First Flight #2: Puppy Raffle

Vulnerability Details

The PuppyRaffle contract's constructor allows the entranceFee to be set without any bounds. This means the entranceFee can be set to any value, including 0 or its maximum possible value (type(uint256).max). Such unrestricted setting can lead to operational issues or be exploited for malicious purposes.

Impact

• Operational Issues: Setting the entranceFee to 0 could lead to spamming of the raffle with non-serious participants and allows for DoS attack by getting the players arrays very big. Conversely, setting it too high could deter participation altogether.

• Potential for Abuse: An excessively high or low entranceFee could be used to manipulate the raffle or create unfavorable conditions for participants.

Recommendations

• Implement Bounds Checking: Enforce logical bounds for the entranceFee in the constructor. For example, set a minimum and maximum allowable fee that makes sense in the context of the raffle.

• Administrative Controls: Allow the owner or administrator of the contract to adjust the entranceFee within specified limits, post-deployment, to adapt to changing conditions or correct initial settings.