CVE-2023-42899
📋 TL;DR
This memory handling vulnerability in Apple's image processing components allows arbitrary code execution when processing a malicious image. It affects multiple Apple operating systems including macOS, iOS, iPadOS, watchOS, and tvOS. Attackers can exploit this to run unauthorized code on affected devices.
💻 Affected Systems
- macOS
- iOS
- iPadOS
- watchOS
- tvOS
📦 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 →Tvos by Apple
Watchos by Apple
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining root/system privileges, enabling data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Local privilege escalation or remote code execution via malicious images delivered through web pages, messages, or email attachments.
If Mitigated
Limited impact with proper network segmentation, application sandboxing, and user privilege restrictions preventing lateral movement.
🎯 Exploit Status
Exploitation requires user interaction to process malicious image, but no authentication is needed. Memory corruption vulnerabilities in image parsing are commonly exploited.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: macOS Sonoma 14.2, iOS 17.2 and iPadOS 17.2, watchOS 10.2, macOS Ventura 13.6.3, tvOS 17.2, iOS 16.7.3 and iPadOS 16.7.3, macOS Monterey 12.7.2
Vendor Advisory: https://support.apple.com/en-us/HT214031
Restart Required: Yes
Instructions:
1. Open System Settings > General > Software Update. 2. Install available updates. 3. Restart device when prompted.
🔧 Temporary Workarounds
Disable automatic image processing
allConfigure applications to not automatically process or preview images from untrusted sources
Network filtering
allBlock or scan image files at network perimeter
🧯 If You Can't Patch
- Implement application allowlisting to restrict which applications can process image files
- Deploy endpoint detection and response (EDR) solutions to monitor for suspicious image processing behavior
🔍 How to Verify
Check if Vulnerable:
Check current OS version against patched versions listed in affected_systems.versionsCheck Version:
macOS: sw_vers -productVersion; iOS/iPadOS: Settings > General > About > VersionVerify Fix Applied:
Verify OS version matches or exceeds patched versions after update📡 Detection & Monitoring
Log Indicators:
- Unusual image processing errors in system logs
- Crash reports from image-related processes
- Suspicious file access patterns
Network Indicators:
- Unusual image file downloads from untrusted sources
- Image files with abnormal headers or sizes
SIEM Query:
source="apple_system_logs" AND (process="image" OR process="graphics") AND (event="crash" OR event="error")🔗 References
- http://seclists.org/fulldisclosure/2023/Dec/10
- http://seclists.org/fulldisclosure/2023/Dec/11
- http://seclists.org/fulldisclosure/2023/Dec/12
- http://seclists.org/fulldisclosure/2023/Dec/13
- http://seclists.org/fulldisclosure/2023/Dec/7
- http://seclists.org/fulldisclosure/2023/Dec/8
- http://seclists.org/fulldisclosure/2023/Dec/9
- https://support.apple.com/en-us/HT214034
- https://support.apple.com/en-us/HT214035
- 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/en-us/HT214040
- https://support.apple.com/en-us/HT214041
- http://seclists.org/fulldisclosure/2023/Dec/10
- http://seclists.org/fulldisclosure/2023/Dec/11
- http://seclists.org/fulldisclosure/2023/Dec/12
- http://seclists.org/fulldisclosure/2023/Dec/13
- http://seclists.org/fulldisclosure/2023/Dec/7
- http://seclists.org/fulldisclosure/2023/Dec/8
- http://seclists.org/fulldisclosure/2023/Dec/9
- https://support.apple.com/en-us/HT214034
- https://support.apple.com/en-us/HT214035
- 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/en-us/HT214040
- https://support.apple.com/en-us/HT214041
- https://support.apple.com/kb/HT214035
- https://support.apple.com/kb/HT214036
- https://support.apple.com/kb/HT214037
- https://support.apple.com/kb/HT214040
- https://support.apple.com/kb/HT214041
