| Dmitry Teselkin | e9420e7 | 2018-04-03 13:49:39 +0300 | [diff] [blame] | 1 | # 5.2.4 Ensure SSH X11 forwarding is disabled (Scored) |
| 2 | # |
| 3 | # Profile Applicability |
| 4 | # --------------------- |
| 5 | # - Level 1 - Server |
| 6 | # - Level 1 - Workstation |
| 7 | # |
| 8 | # Description |
| 9 | # ----------- |
| 10 | # The X11Forwarding parameter provides the ability to tunnel X11 traffic through the |
| 11 | # connection to enable remote graphic connections. |
| 12 | # |
| 13 | # Rationale |
| 14 | # --------- |
| 15 | # Disable X11 forwarding unless there is an operational requirement to use X11 applications |
| 16 | # directly. There is a small risk that the remote X11 servers of users who are logged in via |
| 17 | # SSH with X11 forwarding could be compromised by other users on the X11 server. Note |
| 18 | # that even if X11 forwarding is disabled, users can always install their own forwarders. |
| 19 | # |
| 20 | # Audit |
| 21 | # ----- |
| 22 | # Run the following command and verify that output matches: |
| 23 | # |
| 24 | # # grep "^X11Forwarding" /etc/ssh/sshd_config |
| 25 | # X11Forwarding no |
| 26 | # |
| 27 | # Remediation |
| 28 | # ----------- |
| 29 | # Edit the /etc/ssh/sshd_config file to set the parameter as follows: |
| 30 | # |
| 31 | # X11Forwarding no |
| 32 | |
| 33 | parameters: |
| 34 | openssh: |
| 35 | server: |
| 36 | x11: |
| 37 | forwarding: False |
| 38 | |