CVE-2021-30779
📋 TL;DR
This vulnerability allows arbitrary code execution by processing a maliciously crafted image. It affects Apple iOS, macOS, watchOS, and tvOS devices. Attackers could exploit this to run unauthorized code on affected devices.
💻 Affected Systems
- iOS
- macOS
- watchOS
- tvOS
📦 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 →Tvos by Apple
Watchos by Apple
⚠️ Risk & Real-World Impact
Worst Case
Full device compromise leading to data theft, surveillance, ransomware deployment, or persistent backdoor installation.
Likely Case
Malicious app or website could exploit this to gain elevated privileges and access sensitive data.
If Mitigated
Limited impact with proper network segmentation and application sandboxing, but still significant risk.
🎯 Exploit Status
Exploitation requires user interaction to process malicious image, but no authentication needed once triggered.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: iOS 14.7, macOS Big Sur 11.5, watchOS 7.6, tvOS 14.7
Vendor Advisory: https://support.apple.com/en-us/HT212601
Restart Required: Yes
Instructions:
1. Open Settings app. 2. Go to General > Software Update. 3. Download and install available update. 4. Restart device when prompted.
🔧 Temporary Workarounds
Disable automatic image processing
allPrevent automatic image processing in web browsers and email clients
Use application sandboxing
macOSEnsure applications run with minimal privileges
🧯 If You Can't Patch
- Segment affected devices from critical network resources
- Implement strict application allowlisting to prevent unauthorized apps
🔍 How to Verify
Check if Vulnerable:
Check current OS version against affected versions listCheck Version:
iOS: Settings > General > About > Version. macOS: Apple menu > About This Mac > macOS version.Verify Fix Applied:
Verify OS version is at or above patched versions📡 Detection & Monitoring
Log Indicators:
- Unexpected process crashes in image processing services
- Suspicious file access patterns
Network Indicators:
- Unusual outbound connections from image processing applications
SIEM Query:
Process creation events from image processing frameworks with suspicious parent processes🔗 References
- https://support.apple.com/en-us/HT212601
- https://support.apple.com/en-us/HT212602
- https://support.apple.com/en-us/HT212604
- https://support.apple.com/en-us/HT212605
- https://support.apple.com/en-us/HT212601
- https://support.apple.com/en-us/HT212602
- https://support.apple.com/en-us/HT212604
- https://support.apple.com/en-us/HT212605
