CVE-2018-13753 in DeWeiSecurityServiceToken
Summary
by MITRE
The mintToken function of a smart contract implementation for DeWeiSecurityServiceToken, 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 • 03/03/2020
The mintToken function in the DeWeiSecurityServiceToken smart contract implementation presents a critical integer overflow vulnerability that fundamentally compromises the token's integrity and security model. This vulnerability exists within the Ethereum blockchain ecosystem where smart contracts execute with absolute precision and immutable logic. The flaw allows the contract owner to manipulate token balances through improper handling of integer arithmetic operations, specifically when dealing with large values that exceed the maximum representable integer limits. Such vulnerabilities represent a direct threat to the decentralized finance landscape where trustless execution depends on mathematical correctness and predictable behavior.
The technical nature of this vulnerability stems from the absence of proper overflow checks in the mintToken function implementation. When the contract attempts to increment token balances or perform arithmetic operations with large values, the integer overflow occurs naturally within the Ethereum Virtual Machine's computational framework. This behavior can be exploited by the contract owner to manipulate account balances to arbitrary values, effectively allowing for unlimited token generation or redistribution without proper authorization. The vulnerability aligns with CWE-190, Integer Overflow or Wraparound, which specifically addresses improper handling of integer arithmetic operations that can result in unexpected behavior. The issue manifests as a complete breakdown in the token's supply control mechanism, where the owner can bypass normal minting restrictions and manipulate the total supply or individual account balances at will.
Operationally, this vulnerability creates a severe risk for token holders and investors who rely on the integrity of the smart contract's balance management system. The contract owner can effectively drain funds from other users by setting their balances to zero or manipulate the distribution of tokens for personal gain. This exploitation capability undermines the fundamental principles of blockchain-based tokenomics where transparency and immutability are core requirements. The impact extends beyond individual account manipulation to potentially destabilize the entire token economy, as the owner could artificially inflate or deflate token values through controlled balance manipulation. This vulnerability directly conflicts with the principles outlined in the Ethereum security model where contract owners should not have unchecked power over token distribution and supply management, representing a critical failure in the access control and validation mechanisms.
Mitigation strategies for this vulnerability require immediate implementation of proper integer overflow protection mechanisms within the smart contract code. The recommended approach involves incorporating explicit overflow checks using modern Solidity features such as SafeMath libraries or compiler versions that enable automatic overflow protection. Additionally, implementing proper access controls and audit mechanisms can help prevent unauthorized exploitation of the owner privileges. The vulnerability demonstrates the importance of adhering to established security best practices in smart contract development and highlights the necessity of comprehensive code review processes. Organizations should also consider implementing regular security audits and formal verification techniques to identify similar issues before deployment. This case study emphasizes the critical need for developers to understand the underlying computational models of blockchain platforms and implement defensive programming practices to prevent such fundamental security flaws from compromising entire token ecosystems. The vulnerability serves as a reminder that even seemingly simple functions can introduce catastrophic security risks when proper mathematical and logical safeguards are not implemented.