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Vulnerabilities

CVE-2020-36193

Critical 🇺🇸 CISA KEV ⚡ Exploit Available
PEAR Archive_Tar Improper Link Resolution Vulnerability — PEAR Archive_Tar Tar.php allows write operations with directory traversal due to inadequate checking of symbolic links. PEAR stands for PHP Ex
Published: Aug 25, 2022  ·  Source: CISA_KEV
CVSS v3
9.0
🔗 NVD Official
📄 Description (English)

PEAR Archive_Tar Improper Link Resolution Vulnerability — PEAR Archive_Tar Tar.php allows write operations with directory traversal due to inadequate checking of symbolic links. PEAR stands for PHP Extension and Application Repository and it is an open-source framework and distribution system for reusable PHP components with known usage in third-party products such as Drupal Core and Red Hat Linux.

🤖 AI Executive Summary

CVE-2020-36193 is a critical directory traversal vulnerability in PEAR Archive_Tar that allows attackers to write files outside intended directories through improper symbolic link validation. With a CVSS score of 9.0 and publicly available exploits, this vulnerability poses severe risk to Saudi organizations using affected PHP applications, particularly those running Drupal-based systems. Immediate patching is essential as the vulnerability enables arbitrary file write operations that could lead to complete system compromise.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 19, 2026 11:50
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability critically impacts Saudi organizations across multiple sectors: (1) Government agencies and NCA-regulated entities using Drupal for web portals and content management; (2) Banking and SAMA-regulated financial institutions with PHP-based transaction processing systems; (3) Healthcare providers using Drupal for patient management systems; (4) Telecommunications operators (STC, Mobily) with web infrastructure; (5) Energy sector organizations including ARAMCO subsidiaries with web-facing applications. The vulnerability allows attackers to achieve remote code execution by writing malicious files to web-accessible directories, potentially compromising sensitive data, financial systems, and critical infrastructure.
🏢 Affected Saudi Sectors
Government Banking and Financial Services Healthcare Telecommunications Energy and Utilities Education E-commerce
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all systems running PEAR Archive_Tar, particularly Drupal installations and PHP applications
2. Disable file upload functionality if not critical until patching is complete
3. Implement strict file access controls and disable symbolic link following in web server configuration

PATCHING GUIDANCE:
1. Update PEAR Archive_Tar to version 1.4.14 or later
2. For Drupal installations, update to patched versions (Drupal 7.x and 8.x have security updates available)
3. Apply patches from Red Hat if using RHEL-based systems
4. Test patches in non-production environments before deployment

COMPENSATING CONTROLS (if immediate patching unavailable):
1. Disable symbolic link following: Set 'FollowSymLinks Off' in Apache .htaccess or nginx configuration
2. Implement strict input validation on all file upload operations
3. Restrict write permissions to specific directories outside web root
4. Use Web Application Firewall (WAF) rules to block directory traversal patterns (../, ..\ sequences)
5. Monitor file system for unauthorized file creation in sensitive directories

DETECTION RULES:
1. Monitor for tar/archive extraction operations with symbolic links
2. Alert on file write operations outside designated upload directories
3. Track creation of files in system directories (/etc, /var, /usr/bin) from web processes
4. Monitor for suspicious .tar, .tar.gz, .tgz file uploads containing symlink entries
5. Log and alert on PHP processes attempting to follow symbolic links during archive operations
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع الأنظمة التي تعمل بـ PEAR Archive_Tar، خاصة تثبيتات Drupal والتطبيقات المستندة إلى PHP
2. تعطيل وظيفة تحميل الملفات إذا لم تكن حرجة حتى يتم التصحيح
3. تنفيذ عناصر تحكم صارمة في الوصول إلى الملفات وتعطيل متابعة الروابط الرمزية في إعدادات خادم الويب

إرشادات التصحيح:
1. تحديث PEAR Archive_Tar إلى الإصدار 1.4.14 أو أحدث
2. لتثبيتات Drupal، قم بالتحديث إلى الإصدارات المصححة (Drupal 7.x و 8.x لديها تحديثات أمان متاحة)
3. تطبيق التصحيحات من Red Hat إذا كنت تستخدم أنظمة قائمة على RHEL
4. اختبر التصحيحات في بيئات غير الإنتاج قبل النشر

عناصر التحكم البديلة (إذا لم يكن التصحيح الفوري متاحاً):
1. تعطيل متابعة الروابط الرمزية: اضبط 'FollowSymLinks Off' في Apache .htaccess أو إعدادات nginx
2. تنفيذ التحقق الصارم من المدخلات على جميع عمليات تحميل الملفات
3. تقييد أذونات الكتابة على دلائل محددة خارج جذر الويب
4. استخدام قواعد جدار حماية تطبيقات الويب (WAF) لحظر أنماط المسار المتقاطع
5. مراقبة نظام الملفات للكشف عن إنشاء ملفات غير مصرح بها في الدلائل الحساسة

قواعد الكشف:
1. مراقبة عمليات استخراج tar/archive مع الروابط الرمزية
2. تنبيهات على عمليات كتابة الملفات خارج دلائل التحميل المخصصة
3. تتبع إنشاء الملفات في دلائل النظام من عمليات الويب
4. مراقبة وتنبيهات على تحميلات ملفات .tar المريبة التي تحتوي على إدخالات symlink
5. تسجيل وتنبيهات على عمليات PHP التي تحاول متابعة الروابط الرمزية أثناء عمليات الأرشيف
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.12.4.1 - Event logging and monitoring controls A.14.2.1 - Secure development policy and procedures A.14.2.5 - Secure development environment 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.14.2.5 - Secure development environment A.12.4.1 - Event logging
🟣 PCI DSS v4.0
6.2 - Ensure all system components and software are protected from known vulnerabilities 6.5.1 - Injection flaws prevention 11.2 - Vulnerability scanning
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
PEAR:Archive_Tar
📊 CVSS Score
9.0
/ 10.0 — Critical
📋 Quick Facts
Severity Critical
CVSS Score9.0
EPSS71.15%
Exploit ✓ Yes
Patch ✓ Yes
CISA KEV🇺🇸 Yes
KEV Due Date2022-09-15
Published 2022-08-25
Source Feed cisa_kev
Views 1
🇸🇦 Saudi Risk Score
9.2
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
kev actively-exploited
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