The SSH daemon must not permit tunnels.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-63219 | ESXI-06-000025 | SV-77709r1_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 ACLs. |
| STIG | Date |
|---|---|
| VMware vSphere ESXi 6.0 Security Technical Implementation Guide | 2019-01-04 |
Details
| Check Text ( C-63953r1_chk ) |
|---|
| To verify the PermitTunnel setting, run the following command: # grep -i "^PermitTunnel" /etc/ssh/sshd_config If there is no output or the output is not exactly "PermitTunnel no", this is a finding. |
| Fix Text (F-69137r1_fix) |
|---|
| To set the PermitTunnel setting, add or correct the following line in "/etc/ssh/sshd_config": PermitTunnel no |