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Vulnerabilities

CVE-2023-2868

Critical 🇺🇸 CISA KEV ⚡ Exploit Available
Barracuda Networks ESG Appliance Improper Input Validation Vulnerability — Barracuda Email Security Gateway (ESG) appliance contains an improper input validation vulnerability of a user-supplied .tar
Published: May 26, 2023  ·  Source: CISA_KEV
CVSS v3
9.0
🔗 NVD Official
📄 Description (English)

Barracuda Networks ESG Appliance Improper Input Validation Vulnerability — Barracuda Email Security Gateway (ESG) appliance contains an improper input validation vulnerability of a user-supplied .tar file, leading to remote command injection.

🤖 AI Executive Summary

Barracuda Email Security Gateway (ESG) appliances contain a critical remote command injection vulnerability (CVSS 9.0) exploitable through malicious .tar file uploads. This vulnerability allows unauthenticated attackers to execute arbitrary commands with system privileges, posing an immediate threat to email infrastructure. Active exploits are publicly available, making this a high-priority threat requiring immediate patching across all affected deployments.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 19, 2026 07:16
🇸🇦 Saudi Arabia Impact Assessment
Critical impact on Saudi banking sector (SAMA-regulated institutions), government agencies (NCA oversight), and large enterprises relying on Barracuda ESG for email security. Saudi Aramco, STC, and other critical infrastructure operators using ESG appliances face direct risk of email system compromise, data exfiltration, and lateral network movement. Financial institutions processing SWIFT messages and government entities handling classified communications are particularly vulnerable. The vulnerability enables complete appliance takeover, potentially compromising email confidentiality and integrity across entire organizations.
🏢 Affected Saudi Sectors
Banking and Financial Services Government and Public Administration Energy and Utilities Telecommunications Healthcare Large Enterprises Critical Infrastructure
⚖️ Saudi Risk Score (AI)
9.5
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Barracuda ESG appliances in your environment and document firmware versions
2. Isolate affected ESG appliances from untrusted networks if patching cannot be completed immediately
3. Review email logs for suspicious .tar file uploads or unusual command execution patterns
4. Monitor for indicators of compromise: unexpected system processes, unauthorized user accounts, suspicious network connections

PATCHING GUIDANCE:
1. Apply Barracuda's latest security patches immediately (prioritize over other updates)
2. Test patches in non-production environment first
3. Schedule maintenance windows for production appliance updates
4. Verify patch installation by checking firmware version post-update

COMPENSATING CONTROLS (if immediate patching not possible):
1. Implement strict input validation on .tar file uploads at network perimeter
2. Disable .tar file upload functionality if not operationally required
3. Restrict ESG appliance access to trusted networks only
4. Implement network segmentation to limit lateral movement from compromised ESG
5. Enable comprehensive audit logging on ESG appliances

DETECTION RULES:
1. Monitor for HTTP POST requests containing .tar files to ESG management interfaces
2. Alert on unexpected process execution from ESG system processes
3. Track failed and successful authentication attempts to ESG
4. Monitor for outbound connections from ESG to external IP addresses
5. Alert on modifications to ESG system files or configuration
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. حدد جميع أجهزة Barracuda ESG في بيئتك وقم بتوثيق إصدارات البرامج الثابتة
2. عزل أجهزة ESG المتأثرة عن الشبكات غير الموثوقة إذا لم يكن التصحيح ممكناً فوراً
3. راجع سجلات البريد الإلكتروني للتحقق من تحميلات ملفات .tar المريبة أو أنماط تنفيذ الأوامر غير المعتادة
4. راقب مؤشرات الاختراق: العمليات غير المتوقعة، حسابات المستخدمين غير المصرح بها، الاتصالات الشبكية المريبة

إرشادات التصحيح:
1. طبق أحدث تصحيحات الأمان من Barracuda فوراً (أعطها الأولوية على التحديثات الأخرى)
2. اختبر التصحيحات في بيئة غير الإنتاج أولاً
3. جدول نوافذ الصيانة لتحديثات الأجهزة الإنتاجية
4. تحقق من تثبيت التصحيح بفحص إصدار البرنامج الثابت بعد التحديث

الضوابط البديلة (إذا لم يكن التصحيح الفوري ممكناً):
1. تطبيق التحقق الصارم من صحة الإدخال على تحميلات ملفات .tar على محيط الشبكة
2. تعطيل وظيفة تحميل ملفات .tar إذا لم تكن مطلوبة تشغيلياً
3. تقييد الوصول إلى جهاز ESG للشبكات الموثوقة فقط
4. تطبيق تقسيم الشبكة لتحديد الحركة الجانبية من ESG المخترقة
5. تفعيل تسجيل التدقيق الشامل على أجهزة ESG

قواعد الكشف:
1. راقب طلبات HTTP POST التي تحتوي على ملفات .tar إلى واجهات إدارة ESG
2. تنبيه عند تنفيذ العمليات غير المتوقعة من عمليات نظام ESG
3. تتبع محاولات المصادقة الفاشلة والناجحة على ESG
4. راقب الاتصالات الصادرة من ESG إلى عناوين IP خارجية
5. تنبيه عند تعديل ملفات نظام ESG أو الإعدادات
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.5.1.1 - Information Security Policies and Procedures ECC 2024 A.6.1.2 - Access Control and Authentication ECC 2024 A.8.2.1 - System Hardening and Patch Management ECC 2024 A.8.3.1 - Malware Protection and Detection ECC 2024 A.9.1.1 - Incident Detection and Response
🔵 SAMA CSF
SAMA CSF Governance - Risk Management Framework SAMA CSF Protect - Access Control and Authentication SAMA CSF Protect - System and Communications Protection SAMA CSF Detect - Security Monitoring and Incident Detection SAMA CSF Respond - Incident Response and Recovery
🟡 ISO 27001:2022
ISO 27001:2022 A.5.1 - Policies for Information Security ISO 27001:2022 A.6.1 - Organizational Controls ISO 27001:2022 A.8.1 - Asset Management ISO 27001:2022 A.8.2 - Data Protection ISO 27001:2022 A.8.6 - Cryptography ISO 27001:2022 A.12.6 - Technical Vulnerability Management
🟣 PCI DSS v4.0
PCI DSS 2.4 - Configuration Standards PCI DSS 6.2 - Security Patches and Updates PCI DSS 11.2 - Vulnerability Scanning PCI DSS 12.2 - Configuration Standards for System Components
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
Barracuda Networks:Email Security Gateway (ESG) Appliance
📊 CVSS Score
9.0
/ 10.0 — Critical
📋 Quick Facts
Severity Critical
CVSS Score9.0
EPSS89.52%
Exploit ✓ Yes
Patch ✓ Yes
CISA KEV🇺🇸 Yes
KEV Due Date2023-06-16
Published 2023-05-26
Source Feed cisa_kev
Views 1
🇸🇦 Saudi Risk Score
9.5
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
kev actively-exploited
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