bugtraq - [MajorSecurity #23] BLOG:CMS <= 4.0.0j

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Date: 21 Jul 2006 19:18:23 -0000
From: admin@...orsecurity.de
To: bugtraq@...urityfocus.com
Subject: [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 Hulán

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 Hulán. 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".