Ubuntu 22.04 LTS must be configured so that the Advance Package Tool (APT) removes all software components after updated versions have been installed.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-260477	UBTU-22-214015	SV-260477r953244_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 22.04 LTS Security Technical Implementation Guide	2024-03-21

Details

Check Text ( C-64206r953242_chk )
Verify APT is configured to remove all software components after updated versions have been installed by using the following command: $ grep -i remove-unused /etc/apt/apt.conf.d/50-unattended-upgrades Unattended-Upgrade::Remove-Unused-Kernel-Packages "true"; Unattended-Upgrade::Remove-Unused-Dependencies "true"; If "Unattended-Upgrade::Remove-Unused-Kernel-Packages" and "Unattended-Upgrade::Remove-Unused-Dependencies" are not set to "true", are commented out, or are missing, this is a finding.

Check Text ( C-64206r953242_chk )

Verify APT is configured to remove all software components after updated versions have been installed by using the following command:

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

If "Unattended-Upgrade::Remove-Unused-Kernel-Packages" and "Unattended-Upgrade::Remove-Unused-Dependencies" are not set to "true", are commented out, or are missing, this is a finding.

Fix Text (F-64114r953243_fix)
Configure APT to remove all software components after updated versions have been installed. Add or modify the following lines in the "/etc/apt/apt.conf.d/50-unattended-upgrades" file: Unattended-Upgrade::Remove-Unused-Kernel-Packages "true"; Unattended-Upgrade::Remove-Unused-Dependencies "true";