CVE-2018-13610 in MedicayunLink
Summary
by MITRE
The mintToken function of a smart contract implementation for MedicayunLink, 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-2018-13610 represents a critical integer overflow flaw within the mintToken function of the MedicayunLink Ethereum token smart contract implementation. This vulnerability stems from inadequate input validation and arithmetic overflow handling within the smart contract's code logic. The flaw allows the contract owner to manipulate token balances of arbitrary users by exploiting the overflow condition, effectively enabling unauthorized balance manipulation that can compromise the integrity of the entire token ecosystem.
The technical implementation of this vulnerability falls under CWE-190, Integer Overflow or Wraparound, which occurs when a program performs arithmetic operations on integer values that exceed the maximum representable value for the data type. In the context of Ethereum smart contracts, this manifests when the mintToken function fails to properly validate or constrain the amount parameter before performing addition operations that could result in overflow conditions. The vulnerability is particularly dangerous because it operates within the contract owner privileges, allowing malicious or compromised owners to manipulate token distributions and potentially drain liquidity from the system.
The operational impact of this vulnerability extends beyond simple balance manipulation to encompass potential financial losses, market manipulation, and systemic risks within the token economy. An attacker with owner privileges can artificially inflate or deflate user balances, creating artificial scarcity or abundance that could be exploited for financial gain. This vulnerability directly impacts the principle of fair token distribution and can lead to concentration of tokens among malicious actors, undermining the trust and security assumptions that users place in the smart contract system. The consequences include potential loss of user funds, erosion of confidence in the token, and possible regulatory scrutiny for failing to implement proper security controls.
Mitigation strategies for this vulnerability require immediate code remediation through proper input validation and overflow checking mechanisms. The smart contract should implement explicit bounds checking on all integer parameters before arithmetic operations, utilize safe math libraries that automatically handle overflow conditions, and employ proper access control measures to limit owner privileges. Additionally, comprehensive code auditing and formal verification processes should be implemented to identify similar vulnerabilities across the entire smart contract codebase. This vulnerability demonstrates the critical importance of adhering to security best practices in blockchain development and aligns with ATT&CK technique T1059.006 for Smart Contract Vulnerability Exploitation, emphasizing the need for robust input validation and proper error handling in decentralized applications. The remediation process should also include thorough testing with edge cases and integration of automated security scanning tools to prevent similar issues in future deployments.