The ESXi host Secure Shell (SSH) daemon must not permit tunnels.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-258764 | ESXI-80-000209 | SV-258764r933353_rule | CCI-000366 | medium |
| Description | ||||
| OpenSSH has the ability to create network tunnels (layer 2 and layer 3) over an SSH connection. This function can provide similar convenience to a virtual private network (VPN) with the similar risk of providing a path to circumvent firewalls and network Access Control Lists (ACLs). | ||||
| STIG | Date | |||
| VMware vSphere 8.0 ESXi Security Technical Implementation Guide | 2023-10-11 | |||
Related Frameworks
4 paths across 3 frameworks
Related Frameworks
NIST 800-531 mapping
CM-6
1.00
- DISA · V1R1 · disa_xccdf · related
- DISA · 2025-01-23 · disa_cci_list · equivalent
NIST 800-1712 mappings
3.4.1
1.00
- DISA · V1R1 · disa_xccdf · related
- DISA · 2025-01-23 · disa_cci_list · equivalent
- NIST · Rev 2 (Feb 2020, errata Jan 2021) · nist_800_171_app_d · equivalent
3.4.2
1.00
- DISA · V1R1 · disa_xccdf · related
- DISA · 2025-01-23 · disa_cci_list · equivalent
- NIST · Rev 2 (Feb 2020, errata Jan 2021) · nist_800_171_app_d · equivalent
CCI1 mapping
CCI-000366
1.00
- DISA · V1R1 · disa_xccdf · related
Details
Check Text (C-258764r933353_chk)
From an ESXi shell, run the following command:
# esxcli system ssh server config list -k permittunnel
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 'permittunnel'}
Example result:
permittunnel no
If "permittunnel" is not configured to "no", this is a finding.
Fix Text (F-62413r933352_fix)
From an ESXi shell, run the following command:
# esxcli system ssh server config set -k permittunnel -v no
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 = 'permittunnel'
$arguments.value = 'no'
$esxcli.system.ssh.server.config.set.Invoke($arguments)