Release date: 2006-05-23
This release contains a variety of fixes from 7.4.12, including patches for extremely serious security issues. For information about new features in the 7.4 major release, see Section E.253.
A dump/restore is not required for those running 7.4.X. However, if you are upgrading from a version earlier than 7.4.11, see Section E.242.
Full security against the SQL-injection attacks described in
CVE-2006-2313 and CVE-2006-2314 might require changes in
application code. If you have applications that embed untrustworthy
strings into SQL commands, you should examine them as soon as
possible to ensure that they are using recommended escaping
techniques. In most cases, applications should be using subroutines
provided by libraries or drivers (such as libpq's
PQescapeStringConn()) to perform string escaping,
rather than relying on ad hoc code to
Change the server to reject invalidly-encoded multibyte characters in all cases (Tatsuo, Tom)
While PostgreSQL has been moving in this direction for some time, the checks are now applied uniformly to all encodings and all textual input, and are now always errors not merely warnings. This change defends against SQL-injection attacks of the type described in CVE-2006-2313.
Reject unsafe uses of \' in string literals
As a server-side defense against SQL-injection attacks of the type described in CVE-2006-2314, the server now only accepts '' and not \' as a representation of ASCII single quote in SQL string literals. By default, \' is rejected only when client_encoding is set to a client-only encoding (SJIS, BIG5, GBK, GB18030, or UHC), which is the scenario in which SQL injection is possible. A new configuration parameter backslash_quote is available to adjust this behavior when needed. Note that full security against CVE-2006-2314 might require client-side changes; the purpose of backslash_quote is in part to make it obvious that insecure clients are insecure.
Modify libpq's string-escaping routines to be aware of encoding considerations and standard_conforming_strings
This fixes libpq-using
applications for the security issues described in CVE-2006-2313 and
CVE-2006-2314, and also future-proofs them against the planned
changeover to SQL-standard string literal syntax. Applications that
use multiple PostgreSQL
connections concurrently should migrate to
PQescapeByteaConn() to ensure that escaping is
done correctly for the settings in use in each database connection.
Applications that do string escaping "by
hand" should be modified to rely on library routines
Fix some incorrect encoding conversion functions
mic_to_euc_tw were all broken to varying
Clean up stray remaining uses of \' in strings (Bruce, Jan)
Fix bug that sometimes caused OR'd index scans to miss rows they should have returned
Fix WAL replay for case where a btree index has been truncated
Fix SIMILAR TO for patterns involving | (Tom)
Fix server to use custom DH SSL parameters correctly (Michael Fuhr)
Fix for Bonjour on Intel Macs (Ashley Clark)
Fix various minor memory leaks