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The Photon operating system must configure sshd to disable X11 forwarding.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-239156 | PHTN-67-000085 | SV-239156r675276_rule | Medium |
| Description |
|---|
| X11 is an older, insecure graphics forwarding protocol. It is not used by Photon and should be disabled as a general best practice to limit attack surface area and communication channels. |
| STIG | Date |
|---|---|
| VMware vSphere 6.7 Photon OS Security Technical Implementation Guide | 2021-04-15 |
Details
| Check Text ( C-42367r675274_chk ) |
|---|
| At the command line, execute the following command: # sshd -T|&grep -i X11Forwarding Expected result: X11Forwarding no If the output does not match the expected result, this is a finding. |
| Fix Text (F-42326r675275_fix) |
|---|
| Open /etc/ssh/sshd_config with a text editor. Ensure that the "X11Forwarding" line is uncommented and set to the following: X11Forwarding no At the command line, execute the following command: # service sshd reload |