Wordpress “Nextend Twitter Connect”
===================================
Document Title:
===============
WordPress “Nextend Twitter Connect” Plugin Version: 1.5.1 is vulnerable to Reflected XSS (Cross Site Scripting)


Download URL:

=============

https://wordpress.org/plugins/nextend-twitter-connect/



Release Date:

=============
2015-06-20


Vulnerability CVE ID:

=====================
CVE-2015-4557


Vulnerability Disclosure Timeline:

==================================
2015 – 06 – 15 First notified to WordPress.
2015 – 06 – 15 First notified to plugin vendor .
2015 – 06 – 15 First notified to Mitre for CVE number.
2015 – 06 – 16 Vendor publish update for the plugin.
2015 – 06 – 22 Public Disclosure.


Discovery Status:

=================

Published


Severity Level:

===============

High


Technical Details, Description & Proof of Concept (PoC):

========================================================

After installing Wordpress I add the plugin "Nextend Twitter Connect" witch allow you to login Wordpress with Twitter account.

During my test I find out that the “redirect_to” parameter is vulnerable to Reflected XSS attack.
http://www.siz.co.il/my.php?i=hvmwzqo0tmjw.png


To reach to root of the problem, I took a look in the plugin source code and realized that the “new_Twitter_sign_button” witch located in the file “nextend-Twitter-connect.php”.

The problematic function are locate in line 492:
http://www.siz.co.il/my.php?i=bndijzkozjdy.png


As you can see in the line 492, the function don’t escapes HTML tags or other dangerous symbols.

When attacker injects the Javascript code in the URL the function runs the code, as you can see:

http://www.siz.co.il/my.php?i=ni4jzmzjmrni.png

And pop the alert window.


Solution - Fix & Patch:

=======================

In order to solve this security flaw you need to add the “htmlentities” function. (http://php.net/htmlentities)

As you can see in the image:
http://www.siz.co.il/my.php?i=yjz4jmie4m1g.png



Wordpress “Nextend Google Connect”
===================================
Document Title:
===============
WordPress “Nextend Google Connect” Plugin Version: 1.5.1 is vulnerable to Reflected XSS (Cross Site Scripting)


Download URL:

=============

https://wordpress.org/plugins/nextend-google-connect/



Release Date:

=============
2015-06-20


Vulnerability CVE ID:

=====================
CVE-2015-4557


Vulnerability Disclosure Timeline:

==================================
2015 – 06 – 15 First notified to WordPress.
2015 – 06 – 15 First notified to plugin vendor .
2015 – 06 – 15 First notified to Mitre for CVE number.
2015 – 06 – 16 Vendor publish update for the plugin.
2015 – 06 – 22 Public Disclosure.


Discovery Status:

=================

Published


Severity Level:

===============

High


Technical Details, Description & Proof of Concept (PoC):

========================================================

After installing Wordpress I add the plugin "Nextend Google Connect" witch allow you to login Wordpress with Google account.

During my test I find out that the “redirect_to” parameter is vulnerable to Reflected XSS attack.
http://www.siz.co.il/my.php?i=yzjzqwyn4qo3.png


To reach to root of the problem, I took a look in the plugin source code and realized that the “new_google_sign_button” witch located in the file “nextend-Google-connect.php”.

The problematic function are locate in line 433:

http://www.siz.co.il/my.php?i=z4dnntazxkmz.png


As you can see in the line 433, the function don’t escapes HTML tags or other dangerous symbols.

When attacker injects the Javascript code in the URL the function runs the code, as you can see:

http://www.siz.co.il/my.php?i=0omtugeig1z0.png



And pop the alert window.


Solution - Fix & Patch:

=======================

In order to solve this security flaw you need to add the “htmlentities” function. (http://php.net/htmlentities)

As you can see in the image:
http://sizmedia.com/my.php?i=zmnjdljwthmm.png


Liran Segal (Bugsec Information Security LTD)

Regards,
Liran Segal
Penetration Testing
BugSec Cyber & Information Security

____________________________________________________________________________________________________________________________________________________________________________________________


Office: 03-9622655 Fax: 03-9511433 Mobile: 054-8308351

Mail: lirans@bugsec.com<mailto:lirans@bugsec.com> Site: www.bugsec.com<http://www.bugsec.com/>

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