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IBM z/OS UNIX MVS data sets or HFS objects must be properly protected.


Overview

Finding ID Version Rule ID IA Controls Severity
V-223624 ACF2-US-000090 SV-223624r533198_rule Medium
Description
If the operating system were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that are part of a robust change management process. This requirement applies to operating systems with software libraries that are accessible and configurable, as in the case of interpreted languages. Software libraries also include privileged programs which execute with escalated privileges. Only qualified and authorized individuals must be allowed to obtain access to information system components for purposes of initiating changes, including upgrades and modifications. Satisfies: SRG-OS-000080-GPOS-00048, SRG-OS-000259-GPOS-00100
STIG Date
IBM z/OS ACF2 Security Technical Implementation Guide 2022-06-22

Details

Check Text ( C-25297r504830_chk )
Refer to the proper BPXPRMxx member in SYS1.PARMLIB

If the ESM data set rules for the data sets referenced in the ROOT and the MOUNT statements in BPXPRMxx restrict update access to the z/OS UNIX kernel (i.e., OMVS or OMVSKERN), this is not a finding.

If the ESM data set rules for the data sets referenced in the ROOT and the MOUNT statements in BPXPRMxx restrict update and/or allocate access to systems programming personnel, this is not a finding.
Fix Text (F-25285r504831_fix)
Review the access authorizations defined in the ACP for the MVS data sets that contain operating system components and for the MVS data sets that contain HFS file systems and ensure that they conform to the specifications below Review the UNIX permission bits on the HFS directories and files and ensure that they conform to the specifications below:

Define ESM data set rules for the data sets referenced in the ROOT and the MOUNT statements in BPXPRMxx to restrict update access to the z/OS UNIX kernel (i.e., OMVS or OMVSKERN).

Define ESM data set rules for the data sets referenced in the ROOT and the MOUNT statements in BPXPRMxx to restrict update and/or allocate access to systems programming personnel.