AIX must turn off X11 forwarding for the SSH daemon.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-215300 | AIX7-00-002117 | SV-215300r991589_rule | CCI-000366 | 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 | 2024-08-16 | |||
Details
Check Text (C-215300r991589_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-16496r294352_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