The Mainframe Product must enforce the limit of three consecutive invalid logon attempts by a user during a 15 minute time period.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-205455	SRG-APP-000065	SRG-APP-000065-MFP-000093	SV-205455r960840_rule	2024-12-05	3

Description
By limiting the number of failed logon attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute forcing, is reduced. Limits are imposed by locking the account.

ℹ️ Check
If the Mainframe Product has no function or capability for user logon, this is not applicable. If the Mainframe Product employs an external security manager for all account management functions, this is not applicable. Examine Mainframe Product configuration settings. Verify that the Mainframe Product account management settings enforce a limit of three consecutive invalid logon attempts by a user during a 15 minute time period. If it does not, this is a finding.

ℹ️ Check

If the Mainframe Product has no function or capability for user logon, this is not applicable. If the Mainframe Product employs an external security manager for all account management functions, this is not applicable. Examine Mainframe Product configuration settings. Verify that the Mainframe Product account management settings enforce a limit of three consecutive invalid logon attempts by a user during a 15 minute time period. If it does not, this is a finding.

✔️ Fix
Configure the Mainframe Product account management settings to enforce a limit of three consecutive invalid logon attempts by a user during a 15 minute time period.