STIGQter: STIG Summary: SUSE Linux Enterprise Server 15 Security Technical Implementation Guide Version: 2 Release: 8 Benchmark Date: 01 Jul 2026:

The SUSE operating system, for all network connections associated with SSH traffic, must immediately terminate at the end of the session or after 10 minutes of inactivity.

DISA Rule

SV-234830r1106556_rule

Vulnerability Number

V-234830

Group Title

SRG-OS-000163-GPOS-00072

Rule Version

SLES-15-010320

Severity

CAT II

CCI(s)

• 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

Configure the SUSE operating system to automatically terminate all network connections associated with SSH traffic at the end of a session or after a 10-minute period of inactivity.

Modify or append the following lines in the "/etc/ssh/sshd_config" file:

ClientAliveCountMax 1

For the changes to take effect, the SSH daemon must be restarted.

> sudo systemctl restart sshd.service

Check Contents

Verify all network connections associated with SSH traffic are automatically terminated at the end of the session or after 10 minutes of inactivity.

Check that the "ClientAliveCountMax" variable is set to a value of "1" by performing the following command:

> sudo /usr/sbin/sshd -dd 2>&1 | awk '/filename/ {print $4}' | tr -d '\r' | tr '\n' ' ' | xargs sudo grep -iH '^\s*clientalivecountmax'

ClientAliveCountMax 1

If "ClientAliveCountMax" does not exist or "ClientAliveCountMax" is not set to a value of "1" in "/etc/ssh/sshd_config", or the line is commented out, this is a finding.

Vulnerability Number

V-234830

Documentable

False

Rule Version

SLES-15-010320

Severity Override Guidance

Verify all network connections associated with SSH traffic are automatically terminated at the end of the session or after 10 minutes of inactivity.

Check that the "ClientAliveCountMax" variable is set to a value of "1" by performing the following command:

> sudo /usr/sbin/sshd -dd 2>&1 | awk '/filename/ {print $4}' | tr -d '\r' | tr '\n' ' ' | xargs sudo grep -iH '^\s*clientalivecountmax'

ClientAliveCountMax 1

If "ClientAliveCountMax" does not exist or "ClientAliveCountMax" is not set to a value of "1" in "/etc/ssh/sshd_config", or the line is commented out, this is a finding.

Check Content Reference

M

Target Key

5274