SWAP: Mitigating XSS Attacks Using a Reverse Proxy

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Executive Summary

Due to the increasing amount of Web sites offering features to contribute rich content, and the frequent failure of Web developers to properly sanitize user input, cross-site scripting prevails as the most significant security threat to Web applications. Using cross-site scripting techniques, miscreants can hijack Web sessions, and craft credible phishing sites. Previous work towards protecting against cross-site scripting attacks suffers from various drawbacks, such as practical infeasibility of deployment due to the need for client-side modifications, inability to reliably detect all injected scripts, and complex, error-prone parameterization. This paper introduces SWAP (Secure Web Application Proxy), a server-side solution for detecting and preventing cross-site scripting attacks.

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