CVE-2018-13523 in SmartPayment
Summary
by MITRE
The mintToken function of a smart contract implementation for SmartPayment, 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 • 02/27/2020
The vulnerability identified in CVE-2018-13523 represents a critical integer overflow flaw within the mintToken function of the SmartPayment 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 contracts. The flaw occurs when the mintToken function processes token minting operations without proper overflow checks, allowing the contract owner to manipulate user balances arbitrarily.
The technical implementation of this vulnerability stems from the lack of input validation and overflow protection within the mintToken function. When the contract owner invokes this function, they can specify arbitrary values for both the target user address and the token amount to be minted. Due to the absence of proper integer bounds checking, the system allows for values that exceed the maximum limit of the underlying data type, resulting in unexpected behavior where the balance overflows and wraps around to an incorrect value. This overflow condition enables the malicious owner to set any user's balance to any desired amount, including potentially infinite values or negative balances.
The operational impact of this vulnerability is severe and far-reaching for the SmartPayment token ecosystem. The contract owner can manipulate user balances to create artificial wealth for specific addresses or drain funds from other users, fundamentally compromising the integrity of the token's distribution and value system. This vulnerability undermines the core principles of blockchain security and trust, as it allows for unauthorized balance manipulation that could lead to financial losses for token holders. The implications extend beyond individual user accounts to potentially destabilize the entire token economy and erode confidence in the smart contract implementation.
Mitigation strategies for this vulnerability require immediate implementation of proper integer overflow protection mechanisms. The smart contract code must be updated to include comprehensive input validation and bounds checking before any arithmetic operations are performed. The mintToken function should incorporate overflow detection using modern Solidity practices such as SafeMath libraries or explicit overflow checks. Additionally, access controls should be strengthened to ensure that only authorized entities can invoke minting operations, and all transactions should be logged for audit purposes. The contract should also implement proper event logging to track balance changes and maintain transparency in the token ecosystem. Regular security audits and formal verification processes should be established to prevent similar vulnerabilities from emerging in future contract implementations.