CVE-2023-28222
📋 TL;DR
This Windows kernel vulnerability allows attackers to elevate privileges from user mode to kernel mode, potentially gaining SYSTEM-level access. It affects Windows operating systems and requires an attacker to already have some level of access to the target system.
💻 Affected Systems
- Windows 10
- Windows 11
- Windows Server 2016
- Windows Server 2019
- Windows Server 2022
📦 What is this software?
Windows 10 1507 by Microsoft
Windows 10 1607 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 20h2 by Microsoft
Windows 10 21h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 11 21h2 by Microsoft
Windows 11 22h2 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with SYSTEM privileges, enabling installation of persistent malware, credential theft, and disabling of security controls.
Likely Case
Local privilege escalation allowing attackers to bypass security restrictions, access sensitive data, and maintain persistence on compromised systems.
If Mitigated
Limited impact if proper patch management and least privilege principles are enforced, though still concerning for lateral movement.
🎯 Exploit Status
Requires local access and user privileges; exploit code has been publicly released.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: April 2023 security updates (KB5025224, KB5025239, etc.)
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-28222
Restart Required: Yes
Instructions:
1. Apply April 2023 Windows security updates via Windows Update. 2. For enterprise environments, deploy through WSUS or SCCM. 3. Restart systems after patch installation.
🔧 Temporary Workarounds
Restrict local user privileges
windowsImplement least privilege principles to limit impact if exploited
Enable Windows Defender Exploit Guard
windowsUse exploit protection to mitigate kernel exploits
🧯 If You Can't Patch
- Implement strict network segmentation to limit lateral movement
- Deploy endpoint detection and response (EDR) solutions with kernel monitoring
🔍 How to Verify
Check if Vulnerable:
Check Windows Update history for April 2023 security updates or use 'systeminfo' command to verify OS build numberCheck Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify April 2023 security updates are installed via Windows Update or 'wmic qfe list' command📡 Detection & Monitoring
Log Indicators:
- Unexpected privilege escalation events
- Suspicious kernel mode driver loading
- Process creation with SYSTEM privileges from user accounts
Network Indicators:
- Lateral movement following local compromise
- Unusual outbound connections from previously compromised systems
SIEM Query:
EventID=4688 AND NewProcessName="*" AND SubjectUserName!="SYSTEM" AND TokenElevationType="%%1938"