CVE-2023-27953
📋 TL;DR
This is a critical memory corruption vulnerability in macOS kernel that allows remote attackers to cause system crashes or corrupt kernel memory. It affects macOS Ventura, Monterey, and Big Sur systems. Attackers can potentially exploit this without authentication to achieve remote code execution or denial of service.
💻 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
Remote code execution with kernel privileges leading to complete system compromise, data theft, and persistent backdoor installation.
Likely Case
System crashes (kernel panics) causing denial of service and potential data loss from unsaved work.
If Mitigated
Limited to denial of service if exploit attempts are detected and blocked by security controls.
🎯 Exploit Status
Apple has addressed the issue, but exploitation details are not publicly disclosed. The CWE-787 (Out-of-bounds Write) suggests memory corruption that could be leveraged for code execution.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: macOS Ventura 13.3, macOS Monterey 12.6.4, macOS Big Sur 11.7.5
Vendor Advisory: https://support.apple.com/en-us/HT213670
Restart Required: Yes
Instructions:
1. Open System Settings > General > Software Update. 2. Install available updates. 3. Restart when prompted. For managed environments, use MDM tools to deploy updates.
🔧 Temporary Workarounds
Network segmentation
allIsolate vulnerable macOS systems from untrusted networks to reduce attack surface
Firewall restrictions
macOSBlock unnecessary inbound network traffic to macOS systems
sudo /usr/libexec/ApplicationFirewall/socketfilterfw --setglobalstate on
sudo /usr/libexec/ApplicationFirewall/socketfilterfw --setblockall on
🧯 If You Can't Patch
- Isolate affected systems in separate network segments with strict firewall rules
- Implement application allowlisting to prevent execution of unauthorized code
🔍 How to Verify
Check if Vulnerable:
Check macOS version: System Settings > General > About, or run 'sw_vers' in terminalCheck Version:
sw_versVerify Fix Applied:
Verify version is Ventura 13.3+, Monterey 12.6.4+, or Big Sur 11.7.5+📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs in /Library/Logs/DiagnosticReports
- Unexpected system restarts
- Crash reports mentioning kernel
Network Indicators:
- Unusual network traffic patterns to macOS systems
- Multiple connection attempts to unusual ports
SIEM Query:
source="macos" AND (event="kernel_panic" OR event="system_crash" OR message="panic")🔗 References
- https://support.apple.com/en-us/HT213670
- https://support.apple.com/en-us/HT213675
- https://support.apple.com/en-us/HT213677
- https://support.apple.com/en-us/HT213670
- https://support.apple.com/en-us/HT213675
- https://support.apple.com/en-us/HT213677
- https://www.talosintelligence.com/vulnerability_reports/TALOS-2022-1688
