CVE-2024-38187
📋 TL;DR
This vulnerability allows an authenticated attacker to exploit a flaw in a Windows kernel-mode driver to gain SYSTEM-level privileges. It affects Windows systems where an attacker already has local user access. The vulnerability enables privilege escalation from a lower-privileged account to full system control.
💻 Affected Systems
- Microsoft Windows
📦 What is this software?
Windows 10 1607 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 21h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 11 21h2 by Microsoft
Windows 11 22h2 by Microsoft
Windows 11 23h2 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with SYSTEM privileges, enabling installation of persistent malware, credential theft, lateral movement, and disabling of security controls.
Likely Case
Local privilege escalation allowing attackers to bypass security restrictions, install additional malware, or access protected system resources.
If Mitigated
Limited impact if proper endpoint protection, least privilege principles, and network segmentation are in place.
🎯 Exploit Status
Requires local authenticated access and knowledge of driver exploitation techniques. No public exploit code available at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: July 2024 security updates (KB5040442 for Windows 10, KB5040437 for Windows 11, etc.)
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-38187
Restart Required: Yes
Instructions:
1. Apply July 2024 Windows security updates via Windows Update. 2. For enterprise environments, deploy through WSUS or Microsoft Endpoint Configuration Manager. 3. Restart systems after patch installation.
🔧 Temporary Workarounds
Restrict driver loading
windowsConfigure Windows to only load signed drivers with valid certificates
bcdedit /set nointegritychecks off
bcdedit /set testsigning off
Enable HVCI (Hypervisor-protected Code Integrity)
windowsEnable memory integrity protection to prevent unauthorized driver loading
🧯 If You Can't Patch
- Implement strict least privilege access controls to limit local user privileges
- Deploy endpoint detection and response (EDR) solutions with kernel-mode driver monitoring
🔍 How to Verify
Check if Vulnerable:
Check if July 2024 security updates are installed via 'wmic qfe list' or 'systeminfo' commandCheck Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify KB5040442 (Windows 10) or KB5040437 (Windows 11) is installed in Installed Updates📡 Detection & Monitoring
Log Indicators:
- Event ID 4697: Service installation
- Suspicious driver loading events
- Unexpected SYSTEM privilege escalation
Network Indicators:
- Unusual outbound connections following local privilege escalation
SIEM Query:
EventID=4697 OR (EventID=4688 AND NewProcessName LIKE '%cmd.exe%' AND SubjectUserName!=SYSTEM AND TokenElevationType=%%1938)