CVE-2018-13600 in AMToken
Summary
by MITRE
The mintToken function of a smart contract implementation for AMToken, 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 • 02/28/2020
The vulnerability identified in CVE-2018-13600 represents a critical integer overflow flaw within the mintToken function of the AMToken smart contract implementation on the Ethereum blockchain. This vulnerability stems from inadequate input validation and arithmetic overflow handling within the contract's codebase, creating a fundamental security weakness that directly impacts the contract's integrity and user asset management capabilities. The flaw allows the contract owner to manipulate token balances in ways that should be impossible under normal operational conditions, fundamentally compromising the trust model that decentralized applications depend upon.
The technical implementation of this vulnerability occurs when the mintToken function processes token minting operations without proper overflow checks on the balance calculations. When the owner invokes this function with specific parameters, the integer overflow condition causes the balance arithmetic to wrap around to an unintended value, enabling the manipulation of any user's token balance to arbitrary amounts. This type of vulnerability falls under CWE-190, which specifically addresses integer overflow and underflow conditions, and represents a classic example of how insufficient bounds checking can lead to severe financial consequences in smart contract environments. The vulnerability exists because the contract implementation fails to validate that the resulting balance would not exceed the maximum value representable by the integer type used for balance storage.
The operational impact of this vulnerability extends far beyond simple balance manipulation, as it fundamentally undermines the security assumptions that users and developers rely upon when interacting with the token contract. An attacker with owner privileges can essentially create unlimited tokens for themselves or other users, potentially leading to massive dilution of token value or complete financial loss for affected parties. This vulnerability enables scenarios where malicious actors could drain contract reserves, manipulate market prices, or create artificial scarcity that benefits the attacker while harming legitimate token holders. The implications are particularly severe in DeFi ecosystems where such vulnerabilities can cascade through interconnected smart contracts and protocols, creating systemic risks that extend far beyond the immediate affected contract.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term architectural improvements to prevent similar issues in future implementations. The primary fix involves implementing proper integer overflow checks using modern Solidity practices such as require statements with bounds validation or utilizing safe math libraries that automatically handle overflow conditions. Additionally, contract owners should implement comprehensive access control measures and regular security audits to identify similar vulnerabilities. The remediation process should include thorough code review processes that specifically target arithmetic operations and input validation, aligning with ATT&CK framework techniques for smart contract security. Organizations should also consider implementing multi-signature ownership mechanisms and time-lock provisions for critical functions to reduce the attack surface and provide additional security layers against unauthorized manipulation of token balances.