← Back to Canonical Ubuntu 20.04 LTS Security Technical Implementation Guide

V-238372

CAT II (Medium)

The Ubuntu operating system must notify designated personnel if baseline configurations are changed in an unauthorized manner. The file integrity tool must notify the System Administrator when changes to the baseline configuration or anomalies in the operation of any security functions are discovered.

Rule ID

SV-238372r958948_rule

STIG

Canonical Ubuntu 20.04 LTS Security Technical Implementation Guide

Version

V2R4

CCIs

CCI-002702

Discussion

Unauthorized changes to the baseline configuration could make the system vulnerable to various attacks or allow unauthorized access to the Ubuntu operating system. Changes to Ubuntu operating system configurations can have unintended side effects, some of which may be relevant to security. Detecting such changes and providing an automated response can help avoid unintended, negative consequences that could ultimately affect the security state of the Ubuntu operating system. The Ubuntu operating system's IMO/ISSO and SAs must be notified via email and/or monitoring system trap when there is an unauthorized modification of a configuration item.

Check Content

Verify that Advanced Intrusion Detection Environment (AIDE) notifies the System Administrator
 when anomalies in the operation of any security functions are discovered with the following command: 
 
$ sudo grep SILENTREPORTS /etc/default/aide 
 
SILENTREPORTS=no 
 
If SILENTREPORTS is uncommented and set to "yes", this is a finding.

Fix Text

Configure the Ubuntu operating system to notify designated personnel if baseline configurations are changed in an unauthorized manner. 
 
Modify the "SILENTREPORTS" parameter in the "/etc/default/aide" file with a value of "no" if it does not already exist.