The IDPS must analyze outbound traffic at the external boundary of the network.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
SRG-NET-000263-IDPS-000232	SRG-NET-000263-IDPS-000232	SRG-NET-000263-IDPS-000232_rule		Medium

Description
IDPS sensors must be deployed at strategic locations within the network. At a minimum, they should be deployed within the DMZ and behind the firewall. It is important to not only monitor traffic entering the enclave but also leaving. Placing an IDS behind the firewall will provide a clear analysis of what type of traffic and potential attacks are passing through the firewall. Monitoring outbound traffic enables the network operator to detect an attack towards another network with the local enclave as the base. Monitoring outbound traffic can also detect abnormal traffic or mischievous activities by internal personnel.

Description

IDPS sensors must be deployed at strategic locations within the network. At a minimum, they should be deployed within the DMZ and behind the firewall. It is important to not only monitor traffic entering the enclave but also leaving. Placing an IDS behind the firewall will provide a clear analysis of what type of traffic and potential attacks are passing through the firewall. Monitoring outbound traffic enables the network operator to detect an attack towards another network with the local enclave as the base. Monitoring outbound traffic can also detect abnormal traffic or mischievous activities by internal personnel.

STIG	Date
IDPS Security Requirements Guide (SRG)	2012-03-08

Details

Check Text ( C-43404_chk )
Verify one or more sensors are installed to monitor outbound traffic at the external boundary of the network. If one or more sensors are not placed to monitor and analyze outbound traffic at the external boundary, this is a finding.

Fix Text (F-43404_fix)
Place an IDPS sensor on the perimeter segment to monitor outbound traffic.