Infinite Mint Attack
Definition pending verification.
An infinite mint attack, often referred to as a 'mint glitch' or 'reentrancy vulnerability' in the context of smart contracts, is a type of exploit where an attacker manipulates a contract's logic to mint an arbitrarily large amount of tokens or assets. This typically occurs in decentralized finance (DeFi) protocols, particularly those involving token minting, lending, or collateralization mechanisms. The core vulnerability often lies in how the contract handles external calls or updates its internal state during a transaction. For instance, a contract might allow a user to deposit collateral, mint a new token based on that collateral, and then withdraw the collateral, all within a single transaction. If the contract mints the new token before verifying the collateral deposit or updating its internal state correctly, an attacker could trigger the minting function multiple times within the same transaction context. Each call could mint more tokens based on the same initial (or insufficiently verified) collateral, leading to the creation of 'infinite' or vastly inflated amounts of tokens out of thin air. This devalues the token and can drain the protocol's reserves. Preventing such attacks requires careful smart contract design, including the use of checks-effects-interactions pattern, reentrancy guards, proper state updates before external calls, and thorough auditing.
graph LR
Center["Infinite Mint Attack"]:::main
Pre_logic["logic"]:::pre --> Center
click Pre_logic "/terms/logic"
Rel_advanced_propulsion_systems["advanced-propulsion-systems"]:::related -.-> Center
click Rel_advanced_propulsion_systems "/terms/advanced-propulsion-systems"
Rel_consciousness_simulation_hardware["consciousness-simulation-hardware"]:::related -.-> Center
click Rel_consciousness_simulation_hardware "/terms/consciousness-simulation-hardware"
Rel_cognitive_enhancement["cognitive-enhancement"]:::related -.-> Center
click Rel_cognitive_enhancement "/terms/cognitive-enhancement"
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🧒 Explain Like I'm 5
Imagine a magical cookie machine that's supposed to give you one cookie for each gold coin you put in. If the machine is broken, you might be able to put in one coin, get a cookie, and then use *that* cookie to trick the machine into thinking you put in another coin, getting infinite cookies!
🤓 Expert Deep Dive
Infinite mint attacks exploit flaws in the state transition logic of smart contracts, often related to reentrancy or incorrect handling of external calls. A common pattern involves a function that: 1) Accepts user input (e.g., collateral). 2) Performs an external call (e.g., to an ERC777 token contract that triggers a callback). 3) Updates internal state (e.g., mints tokens, updates balances). If the external call triggers a reentrant call back into the original function before the state is updated (e.g., the collateral is fully accounted for or the balance is adjusted), the attacker can exploit this. For example, in a lending protocol, a user deposits collateral C, calls mint(loan_amount), which internally calls an external token contract. This token contract's fallback function re-enters the mint function, allowing the attacker to mint again using the same collateral C before the first mint call completes its state update. The Checks-Effects-Interactions pattern is crucial: verify conditions (Checks), update internal state (Effects), then interact with external contracts (Interactions). Reentrancy guards (mutexes) can also prevent recursive calls within the same transaction context. Vulnerabilities can also arise from ERC777's reentrancy capabilities or flawed ERC20 implementations.