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The SSH client must be configured to not allow X11 forwarding.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-22469 | GEN005520 | SV-26762r1_rule | ECSC-1 | Low |
| Description |
|---|
| X11 forwarding over SSH allows for the secure remote execution of X11-based applications. This feature can increase the attack surface of an SSH connection and should not be enabled unless needed. If this function is necessary to support a valid mission requirement, its use must be authorized and approved in the system accreditation package. |
| STIG | Date |
|---|---|
| UNIX SRG | 2013-03-26 |
Details
| Check Text ( C-27771r1_chk ) |
|---|
| Check the SSH client configuration for the X11 forwarding setting. # grep -i ForwardX11 /etc/ssh/ssh_config | grep -v '^#' If no lines are returned, or the returned setting has a value evaluating to yes, this is a finding. |
| Fix Text (F-24012r1_fix) |
|---|
| Edit the SSH client configuration and change or add the ForwardX11 setting to no. |