cyberstrikeus 5.1.6 Ensure SSH X11 forwarding is disabled (Automated)
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 Procedure
Run the following command and verify that output matches:
# sshd -T | grep x11forwarding
X11Forwarding no
Expected Result
Output should show X11Forwarding no.
Remediation
Edit the /etc/ssh/sshd_config file to set the parameter as follows:
X11Forwarding no
CIS Controls
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|---|---|---|---|
| v8 | 4.4 Implement and Manage a Firewall on Servers | x | x | x |
| v8 | 4.5 Implement and Manage a Firewall on End-User Devices | x | x | x |
| v7 | 9.2 Ensure Only Approved Ports, Protocols and Services Are Running | x | x |
Profile
- Level 1 - Server