CVE-2018-13638 in Bitpark
Summary
by MITRE
The mintToken function of a smart contract implementation for Bitpark, 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-2018-13638 represents a critical integer overflow flaw within the mintToken function of Bitpark's Ethereum smart contract implementation. This vulnerability falls under the CWE-190 category of Integer Overflow or Wraparound, which occurs when an arithmetic operation results in a value that exceeds the maximum representable value for the data type being used. The specific implementation flaw allows the contract owner to manipulate token balances through a function that should logically only mint new tokens, creating an unexpected and dangerous pathway for account manipulation. The vulnerability exists due to the absence of proper input validation and overflow checks within the mintToken function, enabling malicious actors with owner privileges to exploit the arithmetic operation that calculates new token balances.
The operational impact of this vulnerability extends beyond simple balance manipulation to potentially compromise the entire token economy and user trust within the Bitpark ecosystem. When an integer overflow occurs in the mintToken function, the owner can effectively set any user's balance to an arbitrary value, including zero or extremely large values that could disrupt the token's economic model. This vulnerability creates a direct pathway for unauthorized balance manipulation that could lead to token theft, inflation of token supply, or manipulation of token distribution. The attack vector is particularly concerning because it requires only owner privileges, which typically should be restricted to authorized administrators, but the flaw allows for dangerous operations that bypass normal tokenomics principles. The vulnerability can be exploited to create infinite token balances or manipulate user holdings in ways that could destabilize trading markets and undermine the token's utility within the Ethereum ecosystem.
Security practitioners should recognize this vulnerability as a prime example of how insufficient input validation and lack of proper overflow protection can create critical weaknesses in smart contract implementations. The ATT&CK framework's technique T1068, "Exploitation for Privilege Escalation," applies directly to this scenario where the contract owner leverages their elevated privileges to exploit the integer overflow. Mitigation strategies must include comprehensive input validation, proper overflow and underflow checks using modern Solidity versions with overflow protection, and the implementation of proper access control mechanisms. The recommended remediation involves adding explicit checks to ensure that arithmetic operations within the mintToken function cannot result in integer overflow conditions, typically through the use of require statements that validate input parameters and prevent operations that would exceed maximum integer values. Additionally, contract owners should implement regular security audits and utilize formal verification methods to identify similar vulnerabilities before deployment, as this type of flaw can have cascading effects on user funds and token integrity within decentralized applications. The vulnerability underscores the critical importance of adhering to secure coding practices in blockchain development and the necessity of comprehensive testing before smart contract deployment.