From Oracle Database 12c Security Technical Implementation Guide
Part of SRG-APP-000516-DB-999900
Associated with: CCI-000366
Permissions on objects may be granted to the user group PUBLIC. Because every database user is a member of the PUBLIC group, granting object permissions to PUBLIC gives all users in the database access to that object. In a secure environment, granting object permissions to PUBLIC must be restricted to those objects that all users are allowed to access. The policy does not require object permissions assigned to PUBLIC by the installation of Oracle Database server components be revoked.
A default Oracle Database installation provides a set of predefined administrative accounts and non-administrative accounts. These are accounts that have special privileges required to administer areas of the database, such as the “CREATE ANY TABLE” or “ALTER SESSION” privilege, or “EXECUTE” privileges on packages owned by the SYS schema. The default tablespace for administrative accounts is either “SYSTEM” or “SYSAUX”. Non-administrative user accounts only have the minimum privileges needed to perform their jobs. Their default tablespace is “USERS”.
To protect these accounts from unauthorized access, the installation process expires and locks most of these accounts, except where noted below. The database administrator is responsible for unlocking and resetting these accounts, as required.
Non-Administrative Accounts - Expired and locked:
APEX_PUBLIC_USER, DIP, FLOWS_040100*, FLOWS_FILES, MDDATA, ORACLE_OCM, SPATIAL_CSW_ADMIN_USR, SPATIAL_WFS_ADMIN_USR, XS$NULL
Administrative Accounts - Expired and Locked:
ANONYMOUS, CTXSTS, EXFSYS, LBACSYS, MDSYS, OLAPSYS, OEDDATA, OWBSYS, ORDPLUGINS, ORDSYS, OUTLN, SI_INFORMTN_SCHEMA, WK_TEST, WK_SYS, WKPROXY, WMSYS, XDB
Administrative Accounts - Open:
DBSNMP, MGMT_VIEW, SYS, SYSMAN, SYSTEM
* Subject to change based on version installed
Run the SQL query:
select owner ||'.'|| table_name ||':'|| privilege from dba_tab_privs
where grantee = 'PUBLIC'
and owner not in
();
(With respect to the list of special accounts that are excluded from this requirement, it is expected that the DBA will maintain the list to suit local circumstances, adding special accounts as necessary and removing any that are not supposed to be in use in the Oracle deployment that is under review.)
If there are any records returned that are not Oracle product accounts, and are not documented and authorized, this is a finding.
Note: This check may return false positives where other Oracle product accounts are not included in the exclusion list.
Revoke any privileges granted to PUBLIC for objects that are not owned by Oracle product accounts. From SQL*Plus: revoke [privilege name] from [user name] on [object name]; Assign permissions to custom application user roles based on job functions: From SQL*Plus: grant [privilege name] to [user role] on [object name];
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