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transformAggregateCall() captures the datatypes of the aggregate's arguments immediately to construct the Aggref.aggargtypes list. This seems reasonable because the arguments have already been transformed --- but there is an edge case where they haven't been. Specifically, if we have an unknown-type literal in an ANY argument position, nothing will have been done with it earlier. But if we also have DISTINCT, then addTargetToGroupList() converts the literal to "text" type, resulting in the aggargtypes list not matching the actual runtime type of the argument. The end result is that the aggregate tries to interpret a "text" value as being of type "unknown", that is a zero-terminated C string. If the text value contains no zero bytes, this could result in disclosure of server memory following the text literal value. To fix, move the collection of the aggargtypes list to the end of transformAggregateCall(), after DISTINCT has been handled. This requires slightly more code, but not a great deal. Our thanks to Jingzhou Fu for reporting this problem. Security: CVE-2023-5868 |
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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/.