Date: Wed, 7 Mar 2018 11:09:50 +0100 From: Tomas Hoger <thoger@...hat.com> To: Kurt Seifried <kseifried@...hat.com> Cc: oss-security@...ts.openwall.com Subject: Re: memcached UDP amplification attacks On Fri, 2 Mar 2018 21:42:30 -0700 Kurt Seifried wrote: > I have assigned CVE-2018-1000115 to this issue: > > Memcached version 1.5.5 contains an Insufficient Control of Network > Message Volume (Network Amplification, CWE-406) vulnerability in the > UDP support of the memcached server that can result in denial of > service via network flood (traffic amplification of 1:50,000 has been > reported by reliable sources). This attack appear to be exploitable > via network connectivity to port 11211 UDP. This vulnerability > appears to have been fixed in 1.5.6 due to the disabling of the UDP > protocol by default. Minor nitpick, the description mentions 1:50,000 ratio, apparently based on the information in the following reference: > https://blogs.akamai.com/2018/03/memcached-fueled-13-tbps-attacks.html where it's mentioned as: """ Worse, memcached can have an amplification factor of over 50,000, meaning a 203 byte request results in a 100 megabyte response. """ However, 200 * 50k = 10m, not 100m. Wonder if I'm doing my math wrong. -- Tomas Hoger / Red Hat Product Security
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