CVE-2021-30814
📋 TL;DR
CVE-2021-30814 is a memory corruption vulnerability in Apple's image processing that allows arbitrary code execution when processing malicious images. It affects iOS, iPadOS, tvOS, and watchOS devices. Attackers can exploit this by tricking users into opening specially crafted image files.
💻 Affected Systems
- iPhone
- iPad
- Apple TV
- Apple Watch
📦 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 →Tvos by Apple
Watchos by Apple
⚠️ Risk & Real-World Impact
Worst Case
Full device compromise with attacker gaining root privileges and persistent access to all device data and capabilities.
Likely Case
Malicious app or website delivers crafted image that executes code with user privileges, potentially stealing data or installing malware.
If Mitigated
No impact if devices are patched to latest OS versions or if image processing is restricted to trusted sources only.
🎯 Exploit Status
Requires user interaction to open malicious image. Exploit chains combining this with other vulnerabilities have been observed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: iOS 15, iPadOS 15, tvOS 15, watchOS 8
Vendor Advisory: https://support.apple.com/en-us/HT212814
Restart Required: Yes
Instructions:
1. Go to Settings > General > Software Update. 2. Download and install the latest iOS/iPadOS/tvOS/watchOS update. 3. Restart device when prompted.
🔧 Temporary Workarounds
Restrict image sources
allOnly open images from trusted sources and avoid downloading/opening images from unknown websites or messages.
Disable automatic image loading
allConfigure email clients and browsers to not automatically load remote images.
🧯 If You Can't Patch
- Segment vulnerable devices on separate network segments
- Implement application allowlisting to restrict which apps can process images
🔍 How to Verify
Check if Vulnerable:
Check Settings > General > About > Version. If version is below iOS 15, iPadOS 15, tvOS 15, or watchOS 8, device is vulnerable.Check Version:
Settings > General > About > Version (no CLI command available for consumer Apple devices)Verify Fix Applied:
Verify OS version is iOS 15+, iPadOS 15+, tvOS 15+, or watchOS 8+ in Settings > General > About > Version.📡 Detection & Monitoring
Log Indicators:
- Crash reports from image processing frameworks
- Unexpected process creation from image viewing apps
Network Indicators:
- Downloads of suspicious image files from untrusted sources
SIEM Query:
Image: (process_name contains "Photos" OR process_name contains "Safari") AND (event_type="crash" OR parent_process_changed=true)🔗 References
- https://support.apple.com/en-us/HT212814
- https://support.apple.com/en-us/HT212815
- https://support.apple.com/en-us/HT212819
- https://support.apple.com/kb/HT212869
- https://support.apple.com/kb/HT212953
- https://support.apple.com/en-us/HT212814
- https://support.apple.com/en-us/HT212815
- https://support.apple.com/en-us/HT212819
- https://support.apple.com/kb/HT212869
- https://support.apple.com/kb/HT212953
