CVE-2018-13041 in Link Platform
Summary
by MITRE
The mint function of a smart contract implementation for Link Platform (LNK), an Ethereum ERC20 token, has an integer overflow that allows the owner of the contract to set the balance of an arbitrary user to any value.
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Analysis
by VulDB Data Team • 02/23/2020
The vulnerability identified as CVE-2018-13041 represents a critical integer overflow flaw within the mint function of the Link Platform (LNK) smart contract deployed on the Ethereum blockchain. This vulnerability specifically affects the ERC20 token implementation and stems from inadequate input validation and arithmetic handling within the contract's codebase. The flaw allows the contract owner to manipulate user balances through a mathematical overflow condition that occurs when attempting to mint new tokens, creating a scenario where the balance calculation exceeds the maximum value that can be stored in the designated data type.
The technical exploitation of this vulnerability occurs through the mint function's failure to properly validate or constrain integer values during the token creation process. When the owner invokes the mint function with specific parameters, the arithmetic operations involved in calculating new balances can overflow beyond the maximum representable value for the data type used, causing the system to wrap around to a much smaller value. This overflow behavior can be manipulated to set arbitrary user balances to predetermined values, effectively allowing the contract owner to create tokens without proper authorization or to manipulate existing user holdings. The vulnerability directly maps to CWE-190, which describes integer overflow and underflow conditions, and represents a classic example of improper integer handling in smart contract environments where such flaws can have severe financial implications.
The operational impact of this vulnerability extends far beyond simple balance manipulation, as it fundamentally compromises the integrity and trustworthiness of the token ecosystem. An attacker with access to the contract owner account can potentially drain funds from other users by setting their balances to zero, create artificial inflation by minting excessive tokens, or manipulate market dynamics through strategic balance adjustments. The vulnerability undermines the core principles of blockchain-based asset management, where transparency and immutability are paramount. From an attacker's perspective, this flaw provides a direct path to financial gain without requiring complex cryptographic attacks or network-level exploits, making it particularly dangerous for users who hold LNK tokens and for exchanges that list the token. The vulnerability also creates potential for cascading effects within the broader Ethereum ecosystem, as compromised tokens can affect trading pairs, liquidity pools, and other interconnected smart contracts that interact with the affected token.
Mitigation strategies for this vulnerability require immediate action from both developers and users within the affected ecosystem. The primary remediation involves implementing proper input validation and boundary checking within the mint function to prevent integer overflow conditions from occurring. Developers should utilize safe math libraries or implement explicit checks to ensure that arithmetic operations remain within valid ranges before performing calculations. Additionally, the contract should be audited for similar patterns that might exist elsewhere in the codebase, as integer overflows are a common class of vulnerability in smart contract development. The vulnerability also highlights the importance of proper access control and the principle of least privilege, where contract owner privileges should be carefully managed and potentially reduced through multi-signature requirements or time locks. From a security operations standpoint, users should monitor their token balances and consider transferring holdings to more secure implementations if the vulnerability remains unpatched. The incident also serves as a reminder of the critical importance of comprehensive smart contract auditing and the application of industry standards such as those outlined in the OpenZeppelin security guidelines and the Solidity best practices documentation. Organizations should also consider implementing monitoring solutions that can detect unusual minting activities or balance manipulations that might indicate exploitation attempts. The vulnerability demonstrates the need for continuous security assessment and the adoption of formal verification techniques to identify potential mathematical and logical flaws before they can be exploited in production environments.