By inspecting the source of HTML page returned, you should be able to write a script that can automatically break this captcha. URL: Įxample 2 In this example, the answer is leaked by the application. Now just delete the captcha=…& and forward the request, you will get a success feedback from the server. Turn on Intercept and then enter the random character in field box and see the interruption. To avoid the error message, the developer checks that a captcha parameter exists before ensuring that its value is correct. In the Burp Proxy tab, ensure “Intercept is off” and visit the Captcha Example 1.Įxample 1 This script is a common issue with badly implemented captcha. Go to Browser settings and in the search box type proxy then select open proxy settings > In connection tabs > Lan settings > Tick Use a proxy server for your LAN > (127.0.0.1 port number 8080) then Click ok. Type the IP address in your browser which you get from Web For Pentester II and hit enter. Type ifconfig for IP address note down the IP address

Now start Virtual Machine Web For Pentester II

Virtual machine > file > new virtual machine > typical> locate the ISO file (Web For Pentester II ) > next > finish Pentesterlab > exercise > category: free > Web For Pentester II > File >ISOĪfter download create new virtual machine The First step is to go to the website for download and run Web For Pentester II. SQL injections,Authentication, Captcha, Authorization, Mass Assignment, Randoms issues, Mango DB injection. Web For Pentester II exercise is a set of the most common web vulnerabilities like When attacking Captcha, and before starting some hardcore coding, make sure there is no logic flaws or some predictability. It’s a vulnerable web application for penetration testing. For testing, I have used Web For Pentester II. Let’s have a look, how a cyber-attacker can Bypass Captcha.

Protecting CSRF with Captcha is not recommended, captcha can be bypassed easily, no matter how hard it is.

To protect our website from bot, CSRF, etc.

What is Captcha?Ī CAPTCHA is a type of challenge-response test used in computing to determine whether the user is human or not. You can also check the POC Video at the end of the article. Today, we are going to demonstrate to bypass Captcha of a web application.

Recaptcha bypass trick