From z/OS TSS STIG
Part of ZCIC0042
Associated with: CCI-000057
CICS is a transaction-processing product that provides programmers with the facilities to develop interactive applications. Improperly defined or controlled CICS userids (i.e., region, default, and terminal users) may provide an exposure and vulnerability within the CICS environment. This could result in the compromise of the confidentiality, integrity, and availability of the CICS region, applications, and customer data.
a) Refer to the following report produced by the TSS Data Collection: - TSSCMDS.RPT(@ACIDS) Refer to the CICS Systems Programmer Worksheets filled out from previous vulnerability ZCIC0010. NOTE: Note: Any ACID that does not have a OPTIME value specified will obtain its OPTIME value from the default value set in ZCIC0041. Any ACID that specifies an OPTIME value must meet the requirements specified below. b) Ensure that all ACIDs authorized to access a CICS facility have their OPTIME field set to 15 minutes. c) If (b) is true for each CICS region and/or CICS user, there is NO FINDING. NOTE: If the time-out limit is greater than 15 minutes, and the system is processing unclassified information, review the following items. If any of these is true, there is NO FINDING. 1) If a session is not terminated, but instead is locked out after 15 minutes of inactivity, a process must be in place that requires user identification and authentication before the session is unlocked. Session lock-out will be implemented through system controls or terminal screen protection. 2) A system’s default time for terminal lock-out or session termination may be lengthened to 30 minutes at the discretion of the IAM. The IAM will maintain the documentation for each system with a time-out adjusted beyond the 15-minute recommendation to explain the basis for this decision. 3) The IAM may set selected userids to have a time-out of up to 60 minutes in order to complete critical reports or transactions without timing out. Each exception must meet the following criteria: (a) The time-out exception cannot exceed 60 minutes. (b) A letter of justification fully documenting the user requirement(s) must be submitted and approved by the site IAM. In addition, this letter must identify an alternate means of access control for the terminal(s) involved (e.g., a room that is locked at all times, a room with a cipher lock to limit access, a password protected screen saver set to 30 minutes or less, etc.). (c) The requirement must be revalidated on an annual basis. d) If the CICS time-out limit is not specified for 15 minutes of inactivity, and the previously mentioned exceptions do not apply, this is a FINDING.
Review all CICS region, default, and end-user userids to ensure they are defined and controlled as required. Ensure that all ACIDs authorized to access a CICS facility have their OPTIME field set to 15 minutes. Example: TSS ADDTO(acid) OPTIME(hhmm)
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