The SSH client must be configured to not allow TCP forwarding.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| GEN005516-ESXI5-703 | GEN005516-ESXI5-703 | GEN005516-ESXI5-703_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 v5 Security Technical Implementation Guide | 2013-01-15 |
Details
| Check Text ( C-GEN005516-ESXI5-703_chk ) |
|---|
| Disable lock down mode. Enable the ESXi Shell. Check the SSH client configuration for allowed MACs. # grep Forward /etc/ssh/ssh_config | grep -v '^#' Re-enable lock down mode. If any forward list exists, this is a finding. |
| Fix Text (F-GEN005516-ESXI5-703_fix) |
|---|
| Disable lock down mode. Enable the ESXi Shell. Edit the SSH client configuration and delete any/all existing Forward lists in the client configuration. # vi /etc/ssh/ssh_config Re-enable lock down mode. |