DittoETH

Summary

The provided LibVault library contains several arithmetic operations. While Solidity 0.8 and later versions have built-in overflow and underflow checks, it's crucial to ensure that all arithmetic operations are safe and do not lead to unintended consequences.

Vulnerability Details

Unchecked Arithmetic Operations: The library uses unchecked arithmetic operations in multiple places. While Solidity 0.8 has built-in overflow and underflow checks, using unchecked operations bypasses these checks. This can lead to vulnerabilities if not handled correctly.

Potential for Division by Zero: In the updateYield function, there is a division operation yield.divU80(zethCollateral). If zethCollateral is zero, this will throw an error.

Impact

Unchecked Arithmetic: Bypassing the built-in overflow and underflow checks can lead to vulnerabilities where values wrap around, leading to unexpected behavior in the contract.

Division by Zero: If not handled, this can cause the contract to revert, potentially disrupting its normal operation.

Tools Used

Manual code review

Recommendations

Use Checked Arithmetic: Even though Solidity 0.8 has built-in checks, it's a good practice to be explicit about potential overflows and underflows. Consider using the SafeMath library or ensure that you're not bypassing Solidity's checks without a good reason.

Handle Division by Zero: Before performing a division, always check if the denominator is zero. If it is, handle the error gracefully, either by reverting with a clear error message or by providing a fallback mechanism.