Secunia

A vulnerability has been reported in MySQL, which potentially can be exploited by malicious people to conduct SQL injection attacks.

The vulnerability is caused due to an error within the server when parsing a query string that is escaped with the "mysql_real_escape_string()" function. This can potentially be exploited in an environment that uses multi-byte character encoding to bypass SQL injection escaping.

The vulnerability is related to:
SA20231

The vulnerability has been reported in version 4.1.19 and 5.0.21. Prior versions may also be affected.

Solution
Update to the fixed versions.
Further details available in Customer Area

Provided and/or discovered by
The vendor credits Josh Berkus and Tom Lane.

Original Advisory
MySQL:
http://dev.mysql.com/doc/refman/4.1/en/news-4-1-20.html
http://dev.mysql.com/doc/connector/j/en/news-5-0-22.html
http://dev.mysql.com/doc/refman/5.1/en/news-5-1-11.html
http://lists.mysql.com/announce/364
http://lists.mysql.com/announce/365
http://bugs.mysql.com/bug.php?id=8378

Other references
Further details available in Customer Area

Deep Links
Links available in Customer Area