DFSMS control data sets must be protected in accordance with security requirements.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-3895	ZSMS0020	SV-3895r3_rule		Medium

Description
DFSMS control data sets provide the configuration and operational characteristics of the system-managed storage environment. Failure to properly protect these data sets may result in unauthorized access. This exposure could compromise the availability and integrity of some system services and customer data.

STIG	Date
z/OS ACF2 STIG	2019-12-12

Details

Check Text ( C-72931r1_chk )
a) Refer to the following report produced by the Data Set and Resource Data Collection: - SENSITVE.RPT(SMSRPT) Automated Analysis Refer to the following report produced by the Data Set and Resource Data Collection: - PDI(ZSMS0020) b) Review the logical parmlib data sets, example: SYS1.PARMLIB(IGDSMSxx), to identify the fully qualified file names for the following SMS data sets: Source Control Data Set (SCDS) Active Control Data Set (ACDS) Communications Data Set (COMMDS) Automatic Class Selection Routine Source Data Sets (ACS) ACDS Backup COMMDS Backup c) If the ACF2 data set rules for the SCDS, ACDS, COMMDS, and ACS data sets restrict UPDATE and ALLOCATE access to only systems programming personnel, this not is a finding d) If the ACF2 data set rules for the SCDS, ACDS, COMMDS, and ACS data sets do not restrict UPDATE and ALLOCATE access to only systems programming personnel, this is a finding. Note: At the discretion of the ISSM, DASD administrators are allowed UPDATE access to the control datasets.

Check Text ( C-72931r1_chk )

a) Refer to the following report produced by the Data Set and Resource Data Collection:

- SENSITVE.RPT(SMSRPT)

Automated Analysis
Refer to the following report produced by the Data Set and Resource Data Collection:

- PDI(ZSMS0020)

b) Review the logical parmlib data sets, example: SYS1.PARMLIB(IGDSMSxx), to identify the fully qualified file names for the following SMS data sets:

Source Control Data Set (SCDS)
Active Control Data Set (ACDS)
Communications Data Set (COMMDS)
Automatic Class Selection Routine Source Data Sets (ACS)
ACDS Backup
COMMDS Backup

c) If the ACF2 data set rules for the SCDS, ACDS, COMMDS, and ACS data sets restrict UPDATE and ALLOCATE access to only systems programming personnel, this not is a finding

d) If the ACF2 data set rules for the SCDS, ACDS, COMMDS, and ACS data sets do not restrict UPDATE and ALLOCATE access to only systems programming personnel, this is a finding.
Note: At the discretion of the ISSM, DASD administrators are allowed UPDATE access to the control datasets.

Fix Text (F-79237r1_fix)
Ensure that DFSMS control data sets restrict UPDATE or ALLOCATE access to system programmers responsible for DASD management. Justification is required for any additional access. Review the SYS1.PARMLIB(IGDSMSxx) data set to identify the fully qualified file names for the following SMS data sets: Source Control Data Set (SCDS) Active Control Data Set (ACDS) Communications Data Set (COMMDS) Automatic Class Selection Routine Source Data Sets (ACS) ACDS Backup COMMDS Backup Ensure the ACF2 data set rules for the SCDS, ACDS, COMMDS, and ACS data sets restrict UPDATE and ALLOCATE access to only systems programming personnel. Note: At the discretion of the ISSM, DASD administrators are allowed UPDATE access to the control datasets. Example: $KEY(S3D) $PREFIX(SYS3) DFSMS.MVA.ACDS UID(syspaudt) R(A) W(L) A(L) E(A) DFSMS.MVA.COMMDS UID(syspaudt) R(A) W(L) A(L) E(A) DFSMS.MVA.SCDS UID(syspaudt) R(A) W(L) A(L) E(A) DFSMS.MVA.ACS UID(syspaudt) R(A) W(L) A(L) E(A)

Fix Text (F-79237r1_fix)

Ensure that DFSMS control data sets restrict UPDATE or ALLOCATE access to system programmers responsible for DASD management. Justification is required for any additional access.

Review the SYS1.PARMLIB(IGDSMSxx) data set to identify the fully qualified file names for the following SMS data sets:

Source Control Data Set (SCDS)
Active Control Data Set (ACDS)
Communications Data Set (COMMDS)
Automatic Class Selection Routine Source Data Sets (ACS)
ACDS Backup
COMMDS Backup

Ensure the ACF2 data set rules for the SCDS, ACDS, COMMDS, and ACS data sets restrict UPDATE and ALLOCATE access to only systems programming personnel.

Note: At the discretion of the ISSM, DASD administrators are allowed UPDATE access to the control datasets.

Example:

$KEY(S3D)
$PREFIX(SYS3)
DFSMS.MVA.ACDS UID(syspaudt) R(A) W(L) A(L) E(A)
DFSMS.MVA.COMMDS UID(syspaudt) R(A) W(L) A(L) E(A)
DFSMS.MVA.SCDS UID(syspaudt) R(A) W(L) A(L) E(A)
DFSMS.MVA.ACS UID(syspaudt) R(A) W(L) A(L) E(A)