This report has been prepared for KeplerSwap to discover issues and vulnerabilities in the source code of the KeplerSwap project as well as any contract dependencies that were not part of an officially recognized library. A comprehensive examination has been performed, utilizing Static Analysis and Manual Review techniques.

solc-0.7.2 is not recommended for deployment

Potential Reentrancy Issue

Reward update issue

Privileged ownership

`isContract` Is Not Safe

Missing Input Validation

Check Effect Interaction Pattern Violated

Centralized Control of  `voteWiners`

`reward` May Exceed Available Tokens 

Unused State Variable

State Variables That could be Declared Immutable

`getPairTokenPrice` May Be Attacked by `flash-loan`

Use `revert` Instead of `require`

Use `days` Instead Of Calculation

Missing Emit Events

Missing Check Function Caller

Privileged Ownership

`owner` Can withdraw Tokens From Contract

Unnecessary Check

Functions Should Be Declared External

`addXXXDestination` May Add Repeated `destination`

Tokens May Be Locked In Contract

Incorrect Calculation

Missing Invalid `_inviter` Check

Unlocked Compiler Version

Everyone Can Mint KeplerToken

Unused Function Parameter Can Be Removed

No Upper Limit Check For currentSnapshotId

Mismatch Between Code and Comment

`onlyOwnerOrSelf` Is No Need

`countUser` Should Be Ended At `countAt`?

`bestUser` Is Determined By The Order Of Winner

Non EOA Account May Retry To Win The Game

`addRewardToken` May Add Repeated Tokens

Potential Sandwich Attacks

Deposit Token Doesn't Match Withdraw Token

Unchecked Value of ERC-20 `transfer()`/`transferFrom()` Call

Use `days`  Directly

Writing Error(shares)

Use `RATIO` As Before

`_beforeDepositOrWithdraw` Never Be Called

`_inviter`'s Info Should Be Updated

Weak PRNG

No Restrict To Repeat Calling `registe`

KeplerSwap

FeeDispatcher.sol

farm

KeplerToken.sol

LuckyPool.sol

Crycle.sol

Lens.sol

lens

Inviter.sol

User.sol

MasterChef.sol

user

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Code Audit History

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38