Title

Write or greater access to SYS1.NUCLEUS must be limited to system programmers only. (Cat I impact)

Discussion

This data set contains a large portion of the system initialization (IPL) programs and pointers to the master and alternate master catalog. 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(NUCLRPT) Automated Analysis Refer to the following report produced by the a Data Set and Resource Data Collection: - PDI(ACP00080) ___ The ACP data set rules for SYS1.NUCLEUS allow inappropriate access. ___ The ACP data set rules for SYS1.NUCLEUS do not restrict UPDATE and/or ALTER access to only z/OS systems programming personnel. ___ The ACP data set rules for SYS1.NUCLEUS do not specify that all (i.e., failures and successes) UPDATE and/or ALTER access will be logged. 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 required to protect SYS1.NUCLEUS. The IAO will ensure that update and allocate access to SYS1.NUCLEUS is limited to system programmers only and all update and allocate access is logged.

Additional Identifiers

Rule ID: SV-115r3_rule

Vulnerability ID: V-115

Group Title: ACP00080

Expert Comments

CCIs tied to check.

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