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V-256514

CAT II (Medium)

The Photon operating system must configure sshd to disconnect idle Secure Shell (SSH) sessions.

Rule ID

SV-256514r970703_rule

STIG

VMware vSphere 7.0 vCenter Appliance Photon OS Security Technical Implementation Guide

Version

V1R4

CCIs

CCI-001133

Discussion

Terminating an idle session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a management session enabled on a console or console port that has been left unattended.

Check Content

At the command line, run the following command:

# sshd -T|&grep -i ClientAliveCountMax

Expected result:

ClientAliveCountMax 0

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 "ClientAliveCountMax" line is uncommented and set to the following:

ClientAliveCountMax 0

At the command line, run the following command:

# systemctl restart sshd.service