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Vulnerabilities

CVE-2021-4034

Critical 🇺🇸 CISA KEV ⚡ Exploit Available
Red Hat Polkit Out-of-Bounds Read and Write Vulnerability — The Red Hat polkit pkexec utility contains an out-of-bounds read and write vulnerability that allows for privilege escalation with administr
Published: Jun 27, 2022  ·  Source: CISA_KEV
CVSS v3
9.0
🔗 NVD Official
📄 Description (English)

Red Hat Polkit Out-of-Bounds Read and Write Vulnerability — The Red Hat polkit pkexec utility contains an out-of-bounds read and write vulnerability that allows for privilege escalation with administrative rights.

🤖 AI Executive Summary

CVE-2021-4034 is a critical privilege escalation vulnerability in Red Hat Polkit's pkexec utility that allows local attackers to gain root privileges through out-of-bounds memory access. With a CVSS score of 9.0 and publicly available exploits, this vulnerability poses an immediate threat to all Linux systems running vulnerable Polkit versions. Immediate patching is essential for all Saudi organizations operating Linux infrastructure.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 21, 2026 07:00
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability critically impacts Saudi government agencies (NCA, NCSC), banking sector (SAMA-regulated institutions, major banks), telecommunications (STC, Mobily), energy sector (Saudi Aramco, SEC), and healthcare organizations. Any Linux-based server, workstation, or containerized environment is at risk. The vulnerability enables complete system compromise, making it particularly dangerous for critical infrastructure operators and financial institutions subject to SAMA oversight.
🏢 Affected Saudi Sectors
Government (NCA, NCSC, Ministry of Interior) Banking and Financial Services (SAMA-regulated) Telecommunications (STC, Mobily, Zain) Energy (Saudi Aramco, SEC) Healthcare (MOH, Private Hospitals) Education (Universities, Research Institutions) Critical Infrastructure Operators
⚖️ Saudi Risk Score (AI)
9.5
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all systems running Polkit (check: rpm -qa | grep polkit or dpkg -l | grep policykit)
2. Prioritize patching for: domain controllers, database servers, payment systems, and critical infrastructure
3. Implement temporary access controls: restrict local user access, disable unnecessary user accounts, enforce strong SSH key-based authentication

PATCHING GUIDANCE:
1. Red Hat/CentOS: yum update polkit or dnf update polkit
2. Debian/Ubuntu: apt-get update && apt-get install policykit-1
3. Verify patch: pkexec --version (should show patched version)
4. Restart affected services and reboot systems if required

COMPENSATING CONTROLS (if immediate patching delayed):
1. Remove execute permissions from pkexec: chmod 000 /usr/bin/pkexec (if not required)
2. Implement AppArmor/SELinux profiles to restrict pkexec execution
3. Monitor and log all pkexec execution attempts
4. Restrict sudo access and implement privilege escalation auditing

DETECTION RULES:
1. Monitor for pkexec process execution with unusual arguments
2. Alert on any pkexec execution from non-standard user accounts
3. Log all privilege escalation attempts via auditd: auditctl -w /usr/bin/pkexec -p x
4. Search logs for segmentation faults or memory access violations related to polkit
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع الأنظمة التي تعمل بـ Polkit (تحقق: rpm -qa | grep polkit أو dpkg -l | grep policykit)
2. إعطاء الأولوية لتصحيح: متحكمات المجال وخوادم قواعد البيانات والأنظمة المالية والبنية التحتية الحرجة
3. تطبيق ضوابط وصول مؤقتة: تقييد وصول المستخدمين المحليين وتعطيل حسابات المستخدمين غير الضرورية وفرض المصادقة القائمة على مفاتيح SSH

إرشادات التصحيح:
1. Red Hat/CentOS: yum update polkit أو dnf update polkit
2. Debian/Ubuntu: apt-get update && apt-get install policykit-1
3. التحقق من التصحيح: pkexec --version (يجب أن يظهر الإصدار المصحح)
4. إعادة تشغيل الخدمات المتأثرة وإعادة تشغيل الأنظمة إذا لزم الأمر

الضوابط البديلة (إذا تأخر التصحيح الفوري):
1. إزالة أذونات التنفيذ من pkexec: chmod 000 /usr/bin/pkexec (إذا لم تكن مطلوبة)
2. تطبيق ملفات تعريف AppArmor/SELinux لتقييد تنفيذ pkexec
3. مراقبة وتسجيل جميع محاولات تنفيذ pkexec
4. تقييد وصول sudo وتطبيق تدقيق تصعيد الامتيازات

قواعد الكشف:
1. مراقبة تنفيذ عملية pkexec بحجج غير عادية
2. التنبيه على أي تنفيذ pkexec من حسابات مستخدمين غير قياسية
3. تسجيل جميع محاولات تصعيد الامتيازات عبر auditd: auditctl -w /usr/bin/pkexec -p x
4. البحث في السجلات عن أخطاء التجزئة أو انتهاكات الوصول إلى الذاكرة المتعلقة بـ polkit
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.5.1.1 - Access Control Policies ECC 2024 A.8.1.1 - User Endpoint Devices ECC 2024 A.8.2.1 - Privileged Access Rights ECC 2024 A.8.2.3 - Management of Privileged Access Rights ECC 2024 A.12.4.1 - Event Logging ECC 2024 A.12.4.3 - Administrator and Operator Logs
🔵 SAMA CSF
SAMA CSF ID.AM-2 - Software Inventory SAMA CSF PR.AC-1 - Access Control Policy SAMA CSF PR.AC-4 - Access Rights Management SAMA CSF DE.CM-1 - System Monitoring SAMA CSF DE.AE-1 - Audit Logs
🟡 ISO 27001:2022
ISO 27001:2022 A.5.15 - Access Control 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.12.4 - Logging
🟣 PCI DSS v4.0
PCI DSS 2.2.4 - Configure System Security Parameters PCI DSS 6.2 - Ensure Security Patches Installed PCI DSS 7.1 - Limit Access to System Components PCI DSS 10.2 - Implement Automated Audit Trails
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
Red Hat:Polkit
📊 CVSS Score
9.0
/ 10.0 — Critical
📋 Quick Facts
Severity Critical
CVSS Score9.0
EPSS87.26%
Exploit ✓ Yes
Patch ✓ Yes
CISA KEV🇺🇸 Yes
KEV Due Date2022-07-18
Published 2022-06-27
Source Feed cisa_kev
Views 2
🇸🇦 Saudi Risk Score
9.5
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
kev actively-exploited
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