CVE-2018-13548 in Mimicoin
Summary
by MITRE
The mintToken function of a smart contract implementation for Mimicoin, 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-2018-13548 represents a critical integer overflow flaw within the mintToken function of Mimicoin's smart contract implementation on the Ethereum blockchain. This vulnerability stems from improper input validation and arithmetic operations that fail to account for the maximum limits of integer data types. The flaw allows the contract owner to manipulate token balances in ways that can fundamentally compromise the integrity of the entire token ecosystem. The technical nature of this vulnerability places it squarely within the scope of CWE-191, which specifically addresses integer underflow and overflow conditions that can lead to unexpected behavior in software systems.
The operational impact of this vulnerability extends far beyond simple balance manipulation, as it provides the contract owner with unprecedented control over the token distribution and user account states. An attacker with owner privileges can arbitrarily set any user's token balance to any value, including zero, negative values, or extremely large amounts that could potentially disrupt the token's economic model. This capability enables a range of malicious activities such as creating unlimited supply tokens, manipulating trading prices, or completely depleting user accounts. The vulnerability fundamentally undermines the trust model that blockchain systems rely upon, as it allows for unauthorized modification of user states without any legitimate justification.
From a cybersecurity perspective, this vulnerability demonstrates the critical importance of proper input validation and arithmetic boundary checking in smart contract development. The flaw represents a classic example of how insufficient security measures during smart contract development can lead to severe consequences that affect all participants in the network. The ATT&CK framework categorizes this as a privilege escalation technique where the contract owner leverages a code vulnerability to gain unauthorized control over user accounts. The vulnerability also intersects with several other attack vectors including supply chain attacks, as the compromised contract can be used to manipulate other systems that depend on the token's integrity, and data integrity attacks that compromise the fundamental assumptions of the blockchain's consensus mechanism.
The mitigation strategies for this vulnerability require immediate attention and implementation of multiple defensive measures. Smart contract developers must implement proper integer overflow protection through explicit bounds checking, use secure arithmetic libraries, and employ formal verification techniques to identify such flaws before deployment. Additionally, contract owners should consider implementing multi-signature controls and time locks for critical functions to prevent unauthorized use of privileged operations. The industry standard recommendation involves adopting established frameworks such as the OpenZeppelin secure coding practices that provide well-tested implementations of common smart contract functions. Regular security audits and penetration testing should be conducted to identify similar vulnerabilities in existing smart contracts, as the Ethereum ecosystem continues to expand with thousands of deployed contracts that may contain similar flaws.