📄 Description (English)
An attacker may exploit the use of outdated and weak MAC algorithms in the device’s SSH service to potentially compromise the integrity of the SSH session, allowing manipulation of transmitted data if the attacker can interact with the network traffic.
🤖 AI Executive Summary
CVE-2026-1627 involves weak MAC (Message Authentication Code) algorithms in SSH services that could allow attackers to compromise session integrity and manipulate transmitted data. With a CVSS score of 6.5 and no available patch, this vulnerability poses a medium-term risk to organizations relying on SSH for secure remote access and administrative functions. The lack of exploit availability provides a temporary window for mitigation through configuration hardening.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: May 11, 2026 16:33
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability significantly impacts Saudi organizations heavily dependent on SSH for administrative access: Banking sector (SAMA-regulated institutions) managing critical financial infrastructure, Government agencies (NCA oversight) requiring secure remote administration, Energy sector (ARAMCO and subsidiaries) controlling SCADA/ICS systems, Telecom providers (STC, Mobily) managing network infrastructure, and Healthcare organizations (MOH) accessing patient systems remotely. The integrity compromise could lead to unauthorized data manipulation, regulatory violations under SAMA CSF and NCA ECC 2024, and operational disruption in critical infrastructure.
🏢 Affected Saudi Sectors
Banking and Financial Services
Government and Public Administration
Energy and Utilities
Telecommunications
Healthcare
Critical Infrastructure
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
6.8
/ 10.0
🔧 Remediation Steps (English)
Immediate Actions:
1. Audit all SSH configurations across infrastructure to identify enabled weak MAC algorithms (MD5, SHA1, etc.)
2. Disable weak MAC algorithms immediately: Configure SSH to use only strong algorithms (HMAC-SHA2-256, HMAC-SHA2-512)
3. Implement network segmentation to restrict SSH access to trusted administrative networks only
4. Enable SSH logging and monitoring for all connection attempts and MAC algorithm negotiations
Configuration Hardening (No Patch Available):
5. Update sshd_config with: MACs hmac-sha2-256,hmac-sha2-512,umac-128@openssh.com
6. Disable legacy SSH protocol versions (SSH v1) if not already disabled
7. Implement certificate-based authentication instead of password-based SSH
8. Deploy SSH key management solutions with regular key rotation
Detection Rules:
9. Monitor for SSH connections negotiating weak MAC algorithms using: grep 'MAC' /var/log/auth.log
10. Alert on any SSH session establishment with deprecated algorithms
11. Implement IDS/IPS rules to detect SSH protocol anomalies
12. Regular vulnerability scanning of SSH service configurations
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تدقيق جميع إعدادات SSH عبر البنية التحتية لتحديد خوارزميات MAC الضعيفة المفعلة (MD5، SHA1، إلخ)
2. تعطيل خوارزميات MAC الضعيفة فوراً: تكوين SSH لاستخدام خوارزميات قوية فقط (HMAC-SHA2-256، HMAC-SHA2-512)
3. تطبيق تقسيم الشبكة لتقييد وصول SSH إلى شبكات إدارية موثوقة فقط
4. تفعيل تسجيل SSH والمراقبة لجميع محاولات الاتصال ومفاوضات خوارزمية MAC
تقسية الإعدادات (بدون تصحيح متاح):
5. تحديث sshd_config باستخدام: MACs hmac-sha2-256,hmac-sha2-512,umac-128@openssh.com
6. تعطيل إصدارات بروتوكول SSH القديمة (SSH v1) إن لم تكن معطلة بالفعل
7. تطبيق المصادقة القائمة على الشهادات بدلاً من SSH القائم على كلمات المرور
8. نشر حلول إدارة مفاتيح SSH مع تدوير منتظم للمفاتيح
قواعد الكشف:
9. مراقبة اتصالات SSH التي تفاوض خوارزميات MAC ضعيفة باستخدام: grep 'MAC' /var/log/auth.log
10. تنبيه عند إنشاء أي جلسة SSH باستخدام خوارزميات قديمة
11. تطبيق قواعد IDS/IPS للكشف عن شذوذ بروتوكول SSH
12. فحص دوري لثغرات إعدادات خدمة SSH
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.10.1.1 - Cryptographic controls and algorithm strength
ECC 2024 A.12.4.1 - Event logging and monitoring
ECC 2024 A.13.1.1 - Network security perimeter controls
🔵 SAMA CSF
SAMA CSF ID.BE-1 - Asset management and inventory
SAMA CSF PR.AC-1 - Access control and authentication
SAMA CSF DE.CM-1 - Detection and monitoring
SAMA CSF RS.MI-2 - Incident response and mitigation
🟡 ISO 27001:2022
ISO 27001:2022 A.5.15 - Cryptography
ISO 27001:2022 A.8.3 - Access control
ISO 27001:2022 A.8.22 - Monitoring
ISO 27001:2022 A.12.4.1 - Event logging
🟣 PCI DSS v4.0.1
PCI DSS 2.1 - Configuration standards
PCI DSS 4.1 - Encryption of data in transit
PCI DSS 10.2 - Logging and monitoring
🔗 References & Sources 6
🔗
🔗
🔗
🔗
🔗
🔗
https://sick.com/psirt
psirt@sick.de
https://www.cisa.gov/resources-tools/resources/ics-recommended-practices
psirt@sick.de
https://www.first.org/cvss/calculator/3.1
psirt@sick.de
https://www.sick.com/.well-known/csaf/white/2026/sca-2026-0005.json
psirt@sick.de
https://www.sick.com/.well-known/csaf/white/2026/sca-2026-0005.pdf
psirt@sick.de
https://www.sick.com/media/docs/9/19/719/special_information_sick_operating_guidelines_...
psirt@sick.de