Title

IBM z/OS must have Certificate Name Filtering implemented with appropriate authorization and documentation. (Cat II impact)

Discussion

To assure accountability and prevent unauthenticated access, organizational users must be identified and authenticated to prevent potential misuse and compromise of the system. Organizational users include organizational employees or individuals the organization deems to have equivalent status of employees (e.g., contractors). Organizational users (and processes acting on behalf of users) must be uniquely identified and authenticated to all accesses, except for the following: 1) Accesses explicitly identified and documented by the organization. Organizations document specific user actions that can be performed on the information system without identification or authentication; and 2) Accesses that occur through authorized use of group authenticators without individual authentication. Organizations may require unique identification of individuals in group accounts (e.g., shared privilege accounts) or for detailed accountability of individual activity.

Check Content

If certificate name filtering is in use, the ISSM should document each active filter rule and have written approval to use the rule. Issue the following TSS command to list any certificate name filters defined to TSS: TSS LIST(SDT) CERTMAP(ALL) If there is nothing to list, this is not a finding. NOTE: Certificate name filters are only valid when their Status is TRUST. Therefore, you may ignore filters with the NOTRUST status. If certificate name filters are defined and they have a Status of TRUST, certificate name filtering is in use. If certificate name filtering is in use and filtering rules have been documented and approved by the ISSM, this is not a finding. If certificate name filtering is in use and filtering rules have not been documented and approved by the ISSM, this is a finding.

Fix Text

Ensure any certificate name filtering rules in use are documented and approved by the ISSM.

Additional Identifiers

Rule ID: SV-223873r877714_rule

Vulnerability ID: V-223873

Group Title: SRG-OS-000104-GPOS-00051

Expert Comments

CCIs tied to check.

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