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-256553r887333_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	2023-12-01

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