Information
When enabled vSphere performs bidirectional authentication of both the iSCSI target and host. There is a potential for a MitM attack when not authenticating both the iSCSI target and host in which an attacker might impersonate either side of the connection to steal data. Bidirectional authentication mitigates this risk.
NOTE: Nessus has not performed this check. Please review the benchmark to ensure target compliance.
Solution
From the vSphere Web Client go to Host and Clusters >> Select a Cluster >> Configure >> Virtual SAN >> iSCSI Targets
For each iSCSI Target select the item and click the pencil icon to open the edit dialog. Change the 'Authentication' field to 'Mutual CHAP' and configure the incoming and outgoing users and secrets appropriately.