CVE-2018-13596 in TESTAhihi
Summary
by MITRE
The mintToken function of a smart contract implementation for TESTAhihi, 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-2018-13596 represents a critical integer overflow flaw within the mintToken function of the TESTAhihi Ethereum token smart contract implementation. This vulnerability stems from improper input validation and arithmetic handling within the contract's code, creating a fundamental security weakness that directly impacts the token's integrity and user fund safety. The flaw allows the contract owner to manipulate user balances arbitrarily, effectively undermining the core principles of blockchain-based asset management and trustless transactions that Ethereum smart contracts are designed to provide.
The technical exploitation of this vulnerability occurs through the mintToken function's failure to properly validate or constrain integer values during balance calculations. When the owner invokes this function, they can manipulate the underlying integer arithmetic to cause overflow conditions that result in unintended balance modifications. This type of vulnerability is classified as CWE-190, which specifically addresses integer overflow and underflow conditions in software implementations. The root cause lies in the absence of proper bounds checking and overflow detection mechanisms within the smart contract's mathematical operations, allowing malicious or accidental manipulation of token supply and user balances.
The operational impact of this vulnerability extends far beyond simple balance manipulation, as it fundamentally compromises the security model of the TESTAhihi token ecosystem. An attacker with owner privileges can arbitrarily increase or decrease any user's token balance, potentially leading to unlimited token creation, unauthorized fund transfers, or complete disruption of the token's economic model. This vulnerability creates an attack surface that allows for potential financial loss of user assets and undermines confidence in the token's legitimacy. The implications are particularly severe because Ethereum smart contracts operate in a trustless environment where users expect their funds to be protected by the immutable code, yet this vulnerability allows for arbitrary code execution through legitimate contract functions.
Mitigation strategies for this vulnerability require immediate code-level fixes including the implementation of proper integer overflow detection mechanisms, comprehensive input validation, and the use of established secure coding practices for Ethereum smart contracts. The recommended approach involves incorporating overflow checks using modern Solidity versions that include built-in overflow protection or implementing explicit validation routines before any arithmetic operations. Organizations should also consider implementing multi-signature ownership controls and regular security audits to prevent unauthorized access to privileged functions. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and arbitrary code execution within smart contract environments, highlighting the importance of proper access control and input sanitization in blockchain security implementations.