Vulnerability Discussion

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

Check

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.

Fix

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