Vulnerability Details

UBNT Discovery Protocol Amplification Attack

Published: 2019-02-04 08:09:35

CVSS Base Vector:
AV:N/AC:L/Au:N/C:N/I:N/A:P

Detection Type:
Remote Banner

Solution Type:
Workaround

Summary:
A publicly access Ubiquity device exposing the UBNT Discovery Protocol can be exploited to participate in a Distributed Denial of Service (DDoS) attack.

Technical Details:
There are reports that there are ongoing attacks against devices with UBNT Discovery Protocol reachable which either result in a loss of device management or are used as a weak DDoS amplificatior. The basic attack technique consists of an attacker sending a valid query request to a UBNT server with the source address spoofed to be the victim's address. Since UBNT Discovery Protocol uses UDP this is trivialy done. When the UBNT server sends the response, it is sent instead to the victim. Because the size of the response is typically considerably larger than the request, the attacker is able to amplify the volume of traffic directed at the victim (the amplification factor is around 30-35x). By leveraging a botnet to perform additional spoofed queries, an attacker can produce an overwhelming amount of traffic with little effort.

Detection Method:
Checks if the UBNT Discovery Protocol is reachable.

Recommendations:
Ubiquiti recommends to block port 10001/udp at the perimeter.

References:

https://twitter.com/troutman/status/1090212243197870081
https://community.ubnt.com/t5/airMAX-General-Discussion/Possible-Exploit-Losing-access-to-SSH-and-HTTP-HTTPS-on-CPEs/td-p/2411064
https://community.ubnt.com/t5/airMAX-General-Discussion/airOS-airMAX-and-management-access/td-p/2654023
https://www.us-cert.gov/ncas/alerts/TA14-017A
https://blog.rapid7.com/2019/02/01/ubiquiti-discovery-service-exposures/

Severity
Medium
CVSS Score
5.0
Published
2019-02-04
Modified
2019-02-04
Category
Denial of Service

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