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z/OS CL/SuperSession for ACF2 Security Technical Implementation Guide

  • Version/Release: V6R13
  • Published: 2024-02-19
  • Released: 2024-04-24
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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
CL/SuperSession profile options are set improperly.
AC-4 - Medium - CCI-000035 - V-224282 - SV-224282r519718_rule
RMF Control
AC-4
Severity
Medium
CCI
CCI-000035
Version
ZCLS0040
Vuln IDs
  • V-224282
  • V-18014
Rule IDs
  • SV-224282r519718_rule
  • SV-27197
Product configuration/parameters control the security and operational characteristics of products. If these parameter values are improperly specified, security and operational controls may be weakened. This exposure may threaten the availability of the product applications, and compromise the confidentiality of customer data.
Checks: C-25955r519716_chk

a) The following steps are necessary for reviewing the CL/SuperSession options: 1) Request on-line access from the site administrator to view CL/SuperSession parameter settings. 2) Once access to the CL/SuperSession Main Menu has been obtained, select the option for the ADMINISTRATOR menu. 3) From the ADMINISTRATOR menu, select the option for the PROFILE SELECTION menu. 4) From the PROFILE SELECTION menu, select the View GLOBAL Profile option. 5) After selection of the View GLOBAL Profile option, the Update GLOBAL Profile menu appears. From this menu select the profile to be reviewed: - To view the Common profile select: _Common - To view the SUPERSESSION profile select: _SupSess Automated Analysis Refer to the following report produced by the z/OS Data Collection: - PDI(ZCLS0040) b) Compare the security parameters as specified in the Required CL/SuperSession Common Profile Options and Required CL/Superssion Profile Options Tables in the z/OS STIG Addendum against the CL/SuperSession Profile options. c) If all options as specified in the Required CL/SuperSession Common Profile Options and Required CL/Superssion Profile Options Tables in the z/OS STIG Addendum are in effect, there is NO FINDING. d) If any of the options as specified in the Required CL/SuperSession Common Profile Options and Required CL/Superssion Profile Options Tables in the z/OS STIG Addendum is not in effect, this is a FINDING.

Fix: F-25943r519717_fix

The Systems Programmer and IAO will review all session manager security parameters and control options for compliance with the requirements of the z/OS STIG Addendum Required CL/SuperSession Common Profile Options and Required CL/SuperSession Profile Options Tables. Verify that the options are set properly.

b
CL/SuperSession must be properly configured to generate SMF records for audit trail and accounting reports.
AC-4 - Medium - CCI-000035 - V-224283 - SV-224283r952246_rule
RMF Control
AC-4
Severity
Medium
CCI
CCI-000035
Version
ZCLS0041
Vuln IDs
  • V-224283
  • V-22689
Rule IDs
  • SV-224283r952246_rule
  • SV-27198
Product configuration/parameters control the security and operational characteristics of products. If these parameter values are improperly specified, security and operational controls may be weakened. This exposure may threaten the availability of the product applications and compromise the confidentiality of customer data.
Checks: C-25956r952244_chk

a) Version 3 of CL/SuperSession Review the member KLKINNAF in the TLVPARM DD statement concatenation of the CL/SuperSession STC procedure to determine SMF number. (This member is located in SYS3.OMEGAMON.qualifier.RLSPARM.) Version 2 of CL/SuperSession Review the member KLVINNAF in the TLVPARM DD statement concatenation of the CL/SuperSession STC procedure to determine SMF number. (This member is located in SYS3.OMEGAMON.qualifier.RLSPARM.) Refer to the following report produced by the z/OS Data Collection: - EXAM.RPT(SMFOPTS) Automated Analysis (Currently there is no automation for version 3 of CL/SuperSession) Refer to the following report produced by the z/OS Data Collection: - PDI(ZCLS0041) b) If the SMF= field specifies an SMF record number, review the SMFOPTS report to verify SMF is writing that record type. c) If SMF is writing the record number specified by SMF=, there is no finding. d) If the SMF= field does not specify an SMF record number, or SMF is not writing the record number specified by SMF=, this is a finding.

Fix: F-25944r952245_fix

Ensure the Session Manager generates SMF records for audit trail and accounting reports. To provide an audit trail of user activity in CL/SuperSession, configure the Network Accounting Facility (NAF) to require SMF recording of accounting and audit data. Accounting to the journal data set is optional at the discretion of the site. To accomplish this for version 3 of CL/SuperSession, configure the following NAF startup parameters in the KLKINNAF member of the RLSPARM initialization parameter library as follows: DSNAME= dsname - Name of the NAF journal data set. Required only if the site is collecting accounting and audit data in the journal data set in addition to the SMF data. MOD - If the journal data set is used, this parameter should be set to ensure that logging data in the data set is not overwritten. SMF=nnn - SMF record number. This field is mandatory to ensure that CL/SuperSession data is always written to the SMF files.

b
CL/SuperSession Install data sets must be properly protected.
AC-3 - Medium - CCI-000213 - V-224284 - SV-224284r855139_rule
RMF Control
AC-3
Severity
Medium
CCI
CCI-000213
Version
ZCLSA000
Vuln IDs
  • V-224284
  • V-16932
Rule IDs
  • SV-224284r855139_rule
  • SV-27073
CL/SuperSession Install data sets provide the capability to use privileged functions and/or have access to sensitive data. Failure to properly restrict access to their 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-25957r519722_chk

a) Refer to the following report produced by the Data Set and Resource Data Collection: - SENSITVE.RPT(KLSRPT) Automated Analysis: Refer to the following report produced by the Data Set and Resource Data Collection: - PDI(ZCLS0000) b) Verify that access to the CL/SuperSession Install data sets are properly restricted. ___ The ACF2 data set rules for the data sets does not restrict UPDATE and/or ALTER access to systems programming personnel. ___ The ACF2 data set rules for the data sets does not specify that all (i.e., failures and successes) UPDATE and/or ALTER access will be logged. c) If all of the above are untrue, there is NO FINDING. d) If any of the above is true, this is a FINDING.

Fix: F-25945r519723_fix

Ensure that update and allocate access to CL/SuperSession install data sets are limited to system programmers only, and all update and allocate access is logged. Auditors should have READ access. The installing systems programmer will identify and document the product data sets and categorize them according to who will have update and alter access and if required that all update and allocate access is logged. He will identify if any additional groups have update access for specific data sets, and once documented he will work with the ISSO to see that they are properly restricted to the ACP (Access Control Program ) active on the system. The following dataset are an example of data sets to be protected: SYS2.OMEGAMON SYS2.OMEGAMON.V-.TLSLOAD SYS2.OMEGAMON.V-.TLVLOAD SYS3.OMEGAMON SYS3.OMEGAMON.RLSLOAD The following commands are provided as an example for implementing dataset controls: $KEY(SYS2) OMEGAMON.- UID(syspaudt) R(A) W(L) A(L) E(A) OMEGAMON.V-.TLSLOAD UID(syspaudt) R(A) W(L) A(L) E(A) OMEGAMON.V-.TLVLOAD UID(syspaudt) R(A) W(L) A(L) E(A) OMEGAMON.- UID(audtaudt) R(A) E(A) $KEY(SYS3) OMEGAMON.- UID(syspaudt) R(A) W(L) A(L) E(A) OMEGAMON.RLSLOAD UID(syspaudt) R(A) W(L) A(L) E(A) OMEGAMON.- UID(audtaudt) R(A) E(A)

b
CL/SuperSession STC data sets must be properly protected.
CM-5 - Medium - CCI-001499 - V-224285 - SV-224285r868109_rule
RMF Control
CM-5
Severity
Medium
CCI
CCI-001499
Version
ZCLSA001
Vuln IDs
  • V-224285
  • V-17067
Rule IDs
  • SV-224285r868109_rule
  • SV-27093
CL/SuperSession STC data sets provide the capability to use privileged functions and/or have access to sensitive data. Failure to properly restrict access to their 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-25958r868107_chk

Refer to the following report produced by the Data Set and Resource Data Collection: - SENSITVE.RPT(KLSSTC) Automated Analysis: Refer to the following report produced by the Data Set and Resource Data Collection: - PDI(ZCLS0001) Verify that the accesses to the CL/SuperSession STC data sets are properly restricted. If the following guidance is true, this is not a finding. ___ The ACF2 data set access authorizations restrict READ access to auditors and authorized users. ___ The ACF2 data set access authorizations restrict WRITE and/or greater access to systems programming personnel. ___ The ACF2 data set rules for the data sets does not restrict WRITE and/or greater access to the product STC(s) and/or batch job(s).

Fix: F-25946r868108_fix

Ensure that WRITE and/or greater access to CL/SuperSession STC data sets are limited to system programmers and CL/SuperSession STC only. Read access can be given to auditors and 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. The installing systems programmer 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 ensure they are properly restricted to the ACP (Access Control Program) active on the system. Note: The data sets and/or data set prefixes identified below are examples of a possible installation. The actual data sets and/or prefixes are determined when the product is actually installed on a system through the product's installation guide and can be site specific. The following dataset are an example of data sets to be protected: SYS3.OMEGAMON.RLSNAF SYS3.OMEGAMON.RLSNAM SYS3.OMEGAMON.RLSTDB SYS3.OMEGAMON.RLSVLOG The following commands are provided as an example for implementing dataset controls: $KEY(SYS3) OMEGAMON.RLSNAF UID(*) R(A) E(A) OMEGAMON.RLSNAF UID(audtaudt) R(A) E(A) OMEGAMON.RLSNAF UID(syspaudt) R(A) W(A) A(A) E(A) OMEGAMON.RLSNAF UID(stc KLS) R(A) W(A) A(A) E(A) OMEGAMON.RLSNAM UID(*) R(A) E(A) OMEGAMON.RLSNAM UID(audtaudt) R(A) E(A) OMEGAMON.RLSNAM UID(syspaudt) R(A) W(A) A(A) E(A) OMEGAMON.RLSNAM UID(stc KLS) R(A) W(A) A(A) E(A) OMEGAMON.RLSTDB UID(*) R(A) E(A) OMEGAMON.RLSTDB UID(audtaudt) R(A) E(A) OMEGAMON.RLSTDB UID(syspaudt) R(A) W(A) A(A) E(A) OMEGAMON.RLSTDB UID(stc KLS) R(A) W(A) A(A) E(A) OMEGAMON.RLSVLOG UID(*) R(A) E(A) OMEGAMON.RLSVLOG UID(audtaudt) R(A) E(A) OMEGAMON.RLSVLOG UID(syspaudt) R(A) W(A) A(A) E(A) OMEGAMON.RLSVLOG UID(stc KLS) R(A) W(A) A(A) E(A)

b
CL/SuperSession Started Task name is not properly identified / defined to the system ACP.
IA-2 - Medium - CCI-000764 - V-224286 - SV-224286r519730_rule
RMF Control
IA-2
Severity
Medium
CCI
CCI-000764
Version
ZCLSA030
Vuln IDs
  • V-224286
  • V-17452
Rule IDs
  • SV-224286r519730_rule
  • SV-28590
CL/SuperSession 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-25959r519728_chk

a) Refer to the following report produced by the ACF2 Data Collection: - ACF2CMDS.RPT(ATTSTC) b) If the logonid for the CL/SUPERSESSION started task includes MUSASS and NO-SMC, there is NO FINDING. c) If the logonid for the CL/SUPERSESSION started task does not include MUSASS and/or NO-SMC, this is a FINDING.

Fix: F-25947r519729_fix

The Systems Programmer and IAO will ensure that the started task for CL/SuperSession is properly defined. Review all session manager security parameters and control options for compliance. Develop a plan of action and implement the changes as specified. Define the started task userid KLS for CL/SuperSession. Example: INSERT KLS NAME(STC, CL/SuperSession) MUSASS NO-SMC STC

b
CL/SuperSession KLVINNAM member must be configured in accordance with security requirements.
AC-4 - Medium - CCI-000035 - V-224287 - SV-224287r952249_rule
RMF Control
AC-4
Severity
Medium
CCI
CCI-000035
Version
ZCLSA042
Vuln IDs
  • V-224287
  • V-22690
Rule IDs
  • SV-224287r952249_rule
  • SV-27256
CL/SuperSession configuration/parameters control the security and operational characteristics of products. If these parameter values are improperly specified, security and operational controls may be weakened. This exposure may threaten the availability of the product applications, and compromise the confidentiality of customer data.
Checks: C-25960r952247_chk

If one of the following configuration settings is specified for each control point defined in the KLKINNAM member for Version 3 of CL/SuperSession or KLVINNAM member for Version 2 of CL/SuperSession, this is not a finding. DEFAULT DSNAME(SYS3.OMEGAMON.qualifier.RLSNAM) - NORACF - CLASSES=APPCLASS - NODB - EXIT=KLSA2NEV (The following is for z/OS CAC logon processing) DEFAULT DSNAME(SYS3.OMEGAMON.qualifier.RLSNAM) - SAF - CLASSES=APPCLASS - NODB - EXIT=KLSSFPTX

Fix: F-25948r952248_fix

Ensure that the parameter options for member KLKINNAM for Version 3 of CL/SuperSession or KLVINNAM for Version 2 of CL/SuperSession are coded to the below specifications. (Note: The data set identified below is an example of a possible installation. The actual data set is determined when the product is actually installed on a system through the product's installation guide and can be site specific.) Review the member KLKINNAM or KLVINNAM in the TLVPARM DD statement concatenation of the CL/SuperSession STC procedure. (This member is located in SYS3.OMEGAMON.qualifier.RLSPARM.) Ensure all session manager security parameters and control options are in compliance according to the following: DEFAULT DSNAME(SYS3.OMEGAMON.qualifier.RLSNAM) - NORACF - CLASSES=APPCLASS - NODB - EXIT=KLSA2NEV (The following is for z/OS CAC logon processing) DEFAULT DSNAME(SYS3.OMEGAMON.qualifier.RLSNAM) - SAF - CLASSES=APPCLASS - NODB - EXIT=KLSSFPTX

b
CL/SuperSession APPCLASS member is not configured in accordance with the proper security requirements.
AC-4 - Medium - CCI-000035 - V-224288 - SV-224288r519736_rule
RMF Control
AC-4
Severity
Medium
CCI
CCI-000035
Version
ZCLSA043
Vuln IDs
  • V-224288
  • V-22691
Rule IDs
  • SV-224288r519736_rule
  • SV-27259
CL/SuperSession configuration/parameters control the security and operational characteristics of products. If these parameter values are improperly specified, security and operational controls may be weakened. This exposure may threaten the availability of the product applications, and compromise the confidentiality of customer data.
Checks: C-25961r519734_chk

a) Review the member APPCLASS in the TLVPARM DD statement concatenation of the CL/SuperSession STC procedure. (This member is located in SYS3.OMEGAMON.qualifier.RLSPARM.) Automated Analysis Refer to the following report produced by the z/OS Data Collection: - PDI(ZCLS0043) b) If the parameters for the member APPCLASS are configured as follows, there is NO FINDING: VGWAPLST EXTERNAL=APL c) If the parameters for the member APPCLASS are not configured as specified in (b) above, this is a FINDING.

Fix: F-25949r519735_fix

The Systems Programmer and IAO will ensure that the parameter options for member APPCLASS are coded to the below specifications. Review the member APPCLASS in the TLVPARM DD statement concatenation of the CL/SuperSession STC procedure. (This member is located in SYS3.OMEGAMON.qualifier.RLSPARM.) Ensure all session manager security parameters and control options are in compliance according to the following: VGWAPLST EXTERNAL=APL