📄 Description (English)
Sudo Heap-Based Buffer Overflow Vulnerability — Sudo contains an off-by-one error that can result in a heap-based buffer overflow, which allows for privilege escalation.
🤖 AI Executive Summary
CVE-2021-3156 is a critical heap-based buffer overflow vulnerability in Sudo affecting versions before 1.9.5p2, allowing local attackers to escalate privileges to root. With a CVSS score of 9.0 and publicly available exploits, this poses an immediate threat to all Linux-based systems across Saudi organizations. Patching is urgent as the vulnerability requires only local access and can be exploited without user interaction.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 20, 2026 17:33
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses critical risk to Saudi government agencies (NCA, NCSC), SAMA-regulated financial institutions, healthcare providers (MOH), energy sector (Saudi Aramco, SEC), and telecommunications operators (STC, Mobily). Linux servers hosting critical infrastructure, databases, and administrative systems are at highest risk. The vulnerability enables privilege escalation from any local user account, potentially compromising entire systems and sensitive data including financial records, national security information, and critical infrastructure controls.
🏢 Affected Saudi Sectors
Government (NCA, NCSC, Ministry of Interior)
Banking & Finance (SAMA-regulated institutions)
Healthcare (Ministry of Health)
Energy (Saudi Aramco, SEC)
Telecommunications (STC, Mobily, Zain)
Education (Universities, Research Institutions)
Critical Infrastructure
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all systems running Sudo versions before 1.9.5p2 using: sudo --version
2. Restrict local access to systems with vulnerable Sudo versions until patching is complete
3. Monitor for exploitation attempts using process monitoring tools
PATCHING GUIDANCE:
1. Update Sudo to version 1.9.5p2 or later immediately
2. For RHEL/CentOS: yum update sudo
3. For Ubuntu/Debian: apt-get update && apt-get install sudo
4. For SLES: zypper update sudo
5. Verify patch installation: sudo --version (should show 1.9.5p2 or later)
COMPENSATING CONTROLS (if immediate patching not possible):
1. Restrict sudo access via /etc/sudoers to essential users only
2. Implement AppArmor or SELinux profiles to restrict Sudo capabilities
3. Disable sudo for non-essential service accounts
4. Monitor /var/log/auth.log for sudo execution attempts
DETECTION RULES:
1. Monitor for segmentation faults in sudo process: grep 'sudo.*segfault' /var/log/syslog
2. Alert on unexpected privilege escalation: auditctl -w /etc/sudoers -p wa -k sudoers_changes
3. Monitor for heap corruption patterns in core dumps
4. Track failed sudo attempts: grep 'sudo.*command not allowed' /var/log/auth.log
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع الأنظمة التي تقوم بتشغيل إصدارات Sudo السابقة للإصدار 1.9.5p2 باستخدام: sudo --version
2. تقييد الوصول المحلي للأنظمة التي تحتوي على إصدارات Sudo الضعيفة حتى يتم إكمال التصحيح
3. مراقبة محاولات الاستغلال باستخدام أدوات مراقبة العمليات
إرشادات التصحيح:
1. تحديث Sudo إلى الإصدار 1.9.5p2 أو أحدث على الفور
2. لـ RHEL/CentOS: yum update sudo
3. لـ Ubuntu/Debian: apt-get update && apt-get install sudo
4. لـ SLES: zypper update sudo
5. التحقق من تثبيت التصحيح: sudo --version (يجب أن يظهر 1.9.5p2 أو أحدث)
الضوابط البديلة (إذا لم يكن التصحيح الفوري ممكناً):
1. تقييد وصول sudo عبر /etc/sudoers للمستخدمين الأساسيين فقط
2. تنفيذ ملفات تعريف AppArmor أو SELinux لتقييد قدرات Sudo
3. تعطيل sudo للحسابات الخدمية غير الأساسية
4. مراقبة /var/log/auth.log لمحاولات تنفيذ sudo
قواعد الكشف:
1. مراقبة أخطاء التجزئة في عملية sudo: grep 'sudo.*segfault' /var/log/syslog
2. تنبيه على تصعيد الامتيازات غير المتوقع: auditctl -w /etc/sudoers -p wa -k sudoers_changes
3. مراقبة أنماط تلف الذاكرة في ملفات core dumps
4. تتبع محاولات sudo الفاشلة: grep 'sudo.*command not allowed' /var/log/auth.log
📋 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.6.2.1 - Restriction of Access to Information
ECC 2024 A.12.2.1 - Installation of Software on Operational Systems
🔵 SAMA CSF
SAMA CSF ID.AM-2 - Software Inventory
SAMA CSF PR.AC-1 - Access Control Policy
SAMA CSF PR.PT-3 - Access Restrictions for Change
SAMA CSF DE.CM-1 - Network Monitoring
🟡 ISO 27001:2022
ISO 27001:2022 A.5.15 - Access Control
ISO 27001:2022 A.6.2 - Privileged Access Rights
ISO 27001:2022 A.8.1 - User Endpoint Devices
ISO 27001:2022 A.12.6.1 - Management of Technical Vulnerabilities
🟣 PCI DSS v4.0
PCI DSS 2.2.4 - Configure System Security Parameters
PCI DSS 6.2 - Ensure Security Patches Installed
PCI DSS 8.1 - Assign Unique ID to Each User
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
Sudo:Sudo