Developers Forum for XinFin XDC Network

ruslan wing
ruslan wing

Posted on

Checking XDC Network Smart Contracts for Vulnerabilities Using Mythril: A Step-by-Step Guide.

Are you ready to deploy your smart contract on XDC Network but unsure if it’s secure? Look no further! In this article, we’ll walk you through the process of using Mythril to check your smart contract for vulnerabilities. All you need is a little bit of knowledge about smart contracts and Mythril - smartcontract analysis tool. If you’re new to either of these, don’t worry — we’ll provide a brief overview to get you up to speed. So, grab your smart contract code, and let’s get started on making sure it’s secure before deploying it to the XDC network.

Security vulnerabilities in XDC Network smart contracts

Smart contracts are self-executing contracts with the terms of the agreement between buyer and seller being directly written into lines of code. XDC Network is a decentralized platform that runs smart contracts: applications that run exactly as programmed without any possibility of downtime, censorship, fraud, or third-party interference. These features make smart contracts extremely useful in various applications, but they also introduce security risks. It is important to thoroughly check smart contracts for vulnerabilities before deploying them on the XDC Network.

There are many different types of smartcontract vulnerabilities that may be found in smart contracts, and it is important to be aware of the most common ones in order to protect against them. Some examples of the most common vulnerabilities found in smart contracts include as below:

  • Reentrancy vulnerabilities: These occur when a contract allows an external contract to call it multiple times before the first call has been completed, potentially allowing an attacker to drain the contract’s balance.

  • Integer overflows and underflows: These occur when a contract performs arithmetic operations on integers that result in a value that is too large or too small to be represented by the data type being used. This can allow an attacker to manipulate the contract’s state in unexpected ways.

  • Unchecked call return values: This occurs when a contract calls another contract and does not check the return value, potentially allowing an attacker to manipulate the contract’s state.

  • Unrestricted access: This occurs when a contract allows any external contract to access and modify its data, potentially allowing an attacker to manipulate the contract’s state.

  • Lack of input validation: This occurs when a contract does not validate the input it receives, potentially allowing an attacker to send malicious input and exploit the contract.

Using Mythril to scan your smart-contracts for free

One tool that can be used to check XinFin XDC Network smart contracts to scan your smartcontract for free for security vulnerabilities is Mythril. Mythril is an open-source tool that uses symbolic execution to analyze smart contracts and find security vulnerabilities. In this article, we will walk through the steps for how to use Mythril to check a smart contract for vulnerabilities on XDC Network.

Install Mythril

The first step in using Mythril to test an XDC Network smart contract for vulnerabilities is to install the tool. Mythril can be installed using pip, the Python package manager. To install Mythril using pip, open a terminal and run the following command:

pip install mythril

Enter fullscreen mode Exit fullscreen mode

Analyze the smart contract

To analyze the smart contract using Mythril, open a terminal and navigate to the directory where the smart contract code is located. Then, run the following command:

mythril analyze [filename]

Enter fullscreen mode Exit fullscreen mode

Replace [filename] with the file name containing the smart contract code. For example, if the smart contract code is in a file called “XRC-20.sol,” you would run the following command:

mythril analyze MyContract.sol

Enter fullscreen mode Exit fullscreen mode

Mythril will then analyze the smart contract using symbolic execution, which involves creating a symbolic representation of the contract’s code and exploring all possible execution paths. This allows Mythril to identify potential vulnerabilities by examining the interactions between different parts of the smart contract.

During the analysis, Mythril will display a progress bar showing the percentage of the contract that has been analyzed. Once the analysis is complete, Mythril will display a summary of the results, including any vulnerabilities that were found while testing the smart contract.

Review the results

After Mythril has finished analyzing the smart contract, it will report any vulnerabilities it has found. It is essential to review these vulnerabilities carefully and determine whether they pose a risk to the smart contract.

Mythril will classify each vulnerability it finds into one of several categories, including “high,” “medium,” or “low” severity. It is essential to pay attention to vulnerabilities classified as “high” or “medium” severity, as these are the most likely to pose a significant risk to the contract.

You can click on the vulnerability’s name in the report to get more information about a specific vulnerability. This will open a detailed description of the vulnerability, including information about how it can be exploited and what steps can be taken to fix it.

If any vulnerabilities are found, it may be necessary to modify the smart contract code to fix them. This may involve making changes to the contract’s logic, adding additional checks and controls, or adding additional functions to mitigate the vulnerability. Once the changes have been made, running Mythril on the updated contract is recommended to ensure that all vulnerabilities have been fixed.

Using Mythril to check a smart contract for vulnerabilities is a simple and effective way to ensure the contract is secure. Following the steps outlined in this article, you can identify and fix any vulnerabilities in your smart contract before deploying it on the XDC network.

Going further,

For more information on Mythril and other tools for analyzing smart contracts, you can visit the Smart Contract Security Best Practices website ( ). This website provides a wealth of information on best practices for writing and testing secure smart contracts, as well as a list of resources and tools that can be used to help ensure the security of your smart contracts.

Essential tools required for smart contract development

XinFin RemixLearn How to develop smart contract using XinFin Remix

If you have any questions, please feel free to post it on

Discussion (0)