BlockSec DeFi攻擊分析系列之二傾囊相送：Sushiswap手續費被盜-ODAILY_QUO

去中心化金融(DeFi)作為區塊鏈生態當紅項目形態，其安全尤為重要。從去年至今，發生了幾十起安全事件

BlockSec作為長期關注DeFi安全的研究團隊(https://blocksecteam

_toWETH函數：

function_toWETH(addresstoken)internalreturns(uint256){//對于SUSHI，直接Sushimaker全部SUSHI轉給Barif(token==sushi){uintamount=IERC20(token)

//對于WETH，直接將全部WETH轉給WETH/SUSHI交易對，swap出相應的SUSHIif(token==weth){uintamount=IERC20(token)

//獲取token/WETH的交易對地址IUniswapV2Pairpair=IUniswapV2Pair(factory

//計算可以換出的WETH數量：amount0out，amount1Out//獲得交易對中兩種資產的數量(uintreserve0,uintreserve1,)=pair

看出什么亮點了嗎？

SushiMaker里的轉賬邏輯都是：transfer(balanceOf(this))

我們可以分兩個階段來看convert的調用過程：第一個階段：在convert函數中SushiMaker擁有的是SLP，它通過burnbalanceOf(this)實現將全部SLP換成兩個底層代幣第二個階段：SushiMaker獲得了burn來的底層代幣，再拿burn得到的token去不同的交易池換wETH

你發現哪里有問題了嗎？我們來看第二階段的代碼_toWETH：注意兌換的邏輯為：

uintamount=IERC20(token)

,"profit":"0

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Blocto原生Token BLT上線Aptos網絡，與PancakeSwap合作推出糖漿池:據官方消息，跨鏈智能錢包Blocto宣布其原生Token BLT已上線Aptos網絡，并與Pancake Swap合作推出糖漿池，用戶質押CAKE可賺取BLT收益。據官方介紹，目前暫無Blocto官方的BLTToken橋接或傳送服務，相關信息將至少在發布前5天公布；最初發送至Aptos網絡的BLT將用于Aptos上的流動性提供和Blocto生態基金。

據CoinGecko數據顯示，Blocto（BLT）現報價0.055美元，24小時漲幅8.8%。據PancakeSwap行情數據顯示，Aptos網絡BLT現報價0.11美元，24小時漲幅38.24%。[2023/3/6 12:44:50]

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,{"YFI/WETH":{"0x1b0eb70bc4d2407745df416acf6e2c312d25ee63c7e8e1291545d66e23fbf704":"PreAttack","0x8f6caabd4ecfad30793db76f60a7e28832a18e2bcf006c0ee3652063c7386778":"Convert","0xe6d28052b55ab520a211daebbc67ee3aece6ae356044e9352fc82910214a038a":"Swap"},"profit":"-0

礦機生產商 ePIC Blockchain 完成 750 萬美元 A 輪融資:Coindesk報道，總部位于多倫多的礦機生產商ePICBlockchain完成750萬美元A輪融資。ePICBlockchain表示，將使用該筆資金為北美地區生產ASIC加密礦機。[2021/4/15 20:21:54]

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,{"SEEN/WETH":{"0xc6b39015ab0a32762fb23108e9705cb30d171374c7f9d4b9cf30e640f43d4884":"PreAttack","0x3c14c48007147f78ae3c3ac5d56f74413ebc468c6e09f7eb1098c19b9b546185":"Convert","0x8681b43b4814bb54f49650b19d42133c933bcdbc65dfcd36a6cadf7ef916391c":"Swap"},"profit":"1

Blockstream首席戰略官：10萬美元價格對比特幣來說是保守的:Blockstream首席戰略官Samson Mow剛剛發推稱，有些人不認為比特幣能達到10萬美元。在2016年減半后，比特幣價格是650美元。一年后，它達到了2000美元，幾個月后又達到了1.9萬美元。比特幣的波動非常迅速和猛烈。10萬美元是保守的。[2020/7/30]

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,{"REVV/WETH":{"0x59b5e394caf35f5bbe603b42044707cbb20712d765c260da4434fde0fd3c0e15":"PreAttack","0x45660abd04d88f0dae0524b40182d11cb57710316e58ac14413909a9aaf44869":"Convert","0xcd8749d61d8e96da48de8bd641280f2ce8d93aa5e1e44c9144d322d8b01b1c81":"Swap"},"profit":"0

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聲音 | Blocknox董事總經理：將在規定截止日期前提交加密托管服務申請:根據德國1月1日生效的法規，希望提供加密托管服務的金融機構必須獲得德國聯邦金融監管局（BaFin）的授權。BaFin稱，新法律生效時已擁有加密托管業務的金融機構若想繼續提供服務，需在3月31日前以書面形式提交意向書。新法律生效時沒有加密托管業務的銀行在獲得BaFin批準前，不能開始提供該服務。目前40家銀行已提交意向書。

德國第二大證券交易所Boerse Stuttgart子公司Blocknox董事總經理Ulli Spankowski稱，Blocknox將在規定截止日期前提交最終申請。BaFin稱，未能在3月31日之前提交意向書的銀行必須停止提供現有加密托管服務。意向書本身并不取代申請，對申請是否獲得批準沒有影響。已提交意向書的金融機構應在11月30日前完成申請，否則在該日期前停止加密服務。BaFin指出，發放許可所需時間長短取決于具體情況；仍在最后敲定其行政做法，以批準和持續監督新加密服務。

據此前報道，Blocknox已推出加密資產托管服務，并向Boerse Stuttgart的BISON應用程序及其數字資產交易所BSDEX用戶提供該服務。（Bitcoin.com）[2020/2/20]

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,{"CORE/WETH":{"0xa01fd6fcfee90a7a2b0a180e7271b9429e9f23cf502ba7966932e5012c1bc9b7":"PreAttack","0x05af95d603cba12d9ca14ce307a973c8875cdcb2e70b07b295440cd2940ea953":"Convert","0x9bb8b7ca5b41c55a8efcdcd49fdec16747ccee0bf33df8e8f4d62eb116142b21":"Swap"},"profit":"0

動態 | Blockstack聘請做市商GSR Market以提高STX代幣流動性:根據10月24日提交給美國SEC的一份文件，Blockstack將向做市商GSR Market支付資金，用于提高美國以外的市場的STX代幣流動性。GSR方面已同意一次性收取10萬美元費用，此后六個月每月收取2萬美元。Blockstack還將借出價值100萬美元的BTC和ETH，利率為零，為交易提供資金。 曾在Cinnober擔任區塊鏈主管的Eric Wall表示，聘請專業做市商提供流動性是傳統市場的一種常見做法，也已成為加密市場的一種做法。他解釋稱，如果沒有這些市場參與者，當實際訂單太少時，代幣的波動性可能會飆升。這可能使人們不愿交易這種代幣，進而給發行方帶來負面影響。[2019/10/31]

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后續攻擊者又嘗試攻擊Sushiswap的其他相關仿盤項目，如LuaSwap：

https://etherscan

function_toETH(addresstoken){..

New：0x280ac711bb99dE7C73FB70fb6DE29846D5e4207Ffunctionconvert(addresstoken0,addresstoken1)public{//Atleastwetrytomakefront-runninghardertodo

function_toETH(addresstoken,uintamountIn){...}

可以看到區別在于：代碼第26行_toWETH限制了amount，這樣修改以后就不會將SushiMaker中存的全部SLP都去池中換成wETH，而只是換取burn出的一部分

但是這樣問題就解決了嗎？其實還沒有，時隔兩個月，同樣的地方，Sushiswap又中槍了見：amenda：SushiSwap攻擊事件(2021年1月27號)分析(https://zhuanlan.zhihu.com/p/372058217)

0x3.參考

以小博大，簡述SushiSwap攻擊事件始末：https://www.chainnews.com/zh-hant/articles/726256718885.htm

Astokenpricerisesandreputationmends,Sushiswapfoilsmidnightexploit:https://cointelegraph.com/news/as-token-price-rises-and-reputation-mends-sushiswap-foils-midnight-exploit

AnevolutionofUniswapwithSUSHItokenomics：https://sushichef.medium.com/the-sushiswap-project-dd6eb80c6ba2

一文看懂Uniswap和Sushiswap：https://zhuanlan.zhihu.com/p/226085593

sokdecentralizedexchanges(dex)withautomatedmarketmaker(amm)protocols:https://arxiv.org/abs/2103.12732

AttackingtheDeFiEcosystemwithFlashLoansforFunandProfit:https://arxiv.org/abs/2003.03810

https://www.blocksecteam.com/

contact@blocksecteam.com

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