AIX must turn off X11 forwarding for the SSH daemon.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-91731 | AIX7-00-002117 | SV-101829r1_rule | Medium |
| 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. |
| STIG | Date |
|---|---|
| IBM AIX 7.x Security Technical Implementation Guide | 2020-02-24 |
Details
| Check Text ( C-90885r3_chk ) |
|---|
| If X11 forwarding has been authorized for use, this is Not Applicable. Check the SSH daemon configuration for the "X11Forwarding" directive using command: # grep -i X11Forwarding /etc/ssh/sshd_config | grep -v '^#' X11Forwarding no If the setting is not present or the setting is "yes", this is a finding. |
| Fix Text (F-97929r1_fix) |
|---|
| Edit the "/etc/sshd/sshd_config" file to add the following line and save the change: X11Forwarding no Restart the SSH daemon: # stopsrc -s sshd # startsrc -s sshd |