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The SUSE operating system SSH daemon must encrypt forwarded remote X connections for interactive users.


Overview

Finding ID Version Rule ID IA Controls Severity
V-77473 SLES-12-030260 SV-92169r1_rule High
Description
Open X displays allow an attacker to capture keystrokes and execute commands remotely.
STIG Date
SLES 12 Security Technical Implementation Guide 2020-06-30

Details

Check Text ( C-77033r1_chk )
Verify the SUSE operating system SSH daemon remote X forwarded connections for interactive users are encrypted.

Check that SSH remote X forwarded connections are encrypted with the following command:

# sudo grep -i x11forwarding /etc/ssh/sshd_config
X11Forwarding yes

If the "X11Forwarding" keyword is set to "no", is missing, or is commented out, this is a finding.
Fix Text (F-84115r1_fix)
Configure the SUSE operating system SSH daemon to encrypt forwarded X 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