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This commit changes libpq so that errors reported by the backend during the protocol negotiation for SSL and GSS are discarded by the client, as these may include bytes that could be consumed by the client and write arbitrary bytes to a client's terminal. A failure with the SSL negotiation now leads to an error immediately reported, without a retry on any other methods allowed, like a fallback to a plaintext connection. A failure with GSS discards the error message received, and we allow a fallback as it may be possible that the error is caused by a connection attempt with a pre-11 server, GSS encryption having been introduced in v12. This was a problem only with v17 and newer versions; older versions discard the error message already in this case, assuming a failure caused by a lack of support for GSS encryption. Author: Jacob Champion Reviewed-by: Peter Eisentraut, Heikki Linnakangas, Michael Paquier Security: CVE-2024-10977 Backpatch-through: 12
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/.