Smart Contract Audit Report
SHIBONE INU is a new ERC-20 token on Ethereum that is an automatic liquidity providing protocol that pays static rewards to holders.
For this audit, we reviewed the project team's ShiboneInu contract at 0xd5de579f8324e3625bdc5e8c6f3db248614a41c5 on the Ethereum Mainnet.
Low findings were identified and the team should consider resolving these issues. In addition, some centralized aspects are present.
Date: February 27th, 2023.
Updated: February 27th, 2023 after the project team excluded the Pair address from rewards.
Finding #1 - ShiboneInu - High (Resolved)Description: The
uniswapV2Pairaddress is not excluded from the contract's rewards mechanism.
uniswapV2Pairaddress will earn static rewards via the contract's rewards mechanism causing extra tokens to be unaccounted for in the liquidity pool making it susceptible to a theft-of-liquidity attack.
Recommendation: The team should exclude the
uniswapV2Pairaddress (and all subsequently created pair addresses) from rewards using the excludeFromReward() function.
Resolution: The team has excluded the
uniswapV2Pairaddress from rewards.
Finding #2 - ShiboneInu - LowDescription: The owner can use the lock() function to temporarily set ownership to address(0). Ownership is restored after the duration of time determined by the owner has passed and the unlock() function can be used.
Risk/Impact: The unlock() function can be used after ownership has been set to address(0), which will restore ownership to the original owner that initially created the ownership lock. This can be used in a nefarious way by the project team to restore ownership and change fee percentages.
Recommendation: We recommend the team modify the unlock() function to set
_previousOwnerto address(0) at the end of the function or remove the lock functionality from the contract altogether.
Resolution: The team has not yet addressed this issue.
Finding #3 - ShiboneInu - InformationalDescription: Although the SafeMath library is utilized, the contract is deployed with Solidity v0.8.10 which has built-in overflow/underflow checks.
Recommendation: SafeMath could be safely removed to reduce contract size, deployment costs, and gas costs on all transactions that utilize it.
- The total supply of the token is set to 1 quadrillion $SHIBONE [1,000,000,000,000,000].
- No public mint or burn functions are present, though the circulating supply can be decreased by sending tokens to the 0x..dead address.
- There was no token allocation for our team to analyze as the contract has yet to be deployed to the mainnet.
- At the time of writing this report, 100% of the total supply belongs to the owner.
- Blacklisted accounts are prohibited from initiating transfers.
- The contract enforces a maximum transaction amount (determined by the owner) which imposes a limit to the number of tokens that can be transferred in a single transaction.
- The contract enforces a maximum wallet amount that prevents a transfer from occurring if the recipient's token balance will exceed the limit number of tokens (determined by the owner) after the transfer occurs.
- There is a Tax fee and a Liquidity fee on all buys and sells via Uniswap where neither the sender nor the recipient is excluded from fees. A separate fee structure can be set by the team to apply different fee percentages depending on whether the transfer is a buy or sell.
- The tokens collected through the Tax fee are removed from the circulating supply; This serves as a frictionless fee redistribution that automatically benefits all token holders at the time of each transaction.
- The team must ensure that all Pair addresses are excluded from rewards to prevent theft-of-liquidity attacks.
- The tokens collected through the Liquidity fee are stored in the contract address. The tokens are swapped for ETH for the purpose of funding Uniswap liquidity and team wallets when the following conditions are met:
- The automatic liquidity add functionality is enabled by the team.
- The threshold number of tokens (determined by the owner) in the contract address has been reached.
- The contract is not currently performing an automatic liquidity add.
- The caller is not initiating a buy transaction via Uniswap.
- Liquidity-adds are automatically performed by selling the tokens collected as fees, pairing the received ETH with the token, and adding it as liquidity to the ETH pair.
- The LP tokens received through this process are sent to the owner. We recommend that the team locked these newly acquired LP tokens.
- As the contract is deployed with Solidity v0.8.10, it is protected from overflows/underflows.
- The contract complies with the ERC-20 token standard.
- The owner can set the Tax fee and Liquidity fee for both fee structures to any percentages at any time.
- The owner can add/remove addresses from the transfer blacklist at any time.
- The owner can exclude and include accounts from transfer fees and reward distribution.
- The owner can update the maximum transaction amount and maximum wallet amount to any values at any time.
- The owner can exclude accounts from the maximum transaction and maximum wallet restrictions at any time.
- The owner can enable/disable the automatic liquidity add functionality at any time.
- The owner can update the threshold number of tokens needed to trigger an automatic liquidity add to any value at any time.
- The owner can withdraw any tokens or ETH from the contract at any time.
|Arbitrary Jump/Storage Write||N/A||PASS|
|Centralization of Control||
|Delegate Call to Untrusted Contract||N/A||PASS|
|Dependence on Predictable Variables||N/A||PASS|
The automatic token swapping functionality may be susceptible to front running. The team should monitor, and if any suspicious activity is detected, should either lower the
|Improper Authorization Scheme||N/A||PASS|
|Outdated Compiler Version||N/A||PASS|
|Overall Contract Safety||PASS|
($) = payable function # = non-constant function Int = Internal Ext = External Pub = Public + [Int] IERC20 - [Ext] totalSupply - [Ext] balanceOf - [Ext] transfer # - [Ext] allowance - [Ext] approve # - [Ext] transferFrom # + [Lib] SafeMath - [Int] add - [Int] sub - [Int] sub - [Int] mul - [Int] div - [Int] div - [Int] mod - [Int] mod + Context - [Int] _msgSender - [Int] _msgData + [Lib] Address - [Int] isContract - [Int] sendValue # - [Int] functionCall # - [Int] functionCall # - [Int] functionCallWithValue # - [Int] functionCallWithValue # - [Prv] _functionCallWithValue # + Ownable (Context) - [Pub]
# - [Pub] owner - [Pub] renounceOwnership # - modifiers: onlyOwner - [Pub] transferOwnership # - modifiers: onlyOwner - [Pub] geUnlockTime - [Pub] lock # - modifiers: onlyOwner - [Pub] unlock # + TokenRecover (Ownable) - [Pub] recoverERC20 # - modifiers: onlyOwner - [Pub] recoverETH # - modifiers: onlyOwner + [Int] IUniswapV2Factory - [Ext] feeTo - [Ext] feeToSetter - [Ext] getPair - [Ext] allPairs - [Ext] allPairsLength - [Ext] createPair # - [Ext] setFeeTo # - [Ext] setFeeToSetter # + [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 # + [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 # + ShiboneInu (Context, IERC20, Ownable, TokenRecover) - [Pub] # - [Pub] name - [Pub] symbol - [Pub] decimals - [Pub] totalSupply - [Pub] balanceOf - [Pub] transfer # - [Pub] allowance - [Pub] approve # - [Pub] transferFrom # - [Pub] increaseAllowance # - [Pub] decreaseAllowance # - [Pub] isExcludedFromReward - [Pub] totalFees - [Pub] deliver # - [Pub] reflectionFromToken - [Pub] tokenFromReflection - [Ext] addWalletToList # - modifiers: onlyOwner - [Pub] isWalletOnTheList - [Ext] removeWalletFromList # - modifiers: onlyOwner - [Pub] excludeFromReward # - modifiers: onlyOwner - [Ext] includeInReward # - modifiers: onlyOwner - [Pub] excludeFromFee # - modifiers: onlyOwner - [Pub] includeInFee # - modifiers: onlyOwner - [Pub] excludeFromLimit # - modifiers: onlyOwner - [Pub] includeInLimit # - modifiers: onlyOwner - [Ext] setSellFee # - modifiers: onlyOwner - [Ext] setBuyFee # - modifiers: onlyOwner - [Ext] setNumTokensSellToAddToLiquidity # - modifiers: onlyOwner - [Ext] setMaxTxPercent # - modifiers: onlyOwner - [Ext] _setMaxWalletSizePercent # - modifiers: onlyOwner - [Pub] setSwapAndLiquifyEnabled # - modifiers: onlyOwner - [Ext] ($) - [Prv] _reflectFee # - [Prv] _getTValues - [Prv] _getRValues - [Prv] _getRate - [Prv] _getCurrentSupply - [Prv] _takeLiquidity # - [Prv] calculateTaxFee - [Prv] calculateLiquidityFee - [Prv] removeAllFee # - [Prv] setBuy # - [Prv] setSell # - [Pub] isExcludedFromFee - [Pub] isExcludedFromLimit - [Prv] _approve # - [Prv] _transfer # - [Prv] swapAndLiquify # - modifiers: lockTheSwap - [Prv] swapTokensForEth # - [Prv] addLiquidity # - [Prv] _tokenTransfer # - [Prv] _transferStandard # - [Prv] _transferToExcluded # - [Prv] _transferFromExcluded # - [Prv] _transferBothExcluded #
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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.