TOSS 5 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 adversaries.

Verify TOSS 5 removes all software components after updated versions have been installed using the following command:

$ grep clean /etc/dnf/dnf.conf 

clean_requirements_on_remove=1

If "clean_requirements_on_remove" is not set to "1", this is a finding.

Configure TOSS 5 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