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

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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