Summary

The nonReentrant modifier is typically provided by libraries, such as OpenZeppelin's ReentrancyGuard, to prevent re-entrancy attacks.

Vulnerability Details

The nonReentrant modifier is not defined within the contract. This modifier is crucial for preventing re-entrancy attacks, where an external contract can call back into the calling contract before the first call is finished, potentially leading to unexpected behavior or security vulnerabilities.

The contract likely intended to use the nonReentrant modifier from the OpenZeppelin ReentrancyGuard library but did not import this library.

Impact

As a result, the compiler does not recognize the modifier, leading to compilation errors.

Tools Used

Manual Review

Recommendations

To resolve this issue, the contract must import the OpenZeppelin ReentrancyGuard library, which provides the nonReentrant modifier. This is done by adding an import statement at the beginning of the contract file, specifying the path to the ReentrancyGuard.sol file from the OpenZeppelin contracts library.