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Check: ACF2-ES-000430

IBM z/OS ACF2 STIG: ACF2-ES-000430 (in versions v8 r15 through v7 r1)

Title

The CA-ACF2 PSWD GSO record values for MAXTRY and PASSLMT 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-forcing, is reduced. Limits are imposed by locking the account.

Check Content

From an ACF command screen enter: SET CONTROL(GSO) SHOW PSwdopts If "MAXTRY" is set to "3", this is not a finding. If "PASSLMT" is set to "3", this is not a finding.

Fix Text

Configure the GSO option "MAXTRY" to equal "3". Configure the GSO option "PASSLMT" to equal "3".

Additional Identifiers

Rule ID: SV-223462r853526_rule

Vulnerability ID: V-223462

Group Title: SRG-OS-000329-GPOS-00128

Expert Comments

Expert comments are only available to logged-in users.

CCIs

CCIs tied to check.

Number	Definition
CCI-002238	The information system automatically locks the account or node for either an organization-defined time period, until the locked account or node is released by an administrator, or delays the next logon prompt according to the organization-defined delay algorithm when the maximum number of unsuccessful logon attempts is exceeded.

Controls

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

Number	Title
AC-7	Unsuccessful Logon Attempts