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The Ubuntu operating system must have system commands owned by root or a system account.


Finding ID Version Rule ID IA Controls Severity
V-238377 UBTU-20-010457 SV-238377r832968_rule Medium
If the Ubuntu operating system were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that are part of a robust change management process. This requirement applies to Ubuntu operating systems with software libraries that are accessible and configurable, as in the case of interpreted languages. Software libraries also include privileged programs which execute with escalated privileges. Only qualified and authorized individuals must be allowed to obtain access to information system components for purposes of initiating changes, including upgrades and modifications.
Canonical Ubuntu 20.04 LTS Security Technical Implementation Guide 2022-12-06


Check Text ( C-41587r832966_chk )
Verify the system commands contained in the following directories are owned by root, or a required system account:


Use the following command for the check:

$ sudo find /bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin ! -user root -type f -exec stat -c "%n %U" '{}' \;

If any system commands are returned and are not owned by a required system account, this is a finding.
Fix Text (F-41546r832967_fix)
Configure the system commands and their respective parent directories to be protected from unauthorized access. Run the following command, replacing "[FILE]" with any system command file not owned by "root" or a required system account:

$ sudo chown root [FILE]