CVE-2018-13496 in RajTestICO
Summary
by MITRE
The mintToken function of a smart contract implementation for RajTestICO, 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.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 02/27/2020
The vulnerability identified in CVE-2018-13496 represents a critical integer overflow flaw within the mintToken function of the RajTestICO Ethereum token smart contract implementation. This vulnerability stems from improper input validation and arithmetic operations that fail to account for the maximum limits of integer data types within the Ethereum Virtual Machine. The flaw allows the contract owner to manipulate token balances in ways that could lead to significant financial losses and system compromise. The vulnerability directly maps to CWE-190, which specifically addresses integer overflow conditions, and falls under the broader category of CWE-682, involving incorrect use of arithmetic operations.
The technical execution of this vulnerability occurs through the mintToken function where the smart contract fails to validate whether the token amount being minted would cause an integer overflow. When an attacker or the contract owner invokes this function with carefully crafted parameters, the arithmetic operation exceeds the maximum value that can be represented by the integer data type, causing the value to wrap around to zero or a negative value. This overflow condition enables the owner to set arbitrary user balances to any desired value, including potentially infinite amounts. The Ethereum blockchain environment exacerbates this issue because smart contracts execute with complete trust in their code, making such flaws particularly dangerous as they cannot be easily reversed once deployed.
The operational impact of this vulnerability extends beyond simple financial manipulation to encompass potential system compromise and loss of user trust. An attacker with owner privileges could inflate their own token holdings or manipulate other users' balances to create artificial scarcity or manipulate token prices. This could lead to significant financial losses for token holders and undermine the entire token ecosystem. The vulnerability also creates opportunities for gaming the token economy, potentially leading to market manipulation and loss of confidence in the platform. From an ATT&CK framework perspective, this vulnerability represents a privilege escalation technique that allows an attacker to gain unauthorized control over user assets, falling under the privilege escalation category with potential for data manipulation and financial theft.
Mitigation strategies for CVE-2018-13496 require immediate implementation of proper input validation and overflow protection mechanisms within the smart contract code. Developers should employ explicit bounds checking and use libraries that provide safe arithmetic operations such as OpenZeppelin's SafeMath library to prevent integer overflows. The contract owner should also implement proper access controls and audit procedures to prevent unauthorized access to privileged functions. Additionally, comprehensive testing including fuzz testing and formal verification should be conducted before deployment to identify similar vulnerabilities. The remediation process must include thorough code review practices and adherence to established smart contract security standards to prevent recurrence of such issues in future implementations. Regular security audits and continuous monitoring of deployed contracts are essential to maintain the integrity of the token ecosystem and protect user assets from similar vulnerabilities.