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Three locations use Assert() to guard against a mismatch between the number of columns advertised in the RELATION message and the number actually received in the subsequent INSERT/UPDATE tuple message. Since these values originate from the publisher, the check must survive into production builds. A malicious or buggy publisher can send a RELATION claiming N columns and an INSERT claiming M < N columns. The subscriber's apply worker indexes into colvalues[]/colstatus[] using column indices from the RELATION message's attribute map, causing a heap out-of-bounds read when the tuple's column array is smaller than expected. We've looked, without success, for a scenario in which the publisher holds sufficient control over these out-of-bounds bytes to exploit this or even to reach a SIGSEGV. Despite not finding one, the code has been fragile. Back-patch to v14 (all supported versions). Reported-by: Varik Matevosyan <varikmatevosyan@gmail.com> Author: Varik Matevosyan <varikmatevosyan@gmail.com> Discussion: https://postgr.es/m/CA+bBoog3cCogktzfLb9bppUByu-10B3CFp8u=iKXG_OvtAguCw@mail.gmail.com Backpatch-through: 14
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/.