The SSH client must be configured to not allow TCP forwarding.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-39249 | GEN005516-ESXI5-703 | SV-51065r3_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. |
| STIG | Date |
|---|---|
| VMware ESXi Server 5.0 Security Technical Implementation Guide | 2017-01-06 |
Details
| Check Text ( C-46513r3_chk ) |
|---|
| Disable lock down mode. Enable the ESXi Shell. Execute the following command(s): # grep Forward /etc/ssh/ssh_config Re-enable lock down mode. If any of the following attributes (ForwardAgent, ForwardX11, or ForwardX11Trusted) exist and are not set to "no", this is a finding. If the /etc/ssh/ssh_config file does not exist, this is not a finding. |
| Fix Text (F-44228r2_fix) |
|---|
| Disable lock down mode. Enable the ESXi Shell. Execute the following command(s): # vi /etc/ssh/ssh_config Add/modify the attribute line entry to the following (quotes for emphasis only): "ForwardAgent no" "ForwardX11 no" "ForwardX11Trusted no" Re-enable lock down mode. |