CVE-2018-13164 in EPPCOIN
Summary
by MITRE
The mintToken function of a smart contract implementation for EPPCOIN (EPP), 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 • 02/25/2020
The vulnerability identified as CVE-2018-13164 resides within the mintToken function of EPPCOIN (EPP) smart contract implementation on the Ethereum blockchain. This represents a critical security flaw that directly impacts the contract's integrity and the underlying token economics. The issue manifests as an integer overflow condition that occurs when the contract attempts to increment token balances during the minting process, creating a scenario where the owner can manipulate user balances arbitrarily.
The technical exploitation of this vulnerability stems from improper input validation and lack of overflow checking within the mintToken function. When the contract processes token minting operations, it fails to validate that the resulting balance values remain within acceptable integer limits. This allows an attacker with owner privileges to craft transactions that cause integer overflow conditions, effectively bypassing normal balance constraints. The vulnerability is classified under CWE-190 as an integer overflow, which specifically relates to the lack of proper validation when performing arithmetic operations that could result in values exceeding the maximum representable integer.
From an operational perspective, this vulnerability creates severe implications for the EPP token ecosystem and its users. The ability for the contract owner to set arbitrary user balances undermines the fundamental principles of blockchain token economics and trustless systems. Users may experience unexpected balance changes, potentially leading to unauthorized transfers, manipulation of token distributions, or complete loss of funds. The vulnerability also compromises the contract's immutability and transparency guarantees that are core to blockchain technology, as the owner can manipulate the system in ways that are not immediately detectable by other participants.
The attack surface for this vulnerability extends beyond simple balance manipulation to encompass potential financial losses and systemic risks within the token economy. An attacker could theoretically inflate balances of specific addresses to create artificial market conditions or manipulate governance voting power. This vulnerability aligns with ATT&CK technique T1548.001 which involves privilege escalation through manipulation of system processes. The impact is particularly severe because it allows for direct financial manipulation without requiring complex multi-step attacks, making it highly exploitable.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security improvements. The primary fix involves implementing proper integer overflow checks using safe math libraries or explicit validation before arithmetic operations. Smart contract developers should employ libraries such as OpenZeppelin's SafeMath or similar implementations that automatically handle overflow conditions. Additionally, comprehensive code review processes should be implemented to identify similar vulnerabilities in other arithmetic operations. The contract should also include proper access controls and logging mechanisms to detect unauthorized balance modifications. Regular security audits and formal verification techniques should be employed to prevent similar issues in future implementations, ensuring that the token maintains its integrity and user trust.