简析Velocore黑客攻击事件:损失688万美元ETH,用户流动性全归零

Odaily星球日报Published on 2024-06-03Last updated on 2024-06-03

Abstract

团队表示会对受影响人提供补偿,并快照了攻击事件发生前的区块状态。

原文作者:Ting

原文来源:动区动趋 BlockTempo

昨日,去中心化交易平台 Velocore 遭到黑客攻击,被窃取 1807 枚 ETH(约 688 万美元),事后 Velocore 公布报告,说明受影响的资金池、攻击手法以及后续的补偿计划。

部署在 Layer 2 网路 zkSync 及 Linea 上的去中心化交易平台 Velocore 在昨(2)日遭到骇客攻击,损失达 1807 枚 ETH(约 688 万美元)

链上分析师余烬表示,该平台上所有用户的流动性资金都被盗取,骇客随后将窃取的资金通过跨链桥转移至以太坊主网,并且将 ETH 全部转移到 0x e 40 地址,并利用混币器协议 Tornado 将资金隐匿洗出。

另外,根据 DeFi 数据平台 DefiLlama 的数据显示,Velocore 遭到骇客攻击后,其总锁定价值从前一日的 1, 016 万美元暴跌至 83.5 万美元,下跌幅度高达 92% 。

简析Velocore黑客攻击事件:损失688万美元ETH,用户流动性全归零

合约漏洞导致

昨日,Velocore 团队针对本次骇客攻击事件发布了一份安全检讨报告。报告中指出,攻击的原因是 Balancer-style CPMM 池存在合约漏洞。报告详细列出了各个资金池的安全状况:

  • Linea 和 zkSync Era 链上的 Velocore 中所有 CPMM 池均受到影响。

  • 稳定池(stable pool)未受影响。

  • Telos 链上的 Velocore 也存在同样的问题,但团队已经在问题被利用前进行了处理。

  • Blast 链上的 Bladeswap 虽使用 Velocore 的核心合约,但由于 Bladeswap 采用的是 XYK 池而非 CPMM 池,故未受此次合约漏洞的影响。

    恒定乘积做市商 CPMM 是 DeFi 流动性矿池早期采用的函数之一,函式算法:x*y=k。其中 x 和 y 是池中资产的储存量,k 是一个不变的常数,该函式根据每个代币的可用数量 ( 流动性 ) 确定两种代币的价格范围,这代表著代币 X 的供应量增加,则代币 Y 的供应量减少以保持恒定值 k。

    又是闪电贷攻击?

    根据报告显示,攻击者先从混币器协议 Tornado 获取资金,并将合约漏洞触发条件满足,接者利用闪电贷款获取流动性提供者(LP)代币,并提取了大部分代币,使流动性池的规模大幅缩小。随后,攻击者利用代币合约漏洞铸造了异常大量的 LP 代币,从而偿还了闪电贷款。

    恢复运营才补偿用户

    针对本次黑客攻击,Velocore 团队表示正在积极追查骇客,同时也尝试和黑客进行链上协商,Velocore 在链上向和黑客沟通讯息显示:

    若黑客在 6 月 3 日下午 4 点钱归还剩余资金,团队愿意提供 10 % 的白帽骇客赏金

    不过目前黑客尚未对 Velocore 做出回应。

    另一方面,团队还表示会对受影响人提供补偿,并快照了攻击事件发生前的区块状态,只不过补偿计划需要等待 Velocore 恢复运营后才会著手执行。

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