Title

Access to SYS1.LINKLIB is not properly protected. (Cat II impact)

Discussion

This data set is automatically APF-authorized, contains system SVCs and the base PPT. Unauthorized access could result in the compromise of the operating system environment, ACP, and customer data.

Check Content

a) Refer to the following report produced by the Data Set and Resource Data Collection: - SENSITVE.RPT(LINKRPT) Automated Analysis Refer to the following report produced by the Data Set and Resource Data Collection: - PDI(ACP00020) ___ The ACP data set rules for SYS1.LINKLIB allow inappropriate access. ___ The ACP data set rules for SYS1.LINKLIB do not restrict UPDATE and/or ALTER access to only z/OS systems programming personnel. ___ The ACP data set rules for SYS1.LINKLIB do not specify that all (i.e., failures and successes) UPDATE and/or ALTER access will be logged, this is a FINDING. b) If all of the above are untrue, there is NO FINDING. c) If any of the above is true, this is a FINDING.

Fix Text

Review access authorization to critical system files. Evaluate the impact of correcting the deficiency. Develop a plan of action and implement the changes as required. Under the ACPs SYS1.LINKLIB is always indicated as a program control library because it is a member of the MVS link list. Access is limited to system programmers only and all update and allocate access is logged.

Additional Identifiers

Rule ID: SV-109r2_rule

Vulnerability ID: V-109

Group Title: ACP00020

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.