📄 Description (English)
A flaw was found in 389 Directory Server. The ldap_utf8prev() function reads bytes before the start of a buffer without bounds checking, causing a heap buffer over-read in string filter parsing that may influence internal filter processing behavior.
🤖 AI Executive Summary
CVE-2026-11787 is a heap buffer over-read vulnerability in 389 Directory Server's ldap_utf8prev() function affecting LDAP string filter parsing. While currently unpatched with no known exploits, this vulnerability could allow attackers to read sensitive data from memory or cause denial of service by manipulating LDAP filter inputs. Organizations using 389 Directory Server for authentication and directory services should implement immediate compensating controls.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Jun 9, 2026 18:34
🇸🇦 Saudi Arabia Impact Assessment
Saudi government agencies (NCA, GOSI), banking sector (SAMA-regulated institutions), and telecommunications providers (STC, Mobily) relying on 389 Directory Server for LDAP-based authentication and directory services face potential data exposure risks. The vulnerability could compromise user credentials, organizational directory information, and internal authentication mechanisms. Healthcare organizations using LDAP for access control are also at moderate risk.
🏢 Affected Saudi Sectors
Government (NCA, GOSI, Ministry of Interior)
Banking and Financial Services (SAMA-regulated)
Telecommunications (STC, Mobily, Zain)
Healthcare (MOH, private hospitals)
Energy (ARAMCO, SEC)
Education (Universities, ETEC)
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
6.2
/ 10.0
🔧 Remediation Steps (English)
Immediate Actions:
1. Inventory all 389 Directory Server instances across your infrastructure
2. Restrict LDAP filter input validation at the application layer to reject malformed UTF-8 sequences
3. Implement network segmentation to limit LDAP server exposure to trusted networks only
4. Enable comprehensive LDAP query logging and monitoring for suspicious filter patterns
Compensating Controls:
5. Deploy Web Application Firewall (WAF) rules to detect and block LDAP injection attempts
6. Implement input validation that sanitizes LDAP filter strings before processing
7. Monitor heap memory access patterns for anomalies using endpoint detection tools
8. Establish rate limiting on LDAP queries to prevent exploitation attempts
Detection Rules:
9. Alert on LDAP queries containing null bytes or invalid UTF-8 sequences
10. Monitor for repeated failed LDAP filter parsing attempts
11. Track memory access violations in 389 Directory Server processes
12. Watch for unusual LDAP filter complexity or length anomalies
Patching:
13. Subscribe to 389 Directory Server security advisories for patch availability
14. Prepare patch testing environment immediately upon patch release
15. Plan emergency patching window with change management approval
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. حصر جميع نسخ 389 Directory Server عبر البنية التحتية
2. تقييد التحقق من صحة مدخلات مرشح LDAP على مستوى التطبيق
3. تطبيق تقسيم الشبكة لتحديد تعريض خادم LDAP للشبكات الموثوقة فقط
4. تفعيل تسجيل ومراقبة استعلامات LDAP الشاملة
الضوابط التعويضية:
5. نشر قواعد جدار حماية تطبيقات الويب لكشف محاولات حقن LDAP
6. تطبيق التحقق من صحة المدخلات لتنظيف سلاسل مرشحات LDAP
7. مراقبة أنماط الوصول إلى ذاكرة الكومة للكشف عن الشذوذ
8. تحديد معدل استعلامات LDAP لمنع محاولات الاستغلال
قواعد الكشف:
9. تنبيهات على استعلامات LDAP تحتوي على بايتات فارغة أو تسلسلات UTF-8 غير صالحة
10. مراقبة محاولات فشل معالجة مرشح LDAP المتكررة
11. تتبع انتهاكات الوصول إلى الذاكرة في عمليات 389 Directory Server
12. مراقبة شذوذ تعقيد أو طول مرشح LDAP غير المعتاد
التصحيح:
13. الاشتراك في تنبيهات أمان 389 Directory Server
14. تحضير بيئة اختبار التصحيح فوراً عند توفره
15. التخطيط لنافذة تصحيح طارئة مع موافقة إدارة التغيير
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.5.1.1 - Access Control Policies
ECC 2024 A.8.2.1 - User Registration and De-registration
ECC 2024 A.8.2.3 - Management of Privileged Access Rights
ECC 2024 A.12.4.1 - Event Logging
ECC 2024 A.12.4.3 - Protection of Log Information
🔵 SAMA CSF
ID.AM-2 - Software Inventory
PR.AC-1 - Identity and Access Management
PR.AC-4 - Access Rights Management
DE.CM-1 - The network is monitored to detect potential cybersecurity events
DE.CM-3 - Personnel activity is monitored to detect potential cybersecurity events
🟡 ISO 27001:2022
A.5.1.1 - Policies for information security
A.8.1.1 - User registration and access provisioning
A.8.1.4 - Access rights review
A.12.4.1 - Event logging
A.12.4.3 - Protection of log information
🟣 PCI DSS v4.0.1
Requirement 2.1 - Configuration standards for system components
Requirement 6.2 - Security patches installation
Requirement 8.1 - User identification and authentication
Requirement 10.2 - Automated audit trails