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If role A is a direct or indirect member of role B but does not inherit B's privileges (because at least one relevant grant was created WITH INHERIT FALSE) then A should not be permitted to bypass privilege checks that require the privileges of B. For example, A can't change the privileges of objects owned by B, nor can A drop those objects. However, up until now, it's been possible for A to change default privileges for role B. That doesn't seem to be correct, because a non-inherited role grant is only supposed to permit you to assume the identity of the granted role via SET ROLE, and should not otherwise permit you to exercise the privileges of that role. Most places followed that rule, but this case was an exception. This could be construed as a security vulnerability, but it does not seem entirely clear cut, since older branches were fuzzy about the distinction between is_member_of_role() and has_privs_of_role() in a number of other ways as well. Because of this, and because user-visible behavior changes in minor releases are to be avoided whenever possible, no back-patch. Discussion: http://postgr.es/m/CA+TgmobG_YUP06R_PM_2Z7wR0qv_52gQPHD8CYXbJva0cf0E+A@mail.gmail.com
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.