CVE-2020-12307
📋 TL;DR
This vulnerability in Intel High Definition Audio drivers allows authenticated local users to escalate privileges by exploiting improper permissions. It affects systems with vulnerable Intel audio drivers installed, primarily Windows machines with Intel hardware. Attackers could gain SYSTEM-level access from a standard user account.
💻 Affected Systems
- Intel High Definition Audio drivers
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with SYSTEM privileges, allowing installation of persistent malware, credential theft, and complete control over the affected system.
Likely Case
Local privilege escalation enabling attackers to bypass security controls, install additional malware, or access restricted system resources.
If Mitigated
Limited impact if proper access controls and least privilege principles are enforced, though the vulnerability still provides a foothold for lateral movement.
🎯 Exploit Status
Requires authenticated local access. Exploitation is relatively straightforward once initial access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 9.21.00.4561 or later
Vendor Advisory: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00409
Restart Required: Yes
Instructions:
1. Download updated Intel HD Audio driver from Intel website or Windows Update. 2. Install the driver update. 3. Restart the system to complete installation.
🔧 Temporary Workarounds
Restrict local user access
windowsLimit local user accounts and enforce least privilege to reduce attack surface
Disable vulnerable driver
windowsTemporarily disable Intel HD Audio driver if not essential
devmgmt.msc -> Sound, video and game controllers -> Right-click Intel HD Audio -> Disable device
🧯 If You Can't Patch
- Implement strict access controls and limit local administrative privileges
- Monitor for privilege escalation attempts and unusual driver activity
🔍 How to Verify
Check if Vulnerable:
Check driver version in Device Manager under Sound, video and game controllers -> Intel High Definition Audio -> Driver tabCheck Version:
wmic sounddev get name, driverversionVerify Fix Applied:
Verify driver version is 9.21.00.4561 or higher in Device Manager📡 Detection & Monitoring
Log Indicators:
- Windows Event Logs showing privilege escalation attempts
- Driver loading events for Intel HD Audio driver
Network Indicators:
- No direct network indicators - local privilege escalation
SIEM Query:
EventID=4688 AND ProcessName LIKE '%audio%' AND NewProcessName='cmd.exe' OR 'powershell.exe'