To use Import, you must have the CREATE SESSION privilege on an Oracle database. This privilege belongs to the CONNECT role established during database creation.
You can perform an import operation even if you did not create the export file. However, keep in mind that if the export file was created by a user with the EXP_FULL_DATABASE role, then you must have the IMP_FULL_DATABASE role to import it. Both of these roles are typically assigned to database administrators (DBAs).