CVE-2019-8835
📋 TL;DR
This vulnerability allows attackers to execute arbitrary code on affected Apple devices by tricking users into processing malicious web content. It affects multiple Apple products including iOS, iPadOS, tvOS, Safari, and iCloud for Windows. The memory corruption issues could be exploited through crafted web pages or content.
💻 Affected Systems
- iOS
- iPadOS
- tvOS
- Safari
- iCloud for Windows
- iTunes for Windows
📦 What is this software?
Icloud by Apple
Icloud by Apple
Ipados by Apple
Itunes by Apple
Safari by Apple
Tvos by Apple
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control over the device, potentially leading to data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Remote code execution in the context of the web browser or affected application, allowing data exfiltration, credential theft, or installation of malware.
If Mitigated
Limited impact with proper network segmentation, application sandboxing, and user awareness preventing malicious content execution.
🎯 Exploit Status
Exploitation requires user interaction to process malicious web content. No public exploit code was available at disclosure.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: iOS 13.3, iPadOS 13.3, tvOS 13.3, Safari 13.0.4, iCloud for Windows 10.9, iTunes 12.10.3
Vendor Advisory: https://support.apple.com/en-us/HT210785
Restart Required: Yes
Instructions:
1. Open Settings app. 2. Navigate to General > Software Update. 3. Install available updates. For Windows applications, open the respective application and check for updates in Help menu or use Apple Software Update utility.
🔧 Temporary Workarounds
Disable JavaScript
allDisable JavaScript in Safari to prevent execution of malicious web content
Safari > Preferences > Security > uncheck 'Enable JavaScript'
Use alternative browser
allUse a different web browser that is not affected by this vulnerability
🧯 If You Can't Patch
- Implement network filtering to block malicious websites and web content
- Enable application sandboxing and restrict user privileges to limit impact
🔍 How to Verify
Check if Vulnerable:
Check current version against affected versions list. For iOS/iPadOS: Settings > General > About > Version. For Safari: Safari > About Safari.Check Version:
iOS/iPadOS: Settings > General > About > Version. Windows: iCloud/iTunes > Help > AboutVerify Fix Applied:
Verify version number matches or exceeds patched versions: iOS/iPadOS 13.3+, tvOS 13.3+, Safari 13.0.4+, iCloud for Windows 10.9+, iTunes 12.10.3+📡 Detection & Monitoring
Log Indicators:
- Application crashes in Safari or related Apple applications
- Unusual process creation from web browser processes
- Memory access violation errors
Network Indicators:
- Connections to known malicious domains serving crafted web content
- Unusual outbound traffic from affected applications
SIEM Query:
source="*safari*" OR source="*webkit*" AND (event_type="crash" OR event_type="memory_violation")🔗 References
- https://support.apple.com/en-us/HT210785
- https://support.apple.com/en-us/HT210790
- https://support.apple.com/en-us/HT210792
- https://support.apple.com/en-us/HT210793
- https://support.apple.com/en-us/HT210794
- https://support.apple.com/en-us/HT210795
- https://support.apple.com/en-us/HT210785
- https://support.apple.com/en-us/HT210790
- https://support.apple.com/en-us/HT210792
- https://support.apple.com/en-us/HT210793
- https://support.apple.com/en-us/HT210794
- https://support.apple.com/en-us/HT210795
