First Flight #2: Puppy Raffle

Vulnerability Details

The raffleDuration variable is used to determine the duration of each raffle. This variable is set in the constructor and can be any uint256 value, including 0 or the maximum value for a uint256 (approximately ( 1.15 \times 10^{77} ) seconds or 3.7 billion billion billion years). The lack of restrictions on the range of raffleDuration can lead to unintended behavior.

Impact

The unrestricted range of raffleDuration can cause several issues:

1. Zero Duration: If raffleDuration is set to 0, the raffle could end immediately after starting, potentially causing confusion or manipulation opportunities.

2. Excessively Long Duration: Setting raffleDuration to an extremely high value could effectively lock the raffle for an impractical period, rendering the contract unusable for its intended purpose.

3. Contract Usability and Fairness: The ability to set any duration, including extremely short or long periods, can affect the usability and fairness of the raffle process, impacting participant confidence and engagement.

Recommendations

• Implement Range Checks: Introduce validation in the constructor to ensure that raffleDuration falls within a reasonable and practical range. For instance, you might enforce a minimum duration of 1 minute and a maximum of 1 year.

• Document Reasonable Ranges: Clearly document the recommended and supported ranges for raffleDuration to guide contract deployers in choosing appropriate values.