CVE-2023-42886
📋 TL;DR
This CVE-2023-42886 is an out-of-bounds read vulnerability in macOS that could allow a user to cause unexpected app termination or arbitrary code execution. It affects macOS Monterey, Ventura, and Sonoma before specific patch versions. Attackers could potentially exploit this to run malicious code on affected systems.
💻 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 →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 →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
Full system compromise with arbitrary code execution leading to data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Application crashes or denial of service, with potential for limited code execution in specific contexts.
If Mitigated
Minimal impact if systems are patched and proper application sandboxing is enforced.
🎯 Exploit Status
Exploitation requires user interaction or specific conditions. No public exploit code has been confirmed, but the vulnerability is serious enough that weaponization is possible.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: macOS Sonoma 14.2, macOS Ventura 13.6.3, macOS Monterey 12.7.2
Vendor Advisory: https://support.apple.com/en-us/HT214036
Restart Required: Yes
Instructions:
1. Open System Settings > General > Software Update. 2. Install available updates. 3. Restart when prompted.
🔧 Temporary Workarounds
Application Sandboxing Enforcement
allEnsure all applications run with appropriate sandboxing to limit potential damage from exploitation.
🧯 If You Can't Patch
- Isolate affected systems from untrusted networks and users
- Implement strict application control policies to limit which applications can run
🔍 How to Verify
Check if Vulnerable:
Check macOS version in System Settings > General > About. If version is Monterey <12.7.2, Ventura <13.6.3, or Sonoma <14.2, system is vulnerable.Check Version:
sw_versVerify Fix Applied:
Verify macOS version is 12.7.2 or higher for Monterey, 13.6.3 or higher for Ventura, or 14.2 or higher for Sonoma.📡 Detection & Monitoring
Log Indicators:
- Unexpected application crashes, especially in system processes
- Memory access violation logs in Console.app
Network Indicators:
- Unusual outbound connections following application crashes
SIEM Query:
source="macos" AND (event_type="crash" OR error="EXC_BAD_ACCESS")🔗 References
- http://seclists.org/fulldisclosure/2023/Dec/10
- http://seclists.org/fulldisclosure/2023/Dec/11
- http://seclists.org/fulldisclosure/2023/Dec/9
- https://support.apple.com/en-us/HT214036
- https://support.apple.com/en-us/HT214037
- https://support.apple.com/en-us/HT214038
- http://seclists.org/fulldisclosure/2023/Dec/10
- http://seclists.org/fulldisclosure/2023/Dec/11
- http://seclists.org/fulldisclosure/2023/Dec/9
- https://support.apple.com/en-us/HT214036
- https://support.apple.com/en-us/HT214037
- https://support.apple.com/en-us/HT214038
- https://support.apple.com/kb/HT214036
- https://support.apple.com/kb/HT214037
- https://support.apple.com/kb/HT214038
