CVE-2020-1379
📋 TL;DR
CVE-2020-1379 is a memory corruption vulnerability in Windows Media Foundation that allows attackers to execute arbitrary code with user privileges. It affects Windows systems and can be exploited through malicious documents or webpages. Users who open untrusted files or visit malicious sites are at risk.
💻 Affected Systems
- Windows Media Foundation
📦 What is this software?
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 7 by Microsoft
Windows 8.1 by Microsoft
Windows Rt 8.1 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining administrative privileges, installing malware, stealing data, and creating persistent backdoors.
Likely Case
Limited user-level compromise on individual workstations, potentially leading to data theft, ransomware deployment, or lateral movement within a network.
If Mitigated
No impact if systems are fully patched and users follow security best practices regarding untrusted content.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file or visiting malicious site). No public exploit code was available at disclosure.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: July 2020 security updates (KB4565483 for Windows 10 2004, KB4565503 for 1909, etc.)
Vendor Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1379
Restart Required: Yes
Instructions:
1. Apply July 2020 Windows security updates via Windows Update. 2. For enterprise: Deploy through WSUS or SCCM. 3. Verify installation in Windows Update history.
🔧 Temporary Workarounds
Disable Windows Media Foundation
windowsDisables the vulnerable component but may break media functionality
dism /online /disable-feature /featurename:WindowsMediaPlayer
dism /online /disable-feature /featurename:MediaPlayback
Restrict file types
windowsBlock execution of suspicious media files via Group Policy
🧯 If You Can't Patch
- Implement application whitelisting to prevent unauthorized program execution
- Use network segmentation to isolate vulnerable systems and restrict internet access
🔍 How to Verify
Check if Vulnerable:
Check if July 2020 security updates are installed via 'winver' or Windows Update historyCheck Version:
wmic qfe list | findstr KB4565483Verify Fix Applied:
Verify KB4565483 (or equivalent for your version) is installed in Windows Update history📡 Detection & Monitoring
Log Indicators:
- Windows Event Logs showing media foundation crashes (Event ID 1000)
- Unexpected process creation from media-related executables
Network Indicators:
- Outbound connections from media processes to suspicious IPs
- Downloads of unusual media file types
SIEM Query:
EventID=1000 AND Source="Application Error" AND ProcessName="*mf*.exe"