Web Application Firewall Tunneling for Secure Data Transmission
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Solution Overview
Problem
Web applications face security vulnerabilities due to improper input parameter validation, leading to exposure to attacks like Cross-Site Scripting (XSS) and SQL injection, where existing Web Application Firewalls (WAFs) often restrict functionality to enhance security, potentially allowing vulnerabilities.
Innovation Solution
Implementing a method for web application firewall tunneling that involves configuring a tunneling application to encode and decode data, using a transformation algorithm like BASE64, to pass unsafe characters through the WAF without disrupting security, and providing error reporting to users, allowing for selective protection on a form field-by-form basis without configuring the WAF.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a Web Application Firewall is configured to block unsafe characters, then security is improved, but functionality is restricted
Solution Approach 1:
The patent introduces an intermediary encoding/decoding mechanism between the client and server that mediates the interaction between unsafe characters and the WAF. The client-side encoder transforms problematic characters into safe representations before transmission, while the server-side decoder restores them after WAF processing, allowing both security enforcement and functional preservation
Solution Approach 2:
The patent changes the parameter representation of unsafe characters through encoding transformations. By converting characters like '<' and '>' into encoded forms such as '%3C' and '%3E', the system modifies the character parameters to bypass WAF blocking while maintaining the original functional intent through subsequent decoding
2Reliability
If encoding and decoding operations are implemented, then data transmission security is improved, but processing complexity increases
Solution Approach 1:
The patent implements self-service encoding and decoding functionality where the client automatically encodes data before submission and the server automatically decodes received data. This automated approach eliminates manual intervention requirements and reduces operational complexity despite adding processing steps
Solution Approach 2:
The patent performs encoding as a preliminary action before data transmission to the WAF. By pre-encoding unsafe characters on the client side before they reach the firewall, the system avoids the need for complex post-WAF processing and simplifies the overall data flow management
3Reliability
If all form fields are protected by WAF, then security coverage is improved, but ease of configuration deteriorates
Solution Approach 1:
The patent applies local quality by enabling selective WAF protection on a per-form-field basis rather than uniformly across all fields. This allows administrators to configure security protection only where needed, improving ease of configuration while maintaining comprehensive security coverage for critical fields
Solution Approach 2:
The patent segments the WAF protection configuration into individual form field units, each with independent security settings. This segmentation allows granular control over which fields require protection, simplifying the configuration process compared to blanket application-wide security policies
Data Source
AI summary
Systems and methods for web application firewall tunneling are disclosed. In one embodiment, the method may include (1) receiving a plurality of characters entered by a user into a field of a HTML page that is executed in a client runtime environment of a client device; (2) executing a client tunneling application to encode at least some of the characters; (3) passing the plurality of characters through the web application firewall; (4) executing a server tunneling application to decode the encoded characters; and (5) providing the plurality of characters, including the decoded characters, to a host application. Parts of the method may be performed by at least one computer processor.