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Solidity

Solidity : Using approve function of the ERC-20 token standard

Overview

The approve function of ERC-20 is vulnerable. Using front-running attack one can spend approved tokens before change of allowance value.

References

  1. ERC20 API: An Attack Vector on Approve/TransferFrom Methods
  2. Ethereum: Approve
LOW

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See also

Solidity

Solidity : Return value of transfer, transferFrom, or approve function of ERC-20 standard is always false.

Solidity

Solidity : ERC-20 transfer should throw

Solidity

Solidity : Prefer external to public visibility level