Check: UBTU-20-010449
Canonical Ubuntu 20.04 LTS STIG:
UBTU-20-010449
(in versions v1 r12 through v1 r1)
Title
The Ubuntu operating system must be configured so that Advance Package Tool (APT) removes all software components after updated versions have been installed. (Cat II impact)
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 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" or are missing or commented out, this is a finding.
Fix Text
Configure APT to remove all software components after updated versions have been installed. Add or updated 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";
Additional Identifiers
Rule ID: SV-238370r853447_rule
Vulnerability ID: V-238370
Group Title: SRG-OS-000437-GPOS-00194
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-002617 |
The organization removes organization-defined software components (e.g., previous versions) after updated versions have been installed. |
Controls
Number | Title |
---|---|
SI-2 (6) |
Removal Of Previous Versions Of Software / Firmware |