The SSH client must not permit tunnels.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-22481 | GEN005532 | SV-26775r1_rule | ECSC-1 | 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 |
|---|---|
| Draft AIX Security Technical Implementation Guide | 2011-08-17 |
Details
| Check Text ( C-27783r1_chk ) |
|---|
| Check the SSH client configuration for the PermitTunnel setting. # grep -i PermitTunnel /etc/ssh/ssh_config | grep -v '^#' If the setting is not present, or set to yes, this is a finding. |
| Fix Text (F-24025r1_fix) |
|---|
| Edit the SSH client configuration and add or edit the PermitTunnel setting value to no. |