Client-Side Taint Protection via Taint-Aware JavaScript Framework
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Solution Overview
Problem
Current taint protection methods, such as dynamic taint tracking, incur significant performance penalties when dealing with cross-site scripting (XSS) attacks due to the need to parse large and frequent HTTP responses, which is not tolerable in modern web applications.
Innovation Solution
Implementing client-side taint protection using a taint-aware JavaScript framework that processes HTTP responses with a taint-enhanced data format, allowing taint information to be carried alongside string data values, and utilizing a custom TaintString object to sanitize data before it is inserted into the DOM, thereby minimizing performance overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dynamic taint tracking is used to protect against XSS attacks by parsing HTTP responses, then taint protection effectiveness is improved, but performance penalty increases significantly
Solution Approach 1:
The patent segments the taint tracking process by separating taint propagation from full syntax parsing. Instead of parsing entire HTTP responses to detect tainted data, the system attaches taint metadata to individual data elements as they are generated or received, enabling selective verification only of tainted portions without processing the complete response structure.
Solution Approach 2:
The patent applies preliminary action by pre-marking data elements with taint metadata at the point of generation or reception, before they are processed or displayed. This allows the system to identify and handle only the tainted data elements subsequently, rather than performing comprehensive parsing of all data to determine which portions require security verification.
2Measurement precision
If complete parsing of HTTP responses is performed for taint protection, then detection accuracy is improved, but computational overhead increases
Solution Approach 1:
The patent applies local quality by focusing computational resources only on tainted data elements rather than uniformly processing the entire HTTP response. The taint metadata enables the system to identify specific local portions of data that require verification, applying parsing and analysis only to those marked elements while leaving the rest of the response unprocessed.
Solution Approach 2:
The patent implements partial action by performing syntax parsing only on tainted data elements rather than on the complete HTTP response. This selective approach applies the necessary verification action only where needed (to tainted portions) while avoiding redundant processing of clean data, thereby reducing overall computational overhead while maintaining detection accuracy.
3Reliability
If taint information is propagated through all derived data, then security coverage is improved, but data processing complexity increases
Solution Approach 1:
The patent introduces an intermediary mechanism in the form of metadata attached to data elements. This metadata acts as a carrier for taint information, enabling the propagation of security state through data transformations and derivations without requiring complex analysis of data relationships. The metadata serves as a simple intermediary that tracks taint status through various processing operations.
Data Source
AI summary
Methods, systems, and computer-readable storage media for receiving, by a web browser executing on a client-side device, a response from a server, the response provided in a taint-enhanced data format, processing, by a Javascript framework executed by the web browser, the response to parse data within the response and, for any data values marked as tainted, providing respective taint string Javascript objects as sanitized data, and providing the sanitized data to a document object model (DOM).