CVE-2021-0154
📋 TL;DR
This vulnerability allows a privileged user with local access to potentially escalate privileges through improper input validation in BIOS firmware on certain Intel processors. It affects systems running vulnerable Intel processor firmware versions. Attackers could gain higher-level system access than originally authorized.
💻 Affected Systems
- Intel Processors with vulnerable BIOS firmware
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with administrative/root access, allowing installation of persistent malware, data theft, or system destruction.
Likely Case
Privilege escalation from a lower-privileged local account to higher system privileges, enabling lateral movement or persistence establishment.
If Mitigated
Limited impact due to proper access controls, monitoring, and network segmentation preventing local access by unauthorized users.
🎯 Exploit Status
Requires privileged local access and knowledge of the vulnerability. No public exploit code has been disclosed as of the advisory date.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: BIOS firmware updates provided by system manufacturers/OEMs
Vendor Advisory: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00601.html
Restart Required: Yes
Instructions:
1. Check system manufacturer's website for BIOS/UEFI firmware updates. 2. Download the appropriate firmware update for your specific system model. 3. Follow manufacturer's instructions to apply the firmware update. 4. Reboot the system as required by the update process.
🔧 Temporary Workarounds
Restrict Local Access
allLimit physical and remote local access to systems to only authorized, trusted users.
Principle of Least Privilege
allEnsure users only have the minimum privileges necessary for their roles to limit impact if credentials are compromised.
🧯 If You Can't Patch
- Implement strict access controls to limit who has local access to affected systems
- Monitor for unusual privilege escalation attempts and BIOS/UEFI modification activities
🔍 How to Verify
Check if Vulnerable:
Check BIOS/UEFI firmware version against manufacturer's patched versions. Use system information tools or manufacturer utilities.Check Version:
On Windows: wmic bios get smbiosbiosversion
On Linux: dmidecode -t bios
Check manufacturer-specific tools for exact versionVerify Fix Applied:
Verify BIOS/UEFI firmware version has been updated to a version listed as patched by the manufacturer.📡 Detection & Monitoring
Log Indicators:
- BIOS/UEFI firmware modification logs
- Unexpected privilege escalation events
- Failed authentication attempts followed by successful privileged access
Network Indicators:
- Unusual outbound connections from systems after local access events
SIEM Query:
EventID=4672 (Special privileges assigned) OR BIOS modification events correlated with user login events