AvoCato Token

Unable to find manual contract audit (e.g. Certik, PeckShield, Solidity...)

AvoCato.swapBack() (#570-610) sends eth to arbitrary user
Dangerous calls:
- address(externalAddress).call{gas: 30000,value: amountBNBExternal}() (#597)
Ensure that an arbitrary user cannot withdraw unauthorized funds.

Additional information: link

Reentrancy in AvoCato._transferFrom(address,address,uint256) (#494-527):
External calls:
- swapBack() (#513)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToSwap,0,path,address(this),block.timestamp) (#580-586)
- distributor.deposit{value: amountBNBReflection.add(balanceBefore)}() (#596)
- address(externalAddress).call{gas: 30000,value: amountBNBExternal}() (#597)
- router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#600-607)
External calls sending eth:
- swapBack() (#513)
- distributor.deposit{value: amountBNBReflection.add(balanceBefore)}() (#596)
- address(externalAddress).call{gas: 30000,value: amountBNBExternal}() (#597)
- router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#600-607)
State variables written after the call(s):
- _balances[sender] = _balances[sender].sub(amount,Insufficient Balance) (#515)
- _balances[recipient] = _balances[recipient].add(amountReceived) (#518)
- amountReceived = takeFee(sender,amount) (#517)
- _balances[address(this)] = _balances[address(this)].add(feeAmount) (#556)
Apply the check-effects-interactions pattern.

Additional information: link

BTC_DISTRIBUTOR.distributeDividend(address) (#313-324) ignores return value by BTC.transfer(shareholder,amount) (#319)
AvoCato.recoverTokens(address,uint256) (#783-790) ignores return value by token.transfer(msg.sender,amountToRecover) (#789)
Use SafeERC20, or ensure that the transfer/transferFrom return value is checked.

Additional information: link

Contract ownership is not renounced (belongs to a wallet)

Combination 1: Reentrancy vulnerabilities + Functions that send Ether to arbitraty destination. Usual for scams. May be justified by some complex mechanics (e.g. rebase, reflections). DYOR & manual audit are advised.

Combination 2: Unchecked transfer + Functions that send Ether to arbitraty destination. Usual for scams. May be justified by some complex mechanics (e.g. rebase, reflections). DYOR & manual audit are advised.

Combination 3: Reentrancy vulnerabilities + Unchecked transfer vulnerability. Usual for scams. May be justified by some complex mechanics (e.g. rebase, reflections). DYOR & manual audit are advised.

AvoCato.swapBack() (#570-610) performs a multiplication on the result of a division:
-amountToLiquify = minTokensBeforeSwapThreshold.mul(liquidityFee / 2).div(totalBNBFee) (#571)
AvoCato.swapBack() (#570-610) performs a multiplication on the result of a division:
-amountBNBLiquidity = receivedBNB.mul(liquidityFee / 2).div(swapPercent) (#592)
Consider ordering multiplication before division.

Additional information: link

Reentrancy in BTC_DISTRIBUTOR.distributeDividend(address) (#313-324):
External calls:
- BTC.transfer(shareholder,amount) (#319)
State variables written after the call(s):
- shares[shareholder].totalRealised = shares[shareholder].totalRealised.add(amount) (#321)
- shares[shareholder].totalExcluded = getCumulativeDividends(shares[shareholder].amount) (#322)
Reentrancy in BTC_DISTRIBUTOR.process(uint256) (#282-306):
External calls:
- distributeDividend(shareholders[currentIndex]) (#298)
- BTC.transfer(shareholder,amount) (#319)
State variables written after the call(s):
- currentIndex ++ (#303)
Reentrancy in BTC_DISTRIBUTOR.setShare(address,uint256) (#246-260):
External calls:
- distributeDividend(shareholder) (#248)
- BTC.transfer(shareholder,amount) (#319)
State variables written after the call(s):
- shares[shareholder].amount = amount (#258)
- shares[shareholder].totalExcluded = getCumulativeDividends(shares[shareholder].amount) (#259)
Apply the check-effects-interactions pattern.

Additional information: link

AvoCato.swapBack() (#570-610) ignores return value by address(externalAddress).call{gas: 30000,value: amountBNBExternal}() (#597)
Ensure that the return value of a low-level call is checked or logged.

Additional information: link

AvoCato.unBlacklistMultipleWallets(address[]).i (#773) is a local variable never initialized
AvoCato.blacklistMultipleWallets(address[]).i (#753) is a local variable never initialized
Initialize all the variables. If a variable is meant to be initialized to zero, explicitly set it to zero to improve code readability.

Additional information: link

AvoCato.swapBack() (#570-610) ignores return value by router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#600-607)
Ensure that all the return values of the function calls are used.

Additional information: link

BTC_DISTRIBUTOR.setDistributionCriteria(uint256,uint256) (#241-244) should emit an event for:
- minPeriod = _minPeriod (#242)
- minDistribution = _minDistribution (#243)
AvoCato.setTransactionCooldownTime(uint256) (#616-618) should emit an event for:
- _transactionLockTime = transactiontime (#617)
AvoCato.setMaxTxLimit(uint256) (#623-625) should emit an event for:
- _maxTxAmount = amount.mul(10 ** _decimals) (#624)
AvoCato.setSwapBackSettings(bool,uint256) (#630-633) should emit an event for:
- minTokensBeforeSwapThreshold = _amount.mul(10 ** _decimals) (#632)
AvoCato.setLiquidityFees(uint256) (#665-668) should emit an event for:
- liquidityFee = _liquidityFee (#666)
- totalBNBFee = liquidityFee.add(reflectionFee).add(externalFee) (#667)
AvoCato.setRewardFees(uint256) (#673-676) should emit an event for:
- reflectionFee = _rewardFee (#674)
- totalBNBFee = liquidityFee.add(reflectionFee).add(externalFee) (#675)
AvoCato.setExternalFees(uint256) (#681-684) should emit an event for:
- externalFee = _externalFee (#682)
- totalBNBFee = liquidityFee.add(reflectionFee).add(externalFee) (#683)
AvoCato.setBurnFees(uint256) (#689-691) should emit an event for:
- burnFee = _burnFee (#690)
AvoCato.setBTCDistributorSettings(uint256) (#720-723) should emit an event for:
- distributorGas = gas (#722)
Emit an event for critical parameter changes.

Additional information: link

Auth.transferOwnership(address).adr (#123) lacks a zero-check on :
- owner = adr (#124)
AvoCato.setLiquidityAddress(address).wallet (#696) lacks a zero-check on :
- autoLiquidityReceiver = wallet (#697)
AvoCato.setExternalAddress(address).wallet (#703) lacks a zero-check on :
- externalAddress = wallet (#704)
AvoCato.recoverETH().recipient (#797) lacks a zero-check on :
- recipient.transfer(address(this).balance) (#799)
Check that the address is not zero.

Additional information: link

BTC_DISTRIBUTOR.distributeDividend(address) (#313-324) has external calls inside a loop: BTC.transfer(shareholder,amount) (#319)
AvoCato.setIsDividendExempt(address,bool) (#638-646) has external calls inside a loop: distributor.setShare(holder,0) (#642)
AvoCato.setIsDividendExempt(address,bool) (#638-646) has external calls inside a loop: distributor.setShare(holder,_balances[holder]) (#644)
Favor pull over push strategy for external calls.

Additional information: link

Reentrancy in AvoCato._transferFrom(address,address,uint256) (#494-527):
External calls:
- swapBack() (#513)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToSwap,0,path,address(this),block.timestamp) (#580-586)
- distributor.deposit{value: amountBNBReflection.add(balanceBefore)}() (#596)
- address(externalAddress).call{gas: 30000,value: amountBNBExternal}() (#597)
- router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#600-607)
External calls sending eth:
- swapBack() (#513)
- distributor.deposit{value: amountBNBReflection.add(balanceBefore)}() (#596)
- address(externalAddress).call{gas: 30000,value: amountBNBExternal}() (#597)
- router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#600-607)
State variables written after the call(s):
- amountReceived = takeFee(sender,amount) (#517)
- _totalSupply = _totalSupply.sub(burnAmount) (#560)
Reentrancy in AvoCato.constructor() (#412-445):
External calls:
- pair = IPancakeFactory(router.factory()).createPair(WBNB,address(this)) (#414)
State variables written after the call(s):
- _allowances[address(this)][address(router)] = ~ uint256(0) (#415)
- _balances[msg.sender] = _totalSupply (#443)
- autoLiquidityReceiver = msg.sender (#441)
- distributor = new BTC_DISTRIBUTOR(address(router)) (#417)
- isBTCDividendExempt[pair] = true (#421)
- isBTCDividendExempt[address(this)] = true (#422)
- isBTCDividendExempt[burnAddress] = true (#423)
- isBTCDividendExempt[zeroAddress] = true (#424)
- isExcludedFromAntiWhale[pair] = true (#432)
- isExcludedFromAntiWhale[msg.sender] = true (#433)
- isExcludedFromAntiWhale[burnAddress] = true (#434)
- isExcludedFromAntiWhale[zeroAddress] = true (#435)
- isExcludedFromAntiWhale[address(this)] = true (#436)
- isExcludedFromAntiWhale[externalAddress] = true (#437)
- isExcludedFromAntiWhale[address(router)] = true (#438)
- isExcludedFromTransactionlock[pair] = true (#426)
- isExcludedFromTransactionlock[msg.sender] = true (#427)
- isExcludedFromTransactionlock[address(this)] = true (#428)
- isExcludedFromTransactionlock[externalAddress] = true (#429)
- isExcludedFromTransactionlock[address(router)] = true (#430)
- isFeeExempt[msg.sender] = true (#419)
- isTxLimitExempt[msg.sender] = true (#420)
Reentrancy in BTC_DISTRIBUTOR.deposit() (#262-280):
External calls:
- router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: msg.value}(0,path,address(this),block.timestamp) (#269-274)
State variables written after the call(s):
- dividendsPerShare = dividendsPerShare.add(dividendsPerShareAccuracyFactor.mul(amount).div(totalShares)) (#279)
- totalDividends = totalDividends.add(amount) (#278)
Reentrancy in BTC_DISTRIBUTOR.distributeDividend(address) (#313-324):
External calls:
- BTC.transfer(shareholder,amount) (#319)
State variables written after the call(s):
- shareholderClaims[shareholder] = block.timestamp (#320)
Reentrancy in BTC_DISTRIBUTOR.setShare(address,uint256) (#246-260):
External calls:
- distributeDividend(shareholder) (#248)
- BTC.transfer(shareholder,amount) (#319)
State variables written after the call(s):
- addShareholder(shareholder) (#252)
- shareholderIndexes[shareholder] = shareholders.length (#346)
- removeShareholder(shareholder) (#254)
- shareholderIndexes[shareholders[shareholders.length - 1]] = shareholderIndexes[shareholder] (#352)
- addShareholder(shareholder) (#252)
- shareholders.push(shareholder) (#347)
- removeShareholder(shareholder) (#254)
- shareholders[shareholderIndexes[shareholder]] = shareholders[shareholders.length - 1] (#351)
- shareholders.pop() (#353)
- totalShares = totalShares.sub(shares[shareholder].amount).add(amount) (#257)
Apply the check-effects-interactions pattern.

Additional information: link

Reentrancy in AvoCato._transferFrom(address,address,uint256) (#494-527):
External calls:
- swapBack() (#513)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToSwap,0,path,address(this),block.timestamp) (#580-586)
- distributor.deposit{value: amountBNBReflection.add(balanceBefore)}() (#596)
- address(externalAddress).call{gas: 30000,value: amountBNBExternal}() (#597)
- router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#600-607)
- distributor.setShare(sender,_balances[sender]) (#520)
- distributor.setShare(recipient,_balances[recipient]) (#521)
- distributor.process(distributorGas) (#523)
External calls sending eth:
- swapBack() (#513)
- distributor.deposit{value: amountBNBReflection.add(balanceBefore)}() (#596)
- address(externalAddress).call{gas: 30000,value: amountBNBExternal}() (#597)
- router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#600-607)
Event emitted after the call(s):
- Transfer(sender,recipient,amountReceived) (#525)
Reentrancy in AvoCato._transferFrom(address,address,uint256) (#494-527):
External calls:
- swapBack() (#513)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToSwap,0,path,address(this),block.timestamp) (#580-586)
- distributor.deposit{value: amountBNBReflection.add(balanceBefore)}() (#596)
- address(externalAddress).call{gas: 30000,value: amountBNBExternal}() (#597)
- router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#600-607)
External calls sending eth:
- swapBack() (#513)
- distributor.deposit{value: amountBNBReflection.add(balanceBefore)}() (#596)
- address(externalAddress).call{gas: 30000,value: amountBNBExternal}() (#597)
- router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#600-607)
Event emitted after the call(s):
- Transfer(sender,address(this),feeAmount) (#557)
- amountReceived = takeFee(sender,amount) (#517)
- Transfer(sender,burnAddress,burnAmount) (#561)
- amountReceived = takeFee(sender,amount) (#517)
Reentrancy in AvoCato.constructor() (#412-445):
External calls:
- pair = IPancakeFactory(router.factory()).createPair(WBNB,address(this)) (#414)
Event emitted after the call(s):
- Transfer(address(0),msg.sender,_totalSupply) (#444)
Reentrancy in AvoCato.swapBack() (#570-610):
External calls:
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToSwap,0,path,address(this),block.timestamp) (#580-586)
- distributor.deposit{value: amountBNBReflection.add(balanceBefore)}() (#596)
- address(externalAddress).call{gas: 30000,value: amountBNBExternal}() (#597)
- router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#600-607)
External calls sending eth:
- distributor.deposit{value: amountBNBReflection.add(balanceBefore)}() (#596)
- address(externalAddress).call{gas: 30000,value: amountBNBExternal}() (#597)
- router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,autoLiquidityReceiver,block.timestamp) (#600-607)
Event emitted after the call(s):
- AutoLiquify(amountBNBLiquidity,amountToLiquify) (#608)
Apply the check-effects-interactions pattern.

Additional information: link

BTC_DISTRIBUTOR.shouldDistribute(address) (#308-311) uses timestamp for comparisons
Dangerous comparisons:
- shareholderClaims[shareholder] + minPeriod < block.timestamp && getUnpaidEarnings(shareholder) > minDistribution (#309-310)
AvoCato._transferFrom(address,address,uint256) (#494-527) uses timestamp for comparisons
Dangerous comparisons:
- require(bool,string)(isExcludedFromTransactionlock[sender] || block.timestamp >= _transactionCheckpoint[sender] + _transactionLockTime,Wait for transaction cooldown time to end before making a tansaction) (#503-504)
- require(bool,string)(isExcludedFromTransactionlock[recipient] || block.timestamp >= _transactionCheckpoint[recipient] + _transactionLockTime,Wait for transaction cooldown time to end before making a tansaction) (#505-506)
Avoid relying on block.timestamp.

Additional information: link

AvoCato._transferFrom(address,address,uint256) (#494-527) compares to a boolean constant:
-require(bool,string)(isBlacklisted[sender] == false,You are banned) (#498)
AvoCato._transferFrom(address,address,uint256) (#494-527) compares to a boolean constant:
-require(bool,string)(isBlacklisted[recipient] == false,The recipient is banned) (#499)
AvoCato.blacklistSingleWallet(address) (#742-746) compares to a boolean constant:
-isBlacklisted[account] == true (#743)
AvoCato.unBlacklistSingleWallet(address) (#762-766) compares to a boolean constant:
-isBlacklisted[account] == false (#763)
Remove the equality to the boolean constant.

Additional information: link

BTC_DISTRIBUTOR.process(uint256) (#282-306) has costly operations inside a loop:
- currentIndex = 0 (#294)
BTC_DISTRIBUTOR.distributeDividend(address) (#313-324) has costly operations inside a loop:
- totalDistributed = totalDistributed.add(amount) (#318)
BTC_DISTRIBUTOR.process(uint256) (#282-306) has costly operations inside a loop:
- currentIndex ++ (#303)
Use a local variable to hold the loop computation result.

Additional information: link

AvoCato.totalBNBFee (#391) is set pre-construction with a non-constant function or state variable:
- reflectionFee.add(externalFee).add(liquidityFee)
AvoCato._maxTxAmount (#403) is set pre-construction with a non-constant function or state variable:
- _totalSupply
AvoCato.minTokensBeforeSwapThreshold (#404) is set pre-construction with a non-constant function or state variable:
- _totalSupply / 20000
Remove any initialization of state variables via non-constant state variables or function calls. If variables must be set upon contract deployment, locate initialization in the constructor instead.

Additional information: link

Low level call in AvoCato.swapBack() (#570-610):
- address(externalAddress).call{gas: 30000,value: amountBNBExternal}() (#597)
Avoid low-level calls. Check the call success. If the call is meant for a contract, check for code existence

Additional information: link

Function IPANCAKERouter.WETH() (#138) is not in mixedCase
Contract BTC_DISTRIBUTOR (#191-355) is not in CapWords
Parameter BTC_DISTRIBUTOR.setDistributionCriteria(uint256,uint256)._minPeriod (#241) is not in mixedCase
Parameter BTC_DISTRIBUTOR.setDistributionCriteria(uint256,uint256)._minDistribution (#241) is not in mixedCase
Variable BTC_DISTRIBUTOR._token (#194) is not in mixedCase
Variable BTC_DISTRIBUTOR.BTC (#202) is not in mixedCase
Variable BTC_DISTRIBUTOR.WBNB (#203) is not in mixedCase
Parameter AvoCato.setSwapBackSettings(bool,uint256)._enabled (#630) is not in mixedCase
Parameter AvoCato.setSwapBackSettings(bool,uint256)._amount (#630) is not in mixedCase
Parameter AvoCato.setLiquidityFees(uint256)._liquidityFee (#665) is not in mixedCase
Parameter AvoCato.setRewardFees(uint256)._rewardFee (#673) is not in mixedCase
Parameter AvoCato.setExternalFees(uint256)._externalFee (#681) is not in mixedCase
Parameter AvoCato.setBurnFees(uint256)._burnFee (#689) is not in mixedCase
Parameter AvoCato.setBTCDistributionCriteria(uint256,uint256)._minPeriod (#712) is not in mixedCase
Parameter AvoCato.setBTCDistributionCriteria(uint256,uint256)._minDistribution (#712) is not in mixedCase
Variable AvoCato.BTC (#360) is not in mixedCase
Variable AvoCato.WBNB (#361) is not in mixedCase
Constant AvoCato._name (#367) is not in UPPER_CASE_WITH_UNDERSCORES
Constant AvoCato._symbol (#368) is not in UPPER_CASE_WITH_UNDERSCORES
Constant AvoCato._decimals (#369) is not in UPPER_CASE_WITH_UNDERSCORES
Variable AvoCato._totalSupply (#371) is not in mixedCase
Variable AvoCato._balances (#373) is not in mixedCase
Variable AvoCato._allowances (#374) is not in mixedCase
Variable AvoCato._maxTxAmount (#403) is not in mixedCase
Variable AvoCato._maxTokensPerAddress (#405) is not in mixedCase
Follow the Solidity naming convention.

Additional information: link

Variable IPANCAKERouter.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountADesired (#143) is too similar to IPANCAKERouter.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountBDesired (#144)
Prevent variables from having similar names.

Additional information: link

AvoCato.slitherConstructorVariables() (#357-802) uses literals with too many digits:
- zeroAddress = 0x0000000000000000000000000000000000000000 (#362)
AvoCato.slitherConstructorVariables() (#357-802) uses literals with too many digits:
- burnAddress = 0x000000000000000000000000000000000000dEaD (#363)
AvoCato.slitherConstructorVariables() (#357-802) uses literals with too many digits:
- _totalSupply = 100000000 * 10 ** 6 * (10 ** _decimals) (#371)
AvoCato.slitherConstructorVariables() (#357-802) uses literals with too many digits:
- distributorGas = 5000000 (#400)
AvoCato.slitherConstructorVariables() (#357-802) uses literals with too many digits:
- _maxTokensPerAddress = 2000000000 * 10 ** 8 * 10 ** _decimals (#405)
Use: Ether suffix, Time suffix, or The scientific notation

Additional information: link

AvoCato.BTC (#360) should be constant
AvoCato.WBNB (#361) should be constant
AvoCato._maxTokensPerAddress (#405) should be constant
AvoCato.burnAddress (#363) should be constant
AvoCato.feeDenominator (#392) should be constant
AvoCato.zeroAddress (#362) should be constant
BTC_DISTRIBUTOR.WBNB (#203) should be constant
BTC_DISTRIBUTOR.dividendsPerShareAccuracyFactor (#216) should be constant
Add the constant attributes to state variables that never change.

Additional information: link

authorize(address) should be declared external:
- Auth.authorize(address) (#95-97)
unauthorize(address) should be declared external:
- Auth.unauthorize(address) (#102-104)
transferOwnership(address) should be declared external:
- Auth.transferOwnership(address) (#123-127)
burn(address,uint256) should be declared external:
- AvoCato.burn(address,uint256) (#479-486)
setTransactionCooldownTime(uint256) should be declared external:
- AvoCato.setTransactionCooldownTime(uint256) (#616-618)
setIsExcludedFromAntiWhale(address,bool) should be declared external:
- AvoCato.setIsExcludedFromAntiWhale(address,bool) (#728-730)
setIsExcludedFromTransactionCooldown(address,bool) should be declared external:
- AvoCato.setIsExcludedFromTransactionCooldown(address,bool) (#735-737)
Use the external attribute for functions never called from the contract.

Additional information: link

Attempt to swap token was unsuccessful. For some reason it is untradeable. If token is not in presale stage and is not traded outside PancakeSwap, then it's a scam

Additional information: link

Average 30d PancakeSwap liquidity is less than $100. Token is either dead or inactive.

Average 30d PancakeSwap volume is less than $100. Token is either dead or inactive.

Average 30d number of PancakeSwap swaps is less than 1. Token is either dead or inactive.

Number of Binance Smart Chain (BSC) token holders is less than 100. Token is either dead or inactive. Ignore for presale.

Average PancakeSwap trading volume, liqudity, number of swaps are extremely low. Token seems to be dead.

Token is deployed only at one blockchain

Token has only one trading pair

Unable to find website, listings and other project-related information

Token is marked as scam (rug pull, honeypot, phishing, etc.)

Additional information: link

Token has a considerable age, but we're still unable to find its website

Token has no active CoinGecko listing / rank

Token has no active CoinMarketCap listing / rank

Token has a considerable age, but social accounts / website are missing or have few users

Token has a considerable age, but average PancakeSwap 30d trading volume is low

Young tokens have high risks of price dump / death