CVE-2019-8662
📋 TL;DR
CVE-2019-8662 is a use-after-free vulnerability in Apple's NSDictionary deserialization that allows an attacker to execute arbitrary code or cause application crashes. It affects iOS, macOS, tvOS, and watchOS devices running outdated versions. Attackers can exploit this by tricking users into processing maliciously crafted data.
💻 Affected Systems
- iOS
- macOS
- tvOS
- watchOS
📦 What is this software?
Tvos by Apple
Watchos by Apple
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, data theft, or persistent malware installation.
Likely Case
Application crashes (denial of service) or limited code execution in sandboxed contexts.
If Mitigated
No impact if patched; unpatched systems remain vulnerable to exploitation attempts.
🎯 Exploit Status
Exploitation requires crafting malicious NSDictionary data, but no public proof-of-concept has been documented.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: iOS 12.4, macOS Mojave 10.14.6, tvOS 12.4, watchOS 5.3
Vendor Advisory: https://support.apple.com/HT210346
Restart Required: Yes
Instructions:
1. Open Settings (iOS/watchOS/tvOS) or System Preferences (macOS). 2. Navigate to Software Update. 3. Download and install the latest available update. 4. Restart the device when prompted.
🔧 Temporary Workarounds
Disable untrusted data processing
allAvoid processing NSDictionary data from untrusted sources in applications.
Not applicable - configuration-based workaround
🧯 If You Can't Patch
- Isolate affected devices from untrusted networks and data sources.
- Implement application whitelisting to prevent execution of potentially malicious code.
🔍 How to Verify
Check if Vulnerable:
Check the device's operating system version against the affected versions list.Check Version:
iOS/watchOS/tvOS: Settings > General > About > Version. macOS: Apple menu > About This Mac.Verify Fix Applied:
Confirm the device is running iOS 12.4+, macOS 10.14.6+, tvOS 12.4+, or watchOS 5.3+.📡 Detection & Monitoring
Log Indicators:
- Application crashes related to NSDictionary processing
- Unexpected memory access errors in system logs
Network Indicators:
- Unusual data transfers to/from devices running vulnerable versions
SIEM Query:
source="apple_system_logs" AND (event="crash" OR event="memory_error") AND process="*NSDictionary*"