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WpJobBoard v4.5.1 - Multiple Cross Site Web Vulnerabilities

2017-09-04 13:15
Document Title:
WpJobBoard v4.5.1 - Multiple Cross Site Web Vulnerabilities

References (Source):

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

Vulnerability Class:
Cross Site Scripting - Non Persistent

Current Estimated Price:
500€ - 1.000€

Product & Service Introduction:
WPJobBoard is bundled with 15+ shortcodes, allowing you to easily build completely unique job board and insert
features only when you need it and only where you see fit. WPJobBoard doesn’t limit your website to just a job board.
Along with WPJB, you can still maintain a blog and take advantage of all the other features WordPress and its plugins
and themes offer. You can keep your community and your blog, but you can add a professional job board.

(Copy of the Vendor Homepage: https://wpjobboard.net/features/ )

Abstract Advisory Information:
The vulnerability laboratory core research team discovered multiple client-side cross site web vulnerabilties in the
WpJobBoard v4.5.1 web-application for wordpress.

Vulnerability Disclosure Timeline:
2017-08-18: Non-Public Disclosure (Vulnerability Laboratory - Shared Customer Research Feed)

Discovery Status:

Affected Product(s):
Product: WPJobBoard - Wordpress Plugin (Web-Application) 4.4.4

Product: WPJobBoard - Wordpress Plugin (Web-Application) 4.5.1

Exploitation Technique:

Severity Level:

Technical Details & Description:
Multiple client-side cross site scripting web vulnerabilities has been discovered in the official WpJobBoard v4.5.1
web-application for wordpress.
The client-side cross site vulnerability allows remote attackers to inject own malicious script codes to client-side
browser to web-application.

The vulnerabilities are located in the `query` and `id` parameters of the `wpjb-email`, `wpjb-job`, `wpjb-application`
and `wpjb-membership` modules.
Remote attackers are able to inject own malicious script code to hijack admin session credentials via backend or to
manipulate the backend on client-side
performed requests. The attack vector is non-persistent and the request method to inject is GET. The attacker does not
need a privileged user account to
perform the successful exploitation.

The security risk of the client-side cross site scripting vulnerabilities are estimated as medium with a cvss (common
vulnerability scoring system) count of 3.6.
Exploitation of the client-side cross site scripting web vulnerabilities requires no privileged web-application user
account and only low user interaction.
Successful exploitation of the vulnerability results in non-persistent phishing attacks, session hijacking,
non-persistent external redirect to malicious sources
and non-persistent manipulation of affected or connected web module context.

Request Method(s):
[+] GET

Vulnerable Module(s):
[+] `wpjb-email`
[+] `wpjb-job`
[+] `wpjb-application`
[+] `wpjb-membership`

Vulnerable Parameter(s):
[+] query
[+] id

Affected Module(s):
[+] Backend - Administrator & Moderators

Proof of Concept (PoC):
The client-side cross site scripting vulnerabilities can be exploited by remote attackers without privileged
web-application user account and with low user interaction.
For security demonstration or to reproduce the web-application vulnerability follow the provided information and steps
below to continue.

PoC: Payload
"<iframe+src%3Da+onload%3Dalert(document.cookie)+<div style="1
"<iframe+src%3Da+onload%3Dalert(document.domain)+<div style="1

PoC: Exploitation

PoC: Exploit Code


Solution - Fix & Patch:
The cross site scripting vulnerability can be patched by a secure parse of the vulnerable `query` and `id` parameters.
Disallow the inseration of special chars on parameter requests to prevent client-side script code injection attacks to
compromise session data.
Filter and parse the output location were the execution point occurs by usage of entities. Escape the context only in
case of emergency.
Filter all inserted context that runs through the affected `wpjb-email`, `wpjb-application` and `wpjb-job` modules

Security Risk:
The security risk of the client-side cross site scripting vulnerabilities in the admin control panel are estimated as
medium. (CVSS 3.6)

Credits & Authors:
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri

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 Labs or its
suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of
liability mainly for incidental
or consequential 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. We have no need for criminal activities or membership
requests. We do not publish advisories
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Source: 0/peS/7102/erusolcsidlluf/gro.stsilces

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