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WordPress WP External Links 1.80 Cross Site Scripting

WordPress WP External Links 1.80 Cross Site Scripting
Posted Mar 24, 2016
Authored by Vulnerability Laboratory, Cr4sh.0x | Site vulnerability-lab.com

WordPress WP External Links plugin version 1.80 suffers from a cross site scripting vulnerability.

tags | exploit, xss
SHA-256 | a34f4538a4c9325151bde2437a0e1686850704ddc19ef3969368b127aefe3005

WordPress WP External Links 1.80 Cross Site Scripting

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


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


Release Date:
=============
2016-03-24


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):
====================
FreelancePHP
Product: WP External Links - WordPress Plugin (Web-Application) 1.8


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


Severity Level:
===============
Medium


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 to 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('Cr4sh.0x')</script>
wp_external_links-seo[title] = "><script>alert('Cr4sh.0x')</script>
wp_external_links-style[no_icon_class] = "><script>alert('Cr4sh.0x')</script>
wp_external_links-style[class_name] = "><script>alert('Cr4sh.0x')</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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