A pacemaker security update has been released for Debian GNU/Linux 9 LTS to address an ACL bypass flaw in pacemaker.

DLA 2447-1: pacemaker security update

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Debian LTS Advisory DLA-2447-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Markus Koschany
November 11, 2020   https://wiki.debian.org/LTS
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Package : pacemaker
Version : 1.1.16-1+deb9u1
CVE ID : CVE-2020-25654
Debian Bug : 973254

An ACL bypass flaw was found in pacemaker, a cluster resource manager.
An attacker having a local account on the cluster and in the haclient group
could use IPC communication with various daemons directly to perform certain tasks that they would be prevented by ACLs from doing if they went through the configuration.

For Debian 9 stretch, this problem has been fixed in version
1.1.16-1+deb9u1.

We recommend that you upgrade your pacemaker packages.

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

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