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If MERGE executes an UPDATE action on a table with row-level security, the code incorrectly applied the WITH CHECK clauses from the target table's INSERT policies to new rows, instead of the clauses from the table's UPDATE policies. In addition, it failed to check new rows against the target table's SELECT policies, if SELECT permissions were required (likely to always be the case). In addition, if MERGE executes a DO NOTHING action for matched rows, the code incorrectly applied the USING clauses from the target table's DELETE policies to existing target tuples. These policies were applied as checks that would throw an error, if they did not pass. Fix this, so that a MERGE UPDATE action applies the same RLS policies as a plain UPDATE query with a WHERE clause, and a DO NOTHING action does not apply any RLS checks (other than adding clauses from SELECT policies to the join). Back-patch to v15, where MERGE was introduced. Dean Rasheed, reviewed by Stephen Frost. Security: CVE-2023-39418
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/.