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The Ubuntu operating system must have directories that contain system commands group-owned by root.


Finding ID Version Rule ID IA Controls Severity
V-238346 UBTU-20-010425 SV-238346r654213_rule Medium
Protecting audit information also includes identifying and protecting the tools used to view and manipulate log data. Therefore, protecting audit tools is necessary to prevent unauthorized operation on audit information. Operating systems providing tools to interface with audit information will leverage user permissions and roles identifying the user accessing the tools and the corresponding rights the user has in order to make access decisions regarding the deletion of audit tools. Audit tools include, but are not limited to, vendor-provided and open source audit tools needed to successfully view and manipulate audit information system activity and records. Audit tools include custom queries and report generators.
Canonical Ubuntu 20.04 LTS Security Technical Implementation Guide 2021-11-19


Check Text ( C-41556r654211_chk )
Verify the system commands directories are group-owned by root:


Run the check with the following command:

$ sudo find /bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin ! -group root -type d -exec stat -c "%n %G" '{}' \;

If any system commands directories are returned that are not Set Group ID up on execution (SGID) files and owned by a privileged account, this is a finding.
Fix Text (F-41515r654212_fix)
Configure the system commands directories to be protected from unauthorized access. Run the following command:

$ sudo find /bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin ! -group root -type d -exec chgrp root '{}' \;