CVE-2018-13492 in naga
Summary
by MITRE
The mintToken function of a smart contract implementation for naga, 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.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 08/27/2024
The vulnerability described in CVE-2018-13492 represents a critical integer overflow flaw within the mintToken function of an Ethereum-based smart contract implementation for the naga token. This vulnerability resides in the core token management logic and fundamentally compromises the integrity of the token distribution mechanism. The flaw allows the contract owner to manipulate user balances arbitrarily, effectively creating a mechanism for unauthorized token generation and distribution that bypasses normal transactional constraints. The integer overflow occurs when the mintToken function processes token minting operations without proper boundary checks on the balance calculations, enabling the owner to manipulate the internal accounting system through carefully crafted input values.
From a technical perspective this vulnerability maps directly to CWE-190, which specifically addresses integer overflow conditions, and represents a classic example of insufficient input validation in smart contract code. The flaw exploits the fundamental arithmetic limitations of fixed-width integer representations within the Ethereum Virtual Machine, where operations exceeding maximum value limits cause wraparound behavior. The attacker can leverage this by calculating specific values that, when processed through the vulnerable mintToken function, result in the desired target balance being set for any user account. This creates a scenario where the contract owner can effectively mint unlimited tokens for arbitrary addresses, completely undermining the token's scarcity model and economic integrity.
The operational impact of this vulnerability extends far beyond simple balance manipulation, as it fundamentally compromises the trust model of the entire token ecosystem. The contract owner can set balances to arbitrary values including zero, maximum values, or even negative representations that may cause additional unexpected behaviors in downstream systems. This vulnerability enables potential financial loss for token holders, as the owner could artificially inflate their own holdings while reducing others' balances, or create artificial scarcity conditions. The impact is particularly severe in decentralized finance applications where such manipulation could affect lending protocols, staking mechanisms, or other smart contract interactions that depend on accurate token balances. The vulnerability also creates potential chain reaction effects where other contracts dependent on naga token balances may behave unpredictably, as highlighted by ATT&CK technique T1499.001 which addresses data manipulation and integrity compromise in networked systems.
Mitigation strategies for this vulnerability require immediate implementation of comprehensive input validation mechanisms within the smart contract code. The mintToken function must incorporate proper boundary checks using safe arithmetic operations that prevent overflow conditions, typically through the use of libraries like OpenZeppelin's SafeMath or similar implementations that handle integer operations with overflow protection. Additionally, the contract owner should implement proper access control measures and consider using multi-signature wallets for administrative functions to reduce the risk of unauthorized manipulation. Regular security audits and formal verification processes should be implemented to identify similar patterns across the entire codebase, as integer overflows are a common class of vulnerabilities in smart contract development. The vulnerability also underscores the importance of implementing comprehensive testing procedures including fuzz testing and property-based testing to identify edge cases in arithmetic operations that may lead to similar overflow conditions in other contract functions.