Check: RACF-ES-000500
IBM z/OS RACF STIG:
RACF-ES-000500
(in versions v8 r14 through v7 r1)
Title
IBM z/OS SYS1.PARMLIB must be properly protected. (Cat I impact)
Discussion
Without the capability to restrict which roles and individuals can select which events are audited, unauthorized personnel may be able to prevent the auditing of critical events. Misconfigured audits may degrade the system's performance by overwhelming the audit log. Misconfigured audits may also make it more difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. SYS1.PARMLIB contains the parameters that control audit configuration. Unauthorized access could result in the compromise of the operating system environment, ACP, and customer data. Satisfies: SRG-OS-000063-GPOS-00032, SRG-OS-000080-GPOS-00048, SRG-OS-000259-GPOS-00100, SRG-OS-000324-GPOS-00125, SRG-OS-000337-GPOS-00129, SRG-OS-000362-GPOS-00149
Check Content
Execute a dataset list of access to SYS1.PARMLIB. If the ESM data set rules for SYS1.PARMLIB allow inappropriate (e.g., global READ) access, this is a finding. If data set rules for SYS1.PARMLIB do not restrict READ, WRITE or greater access to only systems programming personnel, this is a finding. If data set rules for SYS1.PARMLIB do not restrict READ and UPDATE access to only domain level security administrators, this is a finding. If data set rules for SYS1.PARMLIB 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.PARMLIB do not specify that all (i.e., failures and successes) UPDATE and/or ALTER access will be logged, this is a finding.
Fix Text
Configure access rules for SYS1.PARMLIB as follows: Systems programming personnel will be authorized to WRITE or greater the SYS1.PARMLIB concatenation. Domain level security administrators can be authorized to update the SYS1.PARMLIB concatenation. System Level Started Tasks, authorized Data Center personnel, and auditor can be authorized read access by the ISSO. All WRITE or greater access is logged.
Additional Identifiers
Rule ID: SV-223697r853603_rule
Vulnerability ID: V-223697
Group Title: SRG-OS-000063-GPOS-00032
Expert Comments
CCIs
| Number | Definition |
|---|---|
| CCI-000171 |
The information system allows organization-defined personnel or roles to select which auditable events are to be audited by specific components of the information system. |
| 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-001914 |
The information system provides the capability for organization-defined individuals or roles to change the auditing to be performed on organization-defined information system components based on organization-defined selectable event criteria within organization-defined time thresholds. |
| CCI-002235 |
The information system prevents non-privileged users from executing privileged functions to include disabling, circumventing, or altering implemented security safeguards/countermeasures. |
Controls
| Number | Title |
|---|---|
| AC-3 |
Access Enforcement |
| AC-6 (10) |
Prohibit Non-Privileged Users From Executing Privileged Functions |
| AU-12 |
Audit Generation |
| AU-12 (3) |
Changes By Authorized Individuals |
| CM-5 (6) |
Limit Library Privileges |
| CM-11 (2) |
Prohibit Installation Without Privileged Status |