CVE-2024-40842
📋 TL;DR
This macOS vulnerability allows applications to access sensitive user data due to improper environment variable validation. It affects macOS systems before Sequoia 15. The issue enables unauthorized data access through malicious or compromised applications.
💻 Affected Systems
- macOS
📦 What is this software?
Macos by Apple
macOS is Apple's desktop and laptop operating system powering Mac computers used by millions of professionals, developers, creative professionals, and enterprise users worldwide. Built on a Unix foundation with the Darwin kernel and modern Cocoa frameworks, macOS delivers a seamless ecosystem integr...
Learn more about Macos →⚠️ Risk & Real-World Impact
Worst Case
Malicious app could access passwords, encryption keys, authentication tokens, or other sensitive user data stored in environment variables, potentially leading to credential theft or system compromise.
Likely Case
Compromised legitimate applications or malware could harvest sensitive environment data, enabling lateral movement or privilege escalation within the user context.
If Mitigated
With proper application sandboxing and least privilege principles, impact is limited to data accessible within the compromised application's context.
🎯 Exploit Status
Exploitation requires a malicious or compromised application to be installed and executed on the target system. No public exploit code has been disclosed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: macOS Sequoia 15
Vendor Advisory: https://support.apple.com/en-us/121238
Restart Required: Yes
Instructions:
1. Open System Settings 2. Click General 3. Click Software Update 4. Install macOS Sequoia 15 update 5. Restart when prompted
🔧 Temporary Workarounds
Restrict Application Installation
allOnly install applications from trusted sources and the Mac App Store
Monitor Environment Variables
linuxRegularly audit environment variables for sensitive data
printenv | grep -i 'pass\|key\|token\|secret'
🧯 If You Can't Patch
- Implement strict application allowlisting to prevent unauthorized app execution
- Use application sandboxing and containerization to limit data exposure
🔍 How to Verify
Check if Vulnerable:
Check macOS version: if version is earlier than 15.0, system is vulnerableCheck Version:
sw_versVerify Fix Applied:
Verify macOS version is 15.0 or later and check Apple security updates are applied📡 Detection & Monitoring
Log Indicators:
- Unusual application behavior accessing environment variables
- Suspicious process spawning with environment inspection
Network Indicators:
- Unexpected outbound connections following environment variable access
SIEM Query:
process where (process.name contains "printenv" or process.args contains "env") and not (user.name contains "root" or process.parent.name contains "launchd")