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 | CCI-000366 | 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-256553r991589_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