CVE-2025-47827
📋 TL;DR
This vulnerability allows attackers to bypass Secure Boot protection in IGEL OS by exploiting improper cryptographic signature verification in the igel-flash-driver module. This enables mounting of malicious root filesystems from unverified SquashFS images. Organizations using IGEL OS versions before 11 are affected.
💻 Affected Systems
- IGEL OS
📦 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 1809 by Microsoft
Windows 10 21h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 11 22h2 by Microsoft
Windows 11 23h2 by Microsoft
Windows 11 24h2 by Microsoft
Windows 11 25h2 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing persistent malware installation, data theft, and lateral movement within the network.
Likely Case
Local privilege escalation leading to unauthorized system access and potential data exfiltration.
If Mitigated
Limited impact if proper network segmentation and endpoint protection are implemented.
🎯 Exploit Status
Exploitation requires local access to the system. Public proof-of-concept code is available on GitHub.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: IGEL OS 11 and later
Vendor Advisory: https://www.igel.com/security-advisory/
Restart Required: Yes
Instructions:
1. Backup system configuration. 2. Download IGEL OS 11 or later from official portal. 3. Deploy update through IGEL Management Interface or USB. 4. Verify Secure Boot functionality post-update.
🔧 Temporary Workarounds
Disable vulnerable module
linuxTemporarily disable the igel-flash-driver module to prevent exploitation
modprobe -r igel-flash-driver
Restrict physical access
allImplement physical security controls to prevent local exploitation
🧯 If You Can't Patch
- Implement strict physical access controls to vulnerable devices
- Deploy endpoint detection and response (EDR) solutions to monitor for suspicious filesystem activity
🔍 How to Verify
Check if Vulnerable:
Check IGEL OS version with 'cat /etc/os-release' and verify if version is below 11Check Version:
cat /etc/os-release | grep VERSION_IDVerify Fix Applied:
Verify OS version is 11 or higher and check that Secure Boot is properly enforcing signatures📡 Detection & Monitoring
Log Indicators:
- Unexpected module loading of igel-flash-driver
- SquashFS mount attempts from unusual locations
- Secure Boot verification failures
Network Indicators:
- Unusual outbound connections from IGEL devices following local access events
SIEM Query:
source="igel-os" AND (event="module_load" AND module="igel-flash-driver") OR (event="mount" AND filesystem="squashfs")