CSRF Mitigation via Session State Validation and Interstitial Confirmation
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Solution Overview
Problem
Conventional methods for mitigating Cross-Site Request Forgery (CSRF) attacks, such as using the referrer header and cryptographic processing, are inadequate due to spoofing vulnerabilities and high processing overhead, respectively, in electronic environments.
Innovation Solution
The proposed solution involves validating the source of submissions in an electronic environment by utilizing session or state information stored on both client and server sides, employing interstitial pages to confirm legitimate user actions, and embedding session IDs in hidden form fields to ensure that only authorized requests are processed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cryptographic processing is used to generate and verify signed random numbers, then security against CSRF attacks is improved, but processing overhead and system complexity increase significantly
Solution Approach 1:
The patent extracts the security verification mechanism from complex cryptographic processing and implements it using simpler server-side session state validation. Instead of requiring cryptographic signing and verification of random numbers, the system uses session ID matching between hidden form fields and server-stored session data, eliminating the need for heavy cryptographic operations while maintaining security.
Solution Approach 2:
The patent uses disposable session IDs that are generated for each user interaction and validated once through simple comparison. These session identifiers are short-lived and single-use, replacing the need for complex cryptographic key pairs and signed tokens. The session state is maintained temporarily on the server and discarded after validation, providing security without ongoing cryptographic overhead.
2Ease of manufacture
If the referrer header is used to verify request source, then implementation simplicity is improved, but reliability deteriorates due to spoofing vulnerabilities
Solution Approach 1:
The patent introduces an intermediary mechanism - server-side session state - that mediates between the client request and the security verification. Instead of directly trusting the referrer header or other client-provided indicators, the system uses a session ID stored on the server as an intermediary truth source. The hidden form field contains this session ID, and the server validates it against its stored session data, creating a trusted intermediary layer that cannot be spoofed by malicious sites.
3Reliability
If session validation with interstitial pages is implemented, then security against fraudulent submissions is improved, but user experience and processing time worsen
Solution Approach 1:
The patent performs preliminary security validation by embedding the session ID in the hidden form field before the user submits the form. The session state is pre-established and stored on the server during user authentication. When the form is submitted, the pre-embedded session ID is automatically validated against the server's stored session data, eliminating the need for time-consuming interstitial pages or post-submission verification delays.
Data Source
AI summary
Cross Site Request Forgery (CSRF) and other types of fraudulent submission in an electronic environment can be mitigated using state information that typically is already maintained for various users. Each submission requiring authentication includes a state identifier (ID). The state ID is compared to corresponding a state ID submitted in a relatively secure format, such as in a secure token or cookie. If the state ID matches a state ID in the secure token received from the user, and the state ID is valid, the submission is processed. Otherwise an interstitial page, including the state ID and a secure token, is generated to prompt the user to confirm the submission. A subsequent confirmation submission will contain the proper state ID and the new cookie, and can be processed. If no confirmation is received from the user with a valid state ID, the submission is not processed.