The IDPS must ensure all encrypted traffic is visible to network monitoring tools.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
SRG-NET-000262-IDPS-NA	SRG-NET-000262-IDPS-NA	SRG-NET-000262-IDPS-NA_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. Regardless of direction, all encrypted traffic must be decrypted prior to reaching the sensor or firewall so all traffic can be monitored. This is a network architecture design requirement. Redesign the network architecture, so all ingress traffic will pass the sensor decrypted and is inspected by the firewall and Network IDS/IPS.

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. Regardless of direction, all encrypted traffic must be decrypted prior to reaching the sensor or firewall so all traffic can be monitored. This is a network architecture design requirement. Redesign the network architecture, so all ingress traffic will pass the sensor decrypted and is inspected by the firewall and Network IDS/IPS.

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

Details

Check Text ( C-43403_chk )
This requirement does not apply to IDPS.

Fix Text (F-43403_fix)
Not applicable for IDPS. No fix required.