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V-260477

CAT II (Medium)

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

Rule ID

SV-260477r1044773_rule

STIG

Canonical Ubuntu 22.04 LTS Security Technical Implementation Guide

Version

V2R8

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 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.

Fix Text

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";