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z/OS IBM System Display and Search Facility for ACF2 Security Technical Implementation Guide

  • Version/Release: V6R11
  • Published: 2022-10-06
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This Security Technical Implementation Guide is published as a tool to improve the security of Department of Defense (DoD) information systems. The requirements are derived from the National Institute of Standards and Technology (NIST) 800-53 and related documents. Comments or proposed revisions to this document should be sent via email to the following address: disa.stig_spt@mail.mil.
b
IBM System Display and Search Facility (SDSF) Configuration parameters must be correctly specified.
AC-4 - Medium - CCI-000035 - V-224316 - SV-224316r868180_rule
RMF Control
AC-4
Severity
Medium
CCI
CCI-000035
Version
ZISF0040
Vuln IDs
  • V-224316
  • V-18014
Rule IDs
  • SV-224316r868180_rule
  • SV-40746
IBM System Display and Search Facility (SDSF) ISFPARMS defines global options, panel formats, and security for SDSF. Failure to properly specify these parameter values could potentially compromise the integrity and availability of the MVS operating system and user data.
Checks: C-25993r868178_chk

Refer to the JCL procedure libraries defined to JES2 for the SDSF started task member for SDSFPARM DD statement. Refer to the ISRPRMxx members in the logical PARMLIB concatenation. Refer to the results of the "F SDSF,D" command. Where SDSF should specify the SDSF started task name. Automated Analysis Refer to the following report produced by the z/OS Data Collection: - PDI(ZISF0040) Ensure the following Group Parameters are specified or not specified in the GROUP statements defined in the ISFPARMS members. If the following guidance is true, this is not a finding. For each GROUP statement: AUPDT(0) AUTH will not be specified CMDAUTH will not be specified CMDLEV will not be specified DSPAUTH will not be specified NAME a value will be specified for the NAME

Fix: F-25981r868179_fix

Ensure that the following Group function parameters appear and/or do not appear in ISFPARMS. For each GROUP statement: AUPDT(0) AUTH will not be specified CMDAUTH will not be specified CMDLEV will not be specified DSPAUTH will not be specified NAME a value will be specified for the NAME The ISFPARMS GROUP statement defines user groups and their characteristics. Some of these characteristics include access authorization to SDSF functions and commands. Access to these functions and commands will be controlled using SAF resources. The use of the SAF interface is consistent with the DOD requirement to control all products within the operating system using the ACP. To ensure SAF security is always in effect, authorizations to SDSF functions and commands should not be defined in ISFPARMS DD statement in the SDSF JCL member.

b
IBM System Display and Search Facility (SDSF) installation data sets will be properly protected.
AC-3 - Medium - CCI-000213 - V-224317 - SV-224317r856987_rule
RMF Control
AC-3
Severity
Medium
CCI
CCI-000213
Version
ZISFA000
Vuln IDs
  • V-224317
  • V-16932
Rule IDs
  • SV-224317r856987_rule
  • SV-40696
IBM System Display and Search Facility (SDSF) installation data sets have the ability to use privileged functions and/or have access to sensitive data. Failure to properly restrict access to these data sets could result in violating the integrity of the base product which could result in compromising the operating system or sensitive data.
Checks: C-25994r840226_chk

Refer to the following report produced by the Data Set and Resource Data Collection: - SENSITVE.RPT(ISFRPT) Automated Analysis Refer to the following report produced by the Data Set and Resource Data Collection: - PDI(ZISF0000) Verify that the accesses to the IBM SDSF installation data sets are properly restricted. If the following guidance is true, this is not a finding. ___ The ACF2 data set rules for the data sets restricts READ access to all authorized users. ___ The ACF2 data set rules for the data sets restricts WRITE and/or greater access to systems programming personnel. ___ The ACF2 data set rules for the data sets specify that all (i.e., failures and successes) WRITE and/or greater access is logged.

Fix: F-25982r840239_fix

The ISSO will ensure that WRITE and/or greater access to IBM SDSF installation data sets is limited to System Programmers only, and all WRITE and/or greater access is logged. READ access can be given to all authorized users. The installing Systems Programmer will identify and document the product data sets and categorize them according to who will have WRITE and/or greater access and if required that all WRITE and/or greater access is logged, will identify if any additional groups have WRITE and/or greater access for specific data sets, and once documented, will work with the ISSO to see that they are properly restricted to the ACP (Access Control Program) active on the system. Data sets to be protected will be: SYS1.ISF.AISF SYS1.ISF.SISF The following commands are provided as a sample for implementing data set controls: $KEY(S1I) $PREFIX(SYS1) ISF.AISF-.- UID(syspaudt) R(A) W(L) A(L) E(A) ISF.SISF-.- UID(syspaudt) R(A) W(L) A(L) E(A) ISF.SISF-.- UID(authorized users/*) R(A) E(A) SET RULE COMPILE 'ACF2.MVA.DSNRULES(S1I)' STORE

b
IBM System Display and Search Facility (SDSF) HASPINDX data set identified in the INDEX parameter must be properly protected.
AC-3 - Medium - CCI-000213 - V-224318 - SV-224318r520348_rule
RMF Control
AC-3
Severity
Medium
CCI
CCI-000213
Version
ZISFA002
Vuln IDs
  • V-224318
  • V-21592
Rule IDs
  • SV-224318r520348_rule
  • SV-40730
IBM System Display and Search Facility (SDSF) HASPINDX data set control the execution, configuration, and security of the SDSF products. Failure to properly protect access to these data sets could result in unauthorized access. This exposure may threaten the availability of SDSF, and compromise the confidentiality of customer data.
Checks: C-25995r520346_chk

If the z/OS operating system is Release 2.2 or higher this is not applicable. Refer to the following report produced by the Data Set and Resource Data Collection: - SENSITVE.RPT(SDSFRPT) Automated Analysis Refer to the following report produced by the Data Set and Resource Data Collection: - PDI(ZISF0002) Verify that the accesses to the IBM System Display and Search Facility (SDSF) HASPINDX data set specified on the INDEX control statement in the ISFPARMS statements (identified in the SFSFPARM DD statement of the SDSF stc) are properly restricted. If the following guidance is true, this is not a finding. ___ The ACF2 data set rules for the data sets restricts READ access to the auditors. ___ The ACF2 data set rules for the data sets restricts UPDATE access to SDSF Started Tasks. ___ The ACF2 data set rules for the data sets restricts WRITE and/or greater access to systems programming personnel. Note: If running z/OS V1R11 or above, with the use of a new JES logical log, the HASPINDX, may not exist and may make this vulnerability not applicable (N/A). However if used the HASPINDX dataset must be restricted. Note: If running z/OS V1R11 systems or above and NOT using JES logical log, the HASPINDX data set must be protected.

Fix: F-25983r520347_fix

Ensure that the HASPINDX dataset identified in the INDEX parameter value of ISFPARMS options statement is restricted as described below. The HASPINDX data set is used by SDSF when building the SYSLOG panel. This data set contains information related to all SYSLOG jobs and data sets on the spool. Since SDSF dynamically allocates this data set, explicit user access authorization to this data set should not be required. Due to the potentially sensitive data in this data set, access authorization will be restricted. READ access is restricted to the auditors. UPDATE access is restricted to SDSF Started Tasks. WRITE and/or greater access is restricted to systems programming personnel. Note: If running z/OS V1R11 or above, with the use of a new JES logical log, the HASPINDX, may not exist and may make this vulnerability not applicable (N/A). However if used the HASPINDX dataset must be restricted. Note: If running z/OS V1R11 systems or above and NOT using JES logical log, the HASPINDX data set must be protected. Data sets to be protected may be: SYS1.HASPINDX The following commands are provided as a sample for implementing data set controls: $KEY(S1H) $PREFIX(SYS1) HASPINDX.- UID(syspaudt) R(A) W(A) A(A) E(A) HASPINDX.- UID(sdsf stc) R(A) W(A) E(A) HASPINDX.- UID(audtaudt) R(A) E(A) SET RULE COMPILE 'ACF2.MVA.DSNRULES(S1H)' STORE

b
IBM System Display and Search Facility (SDSF) resources must be properly defined and protected.
AC-4 - Medium - CCI-000035 - V-224319 - SV-224319r868183_rule
RMF Control
AC-4
Severity
Medium
CCI
CCI-000035
Version
ZISFA020
Vuln IDs
  • V-224319
  • V-17947
Rule IDs
  • SV-224319r868183_rule
  • SV-40818
IBM System Display and Search Facility (SDSF) can run with sensitive system privileges, and potentially can circumvent system controls. Failure to properly control access to product resources could result in the compromise of the operating system environment, and compromise the confidentiality of customer data. Many utilities assign resource controls that can be granted to system programmers only in greater than read authority. Resources are also granted to certain non systems personnel with read only authority.
Checks: C-25996r868181_chk

Refer to the following report produced by the ACF2 Data Collection and Data Set and Resource Data Collection: - SENSITVE.RPT(ZISF0020) - ACF2CMDS.RPT(RESOURCE) - Alternate report Automated Analysis requiring additional analysis. Refer to the following report produced by the Data Set and Resource Data Collection: - PDI(ZISF0020) Ensure all IBM SDSF resources are properly protected according to the requirements specified in the Site Security Plan (SSP). The plan should be based on the SDSF SAF Resources table in the z/OS STIG Addendum and validated by the site ISSO. If the following guidance is true, this is not a finding. ___ The ACF2 resources and/or generic equivalent as designated in the above table are defined with a default access of NONE. ___ The ACF2 resource access authorizations restrict access to the appropriate personnel as designated in the above table. ___ The ACF2 resource logging is specified as designated in the above table. ___ The ACF2 resource access authorizations for SDSF GROUP.group-name will require additional analysis to justify access.

Fix: F-25984r868182_fix

The ISSO will work with the systems programmer to verify that the following are properly specified in the ACP. (Note: The resource type, resources, and/or resource prefixes identified below are examples of a possible installation. The actual resource type, resources, and/or resource prefixes are determined when the product is actually installed on a system through the product's installation guide and can be site-specific.) Ensure that all IBM SDSF resources are properly protected according to the requirements specified in the Site Security Plan (SSP). The plan should be based on the SDSF SAF Resources table in the z/OS STIG Addendum and validated by the site ISSO. Use SDSF SAF Resources and SDSF SAF Resource Descriptions tables in the zOS STIG Addendum/SSP. These tables list the resources and access requirements for IBM SDSF; ensure the following guidelines are followed: The ACF2 resources and/or generic equivalent as designated in the above table are defined with a default access of NONE. The ACF2 resource access authorizations restrict access to the appropriate personnel as designated in the above table. The ACF2 resource logging is specified as designated in the above table. The ACF2 resource access authorizations for SDSF GROUP.group-name will require additional analysis to justify access. The following commands are provided as a sample for implementing resource controls: $KEY(ISFATTR) TYPE(SDS) JOBCL.- UID(operaudt) SERVICE(READ,UPDATE) ALLOW JOBCL.- UID(syspaudt) SERVICE(READ,UPDATE) ALLOW - UID(*) PREVENT

b
IBM System Display and Search Facility (SDSF) resources will be properly defined and protected.
AC-4 - Medium - CCI-000035 - V-224320 - SV-224320r868186_rule
RMF Control
AC-4
Severity
Medium
CCI
CCI-000035
Version
ZISFA021
Vuln IDs
  • V-224320
  • V-17982
Rule IDs
  • SV-224320r868186_rule
  • SV-40749
IBM System Display and Search Facility (SDSF) can run with sensitive system privileges, and potentially can circumvent system controls. Failure to properly control access to product resources could result in the compromise of the operating system environment, and compromise the confidentiality of customer data. Many utilities assign resource controls that can be granted to system programmers only in greater than read authority. Resources are also granted to certain non systems personnel with read only authority.
Checks: C-25997r868184_chk

Refer to the following report produced by the ACF2 Data Collection and Data Set and Resource Data Collection: - SENSITVE.RPT(ZISF0021) - ACF2CMDS.RPT(RESOURCE) - Alternate report Automated Analysis Refer to the following report produced by the Data Set and Resource Data Collection: - PDI(ZISF0021) Ensure that all SDSF resources are properly protected according to the requirements specified in the SDSF Server OPERCMDS Resources table in the z/OS STIG Addendum. If the following guidance is true, this is not a finding. ___ The ACF2 resources and/or generic equivalent as designated in the above table are defined with a default access of NONE. ___ The ACF2 resource access authorizations restrict access to the appropriate personnel as designated in the above table. ___ The ACF2 resource logging is specified as designated in the above table.

Fix: F-25985r868185_fix

The ISSO will work with the systems programmer to verify that the following are properly specified in the ACP. Ensure that the IBM SDSF resource access is in accordance with those outlined in SDSF Server OPERCMDS Resources table in the zOS STIG Addendum. Use SDSF Server OPERCMDS Resources table in the zOS STIG Addendum. These tables list the resources and access requirements for IBM SDSF; ensure the following guidelines are followed: The ACF2 resources and/or generic equivalent as designated in the above table are defined with a default access of NONE. The ACF2 resource access authorizations restrict access to the appropriate personnel as designated in the above table. The ACF2 resource logging is specified as designated in the above table. The following commands are provided as a sample for implementing resource controls: $KEY(SDSF) TYPE(OPR) MODIFY.DISPLAY UID(audtaudt) SERVICE(READ) MODIFY.DISPLAY UID(operaudt) SERVICE(READ) MODIFY.DISPLAY UID(syspaudt) SERVICE(READ) MODIFY.- UID(syspaudt) SERVICE(READ,UPDATE,DELETE) LOG - UID(*) PREVENT

b
IBM System Display and Search Facility (SDSF) Started Task name will be properly identified and/or defined to the system ACP.
IA-2 - Medium - CCI-000764 - V-224321 - SV-224321r840238_rule
RMF Control
IA-2
Severity
Medium
CCI
CCI-000764
Version
ZISFA030
Vuln IDs
  • V-224321
  • V-17452
Rule IDs
  • SV-224321r840238_rule
  • SV-40821
IBM System Display and Search Facility (SDSF) requires a started task that will be restricted to certain resources, datasets and other system functions. By defining the started task as a userid to the system ACP, it allows the ACP to control the access and authorized users that require these capabilities. Failure to properly control these capabilities, could compromise of the operating system environment, ACP, and customer data.
Checks: C-25998r840236_chk

Refer to the following report produced by the ACF2 Data Collection: - ACF2CMDS.RPT(ATTSTC) Verify that the logonid(s) for the IBM SDSF started task(s) is (are) properly defined. If the following attributes are defined, this is not a finding. STC

Fix: F-25986r840237_fix

The ISSO working with the systems programmer will ensure the IBM SDSF Started Task(s) is properly identified and/or defined to the System ACP. If the product requires a Started Task, verify that it is properly defined to the System ACP with the proper attributes. Most installation manuals will indicate how a Started Task is identified and any additional attributes that must be specified. The following commands are provided as a sample for defining Started Task(s): SET LID insert SDSF stc name('STC, SDSF')

b
IBM System Display and Search Facility (SDSF) Resource Class will be defined or active in the ACP.
CM-4 - Medium - CCI-000336 - V-224322 - SV-224322r868188_rule
RMF Control
CM-4
Severity
Medium
CCI
CCI-000336
Version
ZISFA038
Vuln IDs
  • V-224322
  • V-18011
Rule IDs
  • SV-224322r868188_rule
  • SV-40830
Failure to use a robust ACP to control a product could potentially compromise the integrity and availability of the MVS operating system and user data.
Checks: C-25999r868187_chk

Refer to the following report produced by the ACF2 Data Collection: - ACF2CMDS.RPT(ACFGSO) If the following GSO CLASMAP record entry(ies) is (are) defined, this is not a finding. CLASMAP.SDSF RESOURCE(SDSF) RSRCTYPE(xxx) ENTITYLN(nn) Note: The site determines the appropriate three-letter RSRCTYPE that is unique for the SDSF. The ENTITYLN must be appropriate for the site's installation.

Fix: F-25987r822587_fix

Use SAF security to define and protect the IBM SDSF resource class(es). Use the following commands as an example: CLASMAP.SDSF RESOURCE(SDSF) RSRCTYPE(SDF) ENTITYLN(39)