CVE-2020-29618
📋 TL;DR
CVE-2020-29618 is an out-of-bounds read vulnerability in Apple's image processing that could allow arbitrary code execution when processing malicious images. It affects multiple Apple operating systems and iCloud for Windows. Attackers could exploit this to run malicious code on vulnerable devices.
💻 Affected Systems
- tvOS
- macOS
- iOS
- iPadOS
- watchOS
- iCloud for Windows
📦 What is this software?
Icloud 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 →Tvos by Apple
Watchos by Apple
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining control of the device, potentially leading to data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Application crash or limited information disclosure from memory reads, though arbitrary code execution is possible with crafted exploits.
If Mitigated
No impact if systems are patched to the fixed versions or if image processing from untrusted sources is blocked.
🎯 Exploit Status
Exploitation requires crafting malicious images that trigger the out-of-bounds read, potentially leading to code execution. No public proof-of-concept has been disclosed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: tvOS 14.3, macOS Big Sur 11.1, Security Update 2020-001 Catalina, Security Update 2020-007 Mojave, iOS 14.3, iPadOS 14.3, iCloud for Windows 12.0, watchOS 7.2
Vendor Advisory: https://support.apple.com/en-us/HT212003
Restart Required: Yes
Instructions:
1. Open Settings/System Preferences on the device. 2. Navigate to Software Update. 3. Download and install the latest available update. 4. Restart the device after installation completes.
🔧 Temporary Workarounds
Block untrusted image sources
allPrevent processing of images from untrusted or external sources through application controls or network filtering.
🧯 If You Can't Patch
- Implement application whitelisting to prevent execution of unauthorized code.
- Use network segmentation to isolate vulnerable systems and monitor for suspicious image processing activity.
🔍 How to Verify
Check if Vulnerable:
Check the operating system version against the affected versions list. On Apple devices: Settings > General > About > Version. On Windows with iCloud: iCloud > Help > About iCloud.Check Version:
On macOS: sw_vers -productVersion. On iOS/iPadOS: Settings > General > About > Version. On Windows: iCloud > Help > About iCloud.Verify Fix Applied:
Verify the version matches or exceeds the patched versions listed in the fix information.📡 Detection & Monitoring
Log Indicators:
- Application crashes in image processing components
- Unusual memory access patterns in system logs
Network Indicators:
- Unexpected downloads of image files to vulnerable systems
- Outbound connections from systems after image processing
SIEM Query:
Image: (process_name IN ('image processing binaries')) AND (event_type='crash' OR memory_violation='true')🔗 References
- https://support.apple.com/en-us/HT212003
- https://support.apple.com/en-us/HT212005
- https://support.apple.com/en-us/HT212009
- https://support.apple.com/en-us/HT212011
- https://support.apple.com/en-us/HT212145
- https://support.apple.com/en-us/HT212003
- https://support.apple.com/en-us/HT212005
- https://support.apple.com/en-us/HT212009
- https://support.apple.com/en-us/HT212011
- https://support.apple.com/en-us/HT212145
