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← Back to Canonical Ubuntu 24.04 LTS Security Technical Implementation Guide

V-270803

CAT II (Medium)

Ubuntu 24.04 LTS must generate audit records for successful/unsuccessful uses of the crontab command.

Rule ID

SV-270803r1066898_rule

STIG

Canonical Ubuntu 24.04 LTS Security Technical Implementation Guide

Version

V1R5

CCIs

CCI-000172

Discussion

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).

Check Content

Verify an audit event is generated for any successful/unsuccessful use of the "crontab" command with the following command: 
 
$ sudo auditctl -l | grep -w crontab
-a always,exit -F path=/usr/bin/crontab -F perm=x -F auid>=1000 -F auid!=-1 -k privileged-crontab 
 
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" allows for specifying an arbitrary identifier, and the string after it does not need to match the example output above.

Fix Text

Configure the audit system to generate an audit event for any successful/unsuccessful uses of the "crontab" command.  
 
Add or update the following rules in the "/etc/audit/rules.d/stig.rules" file: 
 
-a always,exit -F path=/usr/bin/crontab -F perm=x -F auid>=1000 -F auid!=-1 -k privileged-crontab 
   
To reload the rules file, issue the following command: 
 
$ sudo augenrules --load