Is your MySQL install GreenSQL firewalled?

[3] What is GreenSQL?

GreenSQL is an Open Source database firewall used to protect databases from SQL injection attacks. GreenSQL works as a proxy for SQL commands and has built in support for MySQL. The logic is based on evaluation of SQL commands using a risk scoring matrix as well as blocking known db administrative commands (DROP, CREATE, etc). GreenSQL is distributed under the GPL license. You can download it here [4].

More info at: http://www.greensql.net/about [5]