Nutanix AOS must protect against an individual (or process acting on behalf of an individual) falsely denying having performed organization-defined actions to be covered by nonrepudiation.

Nonrepudiation of actions taken is required to maintain application integrity. Examples of actions include creating information, sending a message, approving information (e.g., indicating concurrence or signing a contract), and receiving a message. Nonrepudiation protects individuals against later claims by an author of not having authored a particular document, a sender of not having transmitted a message, a receiver of not having received a message, or a signatory of not having signed a document. Typical application server actions requiring nonrepudiation will be related to application deployment among developers/users and administrative actions taken by admin personnel.

Confirm the Nutanix VM application server Prism Element WebUI requires client authentication. 1. Log in to Prism Element. 2. Click the gear icon in the upper-right corner. 3. Navigate to the "Authentication" section. 4. Click the "Client" tab. 5. Verify "Client Authentication" is enabled. If Client Authentication (CAC Auth) is not enabled, this is a finding.

Configure the Nutanix VM application server Prism Element WebUI to require client authentication. 1. Log in to Prism Element. 2. Click the gear in the upper-right corner and navigate to "Authentication". 3. Click the "Client" tab. 4. Select the "Configure Client Chain Certificate" check box. 5. Click the "Choose File" button, browse to and select a client chain certificate to upload, and then click the "Open" button to upload the certificate. 6. Click "Enable Client Authentication".