The VPN Gateway must disable split-tunneling for remote clients VPNs.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-207243	SRG-NET-000369-VPN-001620	SV-207243r608988_rule		Medium

Description
Split tunneling would in effect allow unauthorized external connections, making the system more vulnerable to attack and to exfiltration of organizational information. A VPN hardware or software client with split tunneling enabled provides an unsecured backdoor to the enclave from the Internet. With split tunneling enabled, a remote client has access to the Internet while at the same time has established a secured path to the enclave via an IPsec tunnel. A remote client connected to the Internet that has been compromised by an attacker in the Internet, provides an attack base to the enclave’s private network via the IPsec tunnel. Hence, it is imperative that the VPN gateway enforces a no split-tunneling policy to all remote clients.

Description

Split tunneling would in effect allow unauthorized external connections, making the system more vulnerable to attack and to exfiltration of organizational information. A VPN hardware or software client with split tunneling enabled provides an unsecured backdoor to the enclave from the Internet. With split tunneling enabled, a remote client has access to the Internet while at the same time has established a secured path to the enclave via an IPsec tunnel. A remote client connected to the Internet that has been compromised by an attacker in the Internet, provides an attack base to the enclave’s private network via the IPsec tunnel. Hence, it is imperative that the VPN gateway enforces a no split-tunneling policy to all remote clients.

STIG	Date
Virtual Private Network (VPN) Security Requirements Guide	2021-03-25

Details

Check Text ( C-7503r378350_chk )
Verify the VPN Gateway disables split-tunneling for remote clients VPNs. If the VPN Gateway does not disable split-tunneling for remote clients VPNs, this is a finding.

Fix Text (F-7503r378351_fix)
Configure the VPN Gateway to disable split-tunneling for remote clients VPNs.