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

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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:

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Discovered by: David Vieira-Kurz

http://www.majorsecurity.de

Original Advisory:

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

Affected Products:

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BLOG:CMS 4.0.0j and prior

Description:

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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:

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register_globals = On

Vulnerability:

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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:

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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".

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