
4. مراقبة أنماط الوصول إلى الملفات غير العادية من عمليات Excel
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.5.1.1 - Information security policies and procedures
A.8.1.1 - User access management
A.12.2.1 - Change management procedures
A.12.6.1 - Management of technical vulnerabilities
🔵 SAMA CSF
ID.RA-1 - Asset management and vulnerability identification
PR.IP-12 - Software, firmware, and information integrity mechanisms
DE.CM-8 - Vulnerability scans are performed
🟡 ISO 27001:2022
A.12.6.1 - Management of technical vulnerabilities
A.14.2.1 - Secure development policy
A.12.2.1 - Change management
🟣 PCI DSS v4.0
6.2 - Ensure all system components are protected from known vulnerabilities
6.1 - Establish a process to identify and assign a risk rating to newly discovered security vulnerabilities
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
Microsoft:Office