| # 5.2.4 Ensure SSH X11 forwarding is disabled (Scored) |
| # |
| # Profile Applicability |
| # --------------------- |
| # - Level 1 - Server |
| # - Level 1 - Workstation |
| # |
| # Description |
| # ----------- |
| # The X11Forwarding parameter provides the ability to tunnel X11 traffic through the |
| # connection to enable remote graphic connections. |
| # |
| # Rationale |
| # --------- |
| # Disable X11 forwarding unless there is an operational requirement to use X11 applications |
| # directly. There is a small risk that the remote X11 servers of users who are logged in via |
| # SSH with X11 forwarding could be compromised by other users on the X11 server. Note |
| # that even if X11 forwarding is disabled, users can always install their own forwarders. |
| # |
| # Audit |
| # ----- |
| # Run the following command and verify that output matches: |
| # |
| # # grep "^X11Forwarding" /etc/ssh/sshd_config |
| # X11Forwarding no |
| # |
| # Remediation |
| # ----------- |
| # Edit the /etc/ssh/sshd_config file to set the parameter as follows: |
| # |
| # X11Forwarding no |
| |
| parameters: |
| openssh: |
| server: |
| x11: |
| forwarding: False |
| |