PeckShield: Uniswap was hacked and lost 1278 ETH
2020-04-18 11:58
星球日报讯 今天下午,Tokenlon发消息称Uniswap上的imBTC池遭到黑客攻击并已耗尽。PeckShield安全人员跟进研究发现,Uniswap在此次攻击中损失了1278个ETH,价值约22万美元,此外还有大约18.37个imBTC被0x3195c3和0x17559a开头的两个套利者以较低的价格获取。
此次事件具体攻击方式为:黑客利用Uniswap和ERC777的兼容性问题,在进行ETH-imBTC交易时,利用ERC777中的多次迭代调用tokensToSend来实现重入攻击。这次攻击损失仅限于Uniswap上的ETH-imBTC 流动池,其他DeFi协议及BTC托管均未受影响。PeckShield 认为,自从年初的bZx攻击事件开始,这又是一起黑客利用DeFi系统性风控漏洞实施的攻击。目前Tokenlon已全面恢复imBTC合约转账及交易功能,不过在此期间建议用户先暂停使用Uniswap的ETH-imBTC流动池。
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