CVE-2020-6155
📋 TL;DR
A heap overflow vulnerability in Pixar OpenUSD 20.05 allows remote code execution when parsing specially crafted binary USD files. Attackers can exploit this by tricking users into opening malicious files. Anyone using OpenUSD 20.05 to process USD files is affected.
💻 Affected Systems
- Pixar OpenUSD
📦 What is this software?
Openusd by Pixar
⚠️ Risk & Real-World Impact
Worst Case
Full remote code execution with the privileges of the user running the vulnerable software, potentially leading to complete system compromise.
Likely Case
Application crash or denial of service, with potential for code execution if exploit is successful.
If Mitigated
Limited to denial of service if exploit fails or is blocked by security controls.
🎯 Exploit Status
Proof of concept available in Talos advisory. Exploitation requires user to open malicious file.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 20.05 (20.08 or later)
Vendor Advisory: https://github.com/PixarAnimationStudios/USD/releases
Restart Required: No
Instructions:
1. Update OpenUSD to version 20.08 or later. 2. Recompile any applications using OpenUSD libraries. 3. Replace any vulnerable USD files with patched versions.
🔧 Temporary Workarounds
Disable binary USD file processing
allConfigure applications to only accept ASCII USD files instead of binary USD files
Application-specific configuration required
File type filtering
allBlock or quarantine .usd/.usda/.usdc files at network boundaries
firewall or email filter configuration required
🧯 If You Can't Patch
- Implement strict file validation for all USD files before processing
- Run OpenUSD in sandboxed/isolated environments with minimal privileges
🔍 How to Verify
Check if Vulnerable:
Check OpenUSD version: usdview --version or examine linked libraries in applicationsCheck Version:
usdview --version | grep 'USD'Verify Fix Applied:
Confirm version is 20.08 or later and test with known malicious USD files📡 Detection & Monitoring
Log Indicators:
- Application crashes when processing USD files
- Memory access violation errors in application logs
Network Indicators:
- Unexpected USD file downloads from untrusted sources
- Large binary file transfers to USD processing systems
SIEM Query:
source="application.log" AND ("segmentation fault" OR "heap overflow" OR "access violation") AND "usd"