CVE-2024-28899
📋 TL;DR
This vulnerability allows attackers to bypass Secure Boot protections on affected systems, potentially enabling them to load and execute unauthorized code during the boot process. It affects systems with Secure Boot enabled, primarily Windows devices. Attackers could gain elevated privileges and compromise system integrity.
💻 Affected Systems
- Windows Secure Boot
📦 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 installation that survives reboots, enabling data theft, ransomware deployment, or system control.
Likely Case
Attackers bypass Secure Boot to install bootkits or rootkits that maintain persistence and evade detection, leading to credential theft and lateral movement.
If Mitigated
With proper controls like patching and secure boot enforcement, the attack surface is reduced, though physical access risks remain.
🎯 Exploit Status
Exploitation likely requires local access or administrative privileges; no public exploits known at this time.
🛠️ 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-2024-28899
Restart Required: Yes
Instructions:
1. Apply the latest Windows security updates from Microsoft. 2. Ensure Secure Boot remains enabled post-update. 3. Verify the patch is installed via Windows Update history.
🔧 Temporary Workarounds
Enable Secure Boot Enforcement
windowsEnsure Secure Boot is enabled and properly configured in UEFI/BIOS settings to maintain boot integrity.
🧯 If You Can't Patch
- Restrict physical and administrative access to vulnerable systems to reduce attack surface.
- Implement strict access controls and monitoring for boot-related activities and unauthorized changes.
🔍 How to Verify
Check if Vulnerable:
Check if Secure Boot is enabled via 'Confirm-SecureBootUEFI' in PowerShell; verify Windows version against patched releases.Check Version:
wmic os get versionVerify Fix Applied:
Confirm the security update is installed via 'Get-Hotfix' in PowerShell or Windows Update history; re-run Secure Boot verification.📡 Detection & Monitoring
Log Indicators:
- Unexpected Secure Boot policy changes in Windows Event Logs (Event ID 1035, 1036)
- Unauthorized bootloader modifications
Network Indicators:
- Unusual outbound connections during boot process
- Anomalous network traffic from system startup
SIEM Query:
EventID=1035 OR EventID=1036 | where SecureBootStatus changed