📄 Description (English)
SumatraPDF is a multi-format reader for Windows. In 3.5.0 through 3.5.2, SumatraPDF's update mechanism disables TLS hostname verification (INTERNET_FLAG_IGNORE_CERT_CN_INVALID) and executes installers without signature checks. A network attacker with any valid TLS certificate (e.g., Let's Encrypt) can intercept the update check request, inject a malicious installer URL, and achieve arbitrary code execution.
🤖 AI Executive Summary
SumatraPDF versions 3.5.0-3.5.2 contain a critical vulnerability in their update mechanism that disables TLS hostname verification and executes installers without signature validation. An attacker with any valid TLS certificate can intercept update requests and inject malicious installers, leading to arbitrary code execution. This vulnerability is actively exploitable and patches are available.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: May 4, 2026 12:48
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses significant risk to Saudi organizations across multiple sectors. Government entities and NCA-regulated organizations using SumatraPDF for document processing face direct compromise risk. Banking and financial institutions (SAMA-regulated) using this PDF reader for document review could experience unauthorized access to sensitive financial documents. Healthcare organizations processing patient records, energy sector (ARAMCO and subsidiaries) handling technical documentation, and telecommunications companies (STC, Mobily) managing operational documents are all at risk. The vulnerability enables complete system compromise through automatic update mechanisms, making it particularly dangerous in enterprise environments.
🏢 Affected Saudi Sectors
Government
Banking and Financial Services
Healthcare
Energy and Utilities
Telecommunications
Education
Legal Services
🎯 MITRE ATT&CK Techniques
T1195.002 - Supply Chain Compromise: Compromise Software Supply Chain
T1566.002 - Phishing: Spearphishing Link
T1071.001 - Application Layer Protocol: Web Protocols
T1036.005 - Masquerading: Match Legitimate Name or Location
T1547.001 - Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder
T1059.003 - Command and Scripting Interpreter: Windows Command Shell
⚖️ Saudi Risk Score (AI)
8.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all systems running SumatraPDF versions 3.5.0-3.5.2 using asset inventory tools
2. Disable automatic updates in SumatraPDF settings immediately
3. Restrict network access to SumatraPDF update servers (*.sumatrapdfreader.org) at firewall level
4. Monitor for suspicious installer downloads or execution attempts
PATCHING:
1. Upgrade to SumatraPDF 3.5.3 or later immediately
2. Verify installer signatures before execution
3. Deploy patches through centralized patch management systems
4. Test patches in non-production environment first
COMPENSATING CONTROLS (if immediate patching not possible):
1. Implement application whitelisting to prevent unauthorized installer execution
2. Deploy network segmentation to isolate systems running vulnerable versions
3. Enable DNS filtering to block update server domains
4. Implement SSL/TLS inspection at network boundary to detect certificate anomalies
DETECTION:
1. Monitor for outbound connections to SumatraPDF update servers with invalid certificates
2. Alert on execution of SumatraPDF installers from unexpected locations
3. Track process creation events from SumatraPDF processes
4. Monitor Windows registry for SumatraPDF update configuration changes
5. Implement YARA rule: detect unsigned PE files downloaded by SumatraPDF process
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع الأنظمة التي تقوم بتشغيل إصدارات SumatraPDF 3.5.0-3.5.2 باستخدام أدوات جرد الأصول
2. تعطيل التحديثات التلقائية في إعدادات SumatraPDF فوراً
3. تقييد الوصول إلى خوادم تحديث SumatraPDF على مستوى جدار الحماية
4. مراقبة محاولات التنزيل أو التنفيذ المريبة للمثبتات
التصحيح:
1. الترقية إلى SumatraPDF 3.5.3 أو إصدار أحدث فوراً
2. التحقق من توقيعات المثبت قبل التنفيذ
3. نشر التصحيحات من خلال أنظمة إدارة التصحيحات المركزية
4. اختبار التصحيحات في بيئة غير الإنتاج أولاً
الضوابط البديلة (إذا لم يكن التصحيح الفوري ممكناً):
1. تنفيذ قائمة بيضاء للتطبيقات لمنع تنفيذ المثبتات غير المصرح بها
2. نشر تقسيم الشبكة لعزل الأنظمة التي تقوم بتشغيل الإصدارات الضعيفة
3. تفعيل تصفية DNS لحظر نطاقات خادم التحديث
4. تنفيذ فحص SSL/TLS على حدود الشبكة للكشف عن شذوذ الشهادات
الكشف:
1. مراقبة الاتصالات الصادرة إلى خوادم تحديث SumatraPDF بشهادات غير صحيحة
2. تنبيه عند تنفيذ مثبتات SumatraPDF من مواقع غير متوقعة
3. تتبع أحداث إنشاء العمليات من عمليات SumatraPDF
4. مراقبة سجل Windows للتغييرات في إعدادات تحديث SumatraPDF
5. تنفيذ قاعدة YARA: الكشف عن ملفات PE غير الموقعة التي تم تنزيلها بواسطة عملية SumatraPDF
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.14.2.1 - Information security requirements for supplier relationships
ECC 2024 A.14.2.5 - Restrictions on the use of information and assets of suppliers
ECC 2024 A.12.6.1 - Management of technical vulnerabilities
ECC 2024 A.12.2.1 - Configuration management
🔵 SAMA CSF
ID.SC-4 - Supplier and partner risks are managed
PR.IP-12 - A vulnerability management plan is developed and implemented
DE.CM-8 - Vulnerability scans are performed
RS.MI-2 - Incidents are mitigated
🟡 ISO 27001:2022
A.12.6.1 - Management of technical vulnerabilities
A.12.2.1 - Configuration management
A.14.2.1 - Information security requirements for supplier relationships
A.8.1.1 - User endpoint devices
🟣 PCI DSS v4.0.1
Requirement 6.2 - Ensure security patches are installed within one month of release
Requirement 6.5.10 - Broken cryptography
Requirement 11.2 - Run automated vulnerability scanning tools
📦 Affected Products / CPE 1 entries
sumatrapdfreader:sumatrapdf