CVE-2024-28896
📋 TL;DR
CVE-2024-28896 is a Secure Boot security feature bypass vulnerability that allows an attacker with physical access or administrative privileges to bypass Secure Boot protections. This affects systems with Secure Boot enabled, potentially allowing unauthorized code execution during the boot process. The vulnerability impacts Windows systems with specific Secure Boot configurations.
💻 Affected Systems
- Microsoft Windows
📦 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 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
An attacker with physical access could install persistent malware that loads before the operating system, bypassing all operating system security controls and enabling complete system compromise.
Likely Case
An attacker with administrative privileges could bypass Secure Boot to load unauthorized boot components, potentially installing bootkits or other persistent malware.
If Mitigated
With proper physical security controls and administrative privilege restrictions, the attack surface is significantly reduced, though the vulnerability still exists in the Secure Boot implementation.
🎯 Exploit Status
Exploitation requires administrative privileges or physical access to the system. The vulnerability involves bypassing Secure Boot validation mechanisms.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Security updates released in April 2024
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-28896
Restart Required: Yes
Instructions:
1. Apply the latest Windows security updates from Microsoft. 2. For Windows Update: Run Windows Update and install all available updates. 3. For WSUS/SCCM: Deploy the April 2024 security updates. 4. Restart the system after applying updates.
🔧 Temporary Workarounds
Restrict Physical Access
allImplement strict physical security controls to prevent unauthorized physical access to systems.
Limit Administrative Privileges
allFollow least privilege principles and restrict administrative access to essential personnel only.
🧯 If You Can't Patch
- Implement strict physical security controls and monitoring for unauthorized physical access attempts.
- Enforce strong administrative privilege management and monitor for unusual administrative activity.
🔍 How to Verify
Check if Vulnerable:
Check if Secure Boot is enabled: In Windows, run 'Confirm-SecureBootUEFI' in PowerShell. If enabled and system has not been patched with April 2024 updates, it may be vulnerable.Check Version:
In Windows, run 'systeminfo | findstr /B /C:"OS Name" /C:"OS Version"' or check Windows Update history for April 2024 security updates.Verify Fix Applied:
Verify the system has the April 2024 security updates installed and Secure Boot is still functioning properly.📡 Detection & Monitoring
Log Indicators:
- Event ID 1035 in System logs related to Secure Boot policy violations
- Unexpected Secure Boot configuration changes
- Boot process anomalies in System logs
Network Indicators:
- Not applicable - this is a local system vulnerability
SIEM Query:
EventID=1035 AND Source="Microsoft-Windows-Security-SPP" | search "Secure Boot"