CVE-2020-9940
📋 TL;DR
This vulnerability allows attackers to execute arbitrary code or crash applications by tricking users into opening malicious USD (Universal Scene Description) files. It affects Apple iOS, iPadOS, macOS, and tvOS users who process USD files through vulnerable applications.
💻 Affected Systems
- iOS
- iPadOS
- macOS
- tvOS
📦 What is this software?
Ipados by Apple
Tvos by Apple
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with the privileges of the user opening the malicious file, potentially leading to full system compromise.
Likely Case
Application crashes (denial of service) when processing specially crafted USD files, disrupting workflow.
If Mitigated
No impact if systems are patched or if USD file processing is restricted to trusted sources.
🎯 Exploit Status
Exploitation requires user interaction to open a malicious USD file. No public proof-of-concept has been disclosed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: iOS 13.6, iPadOS 13.6, macOS Catalina 10.15.6, tvOS 13.4.8
Vendor Advisory: https://support.apple.com/kb/HT211288
Restart Required: Yes
Instructions:
1. Open Settings app. 2. Go to General > Software Update. 3. Install the available update for your device. 4. Restart the device after installation.
🔧 Temporary Workarounds
Restrict USD file processing
allBlock or restrict the opening of USD files from untrusted sources.
🧯 If You Can't Patch
- Implement application whitelisting to prevent unauthorized applications from running.
- Educate users to avoid opening USD files from unknown or untrusted sources.
🔍 How to Verify
Check if Vulnerable:
Check the operating system version against the patched versions listed in the affected systems section.Check Version:
On macOS: sw_vers -productVersion. On iOS/iPadOS/tvOS: Settings > General > About > Version.Verify Fix Applied:
Verify that the operating system version matches or exceeds the patched versions: iOS 13.6+, iPadOS 13.6+, macOS Catalina 10.15.6+, tvOS 13.4.8+.📡 Detection & Monitoring
Log Indicators:
- Application crash logs related to USD file processing
- Unexpected process terminations when opening USD files
Network Indicators:
- Downloads of USD files from suspicious sources
- Network traffic patterns associated with exploit attempts
SIEM Query:
source="application.logs" AND (event="crash" OR event="termination") AND file_extension="usd"