ESXI-06-000022 - The SSH daemon must be configured to not allow gateway ports.

Information

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.

Solution

To set the GatewayPorts setting, add or correct the following line in '/etc/ssh/sshd_config':

GatewayPorts no

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_VMware_vSphere_6-0_ESXi_V1R5_STIG.zip