CVE-2024-38057
📋 TL;DR
This vulnerability in the Kernel Streaming WOW Thunk Service Driver allows attackers to gain elevated SYSTEM privileges on Windows systems. It affects Windows 10, 11, and Server versions where an authenticated attacker could execute arbitrary code with kernel-level permissions. The vulnerability stems from improper bounds checking in kernel memory operations.
💻 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 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, disabling security controls, and lateral movement across the network.
Likely Case
Local privilege escalation from standard user to SYSTEM, allowing attackers to bypass security controls, install backdoors, or access protected system resources.
If Mitigated
Limited impact if proper endpoint protection, application control, and least privilege principles are enforced, though kernel-level vulnerabilities remain serious.
🎯 Exploit Status
Requires local authenticated access. Exploitation involves kernel memory manipulation which requires specific technical knowledge.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: July 2024 security updates (KB5040442 for Windows 11, KB5040434 for Windows 10, etc.)
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-38057
Restart Required: Yes
Instructions:
1. Apply July 2024 Windows security updates via Windows Update. 2. For enterprise: Deploy through WSUS, Microsoft Endpoint Configuration Manager, or Microsoft Intune. 3. Verify update installation and restart systems.
🔧 Temporary Workarounds
Disable vulnerable driver
windowsDisable or restrict the Kernel Streaming WOW Thunk Service Driver if not required
sc config ks.sys start= disabled
sc stop ks.sys
Enable Hypervisor-protected Code Integrity
windowsEnable HVCI to provide additional protection against kernel exploits
🧯 If You Can't Patch
- Implement application control policies to prevent unauthorized code execution
- Enforce least privilege access and network segmentation to limit lateral movement
🔍 How to Verify
Check if Vulnerable:
Check Windows Update history for July 2024 security updates or run: wmic qfe list | findstr "5040442 5040434"Check Version:
winver or systeminfo | findstr "OS Name OS Version"Verify Fix Applied:
Verify July 2024 security updates are installed via Settings > Windows Update > Update history or using: systeminfo | findstr "KB5040442 KB5040434"📡 Detection & Monitoring
Log Indicators:
- Event ID 4688 with parent process spawning SYSTEM processes
- Unexpected kernel driver loads
- Security log entries showing privilege escalation
Network Indicators:
- Unusual outbound connections from SYSTEM processes
- Lateral movement attempts from previously compromised hosts
SIEM Query:
EventID=4688 AND NewProcessName="*" AND SubjectUserName!="SYSTEM" AND TokenElevationType="%%1938"