CVE-2023-40423
📋 TL;DR
This is a memory corruption vulnerability in Apple operating systems that allows an app to execute arbitrary code with kernel privileges. It affects iOS, iPadOS, and macOS systems. Successful exploitation gives attackers complete control over affected devices.
💻 Affected Systems
- iOS
- iPadOS
- macOS
📦 What is this software?
Ipados by Apple
Ipados by Apple
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 device compromise with kernel-level persistence, data theft, and ability to bypass all security controls.
Likely Case
Malicious apps gaining root access to install malware, spyware, or ransomware on user devices.
If Mitigated
Limited impact if devices are fully patched and app installation is restricted to trusted sources.
🎯 Exploit Status
Exploitation requires a malicious app to be installed on the device. No public exploit code is available in the provided references.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: iOS 17.1, iPadOS 17.1, macOS Monterey 12.7.1, iOS 16.7.2, iPadOS 16.7.2, macOS Ventura 13.6.1, macOS Sonoma 14.1
Vendor Advisory: https://support.apple.com/en-us/HT213982
Restart Required: Yes
Instructions:
1. Go to Settings > General > Software Update on iOS/iPadOS or System Settings > General > Software Update on macOS. 2. Download and install the latest available update. 3. Restart the device when prompted.
🔧 Temporary Workarounds
Restrict App Installation
allOnly allow installation of apps from the App Store and trusted developers
Settings > General > VPN & Device Management > Verify app sources
🧯 If You Can't Patch
- Isolate affected devices from critical networks and sensitive data
- Implement strict application allowlisting policies
🔍 How to Verify
Check if Vulnerable:
Check Settings > General > About > Version on iOS/iPadOS or About This Mac > macOS versionCheck Version:
sw_vers (macOS) or Settings > General > About > Version (iOS/iPadOS)Verify Fix Applied:
Verify the version number matches or exceeds the patched versions listed above📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- Unexpected privilege escalation attempts
- Suspicious app behavior
Network Indicators:
- Unusual outbound connections from Apple devices
- Command and control traffic
SIEM Query:
source="apple_system_logs" AND (event="kernel_panic" OR event="privilege_escalation")🔗 References
- http://seclists.org/fulldisclosure/2023/Oct/19
- http://seclists.org/fulldisclosure/2023/Oct/21
- http://seclists.org/fulldisclosure/2023/Oct/23
- http://seclists.org/fulldisclosure/2023/Oct/24
- http://seclists.org/fulldisclosure/2023/Oct/26
- https://support.apple.com/en-us/HT213981
- https://support.apple.com/en-us/HT213982
- https://support.apple.com/en-us/HT213983
- https://support.apple.com/en-us/HT213984
- https://support.apple.com/en-us/HT213985
- https://support.apple.com/kb/HT213981
- https://support.apple.com/kb/HT213982
- https://support.apple.com/kb/HT213983
- https://support.apple.com/kb/HT213984
- https://support.apple.com/kb/HT213985
- http://seclists.org/fulldisclosure/2023/Oct/19
- http://seclists.org/fulldisclosure/2023/Oct/21
- http://seclists.org/fulldisclosure/2023/Oct/23
- http://seclists.org/fulldisclosure/2023/Oct/24
- http://seclists.org/fulldisclosure/2023/Oct/26
- https://support.apple.com/en-us/HT213981
- https://support.apple.com/en-us/HT213982
- https://support.apple.com/en-us/HT213983
- https://support.apple.com/en-us/HT213984
- https://support.apple.com/en-us/HT213985
- https://support.apple.com/kb/HT213981
- https://support.apple.com/kb/HT213982
- https://support.apple.com/kb/HT213983
- https://support.apple.com/kb/HT213984
- https://support.apple.com/kb/HT213985
