Smart Contract Security Audit Report

Produced by: BevorAI Agent

🛑 Disclaimer: This report is generated by the BevorAI Agent, an experimental AI-based auditing tool. While every effort is made to ensure accuracy, this report should not replace a professional, human audit.

⚠️ Severity Level Definitions

Critical: 🚨 Issues that can lead to contract compromise or significant financial losses.
High: 🔴 Severe bugs that may result in major exploits or disruptions.
Medium: 🟠 Moderate risks with potential functional or security impacts.
Low: 🟢 Minor issues with limited risk or impact.

📝 Audit Summary

Contract Address: 0xA894D982C61bfe7d424958722860E0DD685196B9
Audit Date: 2025-03-15
Auditor: BevorAI Agent

🧐 Introduction

The BeeperCoin contract is an ERC20 token designed to facilitate transactions and manage gas claims for its deployer. It incorporates standard ERC20 functionalities while also allowing the deployer to claim gas fees.

🔍 Audit Scope

The audit focused on identifying vulnerabilities related to access control, control flow, data handling, economic exploits, unsafe logic, and unsafe math within the BeeperCoin smart contract.

🛠 Findings

🚨 Critical

Insufficient Access Control

Explanation: The claimGas function is only restricted by the check against deployer. After the constructor runs, the ownership is transferred to address(0), allowing any address to call claimGas and withdraw funds from the contract.
Recommendation: Remove the ownership transfer to address(0) in the constructor. Maintain the deployer as the owner or implement a proper ownership transfer mechanism.
Code Reference: Constructor: constructor (string memory name_, string memory symbol_) ERC20(name_, symbol_) { _mint(msg.sender, 1000000000000000000000000); deployer = msg.sender; }

🔴 High

Reentrancy Vulnerability in claimGas Function

Explanation: The claimGas function allows the deployer to send Ether to a recipient using the sendValue function. If the recipient is a contract that calls back into the claimGas function, it could lead to unexpected behavior or reentrancy attacks.
Recommendation: Implement a reentrancy guard or follow the checks-effects-interactions pattern by updating the state before making external calls.
Code Reference: Address.sendValue(recipient, amount); in claimGas function.

DoS with Unexpected Revert in claimGas Function

Explanation: If the recipient contract reverts during the Ether transfer, the entire transaction will revert, preventing the deployer from sending gas to legitimate recipients.
Recommendation: Consider using a pattern that allows the function to handle failures gracefully, such as logging the failure without reverting the entire transaction.
Code Reference: Address.sendValue(recipient, amount); in claimGas function.

Transaction-Ordering Dependence

Explanation: The claimGas function can be called by anyone if they can impersonate the deployer. A malicious actor could front-run this transaction to manipulate the state or the recipient address.
Recommendation: Implement checks to ensure that only the deployer can call this function and consider using a nonce or timestamp to prevent replay attacks.
Code Reference: claimGas function.

🟠 Medium

Unchecked Return Value

Explanation: The sendValue function calls recipient.call{value: amount}(''), which can fail if the recipient does not handle the incoming Ether properly. The calling function does not handle the case where sendValue might revert due to the recipient's failure to accept the Ether.
Recommendation: Consider adding a try-catch mechanism or a more informative error message in the claimGas function to handle potential failures gracefully.
Code Reference: Address.sendValue(recipient, amount); in claimGas function.

Weak Sources of Randomness from Chain Attributes

Explanation: The contract relies on msg.sender for the claimGas function, which could be manipulated in a way that exploits the contract's logic if randomness is needed in the future.
Recommendation: If randomness is needed in the future, consider using a secure source of randomness such as Chainlink VRF.
Code Reference: claimGas function.

Gas Optimization in Allowance Logic

Explanation: The allowance function includes a gas optimization for specific addresses, returning type(uint256).max. This may lead to unexpected behavior if users are not aware that these specific addresses have unlimited allowances.
Recommendation: Ensure that these addresses are trustworthy and that they do not introduce vulnerabilities through unexpected behavior.
Code Reference: Allowance function.

🟢 Low

Non-standard Decimal Value

Explanation: The decimals function returns 15, which is non-standard for ERC-20 tokens (typically 18). This may lead to confusion or unexpected behavior in applications that assume the standard decimal value.
Recommendation: Consider using the standard decimal value of 18 for better compatibility with existing ERC-20 token standards.
Code Reference: function decimals() public view virtual override returns (uint8) { return 15; }.

Transfer Ownership to Zero Address

Explanation: The constructor transfers ownership to the zero address, meaning that the contract will have no owner after deployment. This could be a design choice but also means that no one can manage or upgrade the contract.
Recommendation: Reassess the decision to transfer ownership to the zero address to ensure it aligns with the intended functionality of the contract.
Code Reference: Constructor: _transferOwnership(address(0));.

✅ Conclusion

The BeeperCoin contract exhibits several vulnerabilities primarily related to access control, reentrancy, and transaction-ordering dependence. Addressing these issues is crucial to enhance the security of the contract and protect against potential exploits.

                                                                                                                                                                      
                                                                                                                                                                                     
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