STIGQter: STIG Summary: IBM z/OS ACF2 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-223619r561301_rule

Vulnerability Number

V-223619

Group Title

SRG-OS-000080-GPOS-00048

Rule Version

ACF2-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

Configure BPX. SRV.userid resources to be properly protected and access 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.

The default access for each BPX.SRV.userid resource must be no access. Access can be permitted only to system software processes that act as servers under OS/390 UNIX (e.g., web servers) and users whose access an approval are identified in the Site Security Plan.

Example:
SET R(SUR)
$KEY(BPX) TYPE(SUR)
SRV.INTERNAL UID(FJB****STC******IMWEBSRV) SERVICE(READ) LOG
SRV.PRIVATE UID(FJB****STC******IMWEBSRV) SERVICE(READ) LOG
SRV.PUBLIC UID(FJB****STC******IMWEBSRV) SERVICE(READ) LOG
SRV.WEBADM UID(FJB****STC******IMWEBSRV) SERVICE(READ) LOG
- UID(*) PREVENT

Check Contents

From the ISPF Command Shell enter:
ACF
SET RESOURCE(SUR)
SET VERBOSE
LIST LIKE(BPX-)

If the ACF2 rules for all BPX.SRV.user TYPE(SUR) resources specify a default access of NONE, this is not a finding.

If the ACF2 rules for all BPX.SRV.user TYPE(SUR) resources restrict access 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-223619

Documentable

False

Rule Version

ACF2-US-000040

Severity Override Guidance

From the ISPF Command Shell enter:
ACF
SET RESOURCE(SUR)
SET VERBOSE
LIST LIKE(BPX-)

If the ACF2 rules for all BPX.SRV.user TYPE(SUR) resources specify a default access of NONE, this is not a finding.

If the ACF2 rules for all BPX.SRV.user TYPE(SUR) resources restrict access 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

4100

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