CVE-2024-30085
📋 TL;DR
This vulnerability in the Windows Cloud Files Mini Filter Driver allows an authenticated attacker to gain SYSTEM-level privileges on affected systems. It affects Windows 10, 11, and Windows Server versions where the driver is present. Successful exploitation requires the attacker to already have some level of access to the target system.
💻 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
⚠️ Risk & Real-World Impact
Worst Case
An attacker with initial access can escalate to SYSTEM privileges, enabling complete system compromise, installation of persistent malware, credential theft, and lateral movement across the network.
Likely Case
Malicious insiders or attackers who have gained initial foothold through phishing or other means use this to escalate privileges and maintain persistence on compromised systems.
If Mitigated
With proper patch management and least privilege principles, impact is limited to isolated systems with no lateral movement capability.
🎯 Exploit Status
Microsoft has not disclosed technical details, but driver vulnerabilities often have low exploitation complexity once understood.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: May 2024 security updates (KB5037771 for Windows 11, KB5037768 for Windows 10, etc.)
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-30085
Restart Required: Yes
Instructions:
1. Apply May 2024 Windows security updates via Windows Update. 2. For enterprise: Deploy through WSUS, Microsoft Endpoint Configuration Manager, or Microsoft Intune. 3. Restart systems after patch installation.
🔧 Temporary Workarounds
Disable Cloud Files Mini Filter Driver
windowsTemporarily disable the vulnerable driver component (may affect OneDrive/cloud file functionality)
fltmc unload cldflt
🧯 If You Can't Patch
- Implement strict least privilege access controls to limit initial access opportunities
- Segment networks to prevent lateral movement from compromised systems
🔍 How to Verify
Check if Vulnerable:
Check if May 2024 security updates are installed via 'systeminfo' command or Windows Update historyCheck Version:
wmic qfe list | findstr KB5037771 KB5037768Verify Fix Applied:
Verify KB5037771 (Win11) or KB5037768 (Win10) is installed and system has been restarted📡 Detection & Monitoring
Log Indicators:
- Event ID 4697: Service installation attempts
- Suspicious driver loading events
- Privilege escalation attempts in security logs
Network Indicators:
- Unusual outbound connections from systems after privilege escalation
- Lateral movement attempts to other systems
SIEM Query:
EventID=4697 OR (EventID=4688 AND NewProcessName LIKE '%cldflt%')