IBM z/VM must employ a Session manager.

A session manager controls the semi-permanent interactive information interchange, also known as a dialogue, between a user and z/VM. Without the use of a session manager these semi-permanent interchanges can be open to compromise and attacks.

Examine running systems.

If access is gained to the z/VM system without going through a session manager, this is a finding.

Ensure that a session manager is in use with the system.