Re: New Active Exploit: memcached on port 11211 UDP & TCP being exploited for reflection attacks

["Roland Dobbins" <rdobbins () arbor net>]

On 28 Feb 2018, at 5:26, Ca By wrote:

> Just udp.

This Arbor Threat Summary discusses the TCP issue, as well, FWIW:

<https://www.arbornetworks.com/blog/asert/memcached-reflection-amplification-description-ddos-attack-mitigation-recommendations/>

'It should also be noted that memcached priming queries can also be 
directed towards TCP/11211 on abusable memcached servers. TCP is not 
currently considered a high-risk memcached reflection/amplification 
transport as TCP queries cannot be reliably spoofed.'

We also recommend implementing situationally-appropriate network access 
policies at the IDC edge which disallow unwanted UDP/11211 as well as 
TCP/11211 from reaching abusable memcached deployments.

-----------------------------------
Roland Dobbins <rdobbins () arbor net>