CVE-2024-36434
📋 TL;DR
An SMM callout vulnerability in Supermicro X11DPH motherboards allows attackers with local access to execute arbitrary code in System Management Mode (SMM), a highly privileged CPU mode. This affects X11DPH-T, X11DPH-Tq, and X11DPH-i motherboards with BIOS firmware before version 4.4. Attackers could potentially bypass security controls and gain persistent access to the system.
💻 Affected Systems
- Supermicro X11DPH-T
- Supermicro X11DPH-Tq
- Supermicro X11DPH-i
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with persistent firmware-level malware that survives OS reinstallation and disk replacement, allowing attackers to bypass all security controls and maintain long-term access.
Likely Case
Local privilege escalation to SMM level, enabling attackers to bypass OS security controls, install persistent backdoors, and potentially access sensitive data.
If Mitigated
Limited impact if proper access controls prevent local attacker access and BIOS-level security features are enabled.
🎯 Exploit Status
Requires local access and knowledge of SMM exploitation techniques. No public exploit code available at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: BIOS firmware version 4.4 or later
Vendor Advisory: https://www.supermicro.com/en/support/security_BIOS_Jul_2024
Restart Required: Yes
Instructions:
1. Download BIOS firmware version 4.4 or later from Supermicro support site. 2. Follow Supermicro's BIOS update procedure for your specific motherboard model. 3. Reboot the system after flashing. 4. Verify BIOS version in system setup.
🔧 Temporary Workarounds
Restrict Physical Access
allLimit physical access to affected systems to authorized personnel only
Disable Unnecessary Console Access
allDisable IPMI, KVM, and other remote management interfaces if not required
🧯 If You Can't Patch
- Implement strict physical security controls to prevent unauthorized local access
- Monitor for suspicious BIOS/UEFI modification attempts and system behavior anomalies
🔍 How to Verify
Check if Vulnerable:
Check BIOS version in system setup (usually F2 or DEL during boot) or use dmidecode command on Linux: sudo dmidecode -t bios | grep VersionCheck Version:
sudo dmidecode -t bios | grep VersionVerify Fix Applied:
Verify BIOS version is 4.4 or higher using same methods as checking vulnerability📡 Detection & Monitoring
Log Indicators:
- Unexpected BIOS/UEFI firmware modification events
- Suspicious SMM-related activity in system logs
- Unauthorized physical access logs
Network Indicators:
- Unusual IPMI/KVM traffic patterns if remote management is enabled
SIEM Query:
Search for BIOS/UEFI modification events or unauthorized physical access attempts in security logs