CVE-2021-30693
📋 TL;DR
This vulnerability allows arbitrary code execution by processing a maliciously crafted image. It affects macOS, iOS, and iPadOS systems with insufficient input validation. Attackers can exploit this to run arbitrary code on affected devices.
💻 Affected Systems
- macOS
- iOS
- iPadOS
📦 What is this software?
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 →⚠️ Risk & Real-World Impact
Worst Case
Full system compromise leading to data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Malicious code execution with user-level privileges, potentially leading to data exfiltration or further system exploitation.
If Mitigated
Limited impact with proper patch management and security controls preventing malicious image processing.
🎯 Exploit Status
Exploitation requires user interaction to process malicious image. No public exploit code is known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: macOS Big Sur 11.4, Security Update 2021-003 Catalina, Security Update 2021-004 Mojave, iOS 14.6, iPadOS 14.6
Vendor Advisory: https://support.apple.com/en-us/HT212528
Restart Required: Yes
Instructions:
1. Open System Preferences > 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 image files from untrusted sources.
🧯 If You Can't Patch
- Implement application whitelisting to prevent unauthorized code execution
- Use network segmentation to isolate vulnerable systems and monitor for suspicious image processing
🔍 How to Verify
Check if Vulnerable:
Check macOS version: About This Mac > Overview. Check iOS/iPadOS version: Settings > General > About.Check Version:
macOS: sw_vers -productVersion; iOS/iPadOS: Settings > General > About > VersionVerify Fix Applied:
Verify version is equal to or newer than patched versions listed in fix_official.patch_version.📡 Detection & Monitoring
Log Indicators:
- Unexpected process crashes related to image processing
- Suspicious file access to image files
Network Indicators:
- Unusual outbound connections following image file access
SIEM Query:
Process creation events from image processing applications with suspicious command-line arguments🔗 References
- https://support.apple.com/en-us/HT212528
- https://support.apple.com/en-us/HT212529
- https://support.apple.com/en-us/HT212530
- https://support.apple.com/en-us/HT212531
- https://support.apple.com/en-us/HT212528
- https://support.apple.com/en-us/HT212529
- https://support.apple.com/en-us/HT212530
- https://support.apple.com/en-us/HT212531
