[MajorSecurity #23] BLOG:CMS <= 4.0.0j - XSS and cookie disclosure

[MajorSecurity #23] BLOG:CMS <= 4.0.0j - XSS and cookie disclosure

Software: BLOG:CMS

Version: 4.0.0j

Type: Cross site scripting

Made public: July, 22th 2006

Vendor: F-ART AGENCY, Ltd. - Radek Hulбn

Page: http://blogcms.com/

Credits:

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

Original Advisory:

http://www.majorsecurity.de/advisory/major_rls23.txt

Affected Products:

BLOG:CMS 4.0.0j and prior

Description:

BLOG:CMS is the most complete, feature-packed, personal publishing system on the market, developed by Radek Hulбn. It
includes state-of-the-art weblog, forum, wiki engine, news aggregator (atom /rss), and photo gallery.

Requirements:

register_globals = On

Vulnerability:

Input passed directly to the "id" parameter 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".