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The SSH client must be configured to not allow gateway ports.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-22467 | GEN005518 | SV-26760r1_rule | ECSC-1 | Low |
| Description |
|---|
| SSH TCP connection forwarding provides a mechanism to establish TCP connections proxied by the SSH server. 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. Gateway ports allow remote forwarded ports to bind to non-loopback addresses on the server. |
| STIG | Date |
|---|---|
| UNIX SRG | 2013-03-26 |
Details
| Check Text ( C-27769r1_chk ) |
|---|
| Check the SSH client configuration for the gateway ports setting. # grep -i GatewayPorts /etc/ssh/ssh_config | grep -v '^#' If no lines are returned or the returned setting has a value evaluating to yes, this is a finding. |
| Fix Text (F-24010r1_fix) |
|---|
| Edit the SSH client configuration and change or add the GatewayPorts setting to no. |