CVE-2024-38142
📋 TL;DR
This vulnerability allows an attacker with local access to elevate privileges from user mode to kernel mode in Windows Secure Kernel. It affects Windows systems with Secure Kernel enabled, primarily Windows 10 and 11 systems with virtualization-based security features.
💻 Affected Systems
- Windows 10
- Windows 11
- Windows Server 2022
📦 What is this software?
Windows 10 1507 by Microsoft
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
Windows 11 24h2 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with kernel-level access, allowing attackers to bypass security controls, install persistent malware, access sensitive data, and disable security mechanisms.
Likely Case
Local privilege escalation enabling attackers to gain administrative privileges, install unauthorized software, or access protected system resources.
If Mitigated
Limited impact due to existing security controls, with potential for detection through security monitoring before significant damage occurs.
🎯 Exploit Status
Requires local access and existing user privileges. Exploitation likely requires understanding of Windows kernel internals and Secure Kernel architecture.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: July 2024 security updates (KB5040435 for Windows 11, KB5040431 for Windows 10)
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-38142
Restart Required: Yes
Instructions:
1. Open Windows Update settings. 2. Check for updates. 3. Install July 2024 security updates. 4. Restart the system when prompted.
🔧 Temporary Workarounds
Disable Virtualization-Based Security
windowsDisables Secure Kernel Mode by turning off VBS features, which eliminates the vulnerability but reduces security posture.
reg add "HKLM\SYSTEM\CurrentControlSet\Control\DeviceGuard" /v "EnableVirtualizationBasedSecurity" /t REG_DWORD /d 0 /f
shutdown /r /t 0
🧯 If You Can't Patch
- Implement strict access controls and least privilege principles to limit local user access
- Enable enhanced monitoring for privilege escalation attempts and kernel-level activities
🔍 How to Verify
Check if Vulnerable:
Check if system has July 2024 security updates installed via 'systeminfo' command or Windows Update historyCheck Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify KB5040435 (Win11) or KB5040431 (Win10) is installed and systeminfo shows OS build number with July 2024 updates📡 Detection & Monitoring
Log Indicators:
- Event ID 4688 with privileged process creation
- Security log entries showing unexpected privilege changes
- Kernel-mode driver loading events
Network Indicators:
- Unusual outbound connections from system processes
- Lateral movement attempts following local privilege escalation
SIEM Query:
EventID=4688 AND NewProcessName="*" AND TokenElevationType="%%1938" OR EventID=4672 AND PrivilegeList="SeDebugPrivilege"