[MajorSecurity #22] Top XL <=1.1 - XSS and cookie disclosure

[MajorSecurity #22] Top XL <=1.1 - XSS and cookie disclosure

Software: Top XL

Version: <=1.1

Type: Cross site scripting and cookie disclosure

Made public: July, 20th 2006

Vendor: http://www.paddelberg.de

Page: http://www.paddelberg.de

Rated as: Low Risk

Credits:

Discovered by: David "Aesthetico" Vieira-Kurz
http://www.majorsecurity.de

Original Advisory:

http://www.majorsecurity.de/advisory/major_rls22.txt

Affected Products:

Top XL 1.1 and prior

Description:

Top XL is a toplist script working with static links.

Requirements:

register_globals = On

Vulnerability:

Input passed directly to the "pass" and "pass2" parameter in "add.php" and the "id" parameter in Members Area("/members/index.php")
is not properly sanitised before being returned to the user.
This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.
It works with a script code like this:

>'><script>alert('MajorSecurity')</script><!–

Solution:

Edit the source code to ensure that input is properly sanitised.
You should work with "htmlspecialchars()" or "htmlentities()" php-function to ensure that html tags
are not going to be executed. You should also work with the "intval()" php-function to ensure that the input
is numeric.

Example:
<?php
$pass = htmlentities($_POST['pass']);
echo htmlspecialchars("<script");
$id = intval($_POST['id']);
?>

Set "register_globals" to "Off".