STIGQter: STIG Summary: IBM z/OS ACF2 Security Technical Implementation Guide Version: 8 Release: 2 Benchmark Date: 23 Apr 2021: STIGQter: STIG Summary: IBM z/OS ACF2 Security Technical Implementation Guide Version: 8 Release: 2 Benchmark Date: 23 Apr 2021:SV-223482r533198_rule
V-223482
SRG-OS-000480-GPOS-00227
ACF2-ES-000640
CAT II
10
Review all LOGONIDs with the NON-CNCL attribute. Ensure that only STCs in the trusted list in the IBM z/OS MVS Initialization and Tuning Reference have been granted this authority. Evaluate the impact of correcting the deficiency. Develop a plan of action and implement the changes.
Trusted STCs:
While the actual list may vary based on local site requirements and software configuration, the started tasks listed in the IBM z/OS MVS Initialization and Tuning Reference is an approved list of started tasks that may be considered trusted started procedures.
Guidelines for reference:
Assign the TRUSTED attribute when one of the following conditions applies:
-The started procedure or address space creates or accesses a wide variety of unpredictably named data sets within your installation.
-Insufficient authority to an accessed resource might risk an unsuccessful IPL or other system problem.
-Avoid assigning TRUSTED to a z/OS started procedure or address space unless it is listed here or you are instructed to do so by the product documentation.
Additionally external security managers are candidates for trusted attribute. Any other started tasks not listed or not covered by the guidelines are a finding unless approval by the Authorizing Official AO.
These STCs will be given the following attribute to facilitate access while logging any accesses they would not ordinarily be granted by the access rule sets:
NON-CNCL
Example:
SET LID
CHANGE logonid STC NON-CNCL
From the ACF command screen enter:
SET LID
SET VERBOSE
LIST IF(NON-CNCL)
If only logonids associated with trusted STCs have the NON-CNCL attribute specified, this is not a finding.
TRUSTED STCs:
STCs that are listed as z/OS started tasks and address spaces in the IBM z/OS MVS Initialization and Tuning Reference.
Guidelines for reference:
Assign the TRUSTED attribute when one of the following conditions applies:
-The started procedure or address space creates or accesses a wide variety of unpredictably named data sets within your installation.
-Insufficient authority to an accessed resource might risk an unsuccessful IPL or other system problem.
-Avoid assigning TRUSTED to a z/OS started procedure or address space unless it is listed here or you are instructed to do so by the product documentation.
Additionally external security managers are candidates for trusted attribute.
Any other started tasks not listed or not covered by the guidelines are a finding unless approval by the Authorizing Official AO.
V-223482
False
ACF2-ES-000640
From the ACF command screen enter:
SET LID
SET VERBOSE
LIST IF(NON-CNCL)
If only logonids associated with trusted STCs have the NON-CNCL attribute specified, this is not a finding.
TRUSTED STCs:
STCs that are listed as z/OS started tasks and address spaces in the IBM z/OS MVS Initialization and Tuning Reference.
Guidelines for reference:
Assign the TRUSTED attribute when one of the following conditions applies:
-The started procedure or address space creates or accesses a wide variety of unpredictably named data sets within your installation.
-Insufficient authority to an accessed resource might risk an unsuccessful IPL or other system problem.
-Avoid assigning TRUSTED to a z/OS started procedure or address space unless it is listed here or you are instructed to do so by the product documentation.
Additionally external security managers are candidates for trusted attribute.
Any other started tasks not listed or not covered by the guidelines are a finding unless approval by the Authorizing Official AO.
M
4100