IBM z/VM must be protected by an external firewall that has a deny-all, allow-by-exception policy.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-237966	IBMZ-VM-002360	SV-237966r649738_rule		Medium

Description
Firewalls protect computers from network attacks by blocking or limiting access to open network ports. Firewalls provide monitoring and control of communications at the external boundary of an information system to prevent and detect malicious and other unauthorized communications.

STIG	Date
IBM zVM Using CA VM:Secure Security Technical Implementation Guide	2021-06-16

Details

Check Text ( C-41176r649736_chk )
Ask the system administrator for a network system plan. If there is no firewall defined for the IBM z/VM system, this is a finding. If the firewall does not have a deny-all, allow-by-exception policy, this is a finding.

Fix Text (F-41135r649737_fix)
Ensure that the network has a firewall installed that provides a deny-all, allow-by-exception protection for the IBM z/VM system.