Ensure the remote access server (RAS) is located in a dual homed screened subnet.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-19833	SRC-RAP-040	SV-21996r1_rule	ECSC-1	Medium

Description
Without a screened subnet architecture traffic that would be normally destined for the DMZ would have to be redirected to the site's internal network. This would allow for a greater opportunity for hackers to exploit. NOTE: This check does not apply to the remote access VPN gateway. If an integrated RAS/VPN gateway is used where dial-up services are provided, then this check also applies. The DMZ architecture and placement will comply with the requirements of the applicable Network Infrastructure STIG.

Description

Without a screened subnet architecture traffic that would be normally destined for the DMZ would have to be redirected to the site's internal network. This would allow for a greater opportunity for hackers to exploit. NOTE: This check does not apply to the remote access VPN gateway. If an integrated RAS/VPN gateway is used where dial-up services are provided, then this check also applies. The DMZ architecture and placement will comply with the requirements of the applicable Network Infrastructure STIG.

STIG	Date
Remote Access Policy STIG	2015-09-16

Details

Check Text ( C-25056r1_chk )
Review network architecture with the network administrator. Verify compliance by inspecting the site network topology diagrams and the firewall interface configurations. Since many network diagrams are not kept up-to-date, walk through the connections with the network administrator to verify the diagrams are current. If the network device does not use an approved network isolation method (e.g., DMZ), this is a finding.

Check Text ( C-25056r1_chk )

Review network architecture with the network administrator.

Verify compliance by inspecting the site network topology diagrams and the firewall interface configurations. Since many network diagrams are not kept up-to-date, walk through the connections with the network administrator to verify the diagrams are current.

If the network device does not use an approved network isolation method (e.g., DMZ), this is a finding.

Fix Text (F-20516r1_fix)
Use the network diagram in the Network Infrastructure STIG for guidance for placement of RAS server in the appropriated DMZ subnets.