Quarashi Vesting v.2 Security Audit Report

BSC_QuarashiVesting_v2_report.md

Quarashi Vesting v.2 Security Audit Report

1. Summary

Quarashi Vesting smart contract security audit report performed by Callisto Security Audit Department

• https://vesting.quarashi.network/

2. In scope

https://bscscan.com/address/0xe6394181e5fdfff83bebe76ef5898c22fa62c85d#code

3. Findings

In total, 0 issues were reported, including:

• 0 high severity issues.

• 0 medium severity issues.

• 0 low severity issues.

In total, 1 notes were reported, including:

• 1 notes.

• 0 owner privileges.

No critical security issues were found.

3.1. The event claimedTokenForUser use inaccurate value

Severity: note

Description

In the function transferTokens() of Vesting contract when tokens transferred emit the event claimedTokenForUser with processForInvestor[_investor][index].part (line 869) as amount. But in case of last part transfer this amount may be little bit bigger, because it transfer all the rest amount userSign.lockForUser (line 854).

Recommendation

Use additional variable amount like this:

    function transferTokens(address _investor, uint256 index) internal {
        Inv memory userSign = processForInvestor[_investor][index];
        uint256 amount;
        if (userSign.lockForUser / userSign.part == 1) {
            processForInvestor[_investor][index].lockForUser = 0;
            amount = userSign.lockForUser;
        } else {
            processForInvestor[_investor][index].lockForUser =
                userSign.lockForUser -
                userSign.part;
            amount = userSign.part;
        }
        require(
            erc20.transfer(_investor, amount),
            "Vesting: tokens didn`t transfered"
        );
        emit claimedTokenForUser(
            _investor,
            amount,
            block.timestamp,
            index
        );
    }

4. Security practices

• Open-source contact.
• The contract should pass a bug bounty after the completion of the security audit.
• Public testing.
• Multisig owner account.
• Standard ERC20-related issues. - NOT IMPLEMENTED. It is known that every contract can potentially receive an unintended ERC20-token deposit without the ability to reject it even if the contract is not intended to receive or hold tokens. As a result, it is recommended to implement a function that will allow extracting any arbitrary number of tokens from the contract.

5. Conclusion

The audited smart contract can be deployed. No security issues were found during the audit.

It is recommended to adhere to the security practices described in pt. 4 of this report to ensure the contract's operability and prevent any issues that are not directly related to the code of this smart contract.