CVE-2018-13177 in MiningRigRentals Token
Summary
by MITRE
The mintToken function of a smart contract implementation for MiningRigRentals Token (MRR), 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 • 02/25/2020
The mintToken function in the MiningRigRentals Token (MRR) smart contract implementation contains a critical integer overflow vulnerability that fundamentally compromises the token's integrity and security model. This vulnerability exists within the Ethereum blockchain ecosystem where smart contracts execute with absolute determinism and cannot be easily modified once deployed. The flaw specifically affects the token's ability to manage user balances through the mintToken function, which is designed to create new tokens and allocate them to specific addresses. When an attacker exploits this vulnerability, they can manipulate the token supply and user balances in ways that directly violate the fundamental principles of blockchain tokenomics and financial accounting.
The technical nature of this vulnerability stems from improper input validation and arithmetic operations within the smart contract code. The integer overflow occurs when the contract attempts to perform mathematical operations on token amounts that exceed the maximum value that can be stored in the designated data type. This condition allows an attacker with owner privileges to manipulate the internal accounting system of the token contract, enabling them to set arbitrary user balances to any value they choose. The vulnerability directly maps to CWE-190, Integer Overflow or Wraparound, which is classified as a critical weakness in software security where integer arithmetic operations produce results that exceed the maximum value that can be represented. The specific implementation flaw lies in the lack of proper bounds checking and overflow protection mechanisms within the mintToken function's mathematical operations.
The operational impact of this vulnerability extends far beyond simple accounting manipulation and creates significant risks for token holders, exchanges, and the broader ecosystem. An attacker with owner access can inflate or deflate user balances at will, potentially creating artificial scarcity or abundance of tokens, manipulating trading prices, or even transferring ownership of large token holdings to malicious addresses. This vulnerability undermines the trustless nature of blockchain systems and creates opportunities for financial fraud, market manipulation, and potential loss of funds for legitimate token holders. The attack surface is particularly concerning because it affects the core token functionality and allows for manipulation of the entire token distribution model, potentially enabling attackers to drain funds from the contract or create artificial market conditions that benefit their positions.
Mitigation strategies for this vulnerability require immediate attention and multiple layers of protection. The primary fix involves implementing proper input validation and bounds checking within the mintToken function to prevent integer overflow conditions. Smart contract developers should utilize safe math libraries that automatically detect and prevent overflow conditions, or implement explicit checks that validate input parameters before performing arithmetic operations. Additionally, the contract should undergo comprehensive security auditing by third-party firms specializing in blockchain security to identify similar vulnerabilities in other functions. The incident highlights the importance of following secure coding practices for smart contracts, including adherence to the principle of least privilege and implementing proper access controls. Organizations should also consider implementing multi-signature wallets for contract ownership and regular security monitoring to detect unauthorized access attempts. This vulnerability serves as a reminder that blockchain security requires continuous vigilance and that even seemingly simple functions can contain critical flaws that compromise entire systems. The ATT&CK framework for blockchain security would categorize this as a privilege escalation technique, where an attacker leverages existing administrative access to manipulate core contract functionality and achieve unauthorized control over token balances and distributions.