#VU17373 DDoS attack in Ubiquiti Networks products

Vulnerability identifier: #VU17373

Vulnerability risk: High

CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber

CVE-ID: N/A

CWE-ID: CWE-264

Exploitation vector: Remote access

Exploit availability: The vulnerability is being exploited in the wild

Vulnerable software:
PowerBeam
LiteBeam
AirGrid
NanoStation

Software vendor:
Ubiquiti Networks

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.

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

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