OL 9 must remove all software components after updated versions have been installed.

Previous versions of software components that are not removed from the information system after updates have been installed may be exploited by some adversaries.

Verify that OL 9 removes all software components after updated versions have been installed with the following command:

$ grep clean /etc/dnf/dnf.conf clean_requirements_on_remove=True

If clean_requirements_on_remove is not set to "True", this is a finding.

Configure OL 9 to remove all software components after updated versions have been installed.

Edit the file /etc/dnf/dnf.conf by adding or editing the following line:

clean_requirements_on_remove=1