STIGQter: STIG Summary: IBM z/OS ACF2 Security Technical Implementation Guide Version: 8 Release: 2 Benchmark Date: 23 Apr 2021:

IBM z/OS UNIX SUPERUSER resource must be protected in accordance with guidelines.

DISA Rule

SV-223616r533198_rule

Vulnerability Number

V-223616

Group Title

SRG-OS-000080-GPOS-00048

Rule Version

ACF2-US-000010

Severity

CAT I

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.

Weight

10

Fix Recommendation

Configure ACF2 SUPERUSER resources for the UNIXPRIV resource class to restrict to appropriate system tasks and/or system programming personnel.

Configure the ACF2 rules for the SUPERUSER resource to specify a default access of NONE.

Configure no ACF2 rules that allow access to the SUPERUSER resource.

Configure no ACF2 rule for CHOWN.UNRESTRICTED defined.

Configure the ACF2 rules for each of the SUPERUSER resources listed in the UNIXPRIV CLASS RESOURCES Table in the z/OS UNIX System Services Planning, Establishing UNIX security to specify a default access of NONE.

Configure the ACF2 rules for each of the SUPERUSER resources listed in the UNIXPRIV CLASS RESOURCES Table in the z/OS UNIX System Services Planning, Establishing UNIX security to restrict access to appropriate system tasks or systems programming personnel.

Example:
SET R(UNI)
$KEY(SUPERUSER) TYPE(UNI)
$MEMBER(SUPRUSER)
FILESYS UID(sysprgmr LOG
FILESYS.CHOWN UID(sysprgmr) LOG
FILESYS.MOUNT UID(sysprog) LOG
FILESYS.PFSCTL UID(sysprgmr) LOG
FILESYS.VREGISTER UID(sysprgmr) LOG
IPC.RMID UID(sysprgmr) LOG
PROCESS.GETPSENT UID(sysprgmr) LOG
PROCESS.KILL UID(sysprgmr) LOG
PROCESS.PTRACE UID(sysprgmr) LOG
SETPRIORITY UID(sysprgmr) LOG
- UID(*) PREVENT

Check Contents

From the ISPF Command Shell enter:
ACF
RESOURCE(UNI)
LIST LIKE(SUPER-)

If the ACF2 rules for the SUPERUSER resource specify a default access of NONE, this is not a finding.

If there are no ACF2 rules that allow access to the SUPERUSER resource, this is not a finding.

If there is no ACF2 rule for CHOWN.UNRESTRICTED defined, this is not a finding.

If the ACF2 rules for each of the SUPERUSER resources listed in the z/OS UNIX System Services Planning, Establishing UNIX Security, specify a default access of NONE, this is not a finding.

If the ACF2 rules for each of the SUPERUSER resources listed in the UNIXPRIV CLASS RESOURCES Table in the z/OS UNIX System Services Planning, Establishing UNIX Security, restrict access to appropriate system tasks or systems programming personnel, this is not a finding.

Vulnerability Number

V-223616

Documentable

False

Rule Version

ACF2-US-000010

Severity Override Guidance

From the ISPF Command Shell enter:
ACF
RESOURCE(UNI)
LIST LIKE(SUPER-)

If the ACF2 rules for the SUPERUSER resource specify a default access of NONE, this is not a finding.

If there are no ACF2 rules that allow access to the SUPERUSER resource, this is not a finding.

If there is no ACF2 rule for CHOWN.UNRESTRICTED defined, this is not a finding.

If the ACF2 rules for each of the SUPERUSER resources listed in the z/OS UNIX System Services Planning, Establishing UNIX Security, specify a default access of NONE, this is not a finding.

If the ACF2 rules for each of the SUPERUSER resources listed in the UNIXPRIV CLASS RESOURCES Table in the z/OS UNIX System Services Planning, Establishing UNIX Security, restrict access to appropriate system tasks or systems programming personnel, this is not a finding.

Check Content Reference

M

Target Key

4100

Comments