CVE-2018-13169 in Ethereum Cash Pro
Summary
by MITRE
The mintToken function of a smart contract implementation for Ethereum Cash Pro (ECP), 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 in CVE-2018-13169 represents a critical integer overflow flaw within the mintToken function of the Ethereum Cash Pro (ECP) smart contract implementation. This vulnerability stems from improper input validation and arithmetic handling within the contract's codebase, creating a pathway for malicious exploitation that directly impacts the token's integrity and user fund security. The flaw specifically manifests when the mintToken function processes token minting operations, allowing unauthorized manipulation of user balances through crafted input parameters that exceed the maximum value limits of the underlying integer data types.
The technical implementation of this vulnerability aligns with CWE-190, which specifically addresses integer overflow conditions where an integer value exceeds the maximum representable value for its data type. In the context of Ethereum smart contracts, this manifests when the mintToken function performs arithmetic operations without proper bounds checking or overflow protection mechanisms. When the contract attempts to increment a user's balance beyond the maximum value that can be stored in the designated integer variable, the value wraps around to zero or a negative value, creating an unpredictable state that can be exploited by the contract owner. This behavior violates fundamental security principles of smart contract development and creates a scenario where the owner can manipulate user balances to arbitrary values, effectively allowing for unauthorized fund transfers or account manipulation.
The operational impact of this vulnerability extends beyond simple balance manipulation to encompass potential financial loss and system compromise within the Ethereum ecosystem. An attacker with access to the contract owner privileges can exploit this vulnerability to increase any user's balance to extremely high values, potentially causing the total supply to exceed expected limits or creating artificial scarcity. This vulnerability also enables the possibility of account manipulation that could disrupt normal token operations, create denial of service conditions, or allow for unauthorized minting of tokens beyond the intended supply limits. The implications are particularly severe in decentralized finance applications where such vulnerabilities can lead to significant financial losses for users and undermine trust in the entire token ecosystem.
Mitigation strategies for CVE-2018-13169 require immediate implementation of comprehensive code review and security auditing practices within smart contract development workflows. The primary remediation involves implementing proper integer overflow protection mechanisms such as using SafeMath libraries or similar arithmetic libraries that automatically check for overflow conditions before performing operations. Additionally, developers should enforce strict input validation and bounds checking within all functions that manipulate token balances or perform arithmetic operations. The vulnerability also highlights the importance of following established security frameworks and best practices such as those outlined in the OpenZeppelin security guidelines, which recommend the use of verified libraries and comprehensive testing procedures. Organizations should also implement regular security audits and consider employing formal verification techniques to identify similar vulnerabilities before deployment, as this type of flaw can have cascading effects on user trust and financial stability within the broader cryptocurrency ecosystem.