DelegateCall is a low-level opcode in the Ethereum Virtual Machine (EVM) that allows a smart contract to execute code from another contract. When a contract uses delegatecall, the code from the target contract runs within the context of the calling contract. This means the calling contract’s storage, balance, and msg.sender are utilized during execution. It is a powerful feature primarily employed for upgradable contracts and library patterns.
Context
The delegatecall function is a critical component in the architecture of many decentralized applications, enabling modularity and efficient code reuse. However, its misuse or improper implementation can introduce severe security vulnerabilities, particularly reentrancy attacks. News often covers incidents where delegatecall exploits have led to significant asset losses. Developers prioritize careful auditing and secure coding practices when employing this operation.
A critical `delegateCall` vulnerability in a multi-signature wallet enabled unauthorized administrative control and token minting, posing systemic risk.
A delegateCall vulnerability in UXLINK's multi-signature wallet allowed attackers to seize control, mint tokens, and drain $11.3 million in assets, highlighting critical governance and key management flaws.
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