The vCenter Server for Windows must have new Key Encryption Keys (KEKs) re-issued at regular intervals for vSAN encrypted datastore(s).

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-94835	VCWN-65-000066	SV-104665r1_rule		Low

Description
The Key Encryption Key (KEK) for a vSAN encrypted datastore is generated by the Key Management Server (KMS) and serves as a wrapper and lock around the Disk Encryption Key (DEK). The DEK is generated by the host and is used to encrypt and decrypt the datastore. A shallow re-key is a procedure in which the KMS issues a new KEK to the ESXi host which re-wraps the DEK but does not change the DEK or any data on disk. This operation must be done on a regular, site defined interval and can be viewed as similar in criticality to changing an administrative password. Should the KMS itself somehow be compromised, a standing operational procedure to re-key will put a time limit on the usefulness of any stolen KMS data.

Description

The Key Encryption Key (KEK) for a vSAN encrypted datastore is generated by the Key Management Server (KMS) and serves as a wrapper and lock around the Disk Encryption Key (DEK). The DEK is generated by the host and is used to encrypt and decrypt the datastore. A shallow re-key is a procedure in which the KMS issues a new KEK to the ESXi host which re-wraps the DEK but does not change the DEK or any data on disk. This operation must be done on a regular, site defined interval and can be viewed as similar in criticality to changing an administrative password. Should the KMS itself somehow be compromised, a standing operational procedure to re-key will put a time limit on the usefulness of any stolen KMS data.

STIG	Date
VMware vSphere 6.5 vCenter Server for Windows Security Technical Implementation Guide	2019-12-12

Details

Check Text ( C-94031r1_chk )
Interview the SA to determine that a procedure has been put in place to perform a shallow re-key of all vSAN encrypted datastores at regular, site defined intervals. VMware recommends a 60-day re-key task but this interval must be defined by the SA and the ISSO. If vSAN encryption is not in use, this is not a finding.

Fix Text (F-100959r1_fix)
If vSAN encryption is in use, ensure that a regular re-key procedure is in place.