CVE-2024-38144
📋 TL;DR
This vulnerability allows attackers to gain SYSTEM-level privileges on Windows systems by exploiting an integer overflow in the Kernel Streaming WOW Thunk Service Driver. It affects Windows systems where this driver is present and enabled, primarily impacting servers and workstations running vulnerable Windows versions.
💻 Affected Systems
- Windows
📦 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 SYSTEM privileges, enabling installation of malware, data theft, lateral movement, and persistence mechanisms.
Likely Case
Local privilege escalation from a lower-privileged user account to SYSTEM, enabling attackers to bypass security controls and maintain persistence.
If Mitigated
Limited impact if proper access controls, least privilege principles, and endpoint protection are in place to detect and block exploitation attempts.
🎯 Exploit Status
Requires local access and ability to execute code with some privileges. Exploitation involves triggering an integer overflow condition.
🛠️ 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-2024-38144
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
Disable Kernel Streaming WOW Thunk Service Driver
windowsDisables the vulnerable driver component if not required for system functionality.
sc config ks.sys start= disabled
sc stop ks.sys
🧯 If You Can't Patch
- Implement strict access controls and least privilege principles to limit local user privileges.
- Deploy endpoint detection and response (EDR) solutions to monitor for privilege escalation attempts.
🔍 How to Verify
Check if Vulnerable:
Check Windows version and patch level via winver or systeminfo command. Vulnerable if running affected Windows versions without July 2024 security updates.Check Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify July 2024 security updates are installed via Settings > Windows Update > Update history or using 'wmic qfe list' command.📡 Detection & Monitoring
Log Indicators:
- Event ID 4697 (Service installation) for ks.sys driver
- Unexpected privilege escalation events in security logs
Network Indicators:
- Not network exploitable - focus on host-based detection
SIEM Query:
EventID=4697 AND ServiceFileName="*ks.sys*" OR ProcessName="*ks*" AND PrivilegeChange