CVE-2024-38050
📋 TL;DR
This vulnerability allows an authenticated attacker to elevate privileges on Windows systems by exploiting the Workstation Service. It affects Windows 10, 11, Server 2019, and Server 2022 systems where an attacker has initial access.
💻 Affected Systems
- Windows 10
- Windows 11
- 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
An attacker gains SYSTEM-level privileges, enabling complete system compromise, credential theft, persistence establishment, and lateral movement across the network.
Likely Case
An authenticated attacker with standard user privileges escalates to SYSTEM or administrator privileges to install malware, disable security controls, or access sensitive data.
If Mitigated
With proper patch management and least privilege principles, impact is limited to isolated systems with minimal lateral movement capability.
🎯 Exploit Status
Requires authenticated access and local execution. No public exploit code available as of analysis.
🛠️ 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-2024-38050
Restart Required: Yes
Instructions:
1. Apply July 2024 Windows security updates via Windows Update. 2. For enterprise: Deploy through WSUS, SCCM, or Intune. 3. Restart affected systems after patch installation.
🔧 Temporary Workarounds
Disable Workstation Service
windowsDisables the vulnerable service but may impact network file sharing functionality
sc config lanmanworkstation start= disabled
sc stop lanmanworkstation
Restrict Service Permissions
windowsApply stricter ACLs to Workstation Service to limit who can interact with it
sc sdset lanmanworkstation D:(A;;CCLCSWRPWPDTLOCRRC;;;SY)(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;BA)(A;;CCLCSWLOCRRC;;;IU)(A;;CCLCSWLOCRRC;;;SU)
🧯 If You Can't Patch
- Implement network segmentation to isolate vulnerable systems
- Apply principle of least privilege and monitor for privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check Windows version and patch level: systeminfo | findstr /B /C:"OS Name" /C:"OS Version" /C:"Hotfix(s)"Check Version:
winverVerify Fix Applied:
Verify July 2024 security updates are installed: wmic qfe list | findstr "KB5040442 KB5040437 KB5040434"📡 Detection & Monitoring
Log Indicators:
- Event ID 4688 with suspicious parent processes
- Unexpected service control operations on Workstation Service
- Privilege escalation attempts in security logs
Network Indicators:
- Unusual SMB traffic patterns from non-admin users
- Lateral movement attempts following local privilege escalation
SIEM Query:
source="windows_security" EventID=4688 NewProcessName="*" ParentProcessName="*" IntegrityLevel="High" OR IntegrityLevel="System"