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

[admin () majorsecurity de]

[MajorSecurity #22] Top XL <=1.1 - XSS and cookie disclosure
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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:
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Discovered by: David "Aesthetico" Vieira-Kurz
http://www.majorsecurity.de

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

Affected Products:
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Top XL 1.1 and prior

Description:
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Top XL is a toplist script working with static links.

Requirements:
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register_globals = On

Vulnerability:
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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:
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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".