Web Application XSS Protection via Automatic CSP Header Generation
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Solution Overview
Problem
Existing web applications are vulnerable to cross-site scripting (XSS) attacks due to the lack of separation between code and presentation components, making them incapable of utilizing Content Security Policy (CSP) headers for protection.
Innovation Solution
Automatically modifying web application output by stripping out code components, replacing them with placeholders, and adding correct CSP headers, allowing for real-time transformation into CSP-compliant output without developer intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If web applications are written with separation of code and presentation components to enable CSP headers, then security against XSS attacks is improved, but application complexity and development difficulty increase
Solution Approach 1:
The patent automatically segments the web application output by parsing HTML content and separating script components from presentation components. This is achieved through regex-based pattern matching that identifies script tags, event handlers, and other code elements, then extracts them into separate artifacts while maintaining the presentation layer intact.
Solution Approach 2:
The patent introduces an intermediary processing layer (the server-side script) that sits between the original web application and the browser. This intermediary automatically performs the separation of code and presentation, generates CSP headers, and delivers the processed content to users without requiring developers to modify their existing codebase.
2Reliability
If Content Security Policy headers are implemented to prevent XSS attacks, then security is improved, but compatibility with existing web applications deteriorates
Solution Approach 1:
The patent implements a self-service mechanism where the server automatically processes web application output, extracts script components, and generates appropriate CSP headers without requiring any developer intervention or configuration. The system adapts to existing applications by analyzing their output structure and applying appropriate security policies automatically.
Solution Approach 2:
The patent creates a universal solution that works with existing web applications regardless of their specific framework or technology stack. The processing mechanism is framework-agnostic and can handle various types of web applications by automatically analyzing their output and applying appropriate CSP policies, making it universally applicable across different platforms.
3Reliability
If code components are separated from presentation components and served as separate artifacts, then CSP header functionality is improved, but processing time and server load increase
Solution Approach 1:
The patent applies partial action by selectively processing only the portions of web application output that contain script components or event handlers. Rather than processing entire pages uniformly, the system uses pattern matching to identify and extract only the relevant code portions, reducing overall processing time while maintaining CSP functionality.
Solution Approach 2:
The patent performs preliminary parsing and identification of script components during the request processing phase, before the actual CSP header generation. By pre-identifying script tags and event handlers in the incoming request, the system can efficiently extract and process only the necessary portions, reducing the time required for the actual separation and header generation.
Data Source
AI summary
The present disclosure provides a method and system for transforming web application output that is vulnerable to XSS attacks to CSP-compliant web application output. This transformation is accomplished by parsing the output code to identify headers and script and splitting the headers and script to form CSP-compliant web application output.