CVE-2018-13713 in Tradesman
Summary
by MITRE
The mintToken function of a smart contract implementation for Tradesman, 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 mintToken function in the Tradesman Ethereum token smart contract contains a critical integer overflow vulnerability that fundamentally compromises the contract's integrity and user asset security. This vulnerability exists within the token's core functionality where the owner can manipulate user balances through improper integer handling during token minting operations. The flaw allows an attacker with owner privileges to set any user's token balance to an arbitrary value, effectively enabling unauthorized wealth creation or destruction within the token ecosystem.
This vulnerability directly maps to CWE-190, Integer Overflow or Wraparound, which occurs when a program performs a calculation using integer values that exceed the maximum value that can be represented by the data type. In the context of Ethereum smart contracts, this typically manifests when arithmetic operations are performed without proper overflow checks, particularly in functions that modify token balances or total supply. The specific implementation flaw in Tradesman's mintToken function demonstrates a failure to validate input parameters and perform boundary checks on integer values during balance modifications.
The operational impact of this vulnerability extends beyond simple balance manipulation to encompass potential systemic risks within the token economy. An attacker with owner access can artificially inflate user balances to create artificial scarcity or deflate balances to cause user losses, effectively enabling economic manipulation and potential theft of funds. This vulnerability undermines the fundamental trust in the token's supply mechanism and user account integrity. The consequences are particularly severe given that the vulnerability affects the token's total supply calculation and individual user balance tracking, creating opportunities for both direct financial gain and broader market disruption. The vulnerability also exposes the contract to potential reentrancy attacks and other cascading failures that could compound the initial exploitation.
Mitigation strategies for this vulnerability require immediate implementation of proper integer overflow protections within the smart contract code. Developers must implement comprehensive input validation and boundary checking mechanisms before any arithmetic operations that modify token balances or supply values. The recommended approach involves utilizing safe math libraries or implementing explicit overflow checks using require statements that verify integer bounds before calculations. Additionally, contract owners should implement proper access control measures and consider multi-signature ownership arrangements to reduce the risk of unauthorized exploitation. The vulnerability highlights the critical importance of formal verification processes and comprehensive security auditing for smart contracts before deployment. Organizations should also implement monitoring systems to detect unusual balance changes or supply modifications that could indicate exploitation attempts. From an ATT&CK framework perspective, this vulnerability represents a privilege escalation technique that allows attackers to manipulate the token economy and could be leveraged for financial gain through cryptocurrency theft or market manipulation. The vulnerability demonstrates how seemingly minor implementation flaws in smart contract code can create significant security risks that affect entire token ecosystems and user trust in decentralized applications.