CVE-2021-33161
📋 TL;DR
This vulnerability allows a privileged user on a system with affected Intel Ethernet hardware to potentially escalate privileges through improper input validation in manageability firmware. It affects systems using specific Intel Ethernet Adapters and Controller I225 with vulnerable firmware versions. Exploitation requires local access to the system.
💻 Affected Systems
- Intel Ethernet Adapters
- Intel Ethernet Controller I225
📦 What is this software?
Ethernet Adapter Complete Driver by Intel
Ethernet Controller I225 It Firmware by Intel
View all CVEs affecting Ethernet Controller I225 It Firmware →
⚠️ Risk & Real-World Impact
Worst Case
A privileged attacker could gain full system control, potentially installing persistent malware, accessing sensitive data, or disrupting network operations.
Likely Case
A malicious administrator or compromised privileged account could elevate privileges to gain deeper system access or bypass security controls.
If Mitigated
With proper access controls and monitoring, impact is limited to authorized administrative actions within expected boundaries.
🎯 Exploit Status
Exploitation requires privileged local access and knowledge of the vulnerability. No public exploit code is known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Updated firmware versions specified in Intel advisory
Vendor Advisory: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00756.html
Restart Required: Yes
Instructions:
1. Identify affected hardware using system inventory tools. 2. Download updated firmware from Intel's support site. 3. Follow Intel's firmware update instructions for your specific hardware. 4. Reboot system after firmware update.
🔧 Temporary Workarounds
Restrict Local Privileged Access
allLimit the number of users with local administrative privileges to reduce attack surface.
Monitor Privileged Account Activity
allImplement logging and monitoring for privileged account actions on affected systems.
🧯 If You Can't Patch
- Implement strict access controls to limit local privileged accounts
- Monitor systems for unusual privileged activity or firmware modification attempts
🔍 How to Verify
Check if Vulnerable:
Check system hardware inventory for Intel Ethernet Controller I225 or affected adapters, then check firmware version against Intel's advisory.Check Version:
Platform-specific commands vary. On Linux: 'lspci | grep -i ethernet', on Windows: Device Manager properties for network adapters.Verify Fix Applied:
Verify firmware version has been updated to patched version specified in Intel advisory.📡 Detection & Monitoring
Log Indicators:
- Unexpected firmware modification attempts
- Privileged account performing unusual network hardware operations
Network Indicators:
- Unusual network adapter configuration changes
SIEM Query:
Search for events related to firmware updates, privileged account network hardware modifications, or unexpected system privilege escalations.