Memcrashed – Major amplification attacks from UDP port 11211 (opens in new tab)

(blog.cloudflare.com)

15 pointsrb2e8y ago4 comments

4 comments

Anyone run memcache outside their network to be able to get attacked like this? To be services like memcache, db, etc should all be internal use only and never allowed access from the outside.

temprature8y ago

There's a lot of people install memcached without realising it listens on all addresses by default. If you install it and run it via whatever system your OS/distro uses, you'd never need to look at the man page so you wouldn't find this out.

toadkicker8y ago

We set them up that way and then someone who isn't so strong with networking opens it up to 'fix it'.

muglug8y ago

I was caught up in this, but luckily my hosting provider (MediaTemple) disabled my server due to the large bandwidth overruns.

It was fun to spend Sunday night hurriedly reading up on iptables. Still getting a lot of inbound traffic (everything is getting dropped), but thankfully no outbound now.

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