CA VM:Secure product Config Delay LOG option must be set to 0.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-237916	IBMZ-VM-000590	SV-237916r649588_rule		Medium

Description
IBM z/VM 6.4.0 made changes to obscure whether a logon is invalid due to the user ID or due to the password. Both the logon prompting sequence and the message HCPLGA050E were changed. However, DELAYLOG causes a delay for a logon with an invalid password that it does not cause when the user ID is invalid. Thus, if you are using DELAYLOG with z/VM 6.4.0, you can inadvertently let someone trying to break into your system know that it is the password that is invalid.

Description

IBM z/VM 6.4.0 made changes to obscure whether a logon is invalid due to the user ID or due to the password. Both the logon prompting sequence and the message HCPLGA050E were changed. However, DELAYLOG causes a delay for a logon with an invalid password that it does not cause when the user ID is invalid. Thus, if you are using DELAYLOG with z/VM 6.4.0, you can inadvertently let someone trying to break into your system know that it is the password that is invalid.

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

Details

Check Text ( C-41126r649586_chk )
Display the CA VM:Secure product Config file. If the “DELAYLOG” record does not exist, this is not a finding. If the “DELAYLOG” record is set to "0”, this is not a finding.

Fix Text (F-41085r649587_fix)
Configure DELAYLOG = 0 or delete the “DELAYLOG” configuration file record.