GNU bug report logs - #47674
dnsmasq is vulnerable to CVE-2021-3448

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From: Leo Famulari <leo <at> famulari.name>
To: Nicolò Balzarotti <anothersms <at> gmail.com>
Cc: 47674 <at> debbugs.gnu.org
Subject: bug#47674: dnsmasq is vulnerable to CVE-2021-3448
Date: Fri, 9 Apr 2021 15:33:22 -0400

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On Fri, Apr 09, 2021 at 05:10:43PM +0200, Nicolò Balzarotti wrote:
> CVE-2021-3448
> 
> A flaw was found in dnsmasq in versions before 2.85. When configured to
> use a specific server for a given network interface, dnsmasq uses a
> fixed port while forwarding queries. An attacker on the network, able to
> find the outgoing port used by dnsmasq, only needs to guess the random
> transmission ID to forge a reply and get it accepted by dnsmasq. This
> flaw makes a DNS Cache Poisoning attack much easier. The highest threat
> from this vulnerability is to data integrity.
> 
> guix ships dnsmasq <at> 2.84. guix refresh shows version 2.85 is available,
> and there are 43 dependent packages so this can go directly to master.
> 
> All dependent packages (refresh -l) build fine except for
> python2-libvirt <at> 7.2.0, which is failing also on master
> (libvirt-python requires Python >= 3.5 to build).  Since it's a python2
> package and no other packages depends on it, can we just drop it?

Yes, sounds good.

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