CVE-2021-30903
📋 TL;DR
This vulnerability allows a local attacker to cause application crashes or execute arbitrary code on affected Apple devices. It affects iOS, iPadOS, and macOS systems before specific patched versions. The attacker needs local access to the device to exploit this issue.
💻 Affected Systems
- iOS
- iPadOS
- macOS
📦 What is this software?
Ipad Os 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 arbitrary code execution leading to data theft, persistence, or lateral movement within the network.
Likely Case
Application crashes or denial of service affecting specific applications or system components.
If Mitigated
Limited impact with proper patch management and local access controls in place.
🎯 Exploit Status
Requires local access to the device. Apple has not disclosed technical details about the vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: iOS 14.8.1, iPadOS 14.8.1, iOS 15.1, iPadOS 15.1, macOS Monterey 12.0.1
Vendor Advisory: https://support.apple.com/en-us/HT212867
Restart Required: Yes
Instructions:
1. Go to Settings > General > Software Update on iOS/iPadOS or System Preferences > Software Update on macOS. 2. Download and install the available update. 3. Restart the device when prompted.
🔧 Temporary Workarounds
Restrict local access
allLimit physical and remote local access to vulnerable devices through access controls and user privilege management.
🧯 If You Can't Patch
- Implement strict access controls to limit who can interact with affected devices locally.
- Monitor for unusual application crashes or unexpected process behavior that might indicate exploitation attempts.
🔍 How to Verify
Check if Vulnerable:
Check the device version in Settings > General > About on iOS/iPadOS or About This Mac on macOS.Check Version:
iOS/iPadOS: Settings > General > About > Version; macOS: About This Mac > macOS versionVerify Fix Applied:
Verify the installed version matches or exceeds the patched versions listed in the fix information.📡 Detection & Monitoring
Log Indicators:
- Unexpected application crashes, abnormal process terminations, or privilege escalation attempts in system logs.
Network Indicators:
- No direct network indicators as this is a local vulnerability.
SIEM Query:
Search for application crash logs or security events indicating local privilege escalation on Apple devices.🔗 References
- https://support.apple.com/en-us/HT212867
- https://support.apple.com/en-us/HT212868
- https://support.apple.com/en-us/HT212869
- https://support.apple.com/kb/HT212871
- https://support.apple.com/kb/HT212872
- https://support.apple.com/kb/HT212874
- https://support.apple.com/kb/HT212876
- https://support.apple.com/en-us/HT212867
- https://support.apple.com/en-us/HT212868
- https://support.apple.com/en-us/HT212869
- https://support.apple.com/kb/HT212871
- https://support.apple.com/kb/HT212872
- https://support.apple.com/kb/HT212874
- https://support.apple.com/kb/HT212876
