CVE-2018-13573 in TripPay
Summary
by MITRE
The mintToken function of a smart contract implementation for TripPay, 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 as CVE-2018-13573 resides within the mintToken function of TripPay smart contract implementation on the Ethereum blockchain. This critical flaw represents an integer overflow vulnerability that fundamentally compromises the contract's integrity and security model. The vulnerability allows the contract owner to manipulate user balances arbitrarily, creating a severe risk for all token holders and the overall ecosystem. The affected smart contract operates as a utility token within the TripPay platform, likely facilitating travel-related transactions and services for users.
The technical implementation of this vulnerability stems from improper input validation and arithmetic operations within the mintToken function. When processing token minting operations, the smart contract fails to properly validate or constrain integer values, allowing for overflow conditions that can be exploited by the contract owner. This flaw directly maps to CWE-190, which describes integer overflow conditions that can lead to unexpected behavior and security breaches. The vulnerability occurs when the contract attempts to increment user balances without proper boundary checks, enabling an attacker with owner privileges to manipulate the balance of any user account to arbitrary values. The overflow condition typically manifests when the mathematical operation exceeds the maximum value that can be represented by the underlying data type, causing the value to wrap around to zero or negative numbers.
The operational impact of this vulnerability extends far beyond simple balance manipulation, creating substantial risks for token holders and the platform's ecosystem. An attacker with owner privileges can increase any user's balance to extremely high values, potentially allowing for unlimited spending within the TripPay ecosystem. This capability could lead to market manipulation, unauthorized transactions, and complete compromise of the token's economic model. The vulnerability undermines the fundamental trust in the smart contract's integrity and can result in significant financial losses for users who hold TripPay tokens. Additionally, the exploitability of this vulnerability means that any user whose balance is manipulated could face immediate loss of funds or be unable to transact properly within the platform.
Mitigation strategies for this vulnerability require immediate action from contract owners and the broader community. The primary remediation involves implementing proper input validation and boundary checks within the mintToken function to prevent integer overflow conditions. Developers should employ safe arithmetic operations that include overflow detection mechanisms and validate all input parameters before processing. The solution should incorporate explicit checks to ensure that balance updates do not exceed reasonable limits and that no single user can accumulate more tokens than the contract's intended maximum. Security auditing should be conducted to identify and remediate similar vulnerabilities throughout the smart contract codebase. This vulnerability demonstrates the critical importance of proper integer handling in blockchain smart contracts and aligns with ATT&CK technique T1499.004, which covers network denial of service attacks through smart contract manipulation. Organizations should implement comprehensive testing protocols including formal verification and automated security scanning to prevent similar vulnerabilities from being introduced in future smart contract deployments. The incident underscores the necessity for robust security practices in blockchain development and the importance of adhering to established security frameworks and industry standards.