#8 邦尼事件：重复小额提款导致舍入误差累积，造成840万美元损失

2025年9月2日，Bunni V2协议遭受了一次复杂的攻击 [1]。攻击者利用其流动性核算机制中的一个关键漏洞，从以太坊上的USDC/USDT流动性池 [2] 和 Unichain 上的weETH/ETH流动性池 [3] 中提取了约840万美元。

根本原因是协议在移除流动性时更新闲置池余额存在舍入错误。该错误导致合约中总流动性被严重低估，从而产生了理论流动性和实际流动性之间可被利用的差异。攻击者随后执行了精确的夹击攻击，以从这种价差中获利。

此次事件直接导致Bunni协议遭受了严重的财务损失，该协议随后于2025年10月23日宣布破产 [4]。

背景

Bunni V2是一个建立在Uniswap V4之上的自动化做市商（AMM）协议。它通过钩子机制实现核心逻辑，并在Uniswap V3的集中流动性算法基础上进行创新，旨在为流动性提供者（LPs）提供更高的资本效率 [5]。

具体而言，该协议主要通过再抵押功能和再平衡机制来提升LP的回报。前者将流动性分配给外部的收益生成协议，保障了基础流动性，同时捕获额外的外部收益。后者则持续优化流动性在价格区间内的分布，增加了资本的活跃利用率，以提高交易费用收入。这两种机制是协议在基础集中流动性模型上的核心创新。

再抵押

为了提高流动性提供者的回报，Bunni V2采用再抵押策略。该策略将资金分配到不同的头寸：

• rawBalance（原始余额）：代币池储备的一部分直接存储在Uniswap V4的contract PoolManager中。这作为促进交易的即时可用流动性。
• reserves（储备）：剩余部分存入指定的ERC4626金库。这使得用户可以在这些资产上赚取额外的外部收益。

因此，池的总资产定义为：池资产 = rawBalance + reserves 的基础金额。

再平衡

为了增加交易费用收入，Bunni V2实施了再平衡机制，该机制会监控时间加权平均价格。当价格变化超过阈值时，流动性将根据流动性分布函数（LDF）重新分配到不同的价格区间。

这种重新分配可能会改变LDF所需的代币比例，导致一种代币的盈余。这种盈余被定义为闲置余额。

因此，流动性分为两部分：

• Active Balance（活跃余额）：LDF分配的、参与流动性计算的部分。
• Idle Balance（闲置余额）：未用于活跃流动性的盈余。

因此，池资产 = 活跃余额 + 闲置余额。

关键函数：流动性计算和移除

此次攻击利用了两个关键函数：queryLDF() 和 withdraw()。queryLDF() 函数用于计算交易的池流动性，而withdraw() 函数允许用户按比例移除流动性。

`queryLDF()` 函数

由于再抵押策略，基础资产的数量是动态的，Bunni V2不存储固定的“总流动性”值。相反，协议提供了queryLDF()函数，以便在发生交易时检索实时流动性 [6]。此函数的执行过程包含以下四个步骤：

1. 查询流动性密度：

   1. 调用流动性密度函数ldf.query()，获取当前价格区间外的流动性密度。
   2. 调用LiquidityAmounts.getAmountsForLiquidity()，获取当前价格区间内的密度。
   3. 计算两种代币在两个方向上的总流动性密度，分别表示为totalDensity0和totalDensity1。 值得注意的是，LiquidityAmounts.getAmountsForLiquidity()函数采用向上舍入（ceiling rounding）的方式，以确保计算出的代币数量不会小于理论值。
   

2. 计算可用余额 用于流动性计算的可用余额分别表示为balance0和balance1。闲置余额从对应代币的总余额中扣除，不包括不参与流动性计算的资金。 在此次攻击中，池的闲置资金由token0组成，计算公式如下：

   • $balance0=rawBalance0+reserve0-idleBalancebalance0\; =\; rawBalance0\; +\; reserve0\; -\; idleBalance$
   • $balance1=rawBalance1+reserve1balance1\; =\; rawBalance1\; +\; reserve1$

3. 估算有效流动性

   1. 根据实际可用余额（balance0或balance1）和计算出的总密度（totalDensity0或totalDensity1）估算每种代币可支持的流动性。
   2. 选择两者中较小的值作为最终的有效总流动性。 公式如下：

   $$L=min(\frac{balance0}{totalDensity0},\frac{balance1}{totalDensity1})L=\; min(\backslash frac\{balance0\}\{totalDensity0\},\backslash frac\{balance1\}\{totalDensity1\})$$

4. 计算活跃余额

   根据确定的总流动性，协议计算出用于交易的实际代币数量。这被定义为活跃余额。

`withdraw()` 函数

Bunni V2提供withdraw()函数用于移除流动性。用户移除的流动性与其在池总资金中的份额成正比。协议按相同比例更新rawBalance、reserves和idleBalance。调整公式如下：

$$(rawBalance,reserves,idleBalance)=(rawBalance,reserves,idleBalance)\times (1-\frac{shares}{totalSupply})(rawBalance,\; reserves,\; idleBalance)\; \backslash \backslash =\; (rawBalance,\; reserves,\; idleBalance)\; \backslash times\; (1-\backslash frac\{shares\}\{totalSupply\})$$

其中：

• shares 是用户移除的流动性份额数量；
• totalSupply 是该池的总流动性代币供应量。

漏洞分析

漏洞源于withdraw()函数在计算闲置余额的调整金额时使用了向下舍入（floor rounding）。这导致了闲置余额的估算过高。

回想一下可用余额公式**$balance=rawBalance+reserve-idlebalancebalance\; =\; rawBalance\; +\; reserve\; -\; idle\; balance$**。估算过高的闲置余额直接导致用于流动性计算的可用余额（balance0）被低估。因此，估算出的有效总流动性也被低估。根据Bunni的事故复盘报告 [7]，这种在流动性计算中的舍入方向是故意采用的。较低的计算流动性值会导致交易时价格影响更大。

这种设计依赖于一个关键假设：两种代币之间的余额比例保持相对平衡。在流动性充足的正常条件下，为每种代币分别估算的总流动性值通常接近。因此，舍入错误的影响是有限的。然而，当携带闲置余额的代币的可用余额变得极低时，缺陷就暴露出来了。在这种情况下，向下舍入的错误会显著放大。

攻击者通过执行一系列小额提款，将token0的可用余额从28 wei舍入到4 wei，从而利用了这个漏洞。这一降幅远远超出了实际烧毁的流动性份额的比例。与此同时，token1的可用余额保持相对正常水平。这种不平衡造成了一个巨大的套利窗口。下一章节将提供详细的数值分析。

攻击分析

以以太坊交易 [2] 为例，攻击者执行了一个三阶段的攻击：

• 第一阶段，攻击者通过操纵价格，大幅耗尽了USDC（token0）的可用余额。这创造了放大后续舍入错误所必需的初始条件。
• 第二阶段，通过一系列小额提款执行了核心攻击，导致协议低估了池的实际流动性。
• 第三阶段，攻击者执行了两次定向交易，套利了协议低估的流动性与池的实际流动性之间的差异，最终获利。

阶段一：操纵价格并减少目标代币余额

攻击者执行了三次交易，将USDC（token0）相对于USDT（token1）的价格从初始的tick=-1操纵到tick=5000。主要目的是耗尽池中USDC的活跃余额，将其降低到极低的28 wei水平。这为下一阶段放大舍入错误创造了必要的初始条件。

阶段二：利用提款放大流动性差异

攻击者通过withdraw()函数发起了44次小额提款。由于该函数在更新闲置余额时使用了向下舍入，协议的闲置余额被高估。这进一步导致queryLDF()函数中的USDC可用余额被低估。在重复操作后，USDC可用余额从28 wei异常压低至4 wei。这代表实际减少了85.7%，远远超过了所移除流动性份额的理论比例（即700000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000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