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WP External Links v1.80 - Cross Site Scripting Web Vulnerabilities

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

References (Source):

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

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
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:

Affected Product(s):

Exploitation Technique:

Severity Level:

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-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 :

wp_external_links-main[ignore] =
wp_external_links-seo[title] =
wp_external_links-style[no_icon_class] =
wp_external_links-style[class_name] =

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]
Special Tnx To : NOFOZI , root3r , Sir.H4m1d , 0day , pi.hack , 0x3a,
s4jj4d , whitewolf , jok3r , MoHaMaD-BlAcK ,l3gi0 n , mr.turk ,0xdevil &

Disclaimer & Information:
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including the warranties of merchantability and capability for a
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including direct, indirect, incidental, consequential loss of business
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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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