The IDPS must enforce information flow control using organizationally defined security policy filters as a basis for flow control decisions.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-34502	SRG-NET-000033-IDPS-00032	SV-45327r1_rule		Medium

Description

Information flow control regulates where information is allowed to travel within a network and between interconnected networks. The flow of all network traffic must be monitored and controlled, so it does not introduce any unacceptable risk to the network infrastructure or data. Restrictions can be enforced based on source and destination IP addresses, as well as the ports and services being requested using security policy filters. This functionality is usually a firewall function; however, new generations of IPS devices are capable of performing this function. This control is applicable to IPS installations because it requires the enforcement (rather than just monitoring) of traffic flows.

STIG	Date
Intrusion Detection and Prevention Systems (IDPS) Security Requirements Guide	2012-11-19

Details

Check Text ( C-42676r1_chk )
If this is an IDS only implementation, this is not a finding. Examine the network configuration on the sensors. Verify restrictions are based on security filters, such as source and destination IP, application or services used as a basis for information flow. If non-explicit items like server name or MAC addresses are used for information flow control, this is a finding.

Fix Text (F-38724r1_fix)
Configure the IPS to enforce information flow control based on IP address or port/service used.