The ESXi host Secure Shell (SSH) daemon must not permit tunnels.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-256393 | ESXI-70-000025 | SV-256393r959010_rule | 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 7.0 ESXi Security Technical Implementation Guide | 2024-12-16 |
Details
| Check Text (C-60068r885958_chk) |
| From an ESXi shell, run the following command: # /usr/lib/vmware/openssh/bin/sshd -T|grep permittunnel Expected result: permittunnel no If the output does not match the expected result, this is a finding. |
| Fix Text (F-60011r885959_fix) |
| From an ESXi shell, add or correct the following line in "/etc/ssh/sshd_config": PermitTunnel no |