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Date: Sat, 8 Jul 2017 14:40:16 +0200
From: Salvatore Bonaccorso <>
Subject: Re: CVE for the TSIG issue in knot?


On Sat, Jun 24, 2017 at 02:28:20PM +0200, Solar Designer wrote:
> On Sat, Jun 24, 2017 at 01:58:23PM +0200, Yves-Alexis Perez wrote:
> > I noticed the recent issue in knot with TSIG bypass
> > (
> Is is inappropriate to post only a link in here.  In cases like this,
> please also quote at least the most essential portion of the content
> you're referring to, which is:
> "CZ.NIC has released Knot DNS 2.5.2 and Knot DNS 2.4.5. Beside
> several fixes and improvements, these versions fix a flaw within the
> TSIG protocol implementation that would allow an attacker with a
> valid key name and algorithm to bypass the TSIG authentication if no
> additional ACL restrictions is set. This vulnerability was
> discovered by security experts from Synacktiv.  Special thanks to
> them!"

FTR, this issue has been assigned CVE-2017-11104.


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