Common Controls Hub
The Photon operating system must configure Secure Shell (SSH) to disallow compression of the encrypted session stream.
If compression is allowed in an SSH connection prior to authentication, vulnerabilities in the compression software could result in compromise of the system from an unauthenticated connection.
VMware vSphere 8.0 vCenter Appliance Photon OS 4.0 Security Technical Implementation Guide
Check Text ( C-62618r933693_chk )
At the command line, run the following command to verify the running configuration of sshd:
# sshd -T|&grep -i Compression
If there is no output or if "Compression" is not set to "delayed" or "no", this is a finding.
Fix Text (F-62527r933694_fix)
Navigate to and open:
Ensure the "Compression" line is uncommented and set to the following:
At the command line, run the following command:
# systemctl restart sshd.service