CVE-2024-20652
📋 TL;DR
This vulnerability allows attackers to bypass security features in Windows HTML platforms, potentially enabling malicious code execution or privilege escalation. It affects Windows systems with vulnerable HTML rendering components. Users who access untrusted HTML content are at risk.
💻 Affected Systems
- Windows 10
- Windows 11
- Windows Server 2016
- Windows Server 2019
- Windows Server 2022
📦 What is this software?
Windows 10 1507 by Microsoft
Windows 10 1507 by Microsoft
Windows 10 1607 by Microsoft
Windows 10 1607 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 21h2 by Microsoft
Windows 10 21h2 by Microsoft
Windows 10 21h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 11 21h2 by Microsoft
Windows 11 21h2 by Microsoft
Windows 11 22h2 by Microsoft
Windows 11 22h2 by Microsoft
Windows 11 23h2 by Microsoft
Windows 11 23h2 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through arbitrary code execution with elevated privileges, leading to data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Limited privilege escalation or security feature bypass allowing attackers to execute malicious scripts in a sandboxed environment, potentially leading to further exploitation.
If Mitigated
Minimal impact with proper patch management and security controls; isolated incidents with limited scope due to defense-in-depth measures.
🎯 Exploit Status
Exploitation requires user interaction (such as opening a malicious HTML file) and may require specific conditions. No public exploit code is currently available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: January 2024 security updates (KB5034123 for Windows 10, KB5034127 for Windows 11, etc.)
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-20652
Restart Required: Yes
Instructions:
1. Apply the January 2024 Windows security updates through Windows Update. 2. For enterprise environments, deploy updates via WSUS, SCCM, or Intune. 3. Restart systems after patch installation.
🔧 Temporary Workarounds
Disable HTML rendering in untrusted applications
windowsConfigure applications to block or sandbox HTML content from untrusted sources.
Implement application control policies
windowsUse Windows Defender Application Control or AppLocker to restrict execution of untrusted HTML applications.
🧯 If You Can't Patch
- Implement network segmentation to isolate vulnerable systems from critical assets.
- Deploy enhanced monitoring and logging for HTML-related process execution and file access.
🔍 How to Verify
Check if Vulnerable:
Check if January 2024 security updates are installed via 'Settings > Windows Update > Update history' or 'wmic qfe list' command.Check Version:
wmic qfe list | findstr KB5034123Verify Fix Applied:
Verify KB5034123 (Windows 10) or KB5034127 (Windows 11) is installed and system has been restarted.📡 Detection & Monitoring
Log Indicators:
- Unexpected HTML application launches
- Security feature bypass events in Windows Event Logs
- Process creation from HTML rendering components
Network Indicators:
- Outbound connections from HTML applications to suspicious domains
- Unusual HTTP/HTTPS traffic patterns
SIEM Query:
EventID=4688 AND (ProcessName LIKE '%mshtml%' OR CommandLine LIKE '%.html%')