CVE-2020-6147
📋 TL;DR
A heap overflow vulnerability in Pixar OpenUSD 20.05 allows attackers to execute arbitrary code or cause denial of service by parsing specially crafted compressed sections in binary USD files. This affects any application or service that processes USDC file format files, particularly in 3D graphics, animation, and visual effects pipelines.
💻 Affected Systems
- Pixar OpenUSD
📦 What is this software?
Ipados by Apple
Openusd by Pixar
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Application crash causing denial of service, potentially disrupting production pipelines.
If Mitigated
Limited to denial of service if memory protections like ASLR are effective.
🎯 Exploit Status
Exploit requires crafting malicious USDC files but no authentication needed to trigger parsing.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 20.08 or later
Vendor Advisory: https://github.com/PixarAnimationStudios/OpenUSD/releases
Restart Required: No
Instructions:
1. Upgrade OpenUSD to version 20.08 or later. 2. Recompile any applications using OpenUSD libraries. 3. Test with production USD files to ensure compatibility.
🔧 Temporary Workarounds
Disable USDC file processing
allBlock or reject USDC file format files at ingress points.
# Configure file upload filters to reject .usdc extensions
# Implement file type validation before processing
Use USD file format validation
allImplement strict validation of USD file structure before decompression.
# Add pre-parsing validation checks in application code
# Use checksums or signatures for trusted USD files
🧯 If You Can't Patch
- Implement network segmentation to isolate USD processing systems from critical infrastructure.
- Deploy application allowlisting to prevent execution of unauthorized processes from USD parsers.
🔍 How to Verify
Check if Vulnerable:
Check OpenUSD version: if version is exactly 20.05, system is vulnerable.Check Version:
usdcat --version 2>&1 | grep -i versionVerify Fix Applied:
Confirm OpenUSD version is 20.08 or later and test with known malicious USDC files.📡 Detection & Monitoring
Log Indicators:
- Application crashes in USD parsing components
- Memory access violation errors in logs
- Unexpected process termination during file import
Network Indicators:
- Unusual outbound connections from USD processing systems
- Large volumes of USD file transfers to untrusted sources
SIEM Query:
source="application.log" AND ("segmentation fault" OR "heap overflow" OR "usd")