Remote X connections for interactive users must be encrypted.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-72303	RHEL-07-040710	SV-86927r2_rule		High

Description
Open X displays allow an attacker to capture keystrokes and execute commands remotely.

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

Details

Check Text ( C-72537r3_chk )
Verify remote X connections for interactive users are encrypted. Check that remote X connections are encrypted with the following command: # grep -i x11forwarding /etc/ssh/sshd_config X11Fowarding yes If the "X11Forwarding" keyword is set to "no", is missing, or is commented out, this is a finding.

Fix Text (F-78657r4_fix)
Configure SSH to encrypt connections for interactive users. Edit the "/etc/ssh/sshd_config" file to uncomment or add the line for the "X11Forwarding" keyword and set its value to "yes" (this file may be named differently or be in a different location if using a version of SSH that is provided by a third-party vendor): X11Fowarding yes The SSH service must be restarted for changes to take effect.

Fix Text (F-78657r4_fix)

Configure SSH to encrypt connections for interactive users.

Edit the "/etc/ssh/sshd_config" file to uncomment or add the line for the "X11Forwarding" keyword and set its value to "yes" (this file may be named differently or be in a different location if using a version of SSH that is provided by a third-party vendor):

X11Fowarding yes

The SSH service must be restarted for changes to take effect.