Defending web applications from Cross-Site Scripting (XSS) attacks is extremely challenging, especially when the application's code can not be updated to fix the issue. This presentation will provide a walk-through of various XSS attack/defense/evasion lessons learned by Trustwave's SpiderLabs Research Team while working with commercial WAF customers, as well as, by receiving thousands of attacks against our public ModSecurity demonstration page. We will highlight cutting-edge XSS protection methods that are external to the web application's code such as Defensive Javascript Content Injection.
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