CVE-2020-8731
📋 TL;DR
This vulnerability in Intel server hardware allows authenticated local users to escalate privileges by exploiting incorrect file system permissions. It affects Intel Server Boards, Server Systems, and Compute Modules with BIOS/UEFI firmware versions before 1.59. Attackers with local access can gain elevated system privileges.
💻 Affected Systems
- Intel Server Boards
- Intel Server Systems
- Intel Compute Modules
📦 What is this software?
Compute Module Hns2600bp Firmware by Intel
Compute Module Hns2600kp Firmware by Intel
Compute Module Hns2600tp Firmware by Intel
⚠️ Risk & Real-World Impact
Worst Case
An authenticated attacker gains full administrative control over the affected server, potentially compromising all data, services, and connected systems.
Likely Case
Malicious insiders or compromised accounts escalate privileges to install persistent malware, exfiltrate sensitive data, or pivot to other systems.
If Mitigated
With proper access controls and monitoring, exploitation would be detected and contained before significant damage occurs.
🎯 Exploit Status
Exploitation requires local authenticated access but the technical details suggest straightforward privilege escalation once access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 1.59 or later
Vendor Advisory: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00384.html
Restart Required: Yes
Instructions:
1. Download BIOS/UEFI firmware update 1.59 or later from Intel support site. 2. Follow Intel's firmware update instructions for your specific server model. 3. Reboot the system to apply the firmware update.
🔧 Temporary Workarounds
Restrict Local Access
allLimit physical and remote local access to affected servers to trusted administrators only.
Enhanced Monitoring
allImplement strict monitoring of privilege escalation attempts and file permission changes.
🧯 If You Can't Patch
- Isolate affected systems in separate network segments with strict access controls
- Implement multi-factor authentication and least privilege access for all local accounts
🔍 How to Verify
Check if Vulnerable:
Check BIOS/UEFI firmware version in system setup (F2 during boot) or using Intel's System Configuration Utility.Check Version:
For Linux: dmidecode -t bios | grep Version
For Windows: wmic bios get smbiosbiosversionVerify Fix Applied:
Verify BIOS/UEFI firmware version shows 1.59 or later in system information.📡 Detection & Monitoring
Log Indicators:
- Unexpected privilege escalation events
- Unauthorized file permission changes in system directories
- BIOS/UEFI configuration changes
Network Indicators:
- Unusual outbound connections from server management interfaces
SIEM Query:
EventID=4672 OR EventID=4688 (Windows) OR auth.*privilege.*escalation (Linux audit logs)