The Photon operating system must configure sshd to disconnect idle Secure Shell (SSH) sessions.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-256514 | PHTN-30-000038 | SV-256514r970703_rule | CCI-001133 | medium |
| Description | ||||
| 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. | ||||
| STIG | Date | |||
| VMware vSphere 7.0 vCenter Appliance Photon OS Security Technical Implementation Guide | 2024-12-16 | |||
Details
Check Text (C-256514r970703_chk)
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 (F-60132r887215_fix)
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