Advance package Tool (APT) must remove all software components after updated versions have been installed.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-75529	UBTU-16-010570	SV-90209r1_rule		Medium

Description
Previous versions of software components that are not removed from the information system after updates have been installed may be exploited by adversaries. Some information technology products may remove older versions of software automatically from the information system.

STIG	Date
Canonical Ubuntu 16.04 Security Technical Implementation Guide	2019-12-23

Details

Check Text ( C-75233r1_chk )
Verify Advance package Tool (APT) is configured to remove all software components after updated versions have been installed. Check that APT is configured to remove all software components after updating with the following command: # grep -i remove-unused /etc/apt/apt.conf.d/50unattended-upgrades Unattended-Upgrade::Remove-Unused-Dependencies "true"; If the "Remove-Unused-Dependencies" parameter is not set to "true", or is missing, this is a finding.

Check Text ( C-75233r1_chk )

Verify Advance package Tool (APT) is configured to remove all software components after updated versions have been installed.

Check that APT is configured to remove all software components after updating with the following command:

# grep -i remove-unused /etc/apt/apt.conf.d/50unattended-upgrades
Unattended-Upgrade::Remove-Unused-Dependencies "true";

If the "Remove-Unused-Dependencies" parameter is not set to "true", or is missing, this is a finding.

Fix Text (F-82157r1_fix)
Configure APT to remove all software components after updated versions have been installed. Add or updated the following option to the "/etc/apt/apt.conf.d/50unattended-upgrades" file: Unattended-Upgrade::Remove-Unused-Dependencies "true";