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Advanced Manual
Smart Contract Audit

August 11, 2022

Audit requested by

Green Baby Floki

0x5f12cEFbd4C1312c728E83b14bec08c96EFD5C0a

Green Baby Floki / Security Audit

Table of Contents

1. Audit Summary

1.1 Audit scope

1.2 Tokenomics

1.3 Source Code

2. Disclaimer

3. Global Overview

3.1 Informational issues

3.2 Low-risk issues

3.3 Medium-risk issues

3.4 High-risk issues

4. Vulnerabilities Findings

5. Contract Privileges

5.1 Maximum Fee Limit Check

5.2 Contract Pausability Check

5.3 Max Transaction Amount Check

5.4 Exclude From Fees Check

5.5 Ability to Mint Check

5.6 Ability to Blacklist Check

5.7 Owner Privileges Check

6. Notes

6.1 Notes by Coinsult

6.2 Notes by Green Baby Floki

7. Contract Snapshot

8. Website Review

9. Certificate of Proof

Green Baby Floki / Security Audit

Audit Summary

Audit Scope

Project Name

Green Baby Floki

Blockchain

Binance Smart Chain

Smart Contract Language

Solidity

Contract Address

0x5f12cEFbd4C1312c728E83b14bec08c96EFD5C0a

Audit Method

Static Analysis, Manual Review

Date of Audit

11 August 2022

This audit report has been prepared by Coinsult’s experts at the request of the client. In this audit, the results of the static analysis and the manual code review will be presented. The purpose of the audit is to see if the functions work as intended, and to identify potential security issues within the smart contract.

The information in this report should be used to understand the risks associated with the smart contract. This report can be used as a guide for the development team on how the contract could possibly be improved by remediating the issues that were identified.

Green Baby Floki / Security Audit

Tokenomics

Rank Address Quantity (Token) Percentage
1 0xe823b0957d8897135750fd08485ee7524a035ec7 1,000,000,000,000 100.0000%

Source Code

Coinsult was comissioned by Green Baby Floki to perform an audit based on the following code:
https://bscscan.com/address/0x5f12cEFbd4C1312c728E83b14bec08c96EFD5C0a#code

Green Baby Floki / Security Audit

Disclaimer

This audit report has been prepared by Coinsult’s experts at the request of the client. In this audit, the results of the static analysis and the manual code review will be presented. The purpose of the audit is to see if the functions work as intended, and to identify potential security issues within the smart contract.

The information in this report should be used to understand the risks associated with the smart contract. This report can be used as a guide for the development team on how the contract could possibly be improved by remediating the issues that were identified.

Coinsult is not responsible if a project turns out to be a scam, rug-pull or honeypot. We only provide a detailed analysis for your own research.

Coinsult is not responsible for any financial losses. Nothing in this contract audit is financial advice, please do your own research.

The information provided in this audit is for informational purposes only and should not be considered investment advice. Coinsult does not endorse, recommend, support or suggest to invest in any project. 

Coinsult can not be held responsible for when a project turns out to be a rug-pull, honeypot or scam.

Green Baby Floki / Security Audit

Global Overview

Manual Code Review

In this audit report we will highlight the following issues:

Vulnerability Level

Total

Pending

Acknowledged

Resolved

0

0

0

0

5

0

0

0

0

0

0

0

0

0

0

0

Privilege Overview

Coinsult checked the following privileges:

Contract Privilege

Description

Owner can mint?

Owner can blacklist?

Owner can set fees > 25%?

Owner can exclude from fees?

Owner can pause trading?

Owner can set Max TX amount?

More owner priviliges are listed later in the report.

Green Baby Floki / Security Audit

Wrong require statement
				
					    function updateSellFees(uint256 _marketingFeeOnSell, uint256 _rewardFeeOnSell) external onlyOwner {
        require(
             _marketingFeeOnSell + _rewardFeeOnSell <= 25,
            "Fees must be less than 25%"
        );
        rewardFeeOnSell    = _rewardFeeOnSell;
        marketingFeeOnSell = _marketingFeeOnSell;
        _totalFeesOnSell   =  marketingFeeOnSell + rewardFeeOnSell;
        emit UpdateSellFees( _marketingFeeOnSell, _rewardFeeOnSell);
    }
				
			

Recommendation

Currently it’s not ‘less than 25’ but less or equal to 25.

Green Baby Floki / Security Audit

Avoid relying on block.timestamp

block.timestamp can be manipulated by miners.

				
					function canAutoClaim(uint256 lastClaimTime) private view returns (bool) {
    	if(lastClaimTime > block.timestamp)  {
    		return false;
    	}

    	return block.timestamp.sub(lastClaimTime) >= claimWait;
    }
				
			

Recommendation

Do not use block.timestampnow or blockhash as a source of randomness

Exploit scenario

				
					contract Game {

    uint reward_determining_number;

    function guessing() external{
      reward_determining_number = uint256(block.blockhash(10000)) % 10;
    }
}
				
			

Eve is a miner. Eve calls guessing and re-orders the block containing the transaction. As a result, Eve wins the game.

Green Baby Floki / Security Audit

Too many digits

Literals with many digits are difficult to read and review.

				
					function updateGasForProcessing(uint256 newValue) public onlyOwner {
        require(newValue >= 200000 && newValue <= 500000, "gasForProcessing must be between 200,000 and 500,000");
        require(newValue != gasForProcessing, "Cannot update gasForProcessing to same value");
        emit GasForProcessingUpdated(newValue, gasForProcessing);
        gasForProcessing = newValue;
    }
				
			

Recommendation

Exploit scenario

				
					contract MyContract{
    uint 1_ether = 10000000000000000000; 
}
				
			

While 1_ether looks like 1 ether, it is 10 ether. As a result, it’s likely to be used incorrectly.

Green Baby Floki / Security Audit

No zero address validation for some functions

Detect missing zero address validation.

				
					function changeOperatorWallet(address newAddress) external onlyOperator{
        require(newAddress != operator,"Operator Address is already same");
        operator = newAddress;
    }
				
			

Recommendation

Check that the new address is not zero.

Exploit scenario

				
					contract C {

  modifier onlyAdmin {
    if (msg.sender != owner) throw;
    _;
  }

  function updateOwner(address newOwner) onlyAdmin external {
    owner = newOwner;
  }
}
				
			

Bob calls updateOwner without specifying the newOwner, soBob loses ownership of the contract.

Green Baby Floki / Security Audit

Functions that send Ether to arbitrary destinations

Unprotected call to a function sending Ether to an arbitrary address.

				
					function sendBNB(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
				
			

Recommendation

Ensure that an arbitrary user cannot withdraw unauthorized funds.

Exploit scenario

				
					contract ArbitrarySend{
    address destination;
    function setDestination(){
        destination = msg.sender;
    }

    function withdraw() public{
        destination.transfer(this.balance);
    }
}
				
			

Bob calls setDestination and withdraw. As a result he withdraws the contract’s balance.

Green Baby Floki / Security Audit

Unchecked transfer

The return value of an external transfer/transferFrom call is not checked.

				
					function claimStuckTokens(address token) external onlyOwner {
        require(token != address(this), "Owner cannot claim native tokens");
        if (token == address(0x0)) {
            payable(msg.sender).transfer(address(this).balance);
            return;
        }
        IERC20 ERC20token = IERC20(token);
        uint256 balance = ERC20token.balanceOf(address(this));
        ERC20token.transfer(msg.sender, balance);
    }
				
			

Recommendation

Use SafeERC20, or ensure that the transfer/transferFrom return value is checked.

Exploit scenario

				
					contract Token {
    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success);
}
contract MyBank{  
    mapping(address => uint) balances;
    Token token;
    function deposit(uint amount) public{
        token.transferFrom(msg.sender, address(this), amount);
        balances[msg.sender] += amount;
    }
}
				
			

Several tokens do not revert in case of failure and return false. If one of these tokens is used in MyBankdeposit will not revert if the transfer fails, and an attacker can call deposit for free..

Green Baby Floki / Security Audit

Contract Privileges

Maximum Fee Limit Check

Coinsult tests if the owner of the smart contract can set the transfer, buy or sell fee to 25% or more. It is bad practice to set the fees to 25% or more, because owners can prevent healthy trading or even stop trading when the fees are set too high. 

Type of fee

Description

Transfer fee

Buy fee

Sell fee

Type of fee

Description

Max transfer fee

Max buy fee

Max sell fee

Green Baby Floki / Security Audit

Contract Pausability Check

Coinsult tests if the owner of the smart contract has the ability to pause the contract. If this is the case, users can no longer interact with the smart contract; users can no longer trade the token.

Privilege Check

Description

Can owner pause the contract?

Green Baby Floki / Security Audit

Max Transaction Amount Check

Coinsult tests if the owner of the smart contract can set the maximum amount of a transaction. If the transaction exceeds this limit, the transaction will revert. Owners could prevent normal transactions to take place if they abuse this function.

Privilege Check

Description

Can owner set max tx amount?

Green Baby Floki / Security Audit

Exclude From Fees Check

Coinsult tests if the owner of the smart contract can exclude addresses from paying tax fees. If the owner of the smart contract can exclude from fees, they could set high tax fees and exclude themselves from fees and benefit from 0% trading fees. However, some smart contracts require this function to exclude routers, dex, cex or other contracts / wallets from fees.

Privilege Check

Description

Can owner exclude from fees?

Green Baby Floki / Security Audit

Ability To Mint Check

Coinsult tests if the owner of the smart contract can mint new tokens. If the contract contains a mint function, we refer to the token’s total supply as non-fixed, allowing the token owner to “mint” more tokens whenever they want.

A mint function in the smart contract allows minting tokens at a later stage. A method to disable minting can also be added to stop the minting process irreversibly.

Minting tokens is done by sending a transaction that creates new tokens inside of the token smart contract. With the help of the smart contract function, an unlimited number of tokens can be created without spending additional energy or money.

Privilege Check

Description

Can owner mint?

Green Baby Floki / Security Audit

Ability To Blacklist Check

Coinsult tests if the owner of the smart contract can blacklist accounts from interacting with the smart contract. Blacklisting methods allow the contract owner to enter wallet addresses which are not allowed to interact with the smart contract. 

This method can be abused by token owners to prevent certain / all holders from trading the token. However, blacklists might be good for tokens that want to rule out certain addresses from interacting with a smart contract.

Privilege Check

Description

Can owner blacklist?

Green Baby Floki / Security Audit

Other Owner Privileges Check

Coinsult lists all important contract methods which the owner can interact with.

⚠ Owner is able to transfer without fees

⚠ Owner is able to exclude addresses from dividend

⚠ Owner can set max wallet balance (cannot be lower than 1% of the total supply)

⚠ Owner can set max transaction limit (cannot be lower than 0.1% of the total supply)

⚠ Owner can exclude addresses from the max transaction limit and max wallet balance.

⚠ Owner can update minimum holding balance to be eligible to dividend

Green Baby Floki / Security Audit

Notes

Notes by Green Baby Floki

No notes provided by the team.

Notes by Coinsult

✅ No notes provided by Coinsult

Green Baby Floki / Security Audit

Contract Snapshot

This is how the constructor of the contract looked at the time of auditing the smart contract.

				
					constructor() ERC20("Green Baby Floki", "GBF") 
    {
        address newOwner = 0xe823B0957d8897135750fd08485eE7524A035eC7;
        transferOwnership(newOwner);
        operator=msg.sender;
        _mint(owner(), 1_000_000_000_000 * (10 ** 18));
        swapTokensAtAmount = totalSupply() / 5000;

        maxTransactionAmountBuy    = totalSupply() / 20;
        maxTransactionAmountSell   = totalSupply() / 20;
        maxWalletAmount            = totalSupply() / 10;
				
			

Green Baby Floki / Security Audit

Website Review

Coinsult checks the website completely manually and looks for visual, technical and textual errors. We also look at the security, speed and accessibility of the website. In short, a complete check to see if the website meets the current standard of the web development industry. 

Type of check

Description

Mobile friendly?

Contains jQuery errors?

Is SSL secured?

Contains spelling errors?

Green Baby Floki / Security Audit

Certificate of Proof

Green Baby Floki

Completed KYC Verification at a Coinsult partner

Green Baby Floki

Audited by Coinsult.net

Date: 11 August 2022

Coinsult

coinsult.net

End of report
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