CVE-2018-13181 in Troo
Summary
by MITRE
The mintToken function of a smart contract implementation for Troo, 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 as CVE-2018-13181 resides within the mintToken function of a smart contract implementation for Troo, an Ethereum-based token. This flaw represents a critical integer overflow condition that fundamentally compromises the contract's integrity and security model. The vulnerability stems from improper input validation and arithmetic handling within the mintToken function, which allows unauthorized manipulation of user balances through maliciously crafted parameters. The flaw enables an attacker with access to the contract owner privileges to arbitrarily set any user's token balance to any desired value, effectively creating unlimited tokens or manipulating existing balances.
This vulnerability directly maps to CWE-190, Integer Overflow or Wraparound, which describes a condition where an integer value exceeds its maximum representable value and wraps around to a smaller value. The operational impact of this vulnerability extends beyond simple balance manipulation as it fundamentally undermines the trustless nature of blockchain transactions and token economics. An attacker could potentially drain the contract's token supply, manipulate market prices, or create artificial scarcity by setting specific user balances to extremely high values. The vulnerability exists at the core of the token's minting mechanism, which is designed to create new tokens and distribute them to users, making it a critical point of failure in the contract's security architecture.
The exploitation of this vulnerability aligns with several tactics described in the MITRE ATT&CK framework, particularly those related to privilege escalation and resource hijacking. Attackers could leverage this flaw to gain unauthorized control over token distributions and potentially manipulate the entire token economy. The vulnerability also relates to the broader category of smart contract security failures that can lead to financial loss and system compromise. From a blockchain security perspective, this represents a fundamental flaw in the contract's access control and input validation mechanisms, as it allows for arbitrary balance modification without proper authorization checks. The integer overflow occurs during the minting process when the contract fails to validate that the arithmetic operations will not exceed the maximum value that can be stored in the data type, creating a predictable path for exploitation.
Mitigation strategies for this vulnerability require immediate patching of the smart contract code to implement proper integer overflow protections through bounds checking and validation mechanisms. The contract should enforce strict input validation on all parameters passed to the mintToken function, including implementing overflow detection before any arithmetic operations. Additionally, the contract should utilize established secure coding practices such as using libraries like OpenZeppelin's SafeMath or similar overflow protection mechanisms. Access controls should be reviewed and strengthened to ensure that only authorized entities can invoke mint operations, and all mintToken calls should be logged for audit purposes. The contract should also implement comprehensive testing including unit tests and formal verification to prevent similar issues in future deployments. Organizations should consider implementing multi-signature wallets for contract ownership and regular security audits to identify and remediate such vulnerabilities before they can be exploited in production environments.