STIGQter: STIG Summary: IBM z/OS TSS Security Technical Implementation Guide Version: 8 Release: 2 Benchmark Date: 23 Apr 2021: STIGQter: STIG Summary: IBM z/OS TSS Security Technical Implementation Guide Version: 8 Release: 2 Benchmark Date: 23 Apr 2021:SV-224019r561402_rule
V-224019
SRG-OS-000368-GPOS-00154
TSS0-OS-000225
CAT II
10
Review all entries contained in the LINKLIST for the actual existence of each library. Develop a plan of action to correct deficiencies.
The Linklist is a default set of libraries that MVS searches for a specified program. This facility is used so that a user does not have to know the library names in which utility types of programs are stored. Control over membership in the Linklist is specified within the operating system. The data set SYS1.PARMLIB(LNKLSTxx) is used to specify the library names. (The xx is the suffix designated by the LNK parameter in the IEASYSxx member of SYS1.PARMLIB, or overridden by the computer operator at IPL.)
Use the following recommendations and techniques to control the exposures created by the LINKLIST facility:
441-1Avoid inclusion of sensitive libraries in the LNKLSTxx member unless absolutely required.
-The LNKLSTxx and PROGxx (LNKLST entries) members will contain only required libraries. On a semiannual basis, Software Support should review the volume serial numbers, and should verify them in accordance with the system catalog. Software Support will remove all nonexistent libraries. The ISSO should modify and/or delete the rules associated with these libraries.
From and ISPF Command line enter:
TSO ISRDDN LINKLIST
Review the list, if there are any DUMMY entries i.e., inaccessible LINKLIST libraries, this is a finding.
V-224019
False
TSS0-OS-000225
From and ISPF Command line enter:
TSO ISRDDN LINKLIST
Review the list, if there are any DUMMY entries i.e., inaccessible LINKLIST libraries, this is a finding.
M
4102