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Date: Tue, 13 Feb 2024 23:34:36 +0100
From: Solar Designer <>
Cc: Otto Moerbeek <>
Subject: Re: Unbound: disclosure of CVE-2023-50387 and CVE-2023-50868 DNSSEC validation vulnerabilities

It's not great that we're adding to a thread on Unbound, but since we
already started...

On Tue, Feb 13, 2024 at 10:52:09PM +0100, Solar Designer wrote:
> On Tue, Feb 13, 2024 at 12:06:42PM -0800, Alan Coopersmith wrote:
> > On 2/13/24 06:07, Yorgos Thessalonikefs wrote:
> > >DNSSEC protocol vulnerabilities have been discovered that render various
> > >DNSSEC validators victims of Denial Of Service while trying to validate
> > >specially crafted DNSSEC responses.
> > >
> > >There are two known vulnerabilities: CVE-2023-50387 (referred here as
> > >the KeyTrap vulnerability) and CVE-2023-50868 (referred here as the
> > >NSEC3 vulnerability).
> > 
> > Similarly, dnsmasq 2.90 was published today to address these:
> >
> And fixes for these two CVEs were merged into PowerDNS today:

There are also three PRs (13782, 13783, 13784) with back-ports to other
supported branches.

> I hope PowerDNS will also be sending a proper advisory in here.

Turns out there is a PowerDNS advisory here:

but really it should be posted to oss-security as well.


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