IBM z/OS BPX.SRV.user SURROGAT resources must be protected appropriately.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-97617	ACF2-ES-000410	SV-106721r1_rule		Medium

Description
In certain situations, software applications/programs need to execute with elevated privileges to perform required functions. However, if the privileges required for execution are at a higher level than the privileges assigned to organizational users invoking such applications/programs, those users are indirectly provided with greater privileges than assigned by the organizations. Some programs and processes are required to operate at a higher privilege level and therefore should be excluded from the organization-defined software list after review.

Description

In certain situations, software applications/programs need to execute with elevated privileges to perform required functions. However, if the privileges required for execution are at a higher level than the privileges assigned to organizational users invoking such applications/programs, those users are indirectly provided with greater privileges than assigned by the organizations. Some programs and processes are required to operate at a higher privilege level and therefore should be excluded from the organization-defined software list after review.

STIG	Date
IBM z/OS ACF2 Security Technical Implementation Guide	2020-06-29

Details

Check Text ( C-96451r1_chk )
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.

Fix Text (F-103293r1_fix)
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). Example: SET R(SUR) $KEY(BPX) TYPE(SUR) SRV.INTERNAL UID(FJB**STC**IMWEBSRV) SERVICE(READ) LOG SRV.PRIVATE UID(FJBSTC**IMWEBSRV) SERVICE(READ) LOG SRV.PUBLIC UID(FJBSTC**IMWEBSRV) SERVICE(READ) LOG SRV.WEBADM UID(FJBSTC***IMWEBSRV) SERVICE(READ) LOG - UID() PREVENT

Fix Text (F-103293r1_fix)

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).

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