CVE-2018-13709 in Tube
Summary
by MITRE
The mintToken function of a smart contract implementation for Tube, 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-2018-13709 resides within the mintToken function of a smart contract implementation for Tube, an Ethereum-based token. This flaw represents a critical integer overflow vulnerability that fundamentally compromises the contract's integrity and security model. The vulnerability allows the contract owner to manipulate user balances arbitrarily, creating a scenario where malicious actors can potentially drain or manipulate token distributions across the network. Such a flaw directly undermines the core principles of blockchain security and trustless computation that smart contracts are designed to provide.
The technical implementation of this vulnerability stems from improper input validation and arithmetic operations within the mintToken function. When processing token minting operations, the contract fails to properly validate or constrain integer values, allowing for overflow conditions to occur. This vulnerability maps directly to CWE-190, which describes integer overflow conditions that can result in unexpected behavior and security breaches. The flaw occurs because the contract does not implement proper bounds checking or overflow detection mechanisms before performing arithmetic operations on token balances. When an attacker exploits this vulnerability, they can manipulate the mintToken function to set any user's balance to an arbitrary value, potentially creating infinite tokens or setting balances to zero.
The operational impact of this vulnerability extends far beyond simple balance manipulation, creating cascading security risks throughout the Ethereum ecosystem. The contract owner can effectively control the entire token distribution mechanism, allowing them to create unlimited tokens or manipulate user holdings to their advantage. This represents a severe compromise of the decentralized trust model that blockchain technology promises, as it allows a single entity to override the normal rules of token economics. The vulnerability could enable financial fraud, market manipulation, and potentially compromise the entire token economy built around the Tube contract. Attackers could exploit this to drain token reserves, manipulate market prices, or gain unfair advantages in token-based applications.
Mitigation strategies for CVE-2018-13709 require immediate implementation of comprehensive input validation and arithmetic overflow protection mechanisms. The smart contract should implement proper bounds checking before any arithmetic operations, utilizing safe math libraries that prevent integer overflow conditions. Additionally, the contract owner should implement proper access controls and audit trails to monitor any mintToken function calls. The solution aligns with ATT&CK technique T1078 which addresses legitimate credentials and access control in network environments, emphasizing the need for proper privilege management. Organizations should also consider implementing formal verification methods and thorough security audits before deploying any smart contract to production environments. The vulnerability demonstrates the critical importance of secure coding practices in blockchain development, where a single flaw can compromise the entire system's integrity and user trust.