CVE-2022-26343
📋 TL;DR
This vulnerability allows a privileged user with local access to bypass BIOS firmware access controls on certain Intel processors, potentially enabling privilege escalation. It affects systems running vulnerable Intel processor BIOS firmware versions. The attacker must already have administrative or privileged access to the system.
💻 Affected Systems
- Intel processors with vulnerable BIOS firmware
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker with local privileged access could gain persistent control over the BIOS/UEFI firmware, potentially installing undetectable malware, bypassing secure boot, and maintaining persistence across operating system reinstalls.
Likely Case
A malicious insider or compromised administrator account could escalate privileges to firmware level, allowing them to bypass security controls, install rootkits, or maintain persistence on critical systems.
If Mitigated
With proper access controls and least privilege principles, the attack surface is reduced, though the vulnerability still exists in the firmware itself.
🎯 Exploit Status
Exploitation requires local privileged access and knowledge of BIOS/UEFI exploitation techniques. No public exploit code is known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: BIOS/UEFI firmware updates provided by system manufacturers
Vendor Advisory: http://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00717.html
Restart Required: Yes
Instructions:
1. Check Intel advisory for affected processor models. 2. Contact your system manufacturer for BIOS/UEFI firmware updates. 3. Download and apply the firmware update following manufacturer instructions. 4. Reboot the system to complete the update.
🔧 Temporary Workarounds
Restrict physical and administrative access
allLimit physical access to systems and implement strict least privilege for administrative accounts
Enable secure boot and TPM
allConfigure secure boot and Trusted Platform Module to detect unauthorized firmware modifications
🧯 If You Can't Patch
- Implement strict access controls and monitor privileged user activities
- Isolate affected systems in secure network segments and limit their use for critical functions
🔍 How to Verify
Check if Vulnerable:
Check system BIOS/UEFI firmware version against manufacturer's patched versions. Use manufacturer-specific tools or commands like 'dmidecode' on Linux or 'wmic bios get smbiosbiosversion' on Windows.Check Version:
Linux: dmidecode -s bios-version | Windows: wmic bios get smbiosbiosversionVerify Fix Applied:
Verify BIOS/UEFI firmware version matches or exceeds the patched version from manufacturer. Check that secure boot is enabled and functioning.📡 Detection & Monitoring
Log Indicators:
- Unexpected BIOS/UEFI firmware modification events
- Privileged user accessing BIOS/UEFI settings outside maintenance windows
- Secure boot violations or TPM attestation failures
Network Indicators:
- Unusual outbound connections from systems during BIOS update processes
- Network traffic to firmware update servers outside scheduled maintenance
SIEM Query:
source="bios_logs" AND (event_type="firmware_modification" OR event_type="secure_boot_violation")