AUTOMATED AST VULNERABILITY REMEDIATION ENGINE

Autonomous Smart Contract Code Auto-Patcher

Transform flagged vulnerabilities into certified OpenZeppelin & CEI compliant patches with interactive side-by-side AST diffing and automated pull request generation.

CWE-841 / SWC-107PATCH READY

Vault Liquidity Withdrawal (Reentrancy Flaw)

Type: Critical Reentrancy

CWE-682 / SWC-114PATCH READY

Spot Price Oracle Calculation (Flash Loan Risk)

Type: Oracle Manipulation

CWE-284 / SWC-105PATCH READY

Privileged Role Transfer (Unprotected Owner Key)

Type: Access Control

Flagged Vulnerable Code (Original)

BEFORE

// ❌ VULNERABLE CODE
function withdrawLiquidity(uint256 amount) external {
    require(userBalances[msg.sender] >= amount, "Insufficient balance");
    
    // External call occurs before balance is updated in storage
    (bool success, ) = msg.sender.call{value: amount}("");
    require(success, "Transfer failed");
    
    userBalances[msg.sender] -= amount;
}

Verified Remediated Code (Patched)

AFTER

// ✅ AUTO-PATCHED CODE (OpenZeppelin 5.0)
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";

function withdrawLiquidity(uint256 amount) external nonReentrant {
    require(userBalances[msg.sender] >= amount, "Insufficient balance");
    
    // 1. CHECKS & EFFECTS: State mutation first
    userBalances[msg.sender] -= amount;
    
    // 2. INTERACTIONS: External call last
    (bool success, ) = msg.sender.call{value: amount}("");
    require(success, "Transfer failed");
}

Remediation Rationale & Fix Details

Applied Checks-Effects-Interactions pattern and OpenZeppelin ReentrancyGuard mutex lock modifier to prevent recursive state hijacking.

+ Added `nonReentrant` modifier+ Moved `userBalances[msg.sender] -= amount` before external call- Eliminated cross-function reentrancy window