CVE-2018-13658 in TheGoDgital
Summary
by MITRE
The mintToken function of a smart contract implementation for TheGoDgital, 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-2018-13658 represents a critical integer overflow flaw within the mintToken function of TheGoDgital Ethereum token smart contract implementation. This security weakness stems from improper input validation and arithmetic handling within the smart contract code, specifically affecting the token's ability to manage user balances. The flaw allows the contract owner to manipulate token balances beyond normal operational parameters, creating a significant risk for token holders and the overall ecosystem.
The technical nature of this vulnerability aligns with CWE-190, which describes integer overflow conditions where an integer value exceeds the maximum representable value for its data type. In the context of Ethereum smart contracts, this occurs when the mintToken function processes user inputs without adequate bounds checking or overflow protection mechanisms. The contract owner can exploit this by calculating specific values that cause the internal arithmetic operations to wrap around, effectively allowing arbitrary balance manipulation. This type of vulnerability is particularly dangerous in decentralized applications where trust assumptions are fundamental to the system's operation.
The operational impact of this vulnerability extends beyond simple balance manipulation to potentially compromise the entire token economy and user trust. An attacker with owner privileges could inflate user balances to create artificial scarcity, manipulate token prices, or even drain liquidity from related smart contracts. The vulnerability also represents a significant threat to the token's integrity since it allows for unauthorized balance modifications that could be used to create additional tokens or manipulate market dynamics. This flaw undermines the core principles of blockchain technology, including transparency and immutability, as the contract's state can be altered maliciously by its designated owner.
Mitigation strategies for this vulnerability require immediate implementation of proper integer overflow protection mechanisms within the smart contract code. Developers should employ established patterns such as using safe math libraries, implementing explicit bounds checking, and utilizing require statements to validate input parameters before processing. The contract should also implement proper access control measures to limit the owner's privileges and establish clear auditing procedures. Additionally, regular security audits and formal verification processes should be integrated into the development lifecycle to identify similar vulnerabilities before deployment. The ATT&CK framework categorizes this as a privilege escalation technique where an attacker with elevated privileges can manipulate system state, making this vulnerability particularly concerning for token governance models where owner control is central to operations.