A Rsyslog security update has been released for Ubuntu Linux 18.04 LTS, 20.04 LTS, 21.10, and 22.04 LTS.

USN-5404-1: Rsyslog vulnerability

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Ubuntu Security Notice USN-5404-1
May 05, 2022

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

- Ubuntu 22.04 LTS
- Ubuntu 21.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Rsyslog could be made to crash if it received a specially crafted request.

Software Description:
- rsyslog: Enhanced syslogd

Details:

Pieter Agten discovered that Rsyslog incorrectly handled certain requests.
An attacker could possibly use this issue to cause a crash.

Update instructions:

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

Ubuntu 22.04 LTS:
rsyslog 8.2112.0-2ubuntu2.2

Ubuntu 21.10:
rsyslog 8.2102.0-2ubuntu2.2

Ubuntu 20.04 LTS:
rsyslog 8.2001.0-1ubuntu1.3

Ubuntu 18.04 LTS:
rsyslog 8.32.0-1ubuntu4.2

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

References:
  https://ubuntu.com/security/notices/USN-5404-1
CVE-2022-24903

Package Information:
  https://launchpad.net/ubuntu/+source/rsyslog/8.2112.0-2ubuntu2.2
  https://launchpad.net/ubuntu/+source/rsyslog/8.2102.0-2ubuntu2.2
  https://launchpad.net/ubuntu/+source/rsyslog/8.2001.0-1ubuntu1.3
  https://launchpad.net/ubuntu/+source/rsyslog/8.32.0-1ubuntu4.2