CVE-2023-40404
📋 TL;DR
This CVE describes a use-after-free vulnerability in macOS that allows an application to execute arbitrary code with kernel privileges. Attackers could gain complete control over affected systems. All macOS systems before Sonoma 14.1 are affected.
💻 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
Complete system compromise with kernel-level persistence, data theft, and backdoor installation
Likely Case
Local privilege escalation allowing attackers to bypass security controls and install malware
If Mitigated
Limited impact with proper application sandboxing and least privilege principles
🎯 Exploit Status
Requires local application execution; no public exploit code available
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: macOS Sonoma 14.1
Vendor Advisory: https://support.apple.com/en-us/HT213984
Restart Required: Yes
Instructions:
1. Open System Settings 2. Click General 3. Click Software Update 4. Install macOS Sonoma 14.1 or later 5. Restart when prompted
🔧 Temporary Workarounds
Application Restriction
macosRestrict execution of untrusted applications using macOS Gatekeeper and application whitelisting
sudo spctl --master-enable
sudo spctl --enable --label "Developer ID"
🧯 If You Can't Patch
- Implement strict application control policies to prevent execution of untrusted software
- Use endpoint detection and response (EDR) solutions to monitor for privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check macOS version: if earlier than 14.1, system is vulnerableCheck Version:
sw_versVerify Fix Applied:
Verify macOS version is 14.1 or later after update📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- Unexpected privilege escalation in audit logs
- Suspicious process creation with elevated privileges
Network Indicators:
- Unusual outbound connections from system processes
SIEM Query:
process where parent_process_name != "kernel_task" and integrity_level changed