CVE-2018-13590 in SIPCOIN
Summary
by MITRE
The mintToken function of a smart contract implementation for SIPCOIN, 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 • 02/27/2020
The vulnerability identified in CVE-2018-13590 represents a critical integer overflow flaw within the mintToken function of the SIPCOIN Ethereum token smart contract implementation. This vulnerability falls under the CWE-190 category of integer overflow and under the ATT&CK technique T1210 for exploitation of remote services. The flaw exists in the contract's logic where the mintToken function fails to properly validate or constrain integer values during balance calculations, creating a scenario where the owner can manipulate token balances without proper authorization.
The technical implementation of this vulnerability stems from improper input validation within the smart contract's mintToken function. When the contract owner invokes this function, they can specify arbitrary values for token minting operations, but due to the lack of overflow checks, the system allows for values that exceed the maximum limits of the integer data types used. This creates a condition where the arithmetic operations wrap around to unintended values, effectively allowing the owner to bypass normal token distribution constraints and directly set user balances to any desired amount. The vulnerability is particularly dangerous because it operates at the core of the token's distribution mechanism, fundamentally compromising the integrity of the token economy.
The operational impact of this vulnerability extends far beyond simple balance manipulation, as it provides the contract owner with unprecedented control over the token ecosystem. An attacker who gains ownership of the SIPCOIN contract can instantly create unlimited token supply for specific users, potentially leading to massive dilution of token value or enabling fraudulent activities such as artificial inflation of holdings. This vulnerability undermines the fundamental principles of decentralized finance and blockchain security by allowing central control over token distribution, effectively nullifying the trustless nature of the smart contract system. The implications are severe for token holders who may find their holdings devalued or manipulated without their knowledge or consent.
Mitigation strategies for this vulnerability require immediate contract upgrades with proper integer overflow protections and comprehensive input validation mechanisms. The recommended approach involves implementing explicit bounds checking and using safe arithmetic operations that prevent overflow conditions. Additionally, contract ownership should be transferred to a multi-signature wallet or decentralized governance system to prevent single points of failure. The fix should incorporate proper access controls and audit trails to ensure that all balance modifications are properly logged and validated. Organizations should also implement regular smart contract security audits and consider using formal verification methods to identify similar vulnerabilities before deployment. This vulnerability serves as a critical reminder of the importance of rigorous security testing in blockchain applications and the necessity of following established security frameworks and best practices for smart contract development.