STIG ID - BACF1029: Limit Access to System User Catalogs

Severity: 1 - High
The master catalog for a system contains entries for all the user catalogs that are used on the system and the aliases pointing to them. System catalogs are the basis for locating all files on the system. Unauthorized access could result in the compromise of the operating system environment, the external security manager, and customer data.
The organization must ensure that write or greater access to the system user catalogs is limited to system programmers and all access must be logged.
This STIG article shows how to review access authorizations to the system user catalogs, how to limit write or greater access to only system programmers, and how to log all activity.
Identify Audit Finding
Review the following data to determine if you should consider remediation:
Follow these steps
:
  1. Review access to the system user catalog and ensure the following:
    • Allocate access is limited to system programmers.
    • Users may have write access to user catalogs as needed.
    • Allocate access is logged.
    ACF ACCESS DSN('
    hlq.user.catalog
    ') ACCESS Subcommand Results as of 08/05/20-12:20 for:
    user_catalog
    $Key: hlq Ruleline:
    user_catalog
    UID(*****SYSPROG) READ(A) WRITE(A) ALLOC(L) EXEC(A) ACF
    In this example, the system programmer (SYSPROG) has read, write, and allocate access to the system user catalog data set and all activity is logged.
  2. If write or greater access to system user catalog data sets are limited to system programmers and such activity is logged,
    your organization does not have an audit finding.
  3. If write or greater access to system user catalog data sets is not limited to system programmers and write access or greater is not logged,
    your organization has an audit finding.
    See Remediate Audit Findings.
Remediate Audit Finding
The Information System Security Officer (ISSO) is responsible for ensuring that write or greater access to system user catalog is limited to only system programmers and all activity is logged.
Follow these steps:
  1. Evaluate the impact of correcting the deficiency and develop a plan of action to implement the required changes.
  2. Implement controls to specify only system programmers are authorized to write or greater access to the system user catalogs:
    $KEY(hlq)
    user_catalog
    UID(*****SYSPROG) READ(A) WRITE(A) ALLOC(L) EXEC(A)
    or
    $KEY(hlq)
    user_catalog
    ROLE(ZSYSPROG) READ(A) WRITE(A) ALLOC(L) EXEC(A)
    The SYSPROG is now authorized to update and alter the system user catalogs.
Implementing controls to system user catalogs protects your organization's operating system environment, external security manager, and customer data.
Control Correlation Identifier (CCI)
A Control Correlation Identifier (CCI) list provides a standard identifier and description for each of the singular, actionable statements that comprise a control or best practice. The following CCIs are related to this STIG. For more information, see the National Institute of Standards and Technology website.
CCIs
: CCI-000213, CCI-002234
CCI
:
CCI-000213
Published Date
:
2009-09-14
Definition
:
The information system enforces approved authorizations for logical access to information and system resources in accordance with applicable access control policies.
Type
:
technical
References
:
NIST: NIST SP 800-53 (v3): CM-5 (6)
NIST: NIST SP 800-53 Revision 4 (v4): AC-3
NIST: NIST SP 800-53A (v1): AC-3.1
CCI
:
CCI-002234
Published Date
:
2013-06-24
Definition
:
The information system audits the execution of privileged functions.
Type
:
technical
References
:
NIST: NIST SP 800-53 Revision 4 (v4): AC-6 (9)