Core Contracts

Summary

The RAACNFT contract contains state variables and functions related to batch minting functionality that are not implemented. This creates a discrepancy between the contract's implied functionality, documentation, and actual implementation. The presence of unused code leads to unnecessary gas consumption and potential confusion for integrators.

Vulnerability Details

• Unused State Variable and Functionality:

  • The contract defines a currentBatchSize state variable initialized to 3 and includes the addNewBatch(uint256 _batchSize) function to modify it.

  • There is no implementation for actual batch minting, despite documentation implying its availability.

• Documentation and Interface Inconsistency:

  • The official documentation suggests that batch minting is supported.

  • The contract’s observable interface, however, only implements single-token minting through the mint(uint256 _tokenId, uint256 _amount) function.

• Potential Gas Waste and Confusion:

  • Maintaining unused state variables leads to unnecessary gas consumption over the contract's lifetime.

  • The discrepancy may result in integrators building systems based on incorrect assumptions about NFT batch processing capabilities.

• Error Handling and Limits:

  • While functions like addNewBatch include minimal input validation (rejecting zero values), there is no guard against potential unbounded increases.

  • The contract lacks formal definitions and events related to batch operations, further obfuscating intended functionality.

Impact

• Unnecessary state variables and functions complicate the codebase, increasing maintenance overhead and the potential for future errors.

• Operational Efficiency:

  • Users are forced to mint NFTs one at a time, leading to higher cumulative gas costs when minting multiple tokens.

• Integration Risks:

  • Third-party systems and integrators may rely on the documentation to support batch operations, resulting in failed integrations or unexpected behavior.

Tools Used

Manual review

Recommendations

1. Short-Term Remediation:

   • Remove Unused Code:
     Remove the currentBatchSize variable and addNewBatch function if batch minting is not intended to be supported.

   • Documentation Update:
     Update the documentation to accurately reflect the contract's functionality, clarifying that batch minting is not currently implemented.

2. Long-Term Remediation:

   • Implement Batch Minting Functionality:
     If batch minting is a desired feature, implement a robust batchMint(uint256[] calldata tokenIds, uint256 totalAmount) function that:

     • Validates the number of token IDs against a defined batch size (with maximum limits).

     • Computes the total price for the entire batch and validates the provided payment.

     • Executes minting of multiple NFTs in a single transaction and processes any necessary refund.