CVE-2018-13758 in LoliCoin
Summary
by MITRE
The mintToken function of a smart contract implementation for LoliCoin, 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 • 03/03/2020
The mintToken function in the LoliCoin Ethereum smart contract implementation contains a critical integer overflow vulnerability that fundamentally compromises the token's security model and financial integrity. This vulnerability exists within the contract's logic where the mintToken function fails to properly validate or constrain the amount of tokens being minted, creating an exploitable condition that allows the contract owner to manipulate user balances arbitrarily. The flaw represents a severe deviation from secure smart contract development practices and demonstrates a lack of proper input validation mechanisms that should be standard in any financial blockchain application.
The technical nature of this vulnerability stems from the absence of overflow checks in the mintToken function's arithmetic operations, specifically when dealing with token amount calculations. When the contract owner invokes this function, they can manipulate the token supply and user balances through unchecked integer arithmetic, potentially allowing them to set any user's balance to an arbitrary value including zero or extremely large amounts. This vulnerability directly maps to CWE-190, Integer Overflow or Wraparound, which is a well-documented weakness in software systems where arithmetic operations exceed the maximum representable value for the data type. The lack of proper boundary checking and validation in the smart contract code creates a pathway for privilege escalation and unauthorized balance manipulation.
The operational impact of this vulnerability extends far beyond simple financial manipulation, as it fundamentally undermines the trust model of the entire token ecosystem. An attacker with owner privileges can effectively drain or manipulate token distributions, create artificial scarcity, or even generate infinite tokens by exploiting the overflow condition. This creates cascading effects throughout the token's ecosystem, potentially affecting exchanges, wallet applications, and any third-party services that depend on the token's integrity. The vulnerability enables the contract owner to perform actions that should only be possible through legitimate token transfer mechanisms, effectively bypassing the normal transactional flow and creating a backdoor for unauthorized financial activities. The implications align with ATT&CK technique T1078.004, Valid Accounts, as the vulnerability allows unauthorized privilege escalation through the existing owner account rather than requiring account compromise.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security architecture improvements. The smart contract code must implement comprehensive input validation and overflow protection mechanisms, including explicit checks for maximum token limits and proper arithmetic boundary validation. Developers should adopt established secure coding practices such as using overflow-safe libraries like OpenZeppelin's SafeMath or implementing explicit underflow and overflow checks before any arithmetic operations. Additionally, the contract should undergo comprehensive security auditing and formal verification processes to identify similar vulnerabilities across all functions. The implementation of multi-signature ownership mechanisms and time-locks for critical operations can further reduce the risk of unauthorized exploitation. Regular security assessments and adherence to industry standards like the Solidity style guide and Ethereum smart contract security best practices are essential for maintaining the integrity of token implementations and preventing similar vulnerabilities from emerging in future versions of the codebase.