CVE-2024-38180
📋 TL;DR
This vulnerability allows attackers to bypass Windows SmartScreen security checks, potentially enabling them to execute malicious files without proper warnings. It affects Windows systems with SmartScreen enabled, primarily impacting users who download or open files from untrusted sources.
💻 Affected Systems
- Windows SmartScreen
📦 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 via execution of malicious payloads that bypass all SmartScreen protections, leading to ransomware deployment, data theft, or persistent backdoor installation.
Likely Case
Users tricked into downloading malicious files that appear legitimate, leading to malware infection, credential theft, or system compromise.
If Mitigated
Limited impact with proper endpoint protection, user training, and network segmentation preventing successful exploitation.
🎯 Exploit Status
Exploitation requires user interaction (opening/downloading malicious files). No public exploit code available at disclosure.
🛠️ 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-2024-38180
Restart Required: Yes
Instructions:
1. Apply July 2024 Windows security updates via Windows Update. 2. For enterprise: Deploy through WSUS or Microsoft Endpoint Configuration Manager. 3. Verify update installation in Windows Update history.
🔧 Temporary Workarounds
Disable SmartScreen (Not Recommended)
windowsTemporarily disable SmartScreen to prevent bypass, but removes security protection
Not recommended due to security impact
Enhanced Monitoring
allIncrease monitoring for file execution events and SmartScreen bypass attempts
🧯 If You Can't Patch
- Implement application allowlisting to restrict execution of unauthorized files
- Deploy enhanced endpoint detection and response (EDR) solutions to detect bypass attempts
🔍 How to Verify
Check if Vulnerable:
Check if July 2024 security updates are installed via Windows Update history or 'winver' command showing build numbers after patch application.Check Version:
winverVerify Fix Applied:
Verify KB5040442 (Windows 11) or KB5040437 (Windows 10) is installed in Installed Updates list.📡 Detection & Monitoring
Log Indicators:
- Windows Defender/AV logs showing SmartScreen bypass events
- Event ID 1116/1117 from Windows Defender operations
- Unexpected file executions from untrusted locations
Network Indicators:
- Downloads from suspicious domains followed by immediate execution
- Unusual outbound connections after file execution
SIEM Query:
EventID=1116 OR EventID=1117 | where ProcessName contains "SmartScreen" AND ResultCode!=0