Dynamic Header Injection for Network Security Intelligence
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Solution Overview
Problem
Existing network security measures, such as the same-origin policy and Content Security Policy (CSP), are inadequate in preventing malicious attacks and detecting compromised websites, as they may not be configured correctly or can be compromised, and security devices struggle to differentiate between legitimate and malicious HTTP/HTTPS connections.
Innovation Solution
A security management system dynamically injects or modifies HTTP/HTTPS headers with security rules into responses from external sites, allowing endpoint devices to report subsequent requests, enabling real-time monitoring and blocking of malicious activities while allowing non-malicious connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Content Security Policy (CSP) headers are configured to prevent malicious attacks, then security protection is improved, but CSP can be misconfigured or compromised rendering it ineffective
Solution Approach 1:
The security management system performs preliminary actions by injecting security rules into HTTP responses before they reach the client. The system proactively adds custom headers containing security policies to outbound responses from internal servers, ensuring security measures are in place before potential attacks occur, rather than relying on post-configuration CSP settings that may be misconfigured or compromised
Solution Approach 2:
The security management system acts as an intermediary between internal servers and external clients. It intercepts HTTP responses from internal servers, injects security rules into the response headers, and forwards the modified responses to clients. This intermediary position allows the system to enforce security policies dynamically without requiring configuration changes on the servers themselves, overcoming the limitation of static CSP configurations
2Difficulty of detecting and measuring
If security devices monitor all HTTP/HTTPS connections to detect malicious activities, then detection capability is improved, but it becomes difficult to differentiate between legitimate and malicious connections
Solution Approach 1:
The system implements feedback mechanisms by injecting headers that request client devices to send back information about their subsequent network requests. When a client receives a response with injected security rules, it is instructed to report subsequent requests made from that response back to the security management system. This feedback loop provides contextual information about the relationship between responses and subsequent requests, enabling the system to differentiate legitimate from malicious activities based on the reported connection patterns
Solution Approach 2:
The system adds another dimension to connection monitoring by not just observing network traffic flows, but by injecting headers that create a reporting dimension. Instead of only analyzing connection patterns at the network level, the system gains insight into the application-level context by having clients report back information about requests made from received responses. This additional dimension of information allows for more accurate differentiation between legitimate and malicious connections
3Reliability
If the same-origin policy is enforced to prevent cross-origin attacks, then security is improved, but it does not prevent sending cross-origin requests which can be used for side-channel attacks
Solution Approach 1:
The security management system acts as an intermediary that injects additional security headers into responses from internal servers. These injected headers work in conjunction with the same-origin policy to provide an additional layer of protection. By controlling what headers are sent to clients, the system can prevent malicious scripts from exploiting cross-origin vulnerabilities while still allowing legitimate same-origin communication
Data Source
AI summary
A method, system, and computer-usable medium are disclosed for receiving a response, by a security management system, from a site external to an internal network comprising the security management system to an endpoint device of the internal network, and injecting a header into the response by the security management system, the header including security rules, such that when the response is communicated to the endpoint device, the endpoint device responds to the security management system with information regarding subsequent requests made by the endpoint device in connection with the response.