AuditReport.json

{
    "$schema": "http://json-schema.org/draft-07/schema#",
    "type": "object",
    "properties": {
        "contractName": "BadRNG",
        "auditDate": "2023-09-15",
        "auditors": ["ChatGPT Auditor", "Solidity Expert"],
        "codeExplanation": "The smart contract named 'BadRNG' is a raffle system where participants can enter by sending a certain amount of ether. A winner is then picked pseudo-randomly and awarded the accumulated funds. However, there are certain vulnerabilities associated with this contract.",
        "analysis": [
            {
                "issueType": "Source of Randomness",
                "severity": "Critical",
                "description": "The contract utilizes the combination of 'block.difficulty' and 'msg.sender' as a seed for the Keccak256 hash function to generate a pseudo-random number. This can be manipulated by miners and is not a safe source of randomness.",
                "affectedCode": "keccak256(abi.encodePacked(block.difficulty, msg.sender))",
                "codeExample": "uint256 randomWinnerIndex = uint256(keccak256(abi.encodePacked(block.difficulty, msg.sender)));",
                "recommendation": "Consider using Chainlink's VRF (Verifiable Random Function) or other off-chain solutions to obtain a truly random number."
            },
            {
                "issueType": "No Restrictions on pickWinner",
                "severity": "High",
                "description": "The 'pickWinner' function does not have any restrictions on who can call it, which means anyone can call this function and potentially manipulate the outcome.",
                "affectedCode": "function pickWinner() external",
                "codeExample": "function pickWinner() external {...}",
                "recommendation": "Restrict access to the 'pickWinner' function. For example, make it callable only by the contract owner or implement a specific time-based logic."
            }
        ]
    }
}