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Before we go and discuss the PHP coding tips and techniques to avoid Cross-site scripting (XSS) attacks, lets try and understand quickly what is XSS attack.
XSS is a Web-based attack performed on vulnerable Web applications which ends up victimizing the end user rather than the application itself. In these attacks, malicious content is delivered to users primarily using JavaScript. The XSS attack happens when the web applications accepts the input from the end user without validating it. In XSS attack, the malicious code executes in the context of the victim’s session, allowing the attacker to bypass normal security restrictions. There are multiple good web pages to read about XSS such as OWASP, Wikipedia etc.
define( 'ROOT', $_SERVER['DOCUMENT_ROOT'] ); include_once( ROOT . '/security/SecurityFilter.php' ); $secFilter = new SecurityFilter(); $request = $secFilter->sanitize( $_POST ); // In case, you are using $_GET, use $_GET instead.
The above code should be put as one of the first code in your controller to sanitize input requests, before further processing. The $request array will have all the javascript code removed, thus, avoiding XSS attacks that is done primarily using Javascript code.
Above steps would help you get setup with security coding to avoid XSS within no time.
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For the file "OWASPAdapter.php", I found following code:-
"require_once( ROOT . "/security/owasp-esapi-php/src/reference/WebValidator.php");"
But WebValidator.php doesn't exist in "owasp-esapi-php". Please help! Thank you very much!
seems that WebValidator is a customization of
owasp-esapi-php/src/reference/DefaultValidator.php
unfortunately it doesn't come with default code... i would be interested in it too!
Did you find the WebValidator.php , i have the same problem, webValidator.php not exist!!