CVE-2018-13652 in TheGoDigital
Summary
by MITRE
The mintToken function of a smart contract implementation for TheGoDigital, 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 as CVE-2018-13652 represents a critical integer overflow flaw within the mintToken function of TheGoDigital Ethereum token smart contract implementation. This vulnerability stems from improper input validation and arithmetic handling within the contract's codebase, creating a scenario where the contract owner can manipulate user balances arbitrarily. The flaw exists in the token's minting mechanism, which is designed to create new tokens and distribute them to users, but due to the overflow condition, it becomes a weapon for unauthorized balance manipulation.
The technical exploitation of this vulnerability occurs when the mintToken function processes token minting operations without proper bounds checking or overflow protection mechanisms. When an integer overflow occurs, the mathematical operation exceeds the maximum value that can be represented by the data type, causing the value to wrap around to zero or a negative number. In the context of token balances, this creates a situation where the owner can set any user's balance to an arbitrary value, effectively allowing unlimited token generation or balance manipulation. This type of vulnerability is categorized under CWE-190 as Integer Overflow or Wraparound, which represents a fundamental weakness in arithmetic operations within software systems.
The operational impact of this vulnerability extends far beyond simple balance manipulation, as it fundamentally compromises the integrity and security of the entire token ecosystem. An attacker with access to the contract owner account can create unlimited tokens, manipulate user balances to their advantage, or potentially drain funds from other users. The vulnerability affects all users of the TheGoDigital token since the owner can set any user's balance to any value, including zero or extremely high amounts. This creates a complete breakdown of the token's economic model and trust mechanism, as users cannot rely on accurate balance reporting or fair token distribution. The vulnerability also impacts the token's utility within decentralized applications and exchanges that depend on accurate balance information.
Mitigation strategies for this vulnerability require immediate implementation of proper integer overflow protection mechanisms within the smart contract code. The most effective approach involves using established safe math libraries or implementing explicit bounds checking before any arithmetic operations in the mintToken function. Additionally, the contract should enforce proper access controls and audit logging to track all minting operations. The implementation should follow security best practices such as those outlined in the OpenZeppelin safe math libraries and adhere to the principles of defensive programming. Regular security audits and formal verification of smart contracts should be conducted to prevent similar vulnerabilities from being introduced in future deployments. This vulnerability highlights the critical importance of rigorous code review processes and adherence to established security frameworks in blockchain development environments. The ATT&CK framework categorizes this as a privilege escalation technique where an attacker leverages existing administrative privileges to manipulate system state, demonstrating how internal contract ownership can be weaponized for unauthorized operations.