First Flight #8: Math Master
First Flight #8
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Submission Details
Severity: low
Invalid

Contracts lacks proper boundary checks for its input parameters, leaving the vulnerable to unexpected behaviors if inputs fall outside reasonable limits

0xVinylDavyl

Summary

The MathMasters library lacks proper boundary checks for its input parameters, leaving the code vulnerable to unexpected behaviors if inputs fall outside reasonable limits.

Vulnerability Details

The absence of boundary checks in various functions, especially those dealing with mathematical operations, poses a risk of unexpected results or vulnerabilities if input values exceed acceptable limits. Failure to enforce these boundaries might lead to arithmetic overflows, underflows, or other undesired behaviors.

POC

/// @dev Equivalent to `(x * y) / WAD` rounded down.
function mulWad(uint256 x, uint256 y) internal pure returns (uint256 z) {
// @solidity memory-safe-assembly
assembly {
// Equivalent to `require(y == 0 || x <= type(uint256).max / y)`.
if mul(y, gt(x, div(not(0), y))) {
mstore(0x40, 0xbac65e5b) // `MathMasters__MulWadFailed()`.
revert(0x1c, 0x04)
}
z := div(mul(x, y), WAD)
}
}

Impact

The impact of lacking boundary checks can manifest in various ways, including arithmetic overflow or underflow, invalid calculations, and unexpected results. Without proper enforcement of input limits, the code may behave unpredictably, potentially compromising the integrity of mathematical operations and overall system functionality.

Tools Used

Manual code review and analysis conducted.

Recommendations

It is strongly recommended to implement boundary checks in relevant functions to ensure that input parameters remain within acceptable limits. These checks should be designed to prevent arithmetic overflow, underflow, or any other undesired behaviors caused by input values beyond the intended range.

Incorporate boundary checks for input parameters:

/// @dev Equivalent to `(x * y) / WAD` rounded down.
function mulWad(uint256 x, uint256 y) internal pure returns (uint256 z) {
require(y == 0 || x <= type(uint256).max / y, "MathMasters__MulWadFailed");
z := div(mul(x, y), WAD);
}
Updates

Lead Judging Commences

inallhonesty Lead Judge over 1 year ago
Submission Judgement Published
Invalidated
Reason: Incorrect statement

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