MuzzleToken
Smart Contract Audit Report
Audit Summary
MuzzleToken is a new ERC-20 token on Ethereum.
For this audit, we reviewed the project team's MuzzleToken contract at 0xef3dAa5fDa8Ad7aabFF4658f1F78061fd626B8f0 on the Ethereum Mainnet.
Audit Findings
Medium findings were identified and the team should resolve these issues.
Date: April 5th, 2023.Finding #1 - MuzzleToken - Medium
Description: The contract's Buy tax will never be charged on buys via Uniswap as theuniswapV2Pair
address is permanently set to the uniswapV2Factory contract.
Risk/Impact: The Buy tax is not charged on buys via Uniswap; instead, the contract's Sell fee is charged.function _transfer(address sender, address recipient, uint256 amount) internal virtual override nonReentrant { ... if (msg.sender == address(uniswapV2Pair)) { taxAmount = (amount * buyTax) / 10000; super._transfer(sender, development, (taxAmount * 3) / 4); super._transfer(sender, muzzleLock, (taxAmount * 1) / 4); }
Recommendation: If the team wishes to redeploy their contract, they should create a new Pair address in the constructor and setuniswapV2Pair
to the created address, or add a function that allows the owner to set the Pair address.
Resolution: The team has not yet addressed this issue.
Finding #2 - MuzzleToken - Low
Description: The contract contains the pause() and unpause() functions, but they are ineffective as the whenNotPaused() modifier is not utilized anywhere in the contract.
Risk/Impact: The team will not be able to pause/unpause any functionality in the contract as they may have intended.
Recommendation: The team should either utilize the whenNotPaused() modifier in a way that fits their intended functionality or remove the pause() and unpause() functions and Pausable contract to reduce contract size and deployment costs.
Resolution: The team has not yet addressed this issue.
Finding #3 - MuzzleToken - Informational
Description: Theunit
state variable is not used in the contract.
Recommendation: The above state variable should either be removed to reduce contract size and deployment costs or utilized in a way that fits the project team's intended functionality.
Finding #4 - MuzzleToken - Informational
Description: Thedevelopment
andmuzzleLock
state variables cannot be modified but are not declared constant.
Recommendation: The above state variables could be declared constant for additional gas savings on each reference.
Contract Overview
- The total supply of the token is set to 21 billion $MUZZ [21,000,000,000].
- No mint or burn functions are accessible, though the circulating supply can be decreased by sending tokens to the 0x..dead address.
- At the time of writing this report, there are 385 total token holders. The token allocation is as follows:
- 23.92% of the total supply belongs to the team's upgradeable Development address.
- 16.7% of the total supply belongs to the team's upgradeable Treasury address.
- 7.67% of the total supply belongs to the team's upgradeable Muzzle Lock address.
- 5% of the total supply belongs to the team's upgradeable Team address.
- 5% of the total supply belongs to the team's upgradeable Exchange address.
- 5% of the total supply belongs to the team's upgradeable Partnership address.
- 2.82% of the total supply is in Uniswap liquidity.
- Of that liquidity, 99% of the LP tokens belong to a token locking contract and will unlock on April 30th, 2025.
- The contract's Sell fee is charged on all transfers where the sender is neither the team's Muzzle Lock address nor the Development address.
- 80% of the tokens collected through the fee are sent to the Muzzle Lock address.
- The remaining 20% of the tokens collected through the fee are sent to the Development address.
- The owner can set the contract's Sell fee and Buy fee to any percentages up to 4% each at any time.
- The owner can withdraw any tokens or ETH from the contract at any time.
- As the contract is implemented with Solidity v0.8.x, it is protected from overflows/underflows.
- The contract complies with the ERC-20 token standard.
Audit Results
Vulnerability Category | Notes | Result |
---|---|---|
Arbitrary Jump/Storage Write | N/A | PASS |
Centralization of Control | N/A | PASS |
Compiler Issues | N/A | PASS |
Delegate Call to Untrusted Contract | N/A | PASS |
Dependence on Predictable Variables | N/A | PASS |
Ether/Token Theft | N/A | PASS |
Flash Loans | N/A | PASS |
Front Running | N/A | PASS |
Improper Events | N/A | PASS |
Improper Authorization Scheme | N/A | PASS |
Integer Over/Underflow | N/A | PASS |
Logical Issues |
|
WARNING |
Oracle Issues | N/A | PASS |
Outdated Compiler Version | N/A | PASS |
Race Conditions | N/A | PASS |
Reentrancy | N/A | PASS |
Signature Issues | N/A | PASS |
Sybil Attack | N/A | PASS |
Unbounded Loops | N/A | PASS |
Unused Code | N/A | PASS |
Overall Contract Safety | PASS |
Inheritance Chart
Function Graph
Functions Overview
($) = payable function
# = non-constant function
Int = Internal
Ext = External
Pub = Public
+ [Int] IUniswapV2Router01
- [Ext] factory
- [Ext] WETH
- [Ext] addLiquidity #
- [Ext] addLiquidityETH ($)
- [Ext] removeLiquidity #
- [Ext] removeLiquidityETH #
- [Ext] removeLiquidityWithPermit #
- [Ext] removeLiquidityETHWithPermit #
- [Ext] swapExactTokensForTokens #
- [Ext] swapTokensForExactTokens #
- [Ext] swapExactETHForTokens ($)
- [Ext] swapTokensForExactETH #
- [Ext] swapExactTokensForETH #
- [Ext] swapETHForExactTokens ($)
- [Ext] quote
- [Ext] getAmountOut
- [Ext] getAmountIn
- [Ext] getAmountsOut
- [Ext] getAmountsIn
+ [Int] IUniswapV2Router02 (IUniswapV2Router01)
- [Ext] removeLiquidityETHSupportingFeeOnTransferTokens #
- [Ext] removeLiquidityETHWithPermitSupportingFeeOnTransferTokens #
- [Ext] swapExactTokensForTokensSupportingFeeOnTransferTokens #
- [Ext] swapExactETHForTokensSupportingFeeOnTransferTokens ($)
- [Ext] swapExactTokensForETHSupportingFeeOnTransferTokens #
+ [Int] IUniswapV2Pair
- [Ext] name
- [Ext] symbol
- [Ext] decimals
- [Ext] totalSupply
- [Ext] balanceOf
- [Ext] allowance
- [Ext] approve #
- [Ext] transfer #
- [Ext] transferFrom #
- [Ext] DOMAIN_SEPARATOR
- [Ext] PERMIT_TYPEHASH
- [Ext] nonces
- [Ext] permit #
- [Ext] MINIMUM_LIQUIDITY
- [Ext] factory
- [Ext] token0
- [Ext] token1
- [Ext] getReserves
- [Ext] price0CumulativeLast
- [Ext] price1CumulativeLast
- [Ext] kLast
- [Ext] mint #
- [Ext] burn #
- [Ext] swap #
- [Ext] skim #
- [Ext] sync #
- [Ext] initialize #
+ Context
- [Int] _msgSender
- [Int] _msgData
+ Ownable (Context)
- [Pub] #
- [Pub] owner
- [Int] _checkOwner
- [Pub] renounceOwnership #
- modifiers: onlyOwner
- [Pub] transferOwnership #
- modifiers: onlyOwner
- [Int] _transferOwnership #
+ Pausable (Context)
- [Pub] #
- [Pub] paused
- [Int] _requireNotPaused
- [Int] _requirePaused
- [Int] _pause #
- modifiers: whenNotPaused
- [Int] _unpause #
- modifiers: whenPaused
+ [Int] IERC20
- [Ext] totalSupply
- [Ext] balanceOf
- [Ext] transfer #
- [Ext] allowance
- [Ext] approve #
- [Ext] transferFrom #
+ [Int] IERC20Metadata (IERC20)
- [Ext] name
- [Ext] symbol
- [Ext] decimals
+ ERC20 (Context, IERC20, IERC20Metadata)
- [Pub] #
- [Pub] name
- [Pub] symbol
- [Pub] decimals
- [Pub] totalSupply
- [Pub] balanceOf
- [Pub] transfer #
- [Pub] allowance
- [Pub] approve #
- [Pub] transferFrom #
- [Pub] increaseAllowance #
- [Pub] decreaseAllowance #
- [Int] _transfer #
- [Int] _mint #
- [Int] _burn #
- [Int] _approve #
- [Int] _spendAllowance #
- [Int] _beforeTokenTransfer #
- [Int] _afterTokenTransfer #
+ MuzzleToken (ERC20, Pausable, Ownable)
- [Pub] #
- modifiers: ERC20
- [Int] _transfer #
- modifiers: nonReentrant
- [Ext] setSellTax #
- modifiers: onlyOwner
- [Ext] setBuyTax #
- modifiers: onlyOwner
- [Ext] setOwner #
- modifiers: onlyOwner
- [Ext] pause #
- modifiers: onlyOwner
- [Ext] unpause #
- modifiers: onlyOwner
- [Ext] withdrawTokens #
- modifiers: onlyOwner
- [Ext] withdrawETH #
- modifiers: onlyOwner
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What is a SourceHat Audit?
Typically, a smart contract audit is a comprehensive review process designed to discover logical errors, security vulnerabilities, and optimization opportunities within code. A SourceHat Audit takes this a step further by verifying economic logic to ensure the stability of smart contracts and highlighting privileged functionality to create a report that is easy to understand for developers and community members alike.
How Do I Interpret the Findings?
Each of our Findings will be labeled with a Severity level. We always recommend the team resolve High, Medium, and Low severity findings prior to deploying the code to the mainnet. Here is a breakdown on what each Severity level means for the project:
- High severity indicates that the issue puts a large number of users' funds at risk and has a high probability of exploitation, or the smart contract contains serious logical issues which can prevent the code from operating as intended.
- Medium severity issues are those which place at least some users' funds at risk and has a medium to high probability of exploitation.
- Low severity issues have a relatively minor risk association; these issues have a low probability of occurring or may have a minimal impact.
- Informational issues pose no immediate risk, but inform the project team of opportunities for gas optimizations and following smart contract security best practices.