CVE-2023-28272
📋 TL;DR
CVE-2023-28272 is a Windows kernel elevation of privilege vulnerability that allows authenticated attackers to execute arbitrary code with SYSTEM privileges. This affects Windows operating systems where an attacker could gain complete control over the system. The vulnerability requires local access to exploit.
💻 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 attacker gaining SYSTEM privileges, installing persistent malware, accessing all data, and pivoting to other systems.
Likely Case
Local privilege escalation allowing attackers to bypass security controls, install additional malware, or access protected resources.
If Mitigated
Limited impact if proper patch management and least privilege principles are enforced, though local attackers could still gain elevated access.
🎯 Exploit Status
Exploitation requires local access and authenticated user context. Proof-of-concept code has been publicly released.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: April 2023 security updates (KB5025221, KB5025239, etc.)
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-28272
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 access
windowsLimit physical and remote local access to vulnerable systems to reduce attack surface
Implement least privilege
windowsEnsure users operate with minimal necessary privileges to limit impact of successful exploitation
🧯 If You Can't Patch
- Isolate vulnerable systems from critical networks and sensitive data
- Implement strict access controls and monitor for suspicious local privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check Windows Update history for April 2023 security updates or use 'systeminfo' command to verify OS build versionCheck Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify April 2023 security updates are installed via Windows Update history or check OS build version matches patched versions📡 Detection & Monitoring
Log Indicators:
- Windows Security Event ID 4688 (process creation) showing unexpected SYSTEM privilege processes
- Event ID 4672 (special privileges assigned)
Network Indicators:
- Unusual outbound connections from SYSTEM context processes
- Lateral movement attempts from recently compromised systems
SIEM Query:
source="windows_security" EventID=4688 OR EventID=4672 | where NewProcessName contains "cmd.exe" OR NewProcessName contains "powershell.exe" | where SubjectUserName != "SYSTEM" AND TokenElevationType="%%1936"