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The SSH client must be configured to not allow X11 forwarding.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| GEN005520-ESXI5-705 | GEN005520-ESXI5-705 | GEN005520-ESXI5-705_rule | Low |
| Description |
|---|
| X11 forwarding over SSH allows for the secure remote execution of X11-based applications. This feature can increase the attack surface of an SSH connection and should not be enabled unless needed. |
| STIG | Date |
|---|---|
| VMware ESXi v5 Security Technical Implementation Guide | 2013-01-15 |
Details
| Check Text ( C-GEN005520-ESXI5-705_chk ) |
|---|
| Disable lock down mode. Enable the ESXi Shell. Check the SSH client configuration for the X11 forwarding setting. # grep -i "^ForwardX11" /etc/ssh/ssh_config If "ForwardX11" is set to "yes", this is a finding. Re-enable lock down mode. |
| Fix Text (F-GEN005520-ESXI5-705_fix) |
|---|
| Disable lock down mode. Enable the ESXi Shell. Edit the SSH client configuration and add/modify the "ForwardX11" configuration to "no". # vi /etc/ssh/ssh_config Re-enable lock down mode. |