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Date: Sun, 19 Jan 2014 12:56:42 +0100
From: Florian Weimer <>
Subject: Re: CVE-2014-0021: chrony traffic amplification in
 cmdmon protocol

On 01/17/2014 11:54 PM, Vincent Danen wrote:
> With the news about the traffic amplification issue in ntpd, one of our developers looked at chronyd and it suffers from the same flaw.
> We've filed a bug [1] and it's also been brought up upstream [2].  There is currently no fix, but as the ntpd issue has been gaining some interest, I'm bringing this up here now for other who may ship chrony.  We assigned it CVE-2014-0021.

I noticed this as well when reviewing chrony quite a while ago, but I 
did not press the issue because its restricted to localhost by default 
and the amplification factor is low, especially in packet count terms. 
At the time, I did not consider it comparable to the ntpd issue at all, 
and I still don't.

Comparable levels of amplification are present in TCP itself and many 
other UDP-based protocols.

Florian Weimer / Red Hat Product Security Team

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