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V-256553

CAT II (Medium)

The Photon operating system must configure sshd to disallow compression of the encrypted session stream.

Rule ID

SV-256553r991589_rule

STIG

VMware vSphere 7.0 vCenter Appliance Photon OS Security Technical Implementation Guide

Version

V1R4

CCIs

CCI-000366

Discussion

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.

Check Content

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

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