CVE-2018-13589 in MooAdvToken
Summary
by MITRE
The mintToken function of a smart contract implementation for MooAdvToken, 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.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 02/27/2020
The vulnerability identified in CVE-2018-13589 represents a critical integer overflow flaw within the mintToken function of the MooAdvToken smart contract deployed on the Ethereum blockchain. 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 by setting them to arbitrary values through malicious calls to the mintToken function, effectively bypassing normal token distribution mechanisms.
The technical implementation of this vulnerability manifests in the smart contract's inability to properly validate or constrain integer values during arithmetic operations within the mintToken function. When the owner invokes this function with specific parameters, the underlying integer overflow condition enables the manipulation of user balances beyond normal operational boundaries. This creates a scenario where the contract owner can effectively mint unlimited tokens for themselves or other users, potentially leading to complete control over the token supply and user account balances. The vulnerability directly maps to CWE-190, which describes integer overflow and underflow conditions, and represents a classic example of insufficient input validation in smart contract development.
The operational impact of this vulnerability extends beyond simple balance manipulation to encompass potential financial loss and contract integrity compromise. An attacker with owner privileges can exploit this flaw to inflate their own token holdings while simultaneously affecting other users' balances, creating a scenario where the token economy becomes fundamentally compromised. The vulnerability undermines the core principles of decentralized finance by allowing centralized control over token distribution and user account management. This represents a significant threat to user funds and contract security, as the attacker can essentially create unlimited tokens and manipulate the token economy to their advantage.
Mitigation strategies for this vulnerability require immediate contract upgrades to implement proper integer overflow protection mechanisms. Developers should employ explicit bounds checking and use secure arithmetic operations that prevent overflow conditions during token minting processes. The implementation of require statements and validation checks before any arithmetic operations within the mintToken function would prevent malicious input from causing unintended behavior. Additionally, regular security audits and formal verification of smart contract code should be implemented to identify similar vulnerabilities before deployment. This vulnerability demonstrates the critical importance of following secure coding practices in blockchain development and aligns with ATT&CK technique T1587 for developing capabilities that exploit smart contract vulnerabilities. The fix should include comprehensive testing procedures to ensure that all integer operations within the contract properly handle edge cases and maintain the integrity of the token economy.