CVE-2018-13631 in doccoin
Summary
by MITRE
The mintToken function of a smart contract implementation for doccoin, 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 • 02/28/2020
The vulnerability identified in CVE-2018-13631 represents a critical integer overflow flaw within the mintToken function of the doccoin Ethereum token smart contract implementation. This vulnerability falls under the CWE-190 category of Integer Overflow or Wraparound, which occurs when an integer calculation exceeds the maximum value that can be represented by the data type, causing the value to wrap around to zero or a negative number. The specific implementation flaw allows the contract owner to manipulate token balances through improper handling of integer arithmetic operations.
The technical execution of this vulnerability occurs when the mintToken function processes token minting operations without proper validation of input parameters or overflow checking mechanisms. When the contract owner invokes this function, they can manipulate the balance of any user account to an arbitrary value, effectively bypassing normal token distribution and transfer restrictions. This vulnerability exploits the fundamental weakness in the smart contract's arithmetic handling, where the system fails to validate that the resulting balance value remains within acceptable bounds for the token's data type representation.
The operational impact of this vulnerability is severe and far-reaching within the Ethereum ecosystem. An attacker with owner privileges can manipulate token distributions to create unlimited tokens, potentially leading to massive dilution of existing token holdings or enabling fraudulent activities such as creating artificial wealth or manipulating token prices. The vulnerability undermines the core principles of blockchain token economics and trustless systems, as it allows for unauthorized balance manipulation that can affect the entire token economy and user confidence. This type of vulnerability directly impacts the security model of decentralized applications and can result in significant financial losses for users and the broader ecosystem.
Mitigation strategies for this vulnerability involve implementing comprehensive input validation and overflow checking mechanisms within the smart contract code. The recommended approach includes using SafeMath libraries or similar arithmetic libraries that automatically check for overflow conditions before performing calculations, ensuring that all integer operations maintain valid value ranges. Additionally, contract owners should implement proper access controls and audit procedures to prevent unauthorized execution of privileged functions, while also conducting thorough code reviews and security audits before deploying smart contracts to the mainnet. The vulnerability highlights the importance of adhering to established security practices and standards such as those outlined in the OpenZeppelin security guidelines and the Ethereum Smart Contract Best Practices recommendations. Organizations should also consider implementing formal verification techniques and continuous monitoring systems to detect and prevent similar vulnerabilities in future deployments. This particular vulnerability demonstrates the critical need for robust security testing and validation processes in smart contract development, as the immutable nature of blockchain transactions makes such flaws particularly dangerous and difficult to remediate once deployed.