CVE-2023-42867
📋 TL;DR
This vulnerability in GarageBand allows malicious applications to bypass entitlement and Team ID validation, potentially gaining root privileges on macOS systems. It affects macOS users running vulnerable versions of GarageBand. The issue could lead to complete system compromise if exploited.
💻 Affected Systems
- GarageBand
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with root-level access, allowing attackers to install persistent malware, steal sensitive data, or disable security controls.
Likely Case
Local privilege escalation where a malicious app gains elevated privileges to access protected system resources or user data.
If Mitigated
Limited impact if proper application sandboxing and least privilege principles are enforced, though root access would still be concerning.
🎯 Exploit Status
Exploitation requires creating a malicious application that can bypass entitlement checks. No public exploit code has been disclosed as of the advisory.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: GarageBand 10.4.9
Vendor Advisory: https://support.apple.com/en-us/120299
Restart Required: Yes
Instructions:
1. Open the App Store on macOS. 2. Click 'Updates' in the sidebar. 3. Find GarageBand and click 'Update'. 4. Restart your Mac after installation completes.
🔧 Temporary Workarounds
Uninstall GarageBand
allRemove GarageBand from affected systems if not needed
sudo rm -rf /Applications/GarageBand.app
Restrict Application Execution
allUse macOS Gatekeeper and application whitelisting to prevent unauthorized app execution
sudo spctl --master-enable
sudo spctl --enable --label "Developer ID"
🧯 If You Can't Patch
- Implement strict application control policies to prevent unauthorized app execution
- Monitor for unusual privilege escalation attempts using macOS security logs
🔍 How to Verify
Check if Vulnerable:
Check GarageBand version in About GarageBand menu or via: defaults read /Applications/GarageBand.app/Contents/Info.plist CFBundleShortVersionStringCheck Version:
defaults read /Applications/GarageBand.app/Contents/Info.plist CFBundleShortVersionStringVerify Fix Applied:
Verify GarageBand version is 10.4.9 or higher using the same command📡 Detection & Monitoring
Log Indicators:
- Unusual privilege escalation events in macOS system logs
- GarageBand process spawning with elevated privileges
Network Indicators:
- Not applicable - local privilege escalation
SIEM Query:
source="macos_system_logs" AND (process="GarageBand" AND privilege="root")