📄 Description (English)
Synacor Zimbra Collaboration Suite (ZCS) Command Injection Vulnerability — Synacor Zimbra Collaboration Suite (ZCS) allows an attacker to inject memcache commands into a targeted instance which causes an overwrite of arbitrary cached entries.
🤖 AI Executive Summary
CVE-2022-27924 is a critical command injection vulnerability in Synacor Zimbra Collaboration Suite that allows attackers to inject memcache commands and overwrite arbitrary cached entries. With a CVSS score of 9.0 and publicly available exploits, this vulnerability poses an immediate threat to organizations using ZCS for email and collaboration services. Successful exploitation could lead to authentication bypass, session hijacking, and unauthorized access to sensitive communications.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 21, 2026 21:48
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability critically impacts Saudi government entities, banking sector (SAMA-regulated institutions), healthcare organizations, and large enterprises relying on Zimbra for email infrastructure. Government agencies using ZCS face risks of unauthorized access to classified communications. Saudi banks and financial institutions could experience session hijacking and credential theft. Telecommunications providers (STC, Mobily) and energy sector organizations (ARAMCO) using Zimbra are at high risk of data exfiltration and operational disruption. The vulnerability's ability to manipulate cached authentication tokens makes it particularly dangerous for organizations handling sensitive financial and governmental data.
🏢 Affected Saudi Sectors
Government and Public Administration
Banking and Financial Services
Healthcare and Medical Institutions
Energy and Utilities (ARAMCO)
Telecommunications (STC, Mobily)
Education and Universities
Large Enterprises and Corporations
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Zimbra Collaboration Suite instances in your environment and document versions
2. Isolate affected ZCS servers from untrusted networks if patching cannot be completed immediately
3. Review memcache access logs for suspicious command injection patterns
4. Monitor for unauthorized session creation and authentication anomalies
PATCHING GUIDANCE:
1. Apply Synacor's security patches immediately (ZCS 8.8.15 Patch 31 or later, ZCS 9.0.0 Patch 24 or later)
2. Verify patch installation by checking version numbers post-deployment
3. Restart Zimbra services after patching: zmcontrol restart
COMPENSATING CONTROLS (if immediate patching unavailable):
1. Restrict memcache port access (default 11211) to localhost only
2. Implement network segmentation to limit ZCS server communication
3. Disable memcache if not required for operations
4. Implement strict input validation on all user-supplied data
DETECTION RULES:
1. Monitor for memcache commands in HTTP requests (set, get, delete, flush_all)
2. Alert on unusual memcache command patterns or high-frequency cache operations
3. Track authentication token modifications in cache logs
4. Monitor for session hijacking indicators (multiple simultaneous sessions from different IPs)
5. Implement IDS/IPS rules to detect memcache injection payloads
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. حدد جميع مثيلات Zimbra Collaboration Suite في بيئتك وتوثيق الإصدارات
2. عزل خوادم ZCS المتأثرة عن الشبكات غير الموثوقة إذا لم يكن يمكن إكمال التصحيح فوراً
3. راجع سجلات وصول memcache للبحث عن أنماط حقن الأوامر المريبة
4. راقب إنشاء الجلسات غير المصرح بها والشذوذ في المصادقة
إرشادات التصحيح:
1. طبق تصحيحات الأمان من Synacor فوراً (ZCS 8.8.15 Patch 31 أو أحدث، ZCS 9.0.0 Patch 24 أو أحدث)
2. تحقق من تثبيت التصحيح بفحص أرقام الإصدار بعد النشر
3. أعد تشغيل خدمات Zimbra بعد التصحيح: zmcontrol restart
الضوابط البديلة (إذا لم يكن التصحيح الفوري متاحاً):
1. قيد وصول منفذ memcache (الافتراضي 11211) إلى localhost فقط
2. طبق تقسيم الشبكة لتحديد اتصالات خادم ZCS
3. عطل memcache إذا لم يكن مطلوباً للعمليات
4. طبق التحقق الصارم من المدخلات على جميع البيانات المقدمة من المستخدم
قواعد الكشف:
1. راقب أوامر memcache في طلبات HTTP (set, get, delete, flush_all)
2. أصدر تنبيهات عند أنماط أوامر memcache غير العادية أو العمليات عالية التكرار
3. تتبع تعديلات رموز المصادقة في سجلات ذاكرة التخزين المؤقت
4. راقب مؤشرات اختطاف الجلسات (جلسات متعددة متزامنة من عناوين IP مختلفة)
5. طبق قواعس IDS/IPS للكشف عن حمولات حقن memcache
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.5.1.1 - Access Control Policies
ECC 2024 A.5.2.1 - User Registration and Access Rights Management
ECC 2024 A.5.3.1 - Management of Privileged Access Rights
ECC 2024 A.6.1.1 - Information Security Policies and Procedures
ECC 2024 A.8.2.1 - User Access Management
ECC 2024 A.12.2.1 - Restrictions on Software Installation
ECC 2024 A.12.6.1 - Management of Technical Vulnerabilities
🔵 SAMA CSF
SAMA CSF ID.AM-2 - Software Inventory
SAMA CSF PR.AC-1 - Identity and Access Management
SAMA CSF PR.AC-4 - Access Rights Management
SAMA CSF DE.CM-8 - Vulnerability Scanning
SAMA CSF RS.MI-2 - Incident Response and Recovery
🟡 ISO 27001:2022
ISO 27001:2022 A.5.1 - Policies for Information Security
ISO 27001:2022 A.5.2 - Information Security Roles and Responsibilities
ISO 27001:2022 A.5.3 - Segregation of Duties
ISO 27001:2022 A.6.1 - Screening
ISO 27001:2022 A.8.1 - User Endpoint Devices
ISO 27001:2022 A.8.2 - Privileged Access Rights
ISO 27001:2022 A.8.3 - Information Access Restriction
ISO 27001:2022 A.12.2 - Software Installation
ISO 27001:2022 A.12.6 - Management of Technical Vulnerabilities
🟣 PCI DSS v4.0
PCI DSS 6.2 - Security Patches and Updates
PCI DSS 6.5.1 - Injection Flaws
PCI DSS 8.1 - User Identification and Authentication
PCI DSS 10.2 - Implement Automated Audit Trails
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
Synacor:Zimbra Collaboration Suite (ZCS)