WP External Links v1.80 - Cross Site Vulnerabilities

Document Title:
===============
WP External Links v1.80 - Cross Site Vulnerabilities


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1788


Release Date:
=============
2016-03-23


Vulnerability Laboratory ID (VL-ID):
====================================
1788


Common Vulnerability Scoring System:
====================================
3.5


Product & Service Introduction:
===============================
Open external links in a new window or tab, adding "nofollow", set link icon, styling, SEO friendly options and more. Easy install and go.
Configure settings for all external links on your site. After activating the plugin all options are already set to make your external links SEO friendly. 
Optionally you can also set the target for opening in a new window or tab or styling options, like adding an icon.

(Copy of the Homepage:  https://wordpress.org/plugins/wp-external-links/ )


Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered multiple cross site scripting vulnerabilities in the official WP External Links v1.80 wordpress plugin.


Vulnerability Disclosure Timeline:
==================================
2016-03-24:	Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Affected Product(s):
====================

Exploitation Technique:
=======================
Remote


Severity Level:
===============
Low


Technical Details & Description:
================================
Multiple client-side web vulnerabilities has been discovered in the official WP External Links v1.80 wordpress plugin.
The vulnerability allows remote attackers to inject malicious script codes on the application-side of the vulnerable modules.

The vulnerabilities are located in the `[ignore]`,`[title]`,`[no_icon_class]` and `[class_name]` values of the `wp_external_links-main`, 
`wp_external_links-seo` or `wp_external_links-style` module POST method request. Remote attackers are able to inject script codes to the 
application-side of the affected modules. The attack vector of the issues are persistent and the request method to inject is POST.
The injection point are the input fields and the execution occurs in the main context sub menu after the inject.

The security risk of the application-side vulnerabilities are estimated as medium with a cvss (common vulnerability scoring system) count of 3.5. 
Exploitation of the persistent web vulnerabilities requires a privileged web application user account and low or medium  user interaction. 
Successful exploitation of the vulnerability results in session hijacking, persistent phishing, persistent external redirects, persistent load 
of malicious script codes or persistent web module context manipulation.

Request Method(s):
				[+] POST

Vulnerable Module(s):
				[+] wp_external_links-main
				[+] wp_external_links-seo
				[+] wp_external_links-style

Vulnerable Parameter(s):
				[+] [ignore]
				[+] [title]
				[+] [no_icon_class]
				[+] [class_name]


Proof of Concept (PoC):
=======================
The vulnerability can be exploited by remote attackers with low privileged or restricted user account and with low user interaction.
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.


# PoC :
http://localhost/wordpress/wp-admin/admin.php?page=wp_external_links

wp_external_links-main[ignore] = "></textarea><script>alert(government-labCr4sh.0xgovernment-lab)</script>
wp_external_links-seo[title] = "><script>alert(government-labCr4sh.0xgovernment-lab)</script>
wp_external_links-style[no_icon_class] = "><script>alert(government-labCr4sh.0xgovernment-lab)</script>
wp_external_links-style[class_name] = "><script>alert(government-labCr4sh.0xgovernment-lab)</script>


Security Risk:
==============
The security risk of the application-side cross site scripting web vulnerabilities in the wordpress plugin are estimated as medium. (CVSS 3.5)


Credits & Authors:
==================
Iran Cyber Security Group - Cr4sh.0x [Iran-Cyber.Net] [http://www.vulnerability-lab.com/show.php?user=Iran%20Cyber%20Security]
Special Tnx To : NOFOZI , root3r , Sir.H4m1d , 0day , pi.hack , 0x3a, s4jj4d , whitewolf , jok3r , MoHaMaD-BlAcK ,l3gi0 n , mr.turk ,0xdevil & king_k4li


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