CVE-2022-26721
📋 TL;DR
CVE-2022-26721 is a memory initialization vulnerability in macOS that allows a malicious application to gain root privileges. This affects macOS Catalina, Big Sur, and Monterey systems that haven't been updated. An attacker could execute arbitrary code with the highest system privileges.
💻 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 →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
Complete system compromise with root-level persistence, data exfiltration, and installation of backdoors or ransomware.
Likely Case
Local privilege escalation allowing malware to bypass security controls and gain persistent access.
If Mitigated
Limited impact if proper application sandboxing and least privilege principles are enforced.
🎯 Exploit Status
Requires user to execute malicious application. Memory corruption vulnerabilities typically require some sophistication to exploit reliably.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Security Update 2022-004 Catalina, macOS Monterey 12.4, macOS Big Sur 11.6.6
Vendor Advisory: https://support.apple.com/en-us/HT213255
Restart Required: Yes
Instructions:
1. Open System Preferences > Software Update. 2. Install available security updates. 3. Restart when prompted.
🔧 Temporary Workarounds
Application Whitelisting
allRestrict execution of untrusted applications using macOS security features
sudo spctl --master-enable
sudo spctl --enable --label "Developer ID"
🧯 If You Can't Patch
- Implement strict application control policies to prevent execution of untrusted software
- Enforce least privilege principles and limit user administrative rights
🔍 How to Verify
Check if Vulnerable:
Check macOS version: if running Catalina, Big Sur, or Monterey without the specified security updates, system is vulnerable.Check Version:
sw_versVerify Fix Applied:
Verify macOS version matches patched versions: Catalina with Security Update 2022-004, Monterey 12.4+, or Big Sur 11.6.6+.📡 Detection & Monitoring
Log Indicators:
- Unexpected privilege escalation events in system logs
- Processes running with unexpected root privileges
Network Indicators:
- Not applicable - local exploit only
SIEM Query:
source="macos" AND (event_type="privilege_escalation" OR process_user="root") AND process_name NOT IN (approved_root_processes)