A mitigation mechanism is available for all victims who are under a DDoS attack carried out via Memcached servers. This mitigation technique relies on the attacked victim sending a “flush_all”” command back to the attacking servers. Corero said today that the DDoS vulnerability “”is more extensive than originally reported and can also be used by attackers to steal or modify data from vulnerable servers”” The company also said it reached out to national security agencies with the information it had so that agencies can prepare and send out the proper security alerts.”
Source: https://www.bleepingcomputer.com/news/security/technique-discovered-that-can-mitigate-memcached-ddos-attacks/