CVE-2018-4296
📋 TL;DR
CVE-2018-4296 is a critical privilege escalation vulnerability in macOS DiskArbitration framework that allows local attackers to gain root privileges. The vulnerability stems from insufficient ownership checks when handling disk operations. This affects all macOS systems prior to Mojave 10.14.
💻 Affected Systems
- macOS
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Local attacker gains full root privileges, enabling complete system compromise, data theft, persistence installation, and lateral movement.
Likely Case
Malicious local user or malware escalates privileges to root, bypassing security controls and gaining full system access.
If Mitigated
With proper patching, the vulnerability is eliminated; without patching, strong endpoint protection might detect exploitation attempts.
🎯 Exploit Status
Exploitation requires local access but is relatively straightforward once local access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: macOS Mojave 10.14 and later
Vendor Advisory: https://support.apple.com/en-us/HT209139
Restart Required: Yes
Instructions:
1. Open System Preferences > Software Update. 2. Install macOS Mojave 10.14 or later. 3. Restart the system when prompted.
🔧 Temporary Workarounds
No effective workarounds
allThis is a core system vulnerability requiring patching; no reliable workarounds exist.
🧯 If You Can't Patch
- Restrict physical and remote access to vulnerable systems
- Implement strict endpoint security monitoring for privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check macOS version: if earlier than 10.14, system is vulnerable.Check Version:
sw_vers -productVersionVerify Fix Applied:
Verify macOS version is 10.14 or later via System Information or terminal command.📡 Detection & Monitoring
Log Indicators:
- Unusual DiskArbitration service activity
- Sudden privilege escalation events
- Unexpected root process execution
Network Indicators:
- Not applicable - local exploitation only
SIEM Query:
Search for DiskArbitration service anomalies or privilege escalation from user to root without legitimate cause.