CVE-2018-13629 in CrimsonShilling
Summary
by MITRE
The mintToken function of a smart contract implementation for CrimsonShilling, 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-2018-13629 represents a critical integer overflow flaw within the mintToken function of the CrimsonShilling Ethereum token smart contract implementation. This vulnerability resides in the core token functionality that governs the creation and distribution of new tokens within the blockchain ecosystem. The flaw specifically manifests when the mintToken function processes token minting operations, creating conditions where arithmetic operations can exceed the maximum value that can be represented by the underlying data type, leading to unexpected behavior in the token balance calculations. The integer overflow vulnerability directly impacts the contract's ability to maintain accurate and secure token accounting, potentially allowing malicious actors to manipulate token distributions and balances within the system.
The technical nature of this vulnerability aligns with CWE-190, which categorizes integer overflow and underflow conditions as a fundamental security weakness in software implementations. In the context of Ethereum smart contracts, this vulnerability operates at the level of the Ethereum Virtual Machine where integer operations are performed using fixed-size data types. When the mintToken function executes and attempts to increment token balances, the arithmetic operation can wrap around to zero or negative values due to the overflow condition, creating a scenario where the contract owner can manipulate user balances arbitrarily. This flaw is particularly dangerous because it allows for unauthorized balance manipulation without proper authorization mechanisms, effectively bypassing the normal token distribution and ownership controls that should govern such operations.
The operational impact of this vulnerability extends beyond simple balance manipulation to encompass significant security implications for the entire token ecosystem. An attacker with access to the contract owner privileges can exploit this vulnerability to create unlimited token balances for specific addresses, potentially leading to massive dilution of token value or complete control over token distribution. This vulnerability undermines the fundamental principles of blockchain tokenomics where transparent and secure balance management is essential for maintaining trust and integrity within the network. The impact on user confidence and token value can be severe, as the vulnerability enables unauthorized minting of tokens that could be used for fraudulent activities or market manipulation. Additionally, the vulnerability affects the contract's ability to maintain proper accounting records, potentially causing cascading failures in systems that depend on accurate token balance information.
Mitigation strategies for this vulnerability require immediate implementation of proper input validation and arithmetic boundary checks within the mintToken function. The recommended approach involves implementing explicit overflow checks before any arithmetic operations that could potentially exceed data type limits, utilizing Solidity's built-in overflow protection mechanisms or external libraries designed to prevent such conditions. The contract should enforce strict validation of input parameters to ensure that token minting operations remain within acceptable numerical ranges. Security audits and formal verification processes should be conducted to identify similar vulnerabilities across the entire smart contract codebase. Organizations should also implement proper access controls and multi-signature requirements for contract owner privileges to limit the potential impact of such vulnerabilities. The remediation process must include thorough testing of all token minting and balance update functions to ensure that no similar integer overflow conditions exist in other parts of the contract implementation, as outlined in the ATT&CK framework's approach to identifying and mitigating software vulnerabilities through systematic security assessments and defensive programming practices.