CVE-2021-30710
📋 TL;DR
This memory corruption vulnerability in Apple operating systems allows malicious applications to cause denial of service or potentially leak memory contents. It affects iOS, iPadOS, macOS, tvOS, and watchOS users running vulnerable versions. Attackers could exploit this to crash systems or access sensitive information from memory.
💻 Affected Systems
- iOS
- iPadOS
- macOS
- tvOS
- watchOS
📦 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
Malicious application could cause system crashes (DoS) or potentially access sensitive memory contents, leading to information disclosure of credentials, encryption keys, or other protected data.
Likely Case
Most probable impact is denial of service through application or system crashes, though memory disclosure is possible in targeted attacks.
If Mitigated
With proper application sandboxing and security controls, impact is limited to application crashes without system-wide compromise.
🎯 Exploit Status
Exploitation requires user to install and run malicious application. No known public exploits, but memory corruption vulnerabilities are often weaponized.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: tvOS 14.6, iOS 14.6, iPadOS 14.6, macOS Big Sur 11.4, watchOS 7.5, Security Update 2021-004 Mojave, Security Update 2021-003 Catalina
Vendor Advisory: https://support.apple.com/en-us/HT212528
Restart Required: Yes
Instructions:
1. Go to Settings > General > Software Update on iOS/iPadOS/watchOS/tvOS. 2. Install available updates. 3. For macOS, go to System Preferences > Software Update. 4. Install all security updates. 5. Restart device after installation.
🔧 Temporary Workarounds
Application Restriction
allRestrict installation of applications from untrusted sources to prevent malicious apps from being installed.
🧯 If You Can't Patch
- Implement strict application control policies to prevent installation of untrusted applications
- Monitor for unusual application crashes or memory-related errors in system logs
🔍 How to Verify
Check if Vulnerable:
Check current OS version against affected versions. On iOS/iPadOS: Settings > General > About > Version. On macOS: Apple menu > About This Mac.Check Version:
iOS/iPadOS/watchOS/tvOS: No command line. macOS: 'sw_vers' command shows version.Verify Fix Applied:
Verify OS version is equal to or newer than patched versions listed in fix_official section.📡 Detection & Monitoring
Log Indicators:
- Unexpected application crashes
- Memory access violation errors
- Kernel panic logs
Network Indicators:
- No direct network indicators - local exploitation only
SIEM Query:
Search for: 'kernel panic', 'segmentation fault', 'memory corruption', or application crash logs from Apple devices🔗 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/HT212532
- https://support.apple.com/en-us/HT212533
- 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/HT212532
- https://support.apple.com/en-us/HT212533
