Vulnerability identifier: #VU17373

Vulnerability risk: High

CVSSv3.1: 6.6 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H/E:H/RL:W/RC:C]

CVE-ID: N/A

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
PowerBeam
Hardware solutions / Firmware
LiteBeam
Hardware solutions / Firmware
AirGrid
Hardware solutions / Firmware
NanoStation
Hardware solutions / Firmware

Vendor: Ubiquiti Networks

Description
The vulnerability allows a remote attacker to conduct DDoS attack.

The weakness exists due to a flaw in a "discovery service" running on port 10001/UDP. A remote attacker can send small packets of 56 bytes to port 10001/UDP on Ubiquiti devices, which are reflecting and relaying the packets to a target's IP address amplified to a size of 206 bytes (amplification factor of 3.67).

Note: the vulnerability has been actively exploited since July 2018.

Mitigation
The vendor has released a workaround, and is in the process of putting together an official fix.
https://community.ubnt.com/t5/EdgeRouter/UDP-broadcasts-on-port-10001/td-p/461223

Vulnerable software versions

PowerBeam: All versions

LiteBeam: All versions

AirGrid: All versions

NanoStation: All versions

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External links
http://twitter.com/troutman/status/1090212243197870081
http://blog.rapid7.com/2019/02/01/ubiquiti-discovery-service-exposures/
http://www.us-cert.gov/ncas/alerts/TA14-017A

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.