Fluid XSS

Following the advice given in this presentation, your Fluid templates and View Helpers will potentially enable various XSS attacks

1. Inspiring people to share Successfully enabling XSS Attacks with Fluid Fluid XSS Successfully enabling XSS Attacks with Fluid Helmut Hummel <info@helhum.io> 12.6.2016 1
2. Cross Site-Scripting 2
3. PHP Templating 3 <input name="foo" value="<?= $_GET['foo'] ?>" />
5. Fluid Templating 5 <input name="foo" value="{foo}" />
7. Fluid How to enable XSS with Fluid • Use variables in <script> tags in Fluid templates • Do NOT use data attributes to store data for JavaScript • Disable children escaping in ViewHelpers • Always pass HTML to ViewHelper arguments to avoid encoding • Always wrap variables with f:format.raw • Never use request format html to avoid encoding 7
8. Inspiring people to share Fluid XSS Successfully enabling XSS Attacks with Fluid Fluid XSS Resources • https://github.com/helhum/fluid_security/commits/master • https://www.owasp.org/index.php/Cross-Site_Scripting 8
9. 9 @helhum http://helhum.io info@helhum.io