A KAuth security update has been released for Ubuntu Linux 16.04 ESM and 18.04 ESM.

USN-6035-1: KAuth vulnerability

=========================================================================
Ubuntu Security Notice USN-6035-1
April 20, 2023

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

- Ubuntu 18.04 ESM
- Ubuntu 16.04 ESM

Summary:

KAuth could be made to crash or run programs if it received specially crafted
input.

Software Description:
- kauth: Abstraction to system policy and authentication features

Details:

It was discovered that KAuth incorrectly handled some configuration parameters
with specially crafted arbitrary types. An attacker could possibly use this
issue to cause a denial of service, or possibly execute arbitrary code.

Update instructions:

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

Ubuntu 18.04 ESM:
libkf5auth-data 5.44.0-0ubuntu1+esm1
libkf5auth5 5.44.0-0ubuntu1+esm1

Ubuntu 16.04 ESM:
libkf5auth-data 5.18.0-0ubuntu2+esm1
libkf5auth5 5.18.0-0ubuntu2+esm1

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

References:
  https://ubuntu.com/security/notices/USN-6035-1
CVE-2019-7443