potential arithmetic overflow in the code under review.

[code423n4]

Lines of code

https://github.com/code-423n4/2023-06-canto/blob/a4ff2fd2e67e77e36528fad99f9d88149a5e8532/Canto/x/coinswap/keeper/swap.go#L36

Vulnerability details

Summary

This report highlights a high vulnerability related to potential arithmetic overflow in the code under review.

Vulnerability Details

The code performs arithmetic operations, such as addition, subtraction, multiplication, and division, on sdk.Int values. However, it lacks proper validation to handle potential arithmetic overflow scenarios. If the calculations result in values that exceed the maximum range of sdk.Int, it can lead to an arithmetic overflow, causing unexpected behavior or crashes.

Impact

The vulnerability poses a significant risk to the overall system under test. If an arithmetic overflow occurs, it can result in incorrect calculations, data corruption, or even system crashes. Exploiting this vulnerability may allow attackers to manipulate calculations, bypass security measures, or cause disruptions in the system's functionality.

Proof of Concept

To demonstrate the potential vulnerability, consider the following scenario:

1. Assume a situation where the code performs multiplication or addition on large sdk.Int values.
2. If the result exceeds the maximum range of sdk.Int, an arithmetic overflow occurs.
3. The overflow can lead to incorrect calculations, unexpected behavior, or system crashes. Certainly! Here's an example proof of concept code snippet that demonstrates the potential arithmetic overflow vulnerability:

package main

import (
    "fmt"
    sdk "your-sdk-package" // Replace with the actual SDK package name
)

func main() {
    var a sdk.Int = sdk.NewInt(999999999999999999) // Large initial value
    var b sdk.Int = sdk.NewInt(2)

    // Perform multiplication
    result := a.Mul(b)

    fmt.Println(result)
}

In the above code, we initialize a with a large value and b with a small value. The code then performs a multiplication operation between a and b using the Mul function provided by the SDK package. Since a is initialized with a value close to the maximum range of sdk.Int, the multiplication result may exceed the maximum range of sdk.Int, causing an arithmetic overflow.

Executing this code may result in unexpected behavior, incorrect calculation results, or even a system crash due to the arithmetic overflow.

To mitigate this vulnerability, proper validation and error handling should be implemented to prevent arithmetic overflow scenarios and ensure the stability of the system.

Tools Used

The analysis and identification of this vulnerability were performed through manual code review and analysis.

Recommended Mitigation Steps

To mitigate the identified vulnerability, it is recommended to implement proper validation and error handling for potential arithmetic overflow scenarios. The following steps can be taken to address the issue:

1. Perform range checks and validation before executing arithmetic operations on sdk.Int values.
2. Utilize appropriate data types or libraries that support arbitrary-precision arithmetic, if required.
3. Implement error handling mechanisms to gracefully handle potential overflow situations, such as returning an error or terminating the operation.

By implementing these mitigation steps, the risk of arithmetic overflow can be significantly reduced, ensuring the integrity and stability of the system.

Assessed type

Under/Overflow

[c4-pre-sort]

JeffCX marked the issue as low quality report

[JeffCX]

Insufficient Proof, the POC is not in the context of the codebase

[c4-judge]

0xean marked the issue as unsatisfactory: Insufficient proof