Title

The operating system must notify designated personnel if baseline configurations are changed in an unauthorized manner. (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. Satisfies: SRG-OS-000363-GPOS-00150

Check Content

Verify the operating system notifies designated personnel if baseline configurations are changed in an unauthorized manner. If it does not, this is a finding. AIDE is one tool that may be used to check this. To see if AIDE is installed: # pkg info aide aide-0.16 Name : aide Version : 0.16 Installed on : Tue Mar 27 09:56:37 2018 UTC Origin : security/aide Architecture : FreeBSD:10:amd64 Prefix : /usr/local Categories : security Licenses : Maintainer : cy@FreeBSD.org WWW : https://sourceforge.net/projects/aide/ Comment : Replacement and extension for Tripwire Annotations : repo_type : binary repository : FreeBSD Flat size : 1.31MiB Description : AIDE is Advanced Intrusion Detection Environment. This piece of software was written as a replacement and extension for Tripwire. WWW: https://sourceforge.net/projects/aide/ If AIDE is not installed, pkg will say "No package(s) matching aide." To see if it runs periodically: $ cat /etc/crontab $ ls /etc/cron.d/* One of these may indicate that AIDE is being run. Other auditing software is available, such as Tripwire. Ask the system adminitrator if they are using an alternative system.

Fix Text

Configure the operating system to notify designated personnel if baseline configurations are changed in an unauthorized manner.

Additional Identifiers

Rule ID:

Vulnerability ID: V-1500

Group Title:

Expert Comments

CCIs tied to check.

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