CVE-2018-13183 in JWC
Summary
by MITRE
The mintToken function of a smart contract implementation for JWC, 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 vulnerability identified in CVE-2018-13183 represents a critical integer overflow flaw within the mintToken function of the JWC Ethereum token smart contract implementation. 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 beyond normal operational parameters, creating a fundamental security breach that undermines the integrity of the token economy.
The technical execution of this vulnerability occurs through the mintToken function which lacks proper overflow checks during arithmetic operations. When the contract owner invokes this function, they can manipulate the underlying integer calculations to produce unexpected results that exceed the maximum representable values for the data types involved. This creates a scenario where the balance of any arbitrary user can be set to an arbitrary value, effectively allowing the owner to mint tokens without proper authorization or limit. The vulnerability aligns with CWE-190, which specifically addresses integer overflow and underflow conditions, and represents a classic example of improper integer handling in smart contract development.
The operational impact of this vulnerability extends far beyond simple balance manipulation and creates a comprehensive threat to the token ecosystem. An attacker with owner privileges can arbitrarily inflate or deflate user balances, potentially leading to unlimited token creation, unauthorized wealth transfer, or complete disruption of the token's economic model. This vulnerability fundamentally compromises the trustless nature of the blockchain system, as the contract owner can essentially rewrite the rules of token distribution at will. The implications for token holders are severe, as their holdings can be arbitrarily altered without any legitimate justification or process.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term smart contract security practices. The primary solution involves implementing proper overflow checks using modern Solidity versions that include built-in overflow protection mechanisms or explicit validation routines before any arithmetic operations. Additionally, contract owners should implement proper access controls and consider using libraries such as OpenZeppelin's SafeMath for arithmetic operations to prevent such vulnerabilities. The remediation process should also include comprehensive code auditing and testing procedures that specifically target integer overflow conditions. This vulnerability demonstrates the critical importance of adhering to established security frameworks and best practices in smart contract development, as outlined in various security standards including those referenced in the ATT&CK framework for blockchain-based threats, which emphasizes the need for proper input validation and arithmetic operation safety in decentralized applications.