慢雾：yearn 遭遇攻击的根本原因是 Yearn yETH 池合约存在不安全的数学运算
ChainCatcher 消息，据 SlowMist 监测，去中心化金融协议 yearn 遭遇黑客攻击，造成约 900 万美元损失。
慢雾安全团队对该事件进行了分析，确认根本原因如下：漏洞源于 Yearn yETH 加权稳定币交换池（Weighted Stableswap Pool）合约中用于计算供应量的 _calc_supply 函数逻辑。由于存在不安全的数学运算，该函数在计算过程中允许溢出和舍入误差，导致新供应量与虚拟余额的乘积计算出现显著偏差。攻击者利用此缺陷可将流动性操控至特定数值，并超额铸造流动性池（LP）代币，从而非法获利。建议加强边界场景测试，并采用经过安全验证的算术运算机制，以防范同类协议中此类溢出等高危漏洞。
此前消息，Yearn 发布声明称，其 yETH 稳定池于 11 月 30 日 21:11 UTC 遭遇攻击，攻击者通过自定义合约大量铸造 yETH，导致池内约 800 万美元资产受损，另有约 90 万美元损失来自 Curve 上的 yETH-WETH 池。
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