CVE-2021-23201
📋 TL;DR
This vulnerability in NVIDIA GPU and Tegra hardware allows an attacker with elevated privileges to generate and load malicious microcode on an internal microcontroller, potentially leading to information disclosure, data corruption, or denial of service. It affects systems using vulnerable NVIDIA hardware, particularly those where attackers have already gained privileged access.
💻 Affected Systems
- NVIDIA GPU hardware
- NVIDIA Tegra hardware
📦 What is this software?
Shield Tv by Nvidia
Tesla M10 by Nvidia
Tesla M4 by Nvidia
Tesla M40 by Nvidia
Tesla M6 by Nvidia
Tesla M60 by Nvidia
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise, including permanent data corruption, denial of service, or unauthorized access to sensitive information stored on or processed by the GPU/Tegra hardware.
Likely Case
Local attackers with elevated privileges exploiting the vulnerability to cause data corruption or denial of service, disrupting GPU/Tegra functionality in targeted systems.
If Mitigated
Minimal impact if systems are patched and access controls limit privileged user accounts, reducing the attack surface to trusted insiders only.
🎯 Exploit Status
No public exploits known; exploitation likely limited to sophisticated attackers with insider access or compromised systems.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check NVIDIA's security bulletin for specific firmware or driver updates; no single version listed in the provided references.
Vendor Advisory: https://nvidia.custhelp.com/app/answers/detail/a_id/5263
Restart Required: Yes
Instructions:
1. Review NVIDIA's security advisory for affected products. 2. Download and apply the latest firmware or driver updates from NVIDIA's official website. 3. Reboot the system to ensure changes take effect.
🔧 Temporary Workarounds
Restrict Privileged Access
allLimit the number of users with elevated privileges to reduce the attack surface for local exploitation.
Use OS-specific tools (e.g., sudoers file on Linux, User Account Control on Windows) to manage admin rights.
🧯 If You Can't Patch
- Isolate affected systems in segmented networks to limit potential lateral movement by attackers.
- Monitor for unusual activity or privilege escalation attempts on systems with vulnerable hardware.
🔍 How to Verify
Check if Vulnerable:
Check the NVIDIA GPU or Tegra firmware version against the patched versions listed in NVIDIA's security advisory.Check Version:
On Linux: 'nvidia-smi' for GPU info; on Windows: Check Device Manager or NVIDIA Control Panel for driver details.Verify Fix Applied:
Confirm that the firmware or driver version has been updated to a patched release as specified by NVIDIA.📡 Detection & Monitoring
Log Indicators:
- Unusual privilege escalation logs
- Failed or unauthorized firmware update attempts
Network Indicators:
- Anomalous outbound traffic from systems with NVIDIA hardware, though exploitation is primarily local.
SIEM Query:
Example: search for events where user privilege changes coincide with access to hardware management tools on systems with NVIDIA GPUs/Tegra.