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V-270773

CAT II (Medium)

Ubuntu 24.04 LTS must be configured so that Advance Package Tool (APT) removes all software components after updated versions have been installed.

Rule ID

SV-270773r1066808_rule

STIG

Canonical Ubuntu 24.04 LTS Security Technical Implementation Guide

Version

V1R5

CCIs

CCI-002617

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.

Check Content

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

Fix Text

Configure APT to remove all software components after updated versions have been installed. 
 
Add or update the following options to the "/etc/apt/apt.conf.d/50unattended-upgrades" file: 
 
Unattended-Upgrade::Remove-Unused-Dependencies "true"; 
Unattended-Upgrade::Remove-Unused-Kernel-Packages "true";