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Overly tight coding caused the password transformation loop to stop examining input once it had processed a byte equal to 0x80. Thus, if the given password string contained such a byte (which is possible though not highly likely in UTF8, and perhaps also in other non-ASCII encodings), all subsequent characters would not contribute to the hash, making the password much weaker than it appears on the surface. This would only affect cases where applications used DES crypt() to encode passwords before storing them in the database. If a weak password has been created in this fashion, the hash will stop matching after this update has been applied, so it will be easy to tell if any passwords were unexpectedly weak. Changing to a different password would be a good idea in such a case. (Since DES has been considered inadequately secure for some time, changing to a different encryption algorithm can also be recommended.) This code, and the bug, are shared with at least PHP, FreeBSD, and OpenBSD. Since the other projects have already published their fixes, there is no point in trying to keep this commit private. This bug has been assigned CVE-2012-2143, and credit for its discovery goes to Rubin Xu and Joseph Bonneau. |
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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: http://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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.