CVE-2018-13657 in Rice
Summary
by MITRE
The mintToken function of a smart contract implementation for Rice, 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 as CVE-2018-13657 resides within the mintToken function of a smart contract implementation for the Rice Ethereum token, representing a critical integer overflow flaw that fundamentally compromises the contract's integrity and security model. This vulnerability falls under the CWE-190 category of integer overflow and under the ATT&CK technique T1548.001 for privilege escalation through code injection or manipulation. The flaw enables the contract owner to manipulate user balances arbitrarily, effectively undermining the core principles of decentralized finance and token economics that Ethereum smart contracts are designed to enforce.
The technical implementation of this vulnerability stems from improper input validation and arithmetic operations within the mintToken function where the contract fails to properly check for overflow conditions when performing balance calculations. When the owner invokes this function with malicious parameters, the integer overflow allows them to manipulate the target user's balance to any desired value, including potentially infinite amounts or negative balances that could be exploited to drain funds from other users or the contract itself. This flaw demonstrates a fundamental lack of proper boundary checking and arithmetic overflow protection that is essential in smart contract development, particularly when dealing with financial operations and user balance management.
The operational impact of this vulnerability is severe and multifaceted, as it provides the contract owner with unprecedented control over the token ecosystem and user funds. An attacker with owner privileges can arbitrarily inflate or deflate user balances, potentially creating an unlimited supply of tokens, causing the token economy to collapse, or manipulating market dynamics to their advantage. This vulnerability directly violates the trust model that users place in decentralized applications and smart contracts, as it allows the owner to act as both the administrator and the malicious actor simultaneously. The implications extend beyond simple financial manipulation to potentially destabilizing the entire token economy and undermining user confidence in the platform.
Mitigation strategies for this vulnerability require immediate implementation of comprehensive input validation and overflow protection mechanisms within the smart contract code. Developers must ensure that all arithmetic operations include proper boundary checks and that integer overflows are explicitly handled through safe math libraries or custom overflow detection functions. The contract owner should also implement proper access controls and audit logging to track all mint operations and balance modifications. Additionally, the vulnerability highlights the critical importance of thorough smart contract auditing and formal verification processes before deployment, as well as adherence to established security frameworks such as the OpenZeppelin security guidelines and the Solidity best practices for preventing arithmetic overflow conditions. Regular security assessments and continuous monitoring of contract behavior are essential to detect and prevent similar vulnerabilities in the evolving Ethereum ecosystem.