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Submission Details
Severity: medium
Invalid

test/utils/helpers.ts

kp8877

The provided code contains several utility functions related to Ethereum smart contract deployment and token management using the Ethers.js library and Hardhat framework. Here are some potential vulnerabilities, along with suggestions for improvements and detailed solutions.

1. Input Validation

Vulnerability: Functions like toEther, fromEther, setupToken, and padBytes don't perform input validation, which could lead to errors or unexpected behavior if invalid inputs are provided.

Improvement: Implement input validation to ensure that the parameters passed to these functions are of the expected types and formats.

Solution:

export const toEther = (amount: string | number) => {
if (typeof amount !== 'string' && typeof amount !== 'number') {
throw new TypeError('amount must be a string or a number');
}
return ethers.parseEther(amount.toString());
}
​
export const fromEther = (amount: bigint) => {
if (typeof amount !== 'bigint') {
throw new TypeError('amount must be a bigint');
}
return Number(ethers.formatEther(amount));
}
​
export const setupToken = async (token: any, accounts: string[], allAccounts = false) => {
if (!Array.isArray(accounts) || accounts.some(acc => typeof acc !== 'string')) {
throw new TypeError('accounts must be an array of strings');
}
// Continue with setup...
}

2. Error Handling

Vulnerability: The code lacks error handling for asynchronous operations, which can lead to unhandled promise rejections.

Improvement: Add try-catch blocks around async function calls to handle potential errors gracefully.

Solution:

export const deploy = async (contractName: string, args: any[] = []) => {
try {
return await ethers.deployContract(contractName, args);
} catch (error) {
console.error(`Deployment failed for ${contractName}:`, error);
throw error; // or handle it in a way that's appropriate for your application
}
}

3. Type Safety

Vulnerability: The usage of any in several function parameters (like args in deploy and deployUpgradeable) reduces type safety and makes the code more prone to runtime errors.

Improvement: Define more specific types for the function parameters.

Solution:

export const deploy = async <T extends any[]>(contractName: string, args: T = []): Promise<Contract> => {
return ethers.deployContract(contractName, args);
}
​
export const setupToken = async (token: TokenContract, accounts: string[], allAccounts = false) => {
// Your implementation...
}

4. Security of Token Transfers

Vulnerability: The setupToken function blindly transfers tokens based on account indices, which could lead to unintentional token distribution if not properly controlled.

Improvement: Add checks to ensure that the token transfer only occurs if the sender has sufficient balance or permissions.

Solution:

export const setupToken = async (token: any, accounts: string[], allAccounts = false) => {
const totalSupply = await token.totalSupply();
const transferAmount = toEther(10000);
if (totalSupply < transferAmount * accounts.length) {
throw new Error('Insufficient token supply for setup.');
}
​
return Promise.all(
accounts.map((account, index) =>
token.transfer(account, toEther(index < 4 || allAccounts ? 10000 : 0))
)
);
}

5. Handling Large Arrays in concatBytes

Vulnerability: The concatBytes function does not check for the size of the input array, which could lead to performance issues or errors with excessively large inputs.

Improvement: Introduce checks to limit the size of the array being processed.

Solution:

export const concatBytes = (values: string[]) => {
if (values.length > 1000) { // Limit to 1000 entries for example
throw new Error('Too many values provided to concatBytes');
}
return values.reduce((res, curr) => (res += curr.substring(2)), '0x');
}

6. Use of Deprecated Methods

Vulnerability: The code might be using deprecated or outdated methods from the Ethers.js library, which can lead to potential bugs or security issues.

Improvement: Ensure that the latest version of Ethers.js is being used and check the documentation for any updates on method usage.

Solution: Regularly review the Ethers.js documentation for the latest features and improvements.

7. Avoid Hardcoding Values

Vulnerability: Hardcoding certain values (like 10000 in the setupToken function) can lead to less flexible code.

Improvement: Make such values configurable or passed as parameters to the functions.

Solution:

export const setupToken = async (token: any, accounts: string[], allAccounts = false, amountPerTransfer: number = 10000) => {
return Promise.all(
accounts.map((account, index) =>
token.transfer(account, toEther(index < 4 || allAccounts ? amountPerTransfer : 0))
)
);
}

Summary

By implementing these improvements, you can enhance the security, performance, and maintainability of the code. Always remember to test your smart contracts thoroughly and consider conducting a security audit for critical contracts before deployment.

Updates

Lead Judging Commences

inallhonesty Lead Judge 11 months ago
Submission Judgement Published
Invalidated
Reason: Lack of quality

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