Check: ACF2-ES-000330
IBM z/OS ACF2 STIG:
ACF2-ES-000330
(in versions v8 r15 through v8 r12)
Title
CA-ACF2 Access to SYS1.LINKLIB must be properly protected. (Cat II impact)
Discussion
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. The operating system or software configuration management utility must enforce control of software installation by users based upon what types of software installations are permitted (e.g., updates and security patches to existing software) and what types of installations are prohibited (e.g., software whose pedigree with regard to being potentially malicious is unknown or suspect) by the organization. Satisfies: SRG-OS-000080-GPOS-00048, SRG-OS-000259-GPOS-00100, SRG-OS-000324-GPOS-00125, SRG-OS-000362-GPOS-00149
Check Content
Execute a data set list of access to SYS1.LINKLIB. If the ACF2 data set rules for SYS1.LINKLIB allow inappropriate (e.g., global READ) access, this is a finding. If data set rules for SYS1.LINKLIB do not restrict READ, WRITE, and ALLOCATE access to only systems programming personnel, this is a finding. If data set rules for SYS1.LINKLIB do not restrict READ and WRITE access to only domain-level security administrators, this is a finding. If data set rules for SYS1.LINKLIB do not restrict READ access to only system-level Started Tasks, authorized Data Center personnel, and auditors, this is a finding. If data set rules for SYS1.LINKLIB do not specify that all (i.e., failures and successes) WRITE and/or ALLOCATE access will be logged, this is a finding.
Fix Text
Configure the ACF2 rules for SYS1.LINKLIB limit access to system programmers only and all update and allocate access is logged.
Additional Identifiers
Rule ID: SV-223454r918602_rule
Vulnerability ID: V-223454
Group Title: SRG-OS-000080-GPOS-00048
Expert Comments
CCIs
| Number | Definition |
|---|---|
| CCI-000213 |
The information system enforces approved authorizations for logical access to information and system resources in accordance with applicable access control policies. |
| CCI-001499 |
The organization limits privileges to change software resident within software libraries. |
| CCI-001812 |
The information system prohibits user installation of software without explicit privileged status. |
| CCI-002235 |
The information system prevents non-privileged users from executing privileged functions to include disabling, circumventing, or altering implemented security safeguards/countermeasures. |