Ensure that access to SYSIBM.SYSPLANAUTH is restricted

MediumLevel 1Manual reviewdb2-zos

Description

The SYSIBM.SYSPLANAUTH table records the privileges that are held by users over application plans. PUBLIC should be restricted from accessing this table. The list of all users who have access to a plan should not be exposed to Public. Exposing this list can enable attackers to gain access to your organization's data.

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.

For Db2 internal security users: Issue the following SQL statement to check if PUBLIC has access: SELECT GRANTEE FROM SYSIBM.SYSTABAUTH WHERE TCREATOR = 'SYSIBM' AND TTNAME = 'SYSPLANAUTH' AND GRANTEE = 'PUBLIC'; Output that contains zero rows is considered a successful finding. Otherwise, PUBLIC has SELECT privilege and the remediation steps should be followed. For external security users: Issue the RACF RLIST command to list the profile that controls access to the SYSIBM.SYSPLANAUTH table in the MDSNTB class. Examine the universal access (UACC) and user ... (full steps: CIS section 2.2.16)

How it is fixed

Fix method: Guidance or infrastructure patch

For Db2 internal security users: Issue the following SQL statement to revoke access from PUBLIC: REVOKE ALL ON SYSIBM.SYSPLANAUTH FROM PUBLIC; For external security users: Issue the RACF RALTER command to update the profile and change the UACC setting to NONE. Issue the RACF PERMIT command to remove the ID(*) and specify users or groups.

Properties

Operating systems: Any
Tags: db2-zospermissions
Reference: CIS IBM Db2 13 for z/OS Benchmark v1.0.0 - 2.2.16 Ensure that access to SYSIBM.SYSPLANAUTH is restricted