WordPress Form Maker 1.13.3 SQL Injection

`# Exploit Title: WordPress Plugin Form Maker 1.13.3 - SQL Injection  
# Date: 22-03-2019  
# Exploit Author: Daniele Scanu @ Certimeter Group  
# Vendor Homepage: https://10web.io/plugins/  
# Software Link: https://wordpress.org/plugins/form-maker/  
# Version: 1.13.3  
# Tested on: Wordpress 5.1  
  
Description:  
In the Form Maker plugin before 1.13.3 for WordPress, it's possible to  
achieve SQL injection in the function get_labels_parameters in the file  
form-maker/admin/models/Submissions_fm.php with a crafted value of the  
asc_or_desc parameter.  
  
PoC:  
* Go in to Form-Maker menu and select Submissions.  
* Open menu "Select a form" and select an any item for example "Contact Us".  
* Go in to url bar and insert in asc_or_desc parameter a payload such as:  
  
,(case+when+(select+sleep(5)+from+wp_formmaker_submits+limit+1)+then+1+else+2+end)+asc+--+  
  
With this payload the server will sleep for 5 second.  
  
MITRE assigned CVE-2019-10866 for this issue.  
  
Daniele Scanu  
  
  
`