The Photon operating system must configure sshd to disconnect idle Secure Shell (SSH) sessions.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-256513 | SRG-OS-000163-GPOS-00072 | PHTN-30-000037 | SV-256513r970703_rule | 2024-12-16 | 1 |
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.
ℹ️ Check
At the command line, run the following command:
# sshd -T|&grep -i ClientAliveInterval
Expected result:
ClientAliveInterval 900
If the output does not match the expected result, this is a finding.
✔️ Fix
Navigate to and open:
/etc/ssh/sshd_config
Ensure the "ClientAliveInterval" line is uncommented and set to the following:
ClientAliveInterval 900
At the command line, run the following command:
# systemctl restart sshd.service