Secure your virtual infrastructure by using the following guidelines.

1) The DISA STIGs for vSphere 5 have been released:

http://iase.disa.mil/stigs/os/virtualization/esx.html

2) The VMware vSphere Hardening Guide is here:

http://blogs.vmware.com/vsphere/2013/04/vsphere-5-1-hardening-guide-official-release.html