A Pacemaker security update has been released for Ubuntu Linux 16.04 LTS, 18.04 LTS, 20.04 LTS, and 20.10.

USN-4623-1: Pacemaker vulnerability

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Ubuntu Security Notice USN-4623-1
November 09, 2020

pacemaker vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Pacemaker could be made to run programs as an administrator.

Software Description:
- pacemaker: Cluster resource manager

Details:

Ken Gaillot discovered that Pacemaker incorrectly handled IPC
communications permissions. A local attacker could possibly use this issue
to bypass ACL restrictions and execute arbitrary code as root.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.10:
pacemaker 2.0.4-2ubuntu3.1

Ubuntu 20.04 LTS:
pacemaker 2.0.3-3ubuntu4.1

Ubuntu 18.04 LTS:
pacemaker 1.1.18-0ubuntu1.3

Ubuntu 16.04 LTS:
pacemaker 1.1.14-2ubuntu1.9

In general, a standard system update will make all the necessary changes.

References:
  https://usn.ubuntu.com/4623-1
CVE-2020-25654

Package Information:
  https://launchpad.net/ubuntu/+source/pacemaker/2.0.4-2ubuntu3.1
  https://launchpad.net/ubuntu/+source/pacemaker/2.0.3-3ubuntu4.1
  https://launchpad.net/ubuntu/+source/pacemaker/1.1.18-0ubuntu1.3
  https://launchpad.net/ubuntu/+source/pacemaker/1.1.14-2ubuntu1.9