CVE-2018-13666 in EristicaICO
Summary
by MITRE
The mintToken function of a smart contract implementation for EristicaICO, 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 in CVE-2018-13666 represents a critical integer overflow flaw within the mintToken function of the EristicaICO Ethereum smart contract implementation. This type of vulnerability falls under CWE-190, which specifically addresses integer overflow and underflow conditions in software systems. The flaw occurs when the smart contract processes token minting operations, creating a scenario where mathematical operations exceed the maximum representable value for the data type being used. In the context of Ethereum smart contracts, this typically involves uint256 or similar unsigned integer types that can wrap around when exceeding their maximum capacity.
The technical exploitation of this vulnerability allows the contract owner to manipulate token balances through a carefully crafted sequence of operations that leverage the integer overflow condition. When the mintToken function executes, it performs arithmetic operations that can cause the underlying integer value to wrap around from its maximum value back to zero or a negative value, depending on the specific implementation. This overflow condition creates a path where the owner can effectively bypass normal token issuance restrictions and directly manipulate user balances to arbitrary values. The vulnerability is particularly dangerous because it operates within the core token management functionality, giving the owner unprecedented control over the token distribution mechanism.
The operational impact of this vulnerability extends beyond simple balance manipulation to potentially compromise the entire token economy and user trust in the EristicaICO platform. An attacker with owner privileges could inflate their own token holdings, manipulate market dynamics, or even create artificial scarcity by setting other users' balances to zero. This type of vulnerability directly violates fundamental security principles of decentralized finance applications and can lead to significant financial losses for token holders. The attack vector is particularly concerning because it does not require external interaction or complex multi-step processes, making it relatively straightforward for malicious actors to exploit.
Mitigation strategies for this vulnerability must address the root cause through proper input validation and arithmetic operation handling within the smart contract code. Developers should implement bounds checking mechanisms before any arithmetic operations that could potentially overflow, ensuring that values remain within acceptable ranges. The use of established safe math libraries such as OpenZeppelin's SafeMath implementation provides a robust framework for preventing integer overflows in Ethereum smart contracts. Additionally, comprehensive code review processes should include specific checks for integer overflow conditions, particularly in functions that handle token creation, transfer, and balance manipulation. Regular security audits and formal verification techniques should be employed to identify similar vulnerabilities across the entire smart contract ecosystem. The vulnerability also highlights the importance of proper access control and the principle of least privilege, ensuring that contract owners do not have excessive capabilities that could be exploited to manipulate the token economy. This issue aligns with ATT&CK technique T1548.001, which involves privilege escalation through manipulation of system processes, and demonstrates the critical need for robust security practices in blockchain-based applications to maintain the integrity of decentralized financial systems.