CVE-2021-30873
📋 TL;DR
CVE-2021-30873 is a privilege escalation vulnerability in macOS that allows malicious applications to gain elevated system privileges. This affects macOS systems prior to Monterey 12.0.1. The vulnerability stems from a logic issue in state management that can be exploited locally.
💻 Affected Systems
- macOS
📦 What is this software?
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 →⚠️ Risk & Real-World Impact
Worst Case
An attacker gains full root/system privileges on the compromised macOS system, enabling complete system takeover, data theft, and persistent backdoor installation.
Likely Case
Malicious applications or malware with user-level access could elevate to root privileges to bypass security controls, install additional malware, or access protected system resources.
If Mitigated
With proper application sandboxing, code signing enforcement, and user privilege restrictions, exploitation would be limited even if the vulnerability is triggered.
🎯 Exploit Status
Exploitation requires local application execution. The vulnerability was actively exploited in the wild according to Apple's security advisory.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: macOS Monterey 12.0.1
Vendor Advisory: https://support.apple.com/en-us/HT212869
Restart Required: Yes
Instructions:
1. Open System Preferences > Software Update. 2. Install macOS Monterey 12.0.1 update. 3. Restart the system when prompted. 4. Verify the update completed successfully.
🔧 Temporary Workarounds
Application Restriction
allRestrict installation and execution of untrusted applications using macOS security controls
sudo spctl --master-enable
sudo spctl --enable --label "Developer ID"
🧯 If You Can't Patch
- Implement strict application allowlisting to prevent execution of untrusted applications
- Enforce principle of least privilege by running user accounts with minimal privileges
🔍 How to Verify
Check if Vulnerable:
Check macOS version: if version is earlier than 12.0.1, the system is vulnerableCheck Version:
sw_versVerify Fix Applied:
Verify macOS version is 12.0.1 or later and check that Security Update 2021-007 is installed📡 Detection & Monitoring
Log Indicators:
- Unexpected privilege escalation events in system.log
- Unauthorized process spawning with elevated privileges
- Security framework violations
Network Indicators:
- Unusual outbound connections from system processes post-exploitation
SIEM Query:
source="macos_system_log" AND ("privilege escalation" OR "root access" OR "sudo") AND NOT user="legitimate_admin"