CVE-2018-13609 in CSAToken
Summary
by MITRE
The mintToken function of a smart contract implementation for CSAToken, 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 CVE-2018-13609 vulnerability represents a critical integer overflow flaw within the mintToken function of CSAToken smart contract implementations on the Ethereum blockchain. This vulnerability stems from inadequate input validation and arithmetic operation handling within the token contract code, creating a scenario where the contract owner can manipulate user balances arbitrarily. The flaw manifests when the mintToken function processes token minting operations without proper overflow checks, allowing malicious actors with owner privileges to execute operations that exceed the maximum value representable by the underlying integer data type.
The technical exploitation of this vulnerability occurs through the manipulation of integer arithmetic operations within the smart contract's mintToken function. When the contract attempts to increment a user's balance or perform arithmetic operations on token quantities, the lack of overflow protection enables an attacker to cause the integer value to wrap around to an unexpected state. This wrapping behavior, commonly known as integer overflow, allows the attacker to set any user's balance to an arbitrary value, potentially including extremely large numbers that could disrupt the entire token economy. The vulnerability is particularly dangerous because it directly impacts the fundamental integrity of the token's accounting system and can be exploited to create unlimited tokens or manipulate user balances to achieve unauthorized access or financial gain.
From an operational perspective, this vulnerability creates severe security implications for any system relying on CSAToken or similar implementations. The ability for a contract owner to manipulate user balances undermines trust in the token system and can lead to significant financial losses for token holders. The impact extends beyond immediate financial damage to include potential system instability, as the manipulation of balances can affect other contract functions that depend on accurate token counts. Additionally, the vulnerability can compromise the entire token ecosystem by enabling attackers to manipulate token distributions, affect governance mechanisms, or create artificial scarcity through balance manipulation. The attack vector is particularly concerning because it requires only owner privileges, which are often centralized and potentially compromised in many token implementations.
The vulnerability aligns with CWE-190, which describes integer overflow and underflow conditions, and represents a classic example of improper integer handling in smart contract code. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation techniques where an attacker with owner access can leverage the flaw to gain broader control over the token economy. The attack can be categorized under T1068, which covers exploit for privilege escalation, and T1548.001, which covers abuse of cloud permissions, as the contract owner's privileges are typically managed through blockchain-based access controls. Mitigation strategies should focus on implementing comprehensive input validation, using safe arithmetic libraries such as OpenZeppelin's SafeMath, and conducting thorough code audits to identify similar integer overflow patterns. Additionally, developers should implement proper access controls and consider using formal verification methods to ensure mathematical correctness of arithmetic operations in smart contracts. The vulnerability also highlights the importance of following secure coding practices and adhering to established smart contract development standards to prevent similar issues in future implementations.