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Message-ID: <20180307110950.4eb041a8@redhat.com>
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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