STIGQter: STIG Summary: SUSE Linux Enterprise Micro (SLEM) 5 Security Technical Implementation Guide Version: 1 Release: 4 Benchmark Date: 01 Apr 2026:

SLEM 5 must be configured so that all network connections associated with SSH traffic terminate after becoming unresponsive.

DISA Rule

SV-261331r996459_rule

Vulnerability Number

V-261331

Group Title

SRG-OS-000163-GPOS-00072

Rule Version

SLEM-05-255030

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.

Weight

10

Fix Recommendation

Add or modify the following line in the "/etc/ssh/sshd_config" file:

ClientAliveCountMax 1

Restart the SSH daemon for the changes to take effect:

> sudo systemctl restart sshd.service

Check Contents

Verify the SSH server automatically terminates a user session after the SSH client has become unresponsive by using 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'
/etc/ssh/sshd_config:ClientAliveCountMax 1

If "ClientAliveCountMax" is not set to "1", is commented out, missing, or conflicting results are returned, this is a finding.

Vulnerability Number

V-261331

Documentable

False

Rule Version

SLEM-05-255030

Severity Override Guidance

Verify the SSH server automatically terminates a user session after the SSH client has become unresponsive by using 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'
/etc/ssh/sshd_config:ClientAliveCountMax 1

If "ClientAliveCountMax" is not set to "1", is commented out, missing, or conflicting results are returned, this is a finding.

Check Content Reference

M

Target Key

5596