CVE-2023-42876
📋 TL;DR
A memory corruption vulnerability in macOS allows processing malicious files to cause denial-of-service or memory disclosure. This affects macOS users who open untrusted files, particularly those using vulnerable versions before Sonoma 14.
💻 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
Arbitrary code execution leading to full system compromise if memory disclosure enables further exploitation.
Likely Case
Application crash or denial-of-service from malformed file processing, with potential limited memory leakage.
If Mitigated
Minimal impact with proper file handling controls and updated systems.
🎯 Exploit Status
Exploitation requires user interaction to open malicious files. No public exploit code is currently available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: macOS Sonoma 14
Vendor Advisory: https://support.apple.com/en-us/HT213940
Restart Required: Yes
Instructions:
1. Open System Settings > General > Software Update. 2. Install macOS Sonoma 14 update. 3. Restart system when prompted.
🔧 Temporary Workarounds
Restrict file processing
allLimit processing of untrusted files and use application sandboxing where possible.
🧯 If You Can't Patch
- Implement application allowlisting to restrict which applications can open files
- Use network segmentation to isolate vulnerable systems and monitor for suspicious file activity
🔍 How to Verify
Check if Vulnerable:
Check macOS version in System Settings > General > About. If version is earlier than Sonoma 14, system is vulnerable.Check Version:
sw_versVerify Fix Applied:
Verify macOS version shows Sonoma 14 or later in System Settings > General > About.📡 Detection & Monitoring
Log Indicators:
- Application crashes related to file processing
- Unexpected memory access errors in system logs
Network Indicators:
- Unusual file downloads from untrusted sources
SIEM Query:
source="macos_system_logs" AND (event="crash" OR event="memory_error") AND process="*file*"