CVE-2018-12025— FuturXE 安全漏洞

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The transferFrom function of a smart contract implementation for FuturXE (FXE), an Ethereum ERC20 token, allows attackers to accomplish an unauthorized transfer of digital assets because of a logic error. The developer messed up with the boolean judgment - if the input value is smaller than or equal to allowed value, the transfer session would stop execution by returning false. This makes no sense, because the transferFrom() function should require the transferring value to not exceed the allowed value in the first place. Suppose this function asks for the allowed value to be smaller than the input. Then, the attacker could easily ignore the allowance: after this condition, the `allowed[from][msg.sender] -= value;` would cause an underflow because the allowed part is smaller than the value. The attacker could transfer any amount of FuturXe tokens of any accounts to an appointed account (the `_to` address) because the allowed value is initialized to 0, and the attacker could bypass this restriction even without the victim's private key.

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FuturXE 安全漏洞

FuturXE（FXE）是一款基于以太坊的虚拟货币。 FXE的智能合约实现中的‘transferFrom’函数存在安全漏洞，该漏洞该源于程序存在逻辑错误。攻击者可利用该漏洞未授权转移数字资产。

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