CVE-2024-55567
📋 TL;DR
This vulnerability allows attackers to write arbitrary memory inside SMRAM and execute arbitrary code at SMM level due to improper input validation in UsbCoreDxe. It affects systems running Insyde InsydeH2O kernel versions 5.4 before 05.47.01, 5.5 before 05.55.01, 5.6 before 05.62.01, and 5.7 before 05.71.01. This is a System Management Mode vulnerability that gives attackers high-privilege access.
💻 Affected Systems
- Insyde InsydeH2O kernel
📦 What is this software?
Insydeh2o by Insyde
Insydeh2o by Insyde
Insydeh2o by Insyde
Insydeh2o by Insyde
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with SMM-level code execution, allowing attackers to bypass all security controls, install persistent firmware-level malware, and gain full control over the system.
Likely Case
Privilege escalation to SMM level allowing attackers to bypass operating system security controls, install rootkits, and maintain persistence even after OS reinstallation.
If Mitigated
Limited impact if proper SMM protections are in place and the system is isolated, though the vulnerability still provides a significant attack surface.
🎯 Exploit Status
Exploitation requires local access or ability to execute code on the system. SMM vulnerabilities typically require sophisticated exploitation techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.4: 05.47.01+, 5.5: 05.55.01+, 5.6: 05.62.01+, 5.7: 05.71.01+
Vendor Advisory: https://www.insyde.com/security-pledge/sa-2024018/
Restart Required: Yes
Instructions:
1. Contact your device manufacturer for updated firmware. 2. Download the appropriate firmware update. 3. Apply the firmware update following manufacturer instructions. 4. Reboot the system to complete the update.
🧯 If You Can't Patch
- Restrict physical and administrative access to affected systems
- Implement strict endpoint security controls and monitoring for suspicious SMM activity
🔍 How to Verify
Check if Vulnerable:
Check firmware version in UEFI/BIOS settings or using manufacturer-specific tools. Compare against affected version ranges.Check Version:
Manufacturer-specific commands vary. Typically check in UEFI/BIOS settings or use 'dmidecode' on Linux or manufacturer utilities on Windows.Verify Fix Applied:
Verify firmware version has been updated to patched versions: 5.4: 05.47.01+, 5.5: 05.55.01+, 5.6: 05.62.01+, 5.7: 05.71.01+📡 Detection & Monitoring
Log Indicators:
- Unexpected firmware update attempts
- SMM-related errors or warnings in system logs
- Unusual BIOS/UEFI configuration changes
Network Indicators:
- Unusual outbound connections from firmware management interfaces
SIEM Query:
Search for firmware update events or SMM-related errors in system logs. Monitor for unexpected BIOS/UEFI configuration changes.