TempleGold

Summary

The provided AuctionBase.sol contract lacks input validation for critical functions, which can lead to various logical vulnerabilities. Specifically, the contract does not validate the epochId or other parameters when accessing or modifying epoch information, leading to potential unexpected behaviors and errors.

Vulnerability Details

The contract allows interaction with internal mappings without validating the input parameters, such as epochId. This means users can pass in invalid or out-of-bounds values, which could cause the contract to behave unexpectedly or enter an invalid state. For example a user could request information for an epochId that does not exist or set epochId to a negative value (if such a concept were possible in Solidity), potentially leading to incorrect behaviors or errors.

Impact

• Without validation, users can retrieve data for non-existent epochs, leading to incorrect data being returned.

• Setting invalid values could corrupt the contract’s state, causing errors in the logic and potentially making the contract unusable.

• In the absence of validation, it becomes easier for malicious actors to exploit these weaknesses, leading to potential vulnerabilities such as state manipulation or even denial of service.

Tools Used

Manual Review

Recommendations

• Implement validation checks on all input parameters, especially for critical functions. Ensure epochId and other important parameters are within expected ranges.

• Use require statements to enforce valid input ranges and handle errors gracefully.

  
  - Ensure that all input parameters are validated using require statements

  require(epochId > 0, "Epoch ID must be positive");

  
  - Verify that requested epochs and other data exist before accessing or modifying them.

  EpochInfo memory info = epochs[epochId];

  require(info.startTime != 0, "Epoch does not exist");

• Write extensive unit tests to cover various edge cases and ensure the contract handles invalid inputs correctly.

• Although Solidity 0.8+ has built-in overflow checks, always use safe mathematical operations to prevent underflow/overflow issues.

• Restrict access to state-modifying functions to ensure only authorized entities can change critical contract states by using ownable contract from open zepplin.

• Use guard clauses to prevent invalid state changes early in the function execution.

  function setEpochInfo(uint256 epochId, EpochInfo memory info) external onlyOwner {

  require(epochId > 0, "Invalid epoch ID");

  require(info.startTime > 0, "Invalid epoch start time");

  epochs[epochId] = info;

  }