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Vulnerabilities

CVE-2019-1253

Critical 🇺🇸 CISA KEV ⚡ Exploit Available
Microsoft Windows AppX Deployment Server Privilege Escalation Vulnerability — A privilege escalation vulnerability exists when the Windows AppX Deployment Server improperly handles junctions.
Published: Mar 15, 2022  ·  Source: CISA_KEV
CVSS v3
9.0
🔗 NVD Official
📄 Description (English)

Microsoft Windows AppX Deployment Server Privilege Escalation Vulnerability — A privilege escalation vulnerability exists when the Windows AppX Deployment Server improperly handles junctions.

🤖 AI Executive Summary

CVE-2019-1253 is a critical privilege escalation vulnerability in the Windows AppX Deployment Server that allows attackers to exploit improper junction handling to gain elevated privileges. With a CVSS score of 9.0 and a publicly available exploit, this vulnerability poses an immediate and severe threat to any Windows environment. An attacker with local access can leverage this flaw to escalate privileges to SYSTEM level, enabling full system compromise. Immediate patching is strongly recommended given the availability of both exploit code and an official Microsoft patch.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 13, 2026 19:18
🇸🇦 Saudi Arabia Impact Assessment
هذه الثغرة تؤثر بشكل مباشر على المؤسسات السعودية التي تعتمد على بيئات Windows في قطاعات متعددة. قطاع الحكومة والجهات الحكومية المرتبطة بالهيئة الوطنية للأمن السيبراني (NCA) معرضة لخطر كبير نظراً للاعتماد الواسع على أنظمة Windows. قطاع البنوك والمؤسسات المالية الخاضعة لرقابة SAMA قد تتعرض لاختراق أنظمتها الداخلية مما يهدد سرية البيانات المالية. قطاع الطاقة بما فيه أرامكو السعودية وشركات المرافق قد يتعرض لتصعيد الصلاحيات في الأنظمة التشغيلية الحساسة. قطاع الاتصالات كشركة STC وغيرها معرض لخطر استغلال هذه الثغرة في البنية التحتية الداخلية. الخطر مرتفع بشكل خاص في البيئات التي تضم مستخدمين متعددين أو أنظمة مشتركة حيث يمكن للمهاجم ذو الوصول المحدود تصعيد صلاحياته.
🏢 Affected Saudi Sectors
Government Banking Energy Telecom Healthcare Defense Education
⚖️ Saudi Risk Score (AI)
9.0
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Apply Microsoft Security Update KB4516044 (September 2019 Patch Tuesday) immediately across all affected Windows systems.
2. Prioritize patching of internet-facing systems, jump servers, and shared workstations where multiple users have local access.
3. Audit local user accounts and restrict unnecessary local logon rights.

PATCHING GUIDANCE:
1. Deploy the patch via WSUS, SCCM, or Microsoft Update across all Windows endpoints and servers.
2. Verify patch deployment using: Get-HotFix -Id KB4516044
3. Prioritize: Domain Controllers > Critical Servers > Workstations.

COMPENSATING CONTROLS (if patching is delayed):
1. Restrict local logon access to sensitive systems using Group Policy (Deny log on locally).
2. Implement application whitelisting to prevent unauthorized AppX deployments.
3. Monitor and alert on unusual privilege escalation events in Windows Event Logs (Event ID 4672, 4673).
4. Disable AppX Deployment Service (AppXSvc) on systems where it is not required.
5. Enforce least privilege principles and remove unnecessary local admin rights.

DETECTION RULES:
1. Monitor Windows Event ID 4688 for unusual process creation with elevated tokens.
2. Alert on junction creation in sensitive directories (Sysmon Event ID 11 with junction type).
3. Deploy SIEM rules to detect AppXSvc anomalous behavior.
4. Use EDR solutions to detect known exploit signatures for CVE-2019-1253.
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تطبيق تحديث Microsoft الأمني KB4516044 (تحديثات سبتمبر 2019) فوراً على جميع أنظمة Windows المتأثرة.
2. إعطاء الأولوية لتصحيح الأنظمة المكشوفة على الإنترنت وخوادم القفز والمحطات المشتركة.
3. مراجعة حسابات المستخدمين المحليين وتقييد حقوق تسجيل الدخول المحلي غير الضرورية.

إرشادات التصحيح:
1. نشر التصحيح عبر WSUS أو SCCM أو Microsoft Update على جميع نقاط النهاية والخوادم.
2. التحقق من نشر التصحيح باستخدام: Get-HotFix -Id KB4516044
3. ترتيب الأولويات: وحدات التحكم بالنطاق > الخوادم الحرجة > محطات العمل.

ضوابط التعويض (في حال تأخر التصحيح):
1. تقييد الوصول المحلي إلى الأنظمة الحساسة باستخدام Group Policy.
2. تطبيق قوائم السماح للتطبيقات لمنع نشر AppX غير المصرح به.
3. مراقبة أحداث تصعيد الصلاحيات غير العادية في سجلات Windows (Event ID 4672, 4673).
4. تعطيل خدمة AppX Deployment (AppXSvc) على الأنظمة التي لا تحتاجها.
5. تطبيق مبدأ الصلاحيات الدنيا وإزالة حقوق المسؤول المحلي غير الضرورية.

قواعد الكشف:
1. مراقبة Event ID 4688 لاكتشاف إنشاء العمليات غير العادية بصلاحيات مرتفعة.
2. التنبيه عند إنشاء وصلات في المجلدات الحساسة (Sysmon Event ID 11).
3. نشر قواعد SIEM لاكتشاف السلوك الشاذ لـ AppXSvc.
4. استخدام حلول EDR للكشف عن توقيعات الاستغلال المعروفة لـ CVE-2019-1253.
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC-1-4-2: Cybersecurity Vulnerability Management ECC-1-4-3: Patch Management ECC-2-2-1: Access Control and Privilege Management ECC-2-3-1: System Hardening ECC-1-3-6: Security Monitoring and Logging
🔵 SAMA CSF
3.3.3: Vulnerability Management 3.3.4: Patch Management 3.2.2: Access Control 3.3.6: Security Monitoring 3.2.5: Privileged Access Management
🟡 ISO 27001:2022
A.8.8: Management of Technical Vulnerabilities A.8.2: Privileged Access Rights A.8.15: Logging A.8.19: Installation of Software on Operational Systems A.5.15: Access Control
🟣 PCI DSS v4.0
Requirement 6.3.3: All system components are protected from known vulnerabilities by installing applicable security patches Requirement 7.2: Access to system components and data is appropriately defined and assigned Requirement 10.2: Audit logs capture all individual user access to cardholder data
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
Microsoft:Windows
📊 CVSS Score
9.0
/ 10.0 — Critical
📋 Quick Facts
Severity Critical
CVSS Score9.0
EPSS30.23%
Exploit ✓ Yes
Patch ✓ Yes
CISA KEV🇺🇸 Yes
KEV Due Date2022-04-05
Published 2022-03-15
Source Feed cisa_kev
Views 1
🇸🇦 Saudi Risk Score
9.0
/ 10.0 — Saudi Risk
🏷️ Tags
kev actively-exploited ransomware
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