CVE-2024-29988
📋 TL;DR
This vulnerability allows attackers to bypass Microsoft's SmartScreen security prompts, which normally warn users about potentially malicious files or websites. Attackers can trick users into executing malicious content without seeing the usual security warnings. This affects Windows systems with SmartScreen enabled.
💻 Affected Systems
- Microsoft Windows
- Microsoft Edge
- Microsoft Defender SmartScreen
📦 What is this software?
Windows 10 1809 by Microsoft
Windows 10 1809 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 via execution of malicious files that bypass all SmartScreen warnings, leading to ransomware deployment, data theft, or persistent backdoor installation.
Likely Case
Users inadvertently executing malware (trojans, info-stealers, ransomware) after being tricked into bypassing SmartScreen warnings via social engineering or malicious links.
If Mitigated
Limited impact with proper endpoint protection, user training, and network segmentation preventing successful exploitation even if bypass occurs.
🎯 Exploit Status
Exploitation requires user interaction (clicking links/files) but is technically simple once the bypass method is known. Microsoft indicates awareness of exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: April 2024 security updates (KB5036893 for Windows 11, KB5036892 for Windows 10, etc.)
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-29988
Restart Required: Yes
Instructions:
1. Apply April 2024 Windows security updates via Windows Update. 2. For enterprise: Deploy patches through WSUS, Microsoft Endpoint Configuration Manager, or equivalent. 3. Restart systems after patch installation.
🔧 Temporary Workarounds
Disable SmartScreen (NOT RECOMMENDED)
windowsTemporarily disables SmartScreen feature but removes important security protection
Not recommended due to security degradation
Enhanced security configuration
windowsConfigure Windows Defender Application Control or AppLocker to restrict untrusted executables
🧯 If You Can't Patch
- Implement network segmentation to limit lateral movement if exploitation occurs
- Deploy endpoint detection and response (EDR) solutions to detect malicious file execution attempts
🔍 How to Verify
Check if Vulnerable:
Check Windows Update history for April 2024 security updates or run: systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Check Version:
winverVerify Fix Applied:
Verify KB5036893 (Windows 11) or KB5036892 (Windows 10) is installed via: wmic qfe list | findstr "5036893 5036892"📡 Detection & Monitoring
Log Indicators:
- Windows Defender/SmartScreen logs showing bypass events
- Event ID 1125, 1126 in Windows Defender operational logs
- Unexpected process execution from untrusted locations
Network Indicators:
- Downloads from suspicious domains followed by immediate execution
- Unusual outbound connections after file execution
SIEM Query:
Process creation where parent process is explorer.exe and command line contains suspicious parameters or URLs