Anonymous Autodiscover Response Filtering Against Phishing Redirects
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Solution Overview
Problem
Anonymous Autodiscover services in electronic messaging systems are vulnerable to security breaches and phishing attacks due to the lack of client authentication, allowing malicious entities to exploit these services for unauthorized access and information theft.
Innovation Solution
Implement a mechanism in the Autodiscover service to identify the type of client requesting services, providing a non-standard response to thin clients to prevent redirection to malicious endpoints and blocking potential security threats, while offering standard responses to trusted rich clients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If anonymous Autodiscover service is provided without authentication, then service efficiency and ease of operation are improved, but security vulnerability and harmful factors increase
Solution Approach 1:
The patent applies local quality by differentiating response behavior based on client type. Trusted rich clients receive standard Autodiscover responses with service endpoint information, while thin clients receive non-standard responses that prevent exploitation. This localized differentiation allows the system to maintain ease of operation for legitimate users while blocking security threats from malicious thin clients.
Solution Approach 2:
The patent introduces an intermediary mechanism that analyzes incoming Autodiscover requests and determines the client type before providing responses. This intermediary layer evaluates request characteristics and mediates between the anonymous service requirement and security concerns, allowing legitimate access while preventing phishing attacks without requiring full authentication.
2Reliability
If authentication is required for Autodiscover service, then security is improved, but service efficiency and ease of operation deteriorate
Solution Approach 1:
The patent applies partial action by implementing selective authentication. Instead of requiring full authentication for all clients, the system performs partial verification by analyzing request characteristics to identify thin clients versus rich clients. This partial authentication approach maintains security by blocking malicious requests while preserving service efficiency for legitimate users through anonymous access.
Solution Approach 2:
The patent changes the parameter of authentication requirement based on client type. For trusted rich clients, the authentication parameter is set to optional or bypassed, maintaining service efficiency. For suspicious thin clients, the authentication parameter is effectively enforced through response denial, ensuring security. This dynamic parameter adjustment resolves the contradiction between security and efficiency.
3Stability of the object's composition
If standard response is provided to all clients, then service consistency is maintained, but security against phishing attacks is compromised
Solution Approach 1:
The patent applies local quality by providing different response types based on client characteristics. Trusted rich clients receive standard consistent responses with service endpoint information, maintaining service consistency for legitimate users. Thin clients receive non-standard responses that do not include exploitable endpoint information, preventing phishing attacks. This localized response differentiation resolves the contradiction between consistency and security.
Solution Approach 2:
The patent segments the response mechanism into two distinct paths: one for rich clients and one for thin clients. The segmentation allows the system to maintain service consistency within each segment while applying different security measures. Rich clients experience consistent standard service, while thin clients experience a segmented response that blocks exploitation, thereby resolving the contradiction between overall consistency and phishing prevention.
Data Source
AI summary
A method and system for securing an anonymous discovery service may include receiving a request from a client device, the request being directed to an anonymous Autodiscover service, identifying a source from which the request originated from within the client device, and responsive to the source being of a first type of sources, transmitting a first response to the client and responsive to the source being of a second type of sources transmitting a second response to the client. The first response does not return a Uniform Resource Locator (URL) to a service endpoint, the second response returns a URL to a service endpoint. Furthermore, the anonymous discovery service may be a discovery service that requires no authentication.