The Photon operating system must configure sshd to disallow compression of the encrypted session stream.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-256553 | PHTN-30-000084 | SV-256553r991589_rule | Medium |
| Description |
| If compression is allowed in a Secure Shell (SSH) connection prior to authentication, vulnerabilities in the compression software could result in compromise of the system from an unauthenticated connection. |
| STIG | Date |
| VMware vSphere 7.0 vCenter Appliance Photon OS Security Technical Implementation Guide | 2024-12-16 |
Details
| Check Text (C-60228r887331_chk) |
| At the command line, run the following command: # sshd -T|&grep -i Compression Expected result: Compression no If the output does not match the expected result, this is a finding. |
| Fix Text (F-60171r887332_fix) |
| Navigate to and open: /etc/ssh/sshd_config Ensure the "Compression" line is uncommented and set to the following: Compression no At the command line, run the following command: # systemctl restart sshd.service |