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Check: TSS0-ES-000050

IBM z/OS TSS STIG: TSS0-ES-000050 (in versions v9 r2 through v7 r1)

Title

The CA-TSS NPPTHRESH Control Option must be properly set. (Cat II impact)

Discussion

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

Check Content

From the ISPF Command Shell enter: TSS MODIFY STATUS If the NPPTHRESH Control Option value is not set to NPWRTHRESH(02), this is a finding.

Fix Text

Evaluate the impact associated with implementation of the control option. Develop a plan of action to implement the control option setting as specified following and proceed with the change. NPPTHRESH(02)

Additional Identifiers

Rule ID: SV-223878r958388_rule

Vulnerability ID: V-223878

Group Title: SRG-OS-000021-GPOS-00005

Expert Comments

Expert comments are only available to logged-in users.

CCIs

CCIs tied to check.

Number	Definition
CCI-000044	Enforce the organization-defined limit of consecutive invalid logon attempts by a user during the organization-defined time period.

Controls

Controls tied to check. These are derived from the CCIs shown above.

Number	Title
AC-7	Unsuccessful Logon Attempts