ESXI-06-000023 - The SSH daemon must be configured to not allow X11 forwarding.

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Information

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.

NOTE: Nessus has not performed this check. Please review the benchmark to ensure target compliance.

Solution

To set the X11Forwarding setting, add or correct the following line in '/etc/ssh/sshd_config':

X11Forwarding no

See Also

http://iasecontent.disa.mil/stigs/zip/U_VMware_vSphere_6-0_ESXi_V1R4_STIG.zip