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The internal commands in REFRESH MATERIALIZED VIEW CONCURRENTLY are correctly executed in SECURITY_RESTRICTED_OPERATION mode, except for creating the temporary "diff" table, because you cannot create temporary tables in SRO mode. But creating the temporary "diff" table is a pretty complex CTAS command that selects from another temporary table created earlier in the command. If you can cajole that CTAS command to execute code defined by the table owner, the table owner can run code with the privileges of the user running the REFRESH command. The proof-of-concept reported to the security team relied on CREATE RULE to convert the internally-built temp table to a view. That's not possible since commit b23cd185fd, and I was not able to find a different way to turn the SELECT on the temp table into code execution, so as far as I know this is only exploitable in v15 and below. That's a fiddly assumption though, so apply this patch to master and all stable versions. Thanks to Pedro Gallegos for the report. Security: CVE-2023-5869 Reviewed-by: Noah Misch
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. Copyright and license information can be found in the file COPYRIGHT. General documentation about this version of PostgreSQL can be found at: https://www.postgresql.org/docs/devel/ In particular, information about building PostgreSQL from the source code can be found at: https://www.postgresql.org/docs/devel/installation.html The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.