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-256514 | SRG-OS-000163-GPOS-00072 | PHTN-30-000038 | SV-256514r970703_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 ClientAliveCountMax
Expected result:
ClientAliveCountMax 0
If the output does not match the expected result, this is a finding.
✔️ 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