The Oracle Linux operating system must be configured so that remote X connections for interactive users are encrypted.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-221886	OL07-00-040710	SV-221886r505922_rule		High

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

STIG	Date
Oracle Linux 7 Security Technical Implementation Guide	2020-09-10

Details

Check Text ( C-23601r419730_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 \| grep -v "^#" X11Forwarding yes If the "X11Forwarding" keyword is set to "no" or is missing, this is a finding.

Fix Text (F-23590r419731_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): X11Forwarding yes The SSH service must be restarted for changes to take effect: # systemctl restart sshd

Fix Text (F-23590r419731_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):

X11Forwarding yes

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

# systemctl restart sshd