CVE-2021-20172
📋 TL;DR
This CVE describes a local privilege escalation vulnerability in Netgear Genie Installer for macOS. An attacker with local access can overwrite specific files during installation to gain root privileges. Only macOS users installing Netgear Genie are affected.
💻 Affected Systems
- Netgear Genie Installer
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with root access, allowing installation of persistent malware, data theft, and full system control.
Likely Case
Local attacker gains administrative privileges to install additional malware, modify system files, or access protected data.
If Mitigated
Limited impact with proper access controls preventing unauthorized local access to installation processes.
🎯 Exploit Status
Exploitation requires local access and knowledge of vulnerable file paths during installation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Netgear advisory for specific patched version
Vendor Advisory: https://kb.netgear.com/000063723/Security-Advisory-for-Local-Privilege-Escalation-on-NETGEAR-Genie-Installer-for-macOS-PSV-2021-0073
Restart Required: No
Instructions:
1. Uninstall existing Netgear Genie. 2. Download latest version from official Netgear website. 3. Install updated version. 4. Verify installation completed successfully.
🔧 Temporary Workarounds
Remove Netgear Genie
macosUninstall Netgear Genie if not required
sudo rm -rf /Applications/Netgear\ Genie.app
sudo rm -rf ~/Library/Application\ Support/Netgear\ Genie
Restrict installation permissions
macosLimit who can install software on macOS systems
🧯 If You Can't Patch
- Restrict physical and remote access to affected systems
- Implement strict privilege separation and monitor for unauthorized privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check if Netgear Genie is installed: ls /Applications/ | grep -i netgearCheck Version:
Check application version in Netgear Genie About menu or package metadataVerify Fix Applied:
Verify Netgear Genie version matches latest patched version from vendor advisory📡 Detection & Monitoring
Log Indicators:
- Unauthorized file modifications during Netgear Genie installation
- Unexpected privilege escalation events
- Suspicious process creation with root privileges
Network Indicators:
- None - this is a local attack
SIEM Query:
source="macos" AND (process="installer" OR process="Netgear Genie") AND (event="privilege_escalation" OR event="file_modification")