CVE-2025-33043
📋 TL;DR
This CVE describes an improper input validation vulnerability in AMI APTIOV BIOS firmware. An attacker with local access can exploit this to potentially modify BIOS settings or firmware, compromising system integrity. This affects systems using vulnerable AMI APTIOV BIOS versions.
💻 Affected Systems
- AMI APTIOV BIOS
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker could persistently compromise BIOS firmware, potentially installing undetectable malware or bricking the system.
Likely Case
An attacker with local access could modify BIOS settings to weaken security controls or enable other attacks.
If Mitigated
With proper access controls and BIOS write protection enabled, impact is limited to temporary configuration changes.
🎯 Exploit Status
Exploitation requires local access and knowledge of BIOS interaction mechanisms. No public exploit code is currently available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check with system manufacturer for BIOS/UEFI firmware updates
Vendor Advisory: https://go.ami.com/hubfs/Security%20Advisories/2025/AMI-SA-2025005.pdf
Restart Required: Yes
Instructions:
1. Contact your system manufacturer for BIOS/UEFI firmware updates. 2. Download the updated firmware from manufacturer's support site. 3. Follow manufacturer's instructions to flash the BIOS/UEFI firmware. 4. Restart the system to apply changes.
🔧 Temporary Workarounds
Enable BIOS Write Protection
allEnable BIOS write protection features if available to prevent unauthorized firmware modifications
Restrict Physical Access
allImplement physical security controls to prevent unauthorized local access to vulnerable systems
🧯 If You Can't Patch
- Implement strict physical access controls to vulnerable systems
- Enable BIOS/UEFI password protection and secure boot features
🔍 How to Verify
Check if Vulnerable:
Check BIOS/UEFI firmware version against manufacturer's security advisories. Use manufacturer-specific tools or check in BIOS setup.Check Version:
Manufacturer-specific (e.g., wmic bios get smbiosbiosversion on Windows, dmidecode -t bios on Linux)Verify Fix Applied:
Verify BIOS/UEFI firmware version has been updated to a version listed as patched by the manufacturer.📡 Detection & Monitoring
Log Indicators:
- Unexpected BIOS/UEFI firmware update attempts
- BIOS configuration changes outside maintenance windows
Network Indicators:
- No network indicators - this is a local attack
SIEM Query:
Search for BIOS/UEFI firmware update events or configuration changes in system logs