UniFi OS ucs-update Sudo Privilege Escalation

Ethan Andrews@eandrews

•updated Jun 9, 2026•1•0•5

This rule detects potential privilege escalation attempts on UniFi OS systems where the 'ucs-update' service account uses 'sudo' to execute sensitive commands like 'dpkg', 'chmod', or 'systemctl'. This behavior is indicative of the vulnerability described in the Bishop Fox research, where an unauthenticated RCE chain can lead to root escalation.