The system must not have unauthorized IP tunnels configured.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-72317	RHEL-07-040820	SV-86941r1_rule		Medium

Description
IP tunneling mechanisms can be used to bypass network filtering. If tunneling is required, it must be documented with the Information System Security Officer (ISSO).

STIG	Date
Red Hat Enterprise Linux 7 Security Technical Implementation Guide	2017-07-08

Details

Check Text ( C-72551r1_chk )
Verify the system does not have unauthorized IP tunnels configured. Check to see if "libreswan" is installed with the following command: # yum list installed libreswan openswan-2.6.32-27.el6.x86_64 If "libreswan" is installed, check to see if the "IPsec" service is active with the following command: # systemctl status ipsec ipsec.service - Internet Key Exchange (IKE) Protocol Daemon for IPsec Loaded: loaded (/usr/lib/systemd/system/ipsec.service; disabled) Active: inactive (dead) If the "IPsec" service is active, check to see if any tunnels are configured in "/etc/ipsec.conf" and "/etc/ipsec.d/" with the following commands: # grep -i conn /etc/ipsec.conf conn mytunnel # grep -i conn /etc/ipsec.d/*.conf conn mytunnel If there are indications that a "conn" parameter is configured for a tunnel, ask the System Administrator if the tunnel is documented with the ISSO. If "libreswan" is installed, "IPsec" is active, and an undocumented tunnel is active, this is a finding.

Check Text ( C-72551r1_chk )

Verify the system does not have unauthorized IP tunnels configured.

Check to see if "libreswan" is installed with the following command:

# yum list installed libreswan
openswan-2.6.32-27.el6.x86_64

If "libreswan" is installed, check to see if the "IPsec" service is active with the following command:

# systemctl status ipsec
ipsec.service - Internet Key Exchange (IKE) Protocol Daemon for IPsec
Loaded: loaded (/usr/lib/systemd/system/ipsec.service; disabled)
Active: inactive (dead)

If the "IPsec" service is active, check to see if any tunnels are configured in "/etc/ipsec.conf" and "/etc/ipsec.d/" with the following commands:

# grep -i conn /etc/ipsec.conf
conn mytunnel

# grep -i conn /etc/ipsec.d/*.conf
conn mytunnel

If there are indications that a "conn" parameter is configured for a tunnel, ask the System Administrator if the tunnel is documented with the ISSO. If "libreswan" is installed, "IPsec" is active, and an undocumented tunnel is active, this is a finding.

Fix Text (F-78671r1_fix)
Remove all unapproved tunnels from the system, or document them with the ISSO.