CVE-2018-13478 in DMPToken
Summary
by MITRE
The mintToken function of a smart contract implementation for DMPToken, an Ethereum 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 • 02/26/2020
The CVE-2018-13478 vulnerability represents a critical integer overflow flaw within the mintToken function of the DMPToken smart contract deployed on the Ethereum blockchain. This vulnerability stems from inadequate input validation and arithmetic overflow handling within the contract's code implementation, creating a fundamental security weakness that directly impacts the contract's integrity and user fund safety. The vulnerability is classified under CWE-190 as an integer overflow or wraparound, which occurs when an arithmetic operation produces a result that exceeds the maximum value that can be represented by the underlying data type, causing the value to wrap around to a smaller number.
The technical flaw manifests specifically in the mintToken function where the contract fails to properly validate the amount parameter before performing arithmetic operations on user balances. When an attacker exploits this vulnerability, they can manipulate the token minting process to set any user's balance to an arbitrary value, effectively allowing for unlimited token creation or manipulation of existing balances. This occurs because the smart contract does not implement proper overflow checks before incrementing or modifying token balances, enabling malicious actors to craft specific input values that cause the arithmetic operations to overflow and produce unintended results.
The operational impact of this vulnerability extends far beyond simple balance manipulation, as it fundamentally compromises the trust model of the token contract and can lead to significant financial losses for users and the project ecosystem. An attacker with access to the contract owner privileges can systematically drain or inflate token balances across multiple user accounts, potentially causing market manipulation, loss of user confidence, and complete contract failure. The vulnerability affects the core functionality of the token system by allowing unauthorized balance modifications that bypass normal transactional constraints and validation mechanisms, creating a persistent security risk that remains active until the underlying code is patched.
Mitigation strategies for CVE-2018-13478 require immediate implementation of proper input validation and overflow protection mechanisms within the smart contract code. The recommended approach involves adding explicit overflow checks using modern solidity practices such as require statements with bounds validation, implementing the SafeMath library to handle arithmetic operations safely, and ensuring all balance modifications are validated against reasonable limits. Organizations should also conduct comprehensive smart contract audits and implement proper access control mechanisms to prevent unauthorized modification of critical functions. This vulnerability aligns with ATT&CK technique T1499.004 which involves data manipulation through financial or cryptographic means, and represents a classic example of how insufficient input validation can create persistent security vulnerabilities in decentralized applications. The fix requires code modifications that enforce proper arithmetic boundaries and implement comprehensive error handling for all mathematical operations within the contract's core functions.