GNU bug report logs - #47627
syncthing package is vulnerable to CVE-2021-21404

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Leo Famulari <leo <at> famulari.name>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#47627: closed (syncthing package is vulnerable to CVE-2021-21404)
Date: Mon, 12 Apr 2021 01:56:01 +0000

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Your message dated Sun, 11 Apr 2021 21:54:55 -0400
with message-id <YHOobxPF9OMoiv7C <at> jasmine.lan>
and subject line Re: bug#47627: syncthing package is vulnerable to CVE-2021-21404
has caused the debbugs.gnu.org bug report #47627,
regarding syncthing package is vulnerable to CVE-2021-21404
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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From: Léo Le Bouter <lle-bout <at> zaclys.net>
To: bug-guix <at> gnu.org
Subject: syncthing package is vulnerable to CVE-2021-21404
Date: Wed, 07 Apr 2021 00:40:03 +0200

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CVE-2021-21404	06.04.21 22:15
Syncthing is a continuous file synchronization program. In Syncthing
before version 1.15.0, the relay server `strelaysrv` can be caused to
crash and exit by sending a relay message with a negative length field.
Similarly, Syncthing itself can crash for the same reason if given a
malformed message from a malicious relay server when attempting to join
the relay. Relay joins are essentially random (from a subset of low
latency relays) and Syncthing will by default restart when crashing, at
which point it's likely to pick another non-malicious relay. This flaw
is fixed in version 1.15.0.

We still ship 1.5.0, we crucially need to update that *very* useful
networked daemon package. With the new go importer maybe that's easier.
Also work in the go build system needs to happen IIRC.

Previous discussion about updating syncthing: 
https://issues.guix.gnu.org/45476

Léo

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From: Leo Famulari <leo <at> famulari.name>
To: Léo Le Bouter <lle-bout <at> zaclys.net>
Cc: 47627-done <at> debbugs.gnu.org
Subject: Re: bug#47627: syncthing package is vulnerable to CVE-2021-21404
Date: Sun, 11 Apr 2021 21:54:55 -0400

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On Mon, Apr 12, 2021 at 02:27:51AM +0200, Léo Le Bouter wrote:
> On Thu, 2021-04-08 at 20:01 -0400, Leo Famulari wrote:
> > On Tue, Apr 06, 2021 at 06:51:47PM -0400, Leo Famulari wrote:
> > > Yeah. Given this report, we could also just build Syncthing with
> > > the
> > > bundled source code, which is freely licensed.
> > 
> > I've attached the patch.
> 
> I tested this patch on my system, works great with the syncthing
> service also. LGTM from me.

Thanks for the review. Pushed as
ed3ef756f521a0df8596a88b66f65b7a1ad99252

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