CVE-2023-20587
📋 TL;DR
This vulnerability allows attackers with physical or administrative access to bypass System Management Mode (SMM) protections and access the SPI flash memory. This could enable arbitrary code execution at the firmware level, affecting AMD processors with vulnerable SMM implementations.
💻 Affected Systems
- AMD processors with vulnerable SMM implementations
⚠️ 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.
Likely Case
Local attacker with administrative privileges could install persistent backdoors or extract sensitive firmware data.
If Mitigated
Attack limited to administrative users with physical access, with secure boot and firmware protections preventing full exploitation.
🎯 Exploit Status
Exploitation requires deep knowledge of SMM and firmware internals, plus administrative or physical access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to AMD advisory for specific BIOS/UEFI firmware updates
Vendor Advisory: https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-7009
Restart Required: Yes
Instructions:
1. Check AMD advisory for affected processor models. 2. Contact system/motherboard manufacturer for BIOS/UEFI updates. 3. Apply firmware update following manufacturer instructions. 4. Reboot system to activate new firmware.
🔧 Temporary Workarounds
Restrict Physical Access
allLimit physical access to systems to prevent local exploitation
Minimize Administrative Privileges
allReduce number of users with administrative access to limit attack surface
🧯 If You Can't Patch
- Implement strict physical security controls and access monitoring
- Use hardware security modules or TPM-based attestation to detect firmware tampering
🔍 How to Verify
Check if Vulnerable:
Check processor model and BIOS/UEFI version against AMD advisory listCheck Version:
On Windows: wmic bios get smbiosbiosversion. On Linux: sudo dmidecode -t biosVerify Fix Applied:
Verify BIOS/UEFI version matches patched version from manufacturer📡 Detection & Monitoring
Log Indicators:
- Unexpected BIOS/UEFI update attempts
- SMM-related errors in system logs
- Failed secure boot events
Network Indicators:
- Unusual outbound connections from firmware management interfaces
SIEM Query:
EventID=12 OR EventID=13 (BIOS/UEFI events) | where suspicious_patterns_detected