The ESXi host Secure Shell (SSH) daemon must set a timeout count on idle sessions.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
low	V-258765	SRG-OS-000480-VMM-002000	ESXI-80-000210	SV-258765r933356_rule	2023-10-11	1

Description
Setting a timeout ensures that a user login will be terminated as soon as the "ClientAliveCountMax" is reached.

ℹ️ Check
From an ESXi shell, run the following command: # esxcli system ssh server config list -k clientalivecountmax or From a PowerCLI command prompt while connected to the ESXi host, run the following commands: $esxcli = Get-EsxCli -v2 $esxcli.system.ssh.server.config.list.invoke() \| Where-Object {$_.Key -eq 'clientalivecountmax'} Example result: clientalivecountmax 3 If "clientalivecountmax" is not configured to "3", this is a finding.

ℹ️ Check

From an ESXi shell, run the following command: # esxcli system ssh server config list -k clientalivecountmax or From a PowerCLI command prompt while connected to the ESXi host, run the following commands: $esxcli = Get-EsxCli -v2 $esxcli.system.ssh.server.config.list.invoke() | Where-Object {$_.Key -eq 'clientalivecountmax'} Example result: clientalivecountmax 3 If "clientalivecountmax" is not configured to "3", this is a finding.

✔️ Fix
From an ESXi shell, run the following command: # esxcli system ssh server config set -k clientalivecountmax -v 3 or From a PowerCLI command prompt while connected to the ESXi host, run the following commands: $esxcli = Get-EsxCli -v2 $arguments = $esxcli.system.ssh.server.config.set.CreateArgs() $arguments.keyword = 'clientalivecountmax' $arguments.value = '3' $esxcli.system.ssh.server.config.set.Invoke($arguments)

✔️ Fix

From an ESXi shell, run the following command: # esxcli system ssh server config set -k clientalivecountmax -v 3 or From a PowerCLI command prompt while connected to the ESXi host, run the following commands: $esxcli = Get-EsxCli -v2 $arguments = $esxcli.system.ssh.server.config.set.CreateArgs() $arguments.keyword = 'clientalivecountmax' $arguments.value = '3' $esxcli.system.ssh.server.config.set.Invoke($arguments)