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POXSS PHP Input/Output
 

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    <p>Hi Question about XSS and PHP......</p> <p>I am building a PHP Application all input is going to the database via client then server side validation, sanitization using filtervar.....encrypted passwords stored in the database, if I a type in scripttag -- whatever -- script tag it gets stored in the database as just that, and it can't do any harm there.</p> <p>Is XSS only a threat when input is being directly outputted and and the only time to use htmlentities is at the point of outputting inputted data from the user.</p> <p>My App doesn't do this, but is there a way for a would be attacker to inject some malicious code and cause it to be outputted, even though my programming logic doesn't allow for this.</p> <p>I want to have all bases covered.........</p> <p>Look forward to your answers......... Yes I'm using PDO prepared statements, bindParam, execute to prevent SQL Injection, and to store the data safely in the database, I'm also using : </p> <pre><code> if(filter_var($_POST['firstname'], FILTER_SANITIZE_STRING)){ $clean['firstname'] = $_POST['firstname']; }; </code></pre> <p>For the Sanitization could that be improved on........... </p> <p>I just fixed the code, the if statement was preventing the filter var from sanitizing the script tags see below : </p> <pre><code>$clean = array(); $clean['firstname'] = (filter_var($_POST['firstname'], FILTER_SANITIZE_STRING)); $clean['lastname'] = (filter_var($_POST['lastname'], FILTER_SANITIZE_STRING)); $clean['username'] = (filter_var($_POST['username'], FILTER_SANITIZE_STRING)); </code></pre> <p>Now the script tags are no longer in the database......... </p>
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