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UBTU-22-214015 Ubuntu 22.04 LTS must be configured so that the Advance Package Tool (APT) removes all software components after updated versions have been installed.

DISA STIG library V2R10
All changes in this version
first version loaded CAT II

Maps to SI-2(6) via CCI-002617

Title

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

Control

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/50unattended-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.

Discussion

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.

Related controls

CCI-002617

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/50unattended-upgrades" file: Unattended-Upgrade::Remove-Unused-Kernel-Packages "true"; Unattended-Upgrade::Remove-Unused-Dependencies "true";