CVE-2021-34375
📋 TL;DR
CVE-2021-34375 is a stack cookie randomization vulnerability in NVIDIA Trusty trusted applications (TAs) that could allow stack-based buffer overflows. This affects devices using NVIDIA Trusty secure execution environment, potentially leading to privilege escalation, information disclosure, or denial of service. The vulnerability impacts all trusted applications running on affected NVIDIA platforms.
💻 Affected Systems
- NVIDIA Trusty Trusted Execution Environment (TEE)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full compromise of the Trusty secure execution environment allowing attackers to execute arbitrary code with elevated privileges, access sensitive data in secure memory, and potentially compromise the entire device security model.
Likely Case
Denial of service through trusted application crashes or limited information disclosure from secure memory regions, potentially enabling further attacks against the secure execution environment.
If Mitigated
Limited impact with proper isolation between trusted applications and the normal operating system, though some information leakage or DoS may still occur.
🎯 Exploit Status
Exploitation requires compromising a trusted application first, then leveraging the lack of stack cookie randomization to achieve buffer overflow within the secure execution environment.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Security updates provided by NVIDIA for affected platforms
Vendor Advisory: https://nvidia.custhelp.com/app/answers/detail/a_id/5205
Restart Required: Yes
Instructions:
1. Check NVIDIA security advisory for your specific platform. 2. Apply the provided firmware/software updates from NVIDIA. 3. Reboot the device to load updated Trusty components. 4. Verify the update was successful.
🔧 Temporary Workarounds
Disable unnecessary trusted applications
allReduce attack surface by disabling non-essential trusted applications in the Trusty environment
Platform-specific configuration changes required
🧯 If You Can't Patch
- Implement strict access controls to limit who can interact with trusted applications
- Monitor for abnormal behavior in the secure execution environment and implement application whitelisting
🔍 How to Verify
Check if Vulnerable:
Check Trusty version and compare against NVIDIA's patched versions in the security advisoryCheck Version:
Platform-specific commands vary; consult device documentation for Trusty version checkingVerify Fix Applied:
Verify Trusty component versions match or exceed the patched versions specified by NVIDIA📡 Detection & Monitoring
Log Indicators:
- Trusted application crashes
- Secure environment exceptions
- Unexpected Trusty TEE restarts
Network Indicators:
- None - this is a local execution vulnerability
SIEM Query:
Search for Trusty/secure environment crash logs or abnormal termination of trusted applications