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The SSH daemon must not permit tunnels.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-22480 | GEN005531 | SV-26774r1_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 |
|---|---|
| UNIX SRG | 2013-03-26 |
Details
| Check Text ( C-27782r1_chk ) |
|---|
| Check the SSH daemon configuration for the PermitTunnel setting. # grep -i PermitTunnel /etc/ssh/sshd_config | grep -v '^#' If the setting is not present, or set to yes, this is a finding. |
| Fix Text (F-24024r1_fix) |
|---|
| Edit the SSH daemon configuration and add or edit the PermitTunnel setting value to no. |