CVE-2018-13602 in MiningToken
Summary
by MITRE
The mint function of a smart contract implementation for MiningToken, 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 as CVE-2018-13602 resides within the MiningToken smart contract implementation on the Ethereum blockchain platform. This critical flaw manifests in the mint function which is designed to create new tokens and distribute them to users. The integer overflow vulnerability represents a fundamental weakness in the contract's arithmetic handling mechanisms, specifically when dealing with large numerical values that exceed the maximum capacity of the underlying data types. Such overflow conditions can occur when the contract attempts to increment token balances beyond the maximum value that can be represented by the integer storage type, typically resulting in unexpected wraparound behavior where the value resets to zero or a negative number.
The technical exploitation of this vulnerability stems from the lack of proper input validation and overflow checks within the mint function implementation. When the contract owner invokes the mint function, they can manipulate the token supply calculation in such a way that the arithmetic operations result in integer overflow conditions. This allows the malicious actor to bypass normal token distribution mechanisms and directly manipulate user balances to arbitrary values. The vulnerability directly maps to CWE-190, which specifically addresses integer overflow and underflow conditions in software implementations. The underlying issue occurs because the smart contract code does not perform adequate bounds checking or use safe arithmetic libraries that could prevent such overflow scenarios from occurring during token creation and distribution processes.
The operational impact of this vulnerability extends beyond simple financial manipulation and represents a severe threat to the integrity and security of the entire token ecosystem. An attacker with contract ownership privileges can arbitrarily inflate or deflate user balances, potentially leading to massive financial losses for token holders and undermining the fundamental trust in the token's value and distribution mechanism. The vulnerability enables not only unauthorized balance manipulation but also creates potential for more sophisticated attacks such as reentrancy exploits or other contract manipulation techniques that could compound the initial compromise. This type of vulnerability directly aligns with attack patterns described in the ATT&CK framework under the T1059.001 technique for command and control through smart contract manipulation, where attackers leverage code execution vulnerabilities to gain unauthorized access to system resources and manipulate underlying data structures.
Mitigation strategies for this vulnerability require immediate implementation of proper integer overflow protection mechanisms within the smart contract codebase. The most effective approach involves utilizing safe arithmetic libraries such as OpenZeppelin's SafeMath or similar implementations that provide checked arithmetic operations to prevent overflow conditions. Additionally, comprehensive input validation should be implemented to verify that all numerical inputs to the mint function fall within acceptable ranges and that proper bounds checking is performed before any arithmetic operations occur. The contract owner should also implement proper access controls and audit logging to monitor any suspicious mint operations that could indicate exploitation attempts. Regular security audits and formal verification of smart contract code should become standard practice to identify and remediate similar vulnerabilities before they can be exploited in production environments. Organizations should also consider implementing multi-signature wallets for contract ownership and establish robust governance procedures to minimize the risk of unauthorized access to privileged contract functions that could enable exploitation of such integer overflow vulnerabilities.