CVE-2020-29616
📋 TL;DR
This memory corruption vulnerability in macOS image processing allows attackers to execute arbitrary code by tricking users into opening maliciously crafted images. It affects macOS Mojave, Catalina, and earlier Big Sur versions. Users who process untrusted image files are at risk.
💻 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
Full system compromise with attacker gaining root privileges and persistent access to the device.
Likely Case
Local privilege escalation or remote code execution when user opens malicious image file.
If Mitigated
No impact if systems are fully patched and users avoid untrusted image files.
🎯 Exploit Status
Exploitation requires user interaction to open malicious image file, but no authentication needed once file is processed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Security Update 2020-007 (Mojave), Security Update 2020-001 (Catalina), macOS Big Sur 11.1
Vendor Advisory: https://support.apple.com/en-us/HT212011
Restart Required: Yes
Instructions:
1. Open System Preferences > Software Update. 2. Install available security updates. 3. Restart computer when prompted.
🔧 Temporary Workarounds
Disable automatic image preview
allPrevent automatic processing of image files in vulnerable applications
Use alternative image viewers
allUse third-party image viewers that don't use vulnerable macOS image processing libraries
🧯 If You Can't Patch
- Restrict user permissions to prevent execution of untrusted applications
- Implement application whitelisting to block vulnerable image processing components
🔍 How to Verify
Check if Vulnerable:
Check macOS version: if running Mojave, Catalina, or Big Sur earlier than patched versions, system is vulnerable.Check Version:
sw_versVerify Fix Applied:
Verify macOS version is Security Update 2020-007 (Mojave), Security Update 2020-001 (Catalina), or macOS Big Sur 11.1 or later.📡 Detection & Monitoring
Log Indicators:
- Crash reports from image processing applications
- Unexpected process execution following image file access
Network Indicators:
- Downloads of suspicious image files from untrusted sources
SIEM Query:
process_name:Preview AND (event_type:crash OR parent_process:unexpected)