STIGQter: STIG Summary: Cloud Linux AlmaLinux OS 9 Security Technical Implementation Guide Version: 1 Release: 7 Benchmark Date: 01 Jul 2026:

AlmaLinux OS 9 must be configured so that all network connections associated with SSH traffic are terminated after 10 minutes of becoming unresponsive.

DISA Rule

SV-269419r1050302_rule

Vulnerability Number

V-269419

Group Title

SRG-OS-000395-GPOS-00175

Rule Version

ALMA-09-040170

Severity

CAT II

CCI(s)

• CCI-002891 - Verify session and network connection termination after the completion of nonlocal maintenance and diagnostic sessions.
• CCI-001133 - Terminate the network connection associated with a communications session at the end of the session or after an organization-defined time period of inactivity.
• CCI-002361 - Automatically terminate a user session after organization-defined conditions or trigger events requiring session disconnect.

Weight

10

Fix Recommendation

To configure the SSH server to terminate a user session automatically after the SSH client has become unresponsive, add or modify the following lines in "/etc/ssh/sshd_config":

ClientAliveInterval 600
ClientAliveCountMax 1

Alternatively, add the settings to an include file if the line "Include /etc/ssh/sshd_config.d/*.conf" is found at the top of the "/etc/ssh/sshd_config" file:

$ cat << EOF | tee /etc/ssh/sshd_config.d/clientalive.conf
ClientAliveInterval 600
ClientAliveCountMax 1
EOF

Restart the SSH daemon for the settings to take effect:

$ systemctl restart sshd.service

Check Contents

Verify that the "ClientAliveInterval" variable is set to a value of "600" or less and "ClientAliveCountMax" is set to "1" by performing the following command:

$ sshd -T | grep clientalive

clientaliveinterval 600
clientalivecountmax 1

If "ClientAliveInterval" does not have a value of "600" or less, or "ClientAliveCountMax" is not set to "1", this is a finding.

Vulnerability Number

V-269419

Documentable

False

Rule Version

ALMA-09-040170

Severity Override Guidance

Verify that the "ClientAliveInterval" variable is set to a value of "600" or less and "ClientAliveCountMax" is set to "1" by performing the following command:

$ sshd -T | grep clientalive

clientaliveinterval 600
clientalivecountmax 1

If "ClientAliveInterval" does not have a value of "600" or less, or "ClientAliveCountMax" is not set to "1", this is a finding.

Check Content Reference

M

Target Key

5664