Ensure that LNKAUTH=APFTAB is specified in the IEASYSxx members currently active parmlib data sets

HighLevel 1Manual reviewibm-z

Description

Specifying LINKAUTH=APFTAB in the IEASYSxx member(s) currently active PARMLIB data set(s) allows libraries other than those designated as APF to contain authorized modules by adding to this list all libraries in the LNKLST concatenation when accessed as part of the linklist concatenation. Failure to specify LINKAUTH=APFTAB allows libraries other than those designated as APF to contain authorized modules which could bypass security and violate the integrity of the operating system environment.

How it is checked

Audit method: Manual review

This recommendation cannot be checked automatically. A scan lists it with these instructions when you pass --include-manual.

Issue the following z/OS console command: D IPLINFO Use the following message to determine the xx suffix values for active PARMLIB IEASYSxx members: IEASYS LIST=(xx,..) Check the current PARMLIB IEASYSxx parameters and look for the LNKAUTH parameter. Verify that LNKAUTH=APFTAB.

How it is fixed

Fix method: Guidance or infrastructure patch

Update non-compliant entries in PARMLIB IEASYSxx members and re-IPL the system.

Properties

Operating systems: Any
Tags: ibm-zhardening
Reference: CIS IBM z/OS with RACF Benchmark v1.0.0 - 1.2.9 Ensure that LNKAUTH=APFTAB is specified in the IEASYSxx members currently active parmlib data sets