First Flight #2: Puppy Raffle

Summary

Vulnerability Details

The solidity version in use here which is 0.7.6 is totally outdated and subjected to various vulnerabilities including overflow etc..

Impact

This ca pose serious risk to the countract flow

Tools Used

Manual review

Recommendations

Use a solidity version of at least 0.8.0 to get overflow protection without SafeMath Use a solidity version of at least 0.8.2 to get compiler automatic inlining Use a solidity version of at least 0.8.3 to get better struct packing and cheaper multiple storage reads Use a solidity version of at least 0.8.4 to get custom errors, which are cheaper at deployment than revert()/require()