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

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From: Léo Le Bouter <lle-bout <at> zaclys.net>
To: 47627 <at> debbugs.gnu.org
Subject: bug#47627: 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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