📄 Description (English)
Synacor Zimbra Collaboration Suite (ZCS) Arbitrary File Upload Vulnerability — Synacor Zimbra Collaboration Suite (ZCS) contains flaw in the mboximport functionality, allowing an authenticated attacker to upload arbitrary files to perform remote code execution. This vulnerability was chained with CVE-2022-37042 which allows for unauthenticated remote code execution.
🤖 AI Executive Summary
CVE-2022-27925 is a critical arbitrary file upload vulnerability in Synacor Zimbra Collaboration Suite affecting the mboximport functionality. An authenticated attacker can upload malicious files to achieve remote code execution. When chained with CVE-2022-37042, this enables unauthenticated RCE, making it a severe threat to email infrastructure. Immediate patching is essential as exploits are publicly available.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 21, 2026 21:44
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses critical risk to Saudi organizations heavily dependent on Zimbra for email infrastructure. Most affected sectors include: Banking (SAMA-regulated institutions using Zimbra for internal communications), Government agencies (NCA oversight), Healthcare (SEHA and private hospitals), Telecommunications (STC, Mobily, Zain), and Energy sector (ARAMCO and subsidiaries). The ability to chain with CVE-2022-37042 for unauthenticated RCE makes this particularly dangerous for perimeter-facing Zimbra deployments. Compromise could lead to data exfiltration, business email compromise, and lateral movement into critical systems.
🏢 Affected Saudi Sectors
Banking and Financial Services
Government and Public Administration
Healthcare and Hospitals
Energy and Utilities
Telecommunications
Education
Large Enterprises
🎯 MITRE ATT&CK Techniques
T1190 - Exploit Public-Facing Application
T1434 - Internal Spearphishing
T1566 - Phishing
T1598 - Phishing for Information
T1199 - Trusted Relationship
T1570 - Lateral Tool Transfer
T1059 - Command and Scripting Interpreter
T1053 - Scheduled Task/Job
T1041 - Exfiltration Over C2 Channel
T1020 - Automated Exfiltration
⚖️ 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 or restrict network access to Zimbra servers pending patching
3. Review mailbox import logs for suspicious activity and unauthorized file uploads
4. Monitor for indicators of compromise (unexpected processes, outbound connections from Zimbra servers)
PATCHING GUIDANCE:
1. Apply Synacor security patches immediately (ZCS 8.8.15 Patch 31 or later, ZCS 9.0.0 Patch 24 or later)
2. Prioritize internet-facing Zimbra instances
3. Test patches in non-production environment first
4. Plan maintenance window with minimal business impact
COMPENSATING CONTROLS (if patching delayed):
1. Restrict mboximport functionality to trusted administrators only
2. Implement network segmentation to limit Zimbra server access
3. Disable or restrict file upload capabilities if not required
4. Implement strict input validation on import functions
5. Enable detailed audit logging for all import operations
DETECTION RULES:
1. Monitor for POST requests to /service/import endpoints with suspicious file types
2. Alert on execution of unexpected processes spawned by Zimbra services
3. Track failed authentication attempts followed by successful imports
4. Monitor for unusual outbound connections from Zimbra servers
5. Review audit logs for mboximport operations with non-standard parameters
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع مثيلات Zimbra Collaboration Suite في بيئتك وتوثيق الإصدارات
2. عزل أو تقييد الوصول إلى شبكة خوادم Zimbra في انتظار التصحيح
3. مراجعة سجلات استيراد صناديق البريد للنشاط المريب وتحميلات الملفات غير المصرح بها
4. مراقبة مؤشرات الاختراق (العمليات غير المتوقعة والاتصالات الصادرة من خوادم Zimbra)
إرشادات التصحيح:
1. تطبيق تصحيحات أمان Synacor على الفور (ZCS 8.8.15 Patch 31 أو أحدث، ZCS 9.0.0 Patch 24 أو أحدث)
2. إعطاء الأولوية لمثيلات Zimbra المواجهة للإنترنت
3. اختبار التصحيحات في بيئة غير الإنتاج أولاً
4. التخطيط لنافذة صيانة بأقل تأثير على الأعمال
الضوابط البديلة (إذا تأخر التصحيح):
1. تقييد وظيفة mboximport للمسؤولين الموثوقين فقط
2. تنفيذ تقسيم الشبكة لتحديد الوصول إلى خادم Zimbra
3. تعطيل أو تقييد قدرات تحميل الملفات إذا لم تكن مطلوبة
4. تنفيذ التحقق الصارم من المدخلات على وظائف الاستيراد
5. تفعيل تسجيل التدقيق التفصيلي لجميع عمليات الاستيراد
قواعد الكشف:
1. مراقبة طلبات POST إلى نقاط نهاية /service/import بأنواع ملفات مريبة
2. التنبيه على تنفيذ العمليات غير المتوقعة التي تم إطلاقها بواسطة خدمات Zimbra
3. تتبع محاولات المصادقة الفاشلة متبوعة باستيرادات ناجحة
4. مراقبة الاتصالات الصادرة غير العادية من خوادم Zimbra
5. مراجعة سجلات التدقيق لعمليات mboximport بمعاملات غير قياسية
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.5.1.1 - Information Security Policies and Procedures
A.6.1.1 - Organization of Information Security
A.8.1.1 - User Access Management
A.12.2.1 - Restrictions on Software Installation
A.12.4.1 - Event Logging
A.12.6.1 - Management of Technical Vulnerabilities
🔵 SAMA CSF
ID.RA-1 - Asset Management and Vulnerability Management
PR.IP-12 - Software, Firmware, and Information Updates
DE.CM-3 - Personnel Activity Monitoring
DE.AE-1 - Anomalies and Events Detection
RS.MI-1 - Incident Response and Recovery
🟡 ISO 27001:2022
A.6.1.1 - Screening and Selection
A.8.1.4 - Access Rights Review
A.12.2.1 - Restrictions on Software Installation
A.12.6.1 - Management of Technical Vulnerabilities
A.12.6.2 - Timely Installation of Technical Security Updates
A.14.2.1 - Secure Development Policy
🟣 PCI DSS v4.0
Requirement 2.2.4 - Configure System Security Parameters
Requirement 6.2 - Ensure Security Patches Installed
Requirement 10.2 - Implement Automated Audit Trails
Requirement 11.2 - Vulnerability Scanning
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
Synacor:Zimbra Collaboration Suite (ZCS)