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


Finding ID Version Rule ID IA Controls Severity
V-219241 UBTU-18-010318 SV-219241r610963_rule Medium
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).
Canonical Ubuntu 18.04 LTS Security Technical Implementation Guide 2022-12-06


Check Text ( C-20966r305051_chk )
Verify if the Ubuntu operating system generates audit records when successful/unsuccessful attempts to use of the "umount" command occur.

Check the configured audit rules with the following commands:

# sudo auditctl -l | grep '/bin/umount'

-a always,exit -F path=/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-20965r305052_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=/bin/umount -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-umount

In order to reload the rules file, issue the following command:

# sudo augenrules --load

The "root" account must be used to view/edit any files in the /etc/audit/rules.d/ directory.