This article is part of web app penetrations test so now let us focus on bypassing ..

 

Let's know how to bypass CAPTCHA with the following steps :-

Playing with parameters :

Everything depends on parameters here so if you DO NOT send parameter that related to the CAPTCHA, or send the CAPTCHA parameter empty , there is a great possibility that you can bypass CAPTCHA by this way

 

Source code :

Going into the source code for the page, remove the lines of code that added to it by Captcha ; this way may success because most CAPTCHA systems are pulled in from an external JavaScript source, so removing couple of lines of code will let you bypass this thing.

 

Its values :

One of the most misconfiguration in CAPTCHA systems is that it's value is found on source page , so it's enough to check the source page to find the value of that CAPTCHA

 

Tesseract OCR tool :

It is an engine that's used to extract the text from the image, the steps to use it is easy, convert the image to PNG, then the syntax to use tesseract is following :- $ tesseract example.png -

 

Conclusion is that CAPTCHA is by-passable, this is one of the reason why google and other huge web applications stopped depends on CAPTCHA, hope we could give you a useful way to bypass CAPTCHA .