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The SSH client must be configured to not allow gateway ports.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| GEN005518-ESXI5-704 | GEN005518-ESXI5-704 | GEN005518-ESXI5-704_rule | 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 |
|---|---|
| VMware ESXi v5 Security Technical Implementation Guide | 2013-01-15 |
Details
| Check Text ( C-GEN005518-ESXI5-704_chk ) |
|---|
| Disable lock down mode. Enable the ESXi Shell. Check the SSH client configuration for the gateway ports setting. # grep -i GatewayPorts /etc/ssh/ssh_config | grep -v '^#' If "GatewayPorts" is set to "yes", this is a finding. Re-enable lock down mode. |
| Fix Text (F-GEN005518-ESXI5-704_fix) |
|---|
| Disable lock down mode. Enable the ESXi Shell. Edit the SSH client configuration and add/modify the "GatewayPorts" configuration, setting it to "no". # vi /etc/ssh/ssh_config Re-enable lock down mode. |