Ubuntu 22.04 LTS must generate audit records when successful/unsuccessful attempts to modify the /etc/sudoers file occur.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-260646	UBTU-22-654220	SV-260646r991575_rule		Medium

Description
Without generating audit records 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 22.04 LTS Security Technical Implementation Guide	2024-05-30

Details

Check Text ( C-64375r953749_chk )
Verify Ubuntu 22.04 LTS generates audit records for all modifications that affect "/etc/sudoers" by using the following command: $ sudo auditctl -l \| grep sudoers -w /etc/sudoers -p wa -k privilege_modification If the command does not return a line that matches the example or the line is commented out, this is a finding. Note: The "-k" value is arbitrary and can be different from the example output above.

Check Text ( C-64375r953749_chk )

Verify Ubuntu 22.04 LTS generates audit records for all modifications that affect "/etc/sudoers" by using the following command:

$ sudo auditctl -l | grep sudoers
-w /etc/sudoers -p wa -k privilege_modification

If the command does not return a line that matches the example or the line is commented out, this is a finding.

Note: The "-k" value is arbitrary and can be different from the example output above.

Fix Text (F-64283r953750_fix)
Configure Ubuntu 22.04 LTS to generate audit records for all modifications that affect "/etc/sudoers". Add or modify the following line to "/etc/audit/rules.d/stig.rules": -w /etc/sudoers -p wa -k privilege_modification To reload the rules file, issue the following command: $ sudo augenrules --load Note: The "-k " at the end of the line gives the rule a unique meaning to help during an audit investigation. The does not need to match the example above.

Fix Text (F-64283r953750_fix)

Configure Ubuntu 22.04 LTS to generate audit records for all modifications that affect "/etc/sudoers".

Add or modify the following line to "/etc/audit/rules.d/stig.rules":

-w /etc/sudoers -p wa -k privilege_modification

To reload the rules file, issue the following command:

$ sudo augenrules --load

Note: The "-k " at the end of the line gives the rule a unique meaning to help during an audit investigation. The does not need to match the example above.