Title

The Red Hat Enterprise Linux operating system must be configured to allow sending email notifications of configuration changes and adverse events to designated personnel. (Cat II impact)

Discussion

Unauthorized changes to the baseline configuration could make the system vulnerable to various attacks or allow unauthorized access to the operating system. Changes to 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 operating system. The 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 the operating system is configured to allow sending email notifications. Note: The "mailx" package provides the "mail" command that is used to send email messages. Verify that the "mailx" package is installed on the system: $ sudo yum list installed mailx mailx.x86_64 12.5-19.el7 @rhel-7-server-rpms If "mailx" package is not installed, this is a finding.

Fix Text

Install the "mailx" package on the system: $ sudo yum install mailx

Additional Identifiers

Rule ID: SV-256970r902696_rule

Vulnerability ID: V-256970

Group Title: SRG-OS-000363-GPOS-00150

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.