CVE-2024-38215
📋 TL;DR
This vulnerability in the Windows Cloud Files Mini Filter Driver allows an attacker to gain SYSTEM-level privileges on affected systems. It affects Windows 10, 11, Server 2019, and Server 2022. An attacker must already have local access to exploit this vulnerability.
💻 Affected Systems
- Windows 10
- Windows 11
- Windows Server 2019
- Windows Server 2022
📦 What is this software?
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, and persistence mechanisms.
Likely Case
Local privilege escalation from a standard user account to SYSTEM, allowing attackers to bypass security controls and execute arbitrary code.
If Mitigated
Limited impact if proper endpoint protection and least privilege principles are enforced, though local privilege escalation remains possible.
🎯 Exploit Status
Requires local access and ability to execute code as a standard user. No public exploit code available as of knowledge cutoff.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: July 2024 security updates (KB5040442 for Windows 11, KB5040437 for Windows 10, etc.)
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-38215
Restart Required: Yes
Instructions:
1. Apply July 2024 Windows security updates via Windows Update. 2. For enterprise environments, deploy updates through WSUS or Microsoft Endpoint Configuration Manager. 3. Restart systems after update installation.
🔧 Temporary Workarounds
Disable Cloud Files Mini Filter Driver
windowsTemporarily disable the vulnerable driver component (may impact cloud storage functionality)
fltmc unload cldflt
🧯 If You Can't Patch
- Implement strict least privilege access controls to limit standard user capabilities
- Deploy endpoint detection and response (EDR) solutions to monitor for privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check Windows version and update status via 'winver' and verify July 2024 security updates are not installedCheck 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 'systeminfo' command📡 Detection & Monitoring
Log Indicators:
- Event ID 4697 (Service installation) related to cldflt.sys
- Unexpected privilege escalation events in security logs
Network Indicators:
- No network indicators - local exploitation only
SIEM Query:
EventID=4697 AND (ServiceFileName="*cldflt*" OR ServiceName="Cloud Files Mini Filter Driver")