A csync2 security update has been released for Debian GNU/Linux 9 LTS to address an issue where csync2 is not correctly checking for the return value from GnuTLS security routines.

DLA 2515-1: csync2 security update

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Debian LTS Advisory DLA-2515-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Chris Lamb
January 04, 2021   https://wiki.debian.org/LTS
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Package : csync2
Version : 2.0-8-g175a01c-4+deb9u2
CVE ID : CVE-2019-15523

It was discovered that csync2, a cluster synchronization tool, did
not correctly check for the return value from GnuTLS security
routines. It neglected to repeatedly call this function as required
by the design of the API.

For Debian 9 "Stretch", this problem has been fixed in version
2.0-8-g175a01c-4+deb9u2.

We recommend that you upgrade your csync2 packages.

For the detailed security status of csync2 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/csync2

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS