CVE-2024-42025
📋 TL;DR
This CVE describes a command injection vulnerability in self-hosted UniFi Network Application servers running Linux. An attacker with existing 'unifi' user shell access can execute arbitrary commands with root privileges, leading to full system compromise. This affects UniFi Network Application version 8.3.32 and earlier on Linux systems.
💻 Affected Systems
- UniFi Network Application
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with root access, allowing installation of persistent backdoors, data exfiltration, and lateral movement to other systems.
Likely Case
Privilege escalation from unifi user to root, enabling full control of the UniFi server and potential compromise of managed network devices.
If Mitigated
Limited impact if proper access controls prevent unifi user shell access and network segmentation isolates the UniFi server.
🎯 Exploit Status
Requires existing unifi user shell access. The vulnerability is in improper command sanitization allowing privilege escalation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 8.3.33 or later
Vendor Advisory: https://community.ui.com/releases/Security-Advisory-Bulletin-042-042/c4f68b56-cdc4-4128-b2cb-5870209d1704
Restart Required: Yes
Instructions:
1. Backup your UniFi configuration. 2. Update UniFi Network Application to version 8.3.33 or later via the UniFi web interface or command line. 3. Restart the UniFi service or reboot the server.
🔧 Temporary Workarounds
Restrict unifi user shell access
linuxPrevent unifi user from obtaining shell access by modifying user permissions
usermod -s /sbin/nologin unifi
Implement strict access controls
linuxLimit SSH access to the UniFi server to authorized administrators only
Edit /etc/ssh/sshd_config to restrict access
🧯 If You Can't Patch
- Implement network segmentation to isolate UniFi servers from critical systems
- Enforce strict access controls and monitor for unauthorized shell access attempts
🔍 How to Verify
Check if Vulnerable:
Check UniFi Network Application version via web interface or run: dpkg -l | grep unifiCheck Version:
dpkg -l | grep unifi | awk '{print $3}'Verify Fix Applied:
Confirm version is 8.3.33 or later and test that unifi user cannot execute privileged commands📡 Detection & Monitoring
Log Indicators:
- Unusual command execution by unifi user
- Failed privilege escalation attempts in system logs
- Sudo or su commands from unifi user
Network Indicators:
- Unexpected outbound connections from UniFi server
- SSH connections to UniFi server from unauthorized sources
SIEM Query:
source="unifi" OR user="unifi" AND (process="sudo" OR process="su" OR command="*root*" OR command="*privilege*")