CVE-2024-26184
📋 TL;DR
CVE-2024-26184 is a Secure Boot security feature bypass vulnerability that allows attackers to circumvent Secure Boot protections on affected systems. This could enable loading of unauthorized or malicious code during the boot process. The vulnerability affects systems with Secure Boot enabled, primarily Windows devices.
💻 Affected Systems
- Microsoft Windows Secure Boot
📦 What is this software?
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 Secure Boot bypass allowing persistent malware installation at boot level, enabling rootkit deployment and system compromise that survives OS reinstallation.
Likely Case
Attackers bypass Secure Boot to load malicious drivers or boot components, potentially leading to credential theft, data exfiltration, or ransomware deployment.
If Mitigated
With proper controls, impact is limited to systems where attackers have physical access or administrative privileges to modify boot configuration.
🎯 Exploit Status
Exploitation requires administrative privileges or physical access to modify boot configuration. No public exploit code available as of current knowledge.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: March 2024 security updates (KB5035853 for Windows 11, KB5035855 for Windows 10, etc.)
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-26184
Restart Required: Yes
Instructions:
1. Apply March 2024 Windows security updates via Windows Update. 2. For enterprise: Deploy through WSUS or Microsoft Endpoint Configuration Manager. 3. Verify Secure Boot remains enabled after update. 4. Reboot system to complete installation.
🔧 Temporary Workarounds
Disable Secure Boot (NOT RECOMMENDED)
allDisabling Secure Boot eliminates the vulnerability but removes important security protection
Access UEFI/BIOS settings during boot
Navigate to Security or Boot options
Disable Secure Boot feature
🧯 If You Can't Patch
- Implement strict physical security controls to prevent unauthorized access to systems
- Enforce principle of least privilege and monitor for unauthorized boot configuration changes
🔍 How to Verify
Check if Vulnerable:
Check if March 2024 security updates are installed via 'systeminfo' command or Windows Update historyCheck Version:
wmic os get caption,version,buildnumberVerify Fix Applied:
Verify Secure Boot is enabled and functioning: Run 'Confirm-SecureBootUEFI' in PowerShell (returns True if enabled)📡 Detection & Monitoring
Log Indicators:
- Unexpected Secure Boot policy changes in System logs
- Boot configuration modifications in Event Viewer
- Failed Secure Boot validations
Network Indicators:
- Unusual outbound connections during boot process
- Network traffic from boot-level components
SIEM Query:
EventID=12 OR EventID=13 OR EventID=4672 with process containing 'boot' or 'secureboot'