Smart Contract Rewriting Framework for Automated Vulnerability Patching
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Solution Overview
Problem
Current solutions for upgrading smart contracts in blockchain networks are manual, error-prone, and time-consuming, particularly due to the immutability of deployed contracts and the complexity of ensuring compatibility with existing versions, which poses a significant risk for vulnerabilities like integer overflows that can lead to substantial financial losses.
Innovation Solution
A contract rewriting framework system that includes a vulnerability detection tool, a rewriter tool, and a deployment component, which allows for the identification, patching, and deployment of updated smart contracts within the blockchain network without requiring source code access or specific compiler compatibility, using techniques like bytecode rewriting and trampoline-based approaches to ensure minimal intrusion and compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual upgrading methods are used for smart contracts, then compatibility with existing versions can be maintained, but the process becomes time-consuming and error-prone
Solution Approach 1:
The system performs preliminary vulnerability detection and patch preparation before deployment. The vulnerability detection tool scans the smart contract code beforehand to identify security issues, and the rewriter tool prepares the patched version in advance, allowing for rapid deployment once the patch is ready, thus reducing overall upgrading time while maintaining reliability
Solution Approach 2:
The smart contract system performs self-upgrading through automated bytecode rewriting. The rewriter tool automatically generates patched bytecode based on vulnerability detection results, and the deployment component automatically deploys the updated contract, eliminating the need for manual intervention and reducing both time and human error
2Reliability
If automated vulnerability detection and patching is implemented, then security risks are reduced, but system complexity increases
Solution Approach 1:
The system is divided into three independent modular components: vulnerability detection tool, rewriter tool, and deployment component. Each module performs a specific function and can be developed, maintained, and operated independently, which manages system complexity while providing comprehensive automated security protection
Solution Approach 2:
The rewriter tool acts as an intermediary between the vulnerability detection tool and the smart contract. It receives vulnerability information, automatically generates patched bytecode, and passes it to the deployment component, simplifying the overall system architecture by providing a clear interface between detection and deployment stages
3Adaptability or versatility
If bytecode rewriting is used to patch smart contracts, then source code access and compiler compatibility are not required, but ensuring compatibility with existing contract versions becomes more difficult
Solution Approach 1:
The rewriter tool creates a copy of the original smart contract bytecode and applies patches to the copied version. This approach allows the original contract to remain unchanged and fully compatible with existing versions, while the patched copy provides security improvements. The deployment component then deploys this compatible patched version, maintaining both adaptability and reliability
Data Source
AI summary
A blockchain smart contract rewriting framework system has a vulnerability detection tool, a rewriter tool, and a deployment component. The deployment component obtains a permission to upgrade the smart contract, which granted by a smart contract creator/owner. The contract rewriting framework system retrieves the smart contract from the blockchain network, and passes it to the vulnerability detection tool. The vulnerability detection tool detects a vulnerability in the smart contract, and determines a type of the vulnerability and an instruction location of the vulnerability. The rewriter tool rewrites the smart contract to include a patch for fixing the vulnerability, a patched smart contract being generated by the rewriter tool based on the type of the vulnerability and the instruction location of the vulnerability. The deployment component issues an upgrade transaction including the patched smart contract to the blockchain network, such that the patched smart contract is deployed in the blockchain network.