The Ubuntu operating system must generate audit records for successful/unsuccessful uses of the umount command.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-238255	UBTU-20-010139	SV-238255r653940_rule		Medium

Description
Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter).

STIG	Date
Canonical Ubuntu 20.04 LTS Security Technical Implementation Guide	2021-11-19

Details

Check Text ( C-41465r653938_chk )
Verify if the Ubuntu operating system generates audit records upon successful/unsuccessful attempts to use the "umount" command. Check the configured audit rules with the following commands: $ sudo auditctl -l \| grep '/usr/bin/umount' -a always,exit -F path=/usr/bin/umount -F perm=x -F auid>=1000 -F auid!=-1 -k privileged-umount If the command does not return lines that match the example or the lines are commented out, this is a finding. Note: The "-k" allows for specifying an arbitrary identifier, and the string after it does not need to match the example output above.

Check Text ( C-41465r653938_chk )

Verify if the Ubuntu operating system generates audit records upon successful/unsuccessful attempts to use the "umount" command.

Check the configured audit rules with the following commands:

$ sudo auditctl -l | grep '/usr/bin/umount'

-a always,exit -F path=/usr/bin/umount -F perm=x -F auid>=1000 -F auid!=-1 -k privileged-umount

If the command does not return lines that match the example or the lines are commented out, this is a finding.

Note: The "-k" allows for specifying an arbitrary identifier, and the string after it does not need to match the example output above.

Fix Text (F-41424r653939_fix)
Configure the audit system to generate an audit event for any successful/unsuccessful use of the "umount" command. Add or update the following rules in the "/etc/audit/rules.d/stig.rules" file: -a always,exit -F path=/usr/bin/umount -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-umount To reload the rules file, issue the following command: $ sudo augenrules --load