CVE-2019-8807
📋 TL;DR
This is a memory corruption vulnerability in macOS that allows an application to execute arbitrary code with system privileges. It affects macOS systems before Catalina 10.15.1. Attackers could gain complete control of affected systems.
💻 Affected Systems
- macOS
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with root privileges, allowing installation of persistent malware, data theft, and lateral movement across the network.
Likely Case
Local privilege escalation where a malicious application gains system privileges to bypass security controls and access sensitive data.
If Mitigated
Limited impact if systems are fully patched and have application sandboxing/enhanced security controls in place.
🎯 Exploit Status
Requires local application execution. No public exploit code is known, but memory corruption vulnerabilities are often weaponized.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: macOS Catalina 10.15.1
Vendor Advisory: https://support.apple.com/HT210722
Restart Required: Yes
Instructions:
1. Open System Preferences > Software Update
2. Install macOS Catalina 10.15.1 update
3. Restart the system when prompted
🔧 Temporary Workarounds
Application Sandboxing
allEnable and enforce application sandboxing to limit potential damage from malicious applications
Restrict Application Execution
allUse macOS Gatekeeper and restrict application execution to App Store and identified developers only
sudo spctl --master-enable
sudo spctl --enable
🧯 If You Can't Patch
- Isolate vulnerable systems from critical networks and sensitive data
- Implement strict application control policies and monitor for suspicious process execution
🔍 How to Verify
Check if Vulnerable:
Check macOS version: if earlier than 10.15.1, system is vulnerableCheck Version:
sw_versVerify Fix Applied:
Verify macOS version is 10.15.1 or later📡 Detection & Monitoring
Log Indicators:
- Unusual process spawning with elevated privileges
- Suspicious application execution patterns
- Kernel extension loading anomalies
Network Indicators:
- Unexpected outbound connections from system processes
- Network traffic from privileged services to unusual destinations
SIEM Query:
source="macos" AND (event_type="process_execution" AND privilege="root") AND process_name NOT IN ("legitimate_system_processes")