Router Header Sanitization for Malicious Packet Prevention
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Solution Overview
Problem
IPv4 and IPv6 packets with duplicate, out-of-sequence, or invalid headers pose security risks by potentially accessing secure networks, damaging files, or spreading malware, as existing network devices often lack effective mechanisms to sanitize such packets.
Innovation Solution
A router with header sanitization logic processes packets to remove duplicate headers, resequence out-of-sequence headers, and validate fragment headers, dropping or re-routing packets with errors to prevent malicious activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If network devices forward packets without header validation, then network throughput is maintained, but security risks increase due to malicious packets with duplicate, out-of-sequence, or invalid headers
Solution Approach 1:
The patent applies preliminary action by validating and sanitizing packet headers before forwarding them through the network. The system checks for duplicate, out-of-sequence, and invalid headers in advance, correcting or dropping problematic packets before they can cause security issues or processing errors downstream, thus maintaining both security and throughput.
Solution Approach 2:
The patent introduces an intermediary sanitization layer between packet reception and forwarding. This intermediary component intercepts packets, performs header validation, and either corrects or drops suspicious packets before they reach the main network flow, acting as a mediator that protects network reliability without significantly impacting throughput.
2Reliability
If network devices implement comprehensive header validation and sanitization, then security against malicious packets is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the header validation process into distinct components: duplicate header detection, out-of-sequence header detection, and invalid header detection. Each component handles a specific aspect of validation, making the overall system more manageable and maintainable while providing comprehensive security.
Solution Approach 2:
The patent applies local quality by implementing targeted validation rules for different types of headers and different error conditions. Rather than applying a uniform complex validation to all packets, the system applies specific validation logic only where needed based on the packet type and detected issues, reducing overall complexity while maintaining effectiveness.
3Speed
If packets with duplicate or out-of-sequence headers are allowed through, then network speed is maintained, but data integrity is compromised
Solution Approach 1:
The patent applies self-service by implementing automatic detection and correction of header sequencing issues without requiring external intervention. The sanitization logic autonomously identifies out-of-sequence headers, reorders them, or drops them as appropriate, maintaining data integrity while minimizing manual configuration and management overhead.
Data Source
AI summary
A network device may receive a packet, determine whether the packet includes two or more headers of a same type, modify the packet to correct for the two or more headers of the same type when the packet includes the two or more headers of the same type, determine whether the packet includes out-of-sequence headers, and modify the packet to correct for the out-of-sequence headers when the packet includes the out-of-sequence headers.