CVE-2018-13646 in Datiac
Summary
by MITRE
The mintToken function of a smart contract implementation for Datiac, 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-2018-13646 represents a critical integer overflow flaw within the mintToken function of a Datiac Ethereum token smart contract implementation. This vulnerability falls under the CWE-190 category of integer overflow and under the ATT&CK technique T1059.006 for execution through smart contract manipulation. The flaw exists in the contract's token minting mechanism where the owner can exploit the overflow condition to manipulate user balances arbitrarily. The integer overflow occurs when the contract attempts to increment a token balance beyond its maximum representable value, causing the value to wrap around to zero or a negative number, which creates a predictable pattern that can be exploited.
The technical exploitation of this vulnerability allows the contract owner to manipulate any user's token balance to any desired value by carefully calculating the overflow conditions. This occurs because the smart contract does not properly validate or sanitize the input values during the minting process, specifically when the mintToken function is called with parameters that trigger the integer overflow. The vulnerability is particularly dangerous because it grants the contract owner unprecedented control over the token distribution, enabling them to create unlimited tokens or manipulate existing user holdings. This type of flaw demonstrates poor input validation and insufficient boundary checking in smart contract development practices.
The operational impact of this vulnerability extends beyond simple balance manipulation to potentially compromise the entire token economy and user trust in the Datiac platform. An attacker with access to the contract owner account could inflate their own holdings while simultaneously reducing or eliminating other users' balances, effectively creating a form of theft or manipulation that undermines the fundamental principles of blockchain tokenomics. The vulnerability also creates a potential attack vector for financial loss, as users may lose their token holdings or face unexpected balance changes. This type of flaw directly impacts the security and integrity of the Ethereum-based token ecosystem and demonstrates the critical need for proper smart contract auditing and security testing before deployment.
Mitigation strategies for this vulnerability require immediate contract fixes that implement proper integer overflow protection mechanisms and comprehensive input validation. Developers should utilize safe math libraries such as OpenZeppelin's SafeMath to prevent overflow conditions, implement proper boundary checks on all token operations, and conduct thorough security audits before deployment. The fix involves modifying the mintToken function to include overflow detection before performing arithmetic operations and ensuring that all balance updates are validated against maximum token supply limits. Additionally, contract owners should implement proper access controls and consider using multi-signature wallets to prevent unauthorized access to privileged functions. Regular security assessments and adherence to smart contract security best practices are essential to prevent similar vulnerabilities in future implementations, as this type of flaw represents a common category of smart contract security issues that can be prevented through proper development practices and security testing protocols.