CVE-2024-37989
📋 TL;DR
This Secure Boot vulnerability allows attackers to bypass security features and execute unauthorized code during the boot process. It affects systems with Secure Boot enabled, primarily Windows devices and potentially other UEFI-based systems. Attackers could gain persistence or compromise system integrity before the operating system loads.
💻 Affected Systems
- Windows Secure Boot
- UEFI firmware implementations
📦 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
Complete system compromise with persistent malware that survives OS reinstallation, enabling data theft, ransomware deployment, or espionage at firmware level.
Likely Case
Attackers bypass Secure Boot to load malicious drivers or bootkits, gaining elevated privileges and persistence on targeted systems.
If Mitigated
With proper controls like physical security and firmware integrity monitoring, impact limited to isolated systems with attacker requiring physical or administrative access.
🎯 Exploit Status
Requires administrative privileges or physical access to modify boot configuration. Exploitation involves manipulating boot components.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Microsoft Security Update Guide for specific KB numbers
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-37989
Restart Required: Yes
Instructions:
1. Apply latest Windows updates via Windows Update. 2. For managed environments, deploy through WSUS or Microsoft Endpoint Manager. 3. Ensure UEFI firmware is updated from device manufacturer. 4. Reboot system to complete installation.
🔧 Temporary Workarounds
Disable Secure Boot
allTemporarily disable Secure Boot in UEFI settings to prevent exploitation (not recommended for production).
Enable Secure Boot with custom keys
allReplace default Secure Boot keys with organization-managed keys to control boot components.
🧯 If You Can't Patch
- Implement strict physical security controls to prevent unauthorized access to systems
- Restrict administrative privileges and monitor for unauthorized boot configuration changes
🔍 How to Verify
Check if Vulnerable:
Check if Secure Boot is enabled in UEFI settings and verify system has not applied the security update.Check Version:
On Windows: 'systeminfo | findstr /B /C:"OS Name" /C:"OS Version"'Verify Fix Applied:
Verify Windows Update history contains the relevant security update and confirm Secure Boot status shows as active and properly configured.📡 Detection & Monitoring
Log Indicators:
- UEFI/BIOS configuration changes in system logs
- Windows Event Log entries related to Secure Boot or boot integrity violations
Network Indicators:
- Unusual network traffic from systems during boot process
- Connections to suspicious domains/IPs from early boot stages
SIEM Query:
EventID=12 OR EventID=13 (System events) with keywords 'Secure Boot', 'UEFI', or 'boot' in description