CVE-2018-13486 in HELP
Summary
by MITRE
The mintToken function of a smart contract implementation for HELP, 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-2018-13486 resides within the mintToken function of an Ethereum-based smart contract implementation for the HELP token, representing a critical integer overflow flaw that fundamentally compromises the contract's integrity and security model. This vulnerability classifies under CWE-190, which specifically addresses integer overflow and underflow conditions in software implementations. The flaw manifests when the mintToken function processes token minting operations without proper validation of arithmetic operations, creating a scenario where an attacker can manipulate the balance of any user account within the contract.
The technical exploitation of this vulnerability occurs through the manipulation of integer arithmetic within the smart contract's mintToken function, where the contract fails to validate whether the resulting balance would exceed the maximum value that can be represented by the underlying data type. This allows the contract owner to execute a malicious transaction that deliberately causes an integer overflow, effectively bypassing normal balance restrictions and enabling the arbitrary assignment of token balances to any user address. The vulnerability exists because the contract implementation does not employ overflow detection mechanisms or use safe arithmetic libraries that would prevent such conditions from occurring during mathematical operations.
The operational impact of this vulnerability is severe and far-reaching, as it grants the contract owner unlimited control over user token balances and potentially enables the creation of unlimited supply tokens. An attacker with access to the contract owner's private key can manipulate user balances to create artificial wealth distribution or even drain funds from other users' accounts. This vulnerability directly affects the fundamental principles of blockchain tokenomics and trustless systems, as it undermines the immutability and predictability that users expect from smart contracts. The vulnerability also creates potential for financial loss and market manipulation, as the affected token's value could be artificially inflated or deflated through malicious balance manipulation.
Mitigation strategies for CVE-2018-13486 require immediate implementation of proper integer overflow protection mechanisms within the smart contract code. The recommended approach involves incorporating overflow detection checks using modern Solidity versions that include built-in overflow protection or employing libraries such as OpenZeppelin's SafeMath library to prevent arithmetic operations from exceeding their data type limits. Additionally, comprehensive code auditing and formal verification processes should be implemented to identify similar vulnerabilities across the entire smart contract ecosystem. The fix should also include proper access control mechanisms to ensure that only authorized entities can execute mintToken functions, combined with transaction logging and monitoring to detect anomalous balance manipulations. This vulnerability aligns with ATT&CK technique T1548.001, which covers privilege escalation through code injection, as it allows unauthorized elevation of privileges through contract manipulation. The remediation process must also consider the broader implications for token governance and user trust, as such vulnerabilities can severely damage the reputation of token projects and create legal and regulatory concerns in jurisdictions that may view such flaws as security breaches or financial fraud.