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

From SLES 12 Security Technical Implementation Guide

Associated with: CCI-000366

SV-92169r1_rule The SUSE operating system SSH daemon must encrypt forwarded remote X connections for interactive users.

Vulnerability discussion

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

Check content

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

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

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