STIGQter: STIG Summary: IBM z/OS TSS Security Technical Implementation Guide Version: 8 Release: 2 Benchmark Date: 23 Apr 2021:

IBM z/OS UNIX resources must be protected in accordance with security requirements.

DISA Rule

SV-224077r695477_rule

Vulnerability Number

V-224077

Group Title

SRG-OS-000080-GPOS-00048

Rule Version

TSS0-US-000040

Severity

CAT II

CCI(s)

• CCI-000213 - The information system enforces approved authorizations for logical access to information and system resources in accordance with applicable access control policies.
• CCI-002233 - The information system prevents organization-defined software from executing at higher privilege levels than users executing the software.

Weight

10

Fix Recommendation

Ensure that BPX. SRV.userid resources are properly protected and access is restricted to appropriate system tasks or systems programming personnel.

SURROGAT class BPX resources are used in conjunction with server applications that are performing tasks on behalf of client users that may not supply an authenticator to the server. This can be the case when clients are otherwise validated or when the requested service is performed from userids representing groups.

Ensure there is a TSS owner defined for the (BPX.) SURROGAT class resource.
For Example:
TSS ADD(dept) SURROGAT(BPX.)

Ensure the TSS rules for all BPX.SRV.user SURROGAT resources restrict access to system software processes (e.g., web servers) that act as servers under z/OS UNIX and to users whose access and approval are identified in the Site Security Plan.

For Example:
TSS PERMIT(<websrv>) SURROGAT(BPX.SRV.<webadm>)
ACCESS(READ)

Check Contents

From the ISPF Command Shell enter:
TSS WHOOWNS SURROGAT(*)

If the TSS resources and/or generic equivalent for BPX. is not owned enter:
TSS LIST RDT

If the TSS resources and/or generic equivalent for BPX. is not owned or DEFPROT is specified for the resource class, this is a finding.

From the ISPF Command Shell enter:
TSS WHOHAS SURROGAT(BPX.)

If the TSS resource access authorizations restrict BPX.SRV.user to system software processes (e.g., web servers) that act as servers under z/OS UNIX, this is not a finding.

If the RACF rules for all BPX.SRV.user SURROGAT resources restrict access to authorized users identified in the Site Security Plan, this is not a finding.

Vulnerability Number

V-224077

Documentable

False

Rule Version

TSS0-US-000040

Severity Override Guidance

From the ISPF Command Shell enter:
TSS WHOOWNS SURROGAT(*)

If the TSS resources and/or generic equivalent for BPX. is not owned enter:
TSS LIST RDT

If the TSS resources and/or generic equivalent for BPX. is not owned or DEFPROT is specified for the resource class, this is a finding.

From the ISPF Command Shell enter:
TSS WHOHAS SURROGAT(BPX.)

If the TSS resource access authorizations restrict BPX.SRV.user to system software processes (e.g., web servers) that act as servers under z/OS UNIX, this is not a finding.

If the RACF rules for all BPX.SRV.user SURROGAT resources restrict access to authorized users identified in the Site Security Plan, this is not a finding.

Check Content Reference

M

Target Key

4102

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