CVE-2018-13506 in SDR22
Summary
by MITRE
The mintToken function of a smart contract implementation for SDR22, 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 in CVE-2018-13506 represents a critical integer overflow flaw within the mintToken function of an Ethereum-based smart contract implementation for SDR22 tokens. This vulnerability stems from inadequate input validation and arithmetic overflow handling within the contract's 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 boundary checks, allowing for potential manipulation of the uint256 data type arithmetic operations. Such vulnerabilities are particularly dangerous in decentralized finance applications where token balances directly correlate to user assets and transactional rights within the blockchain ecosystem.
The technical implementation of this vulnerability aligns with CWE-190, which specifically addresses integer overflow and unsigned integer overflow conditions. The flaw occurs when the contract's mintToken function performs arithmetic operations on token balances without validating that the resulting values remain within the acceptable range of the uint256 data type. This creates an exploitable condition where an attacker with owner privileges can manipulate the token supply and user balances through controlled overflow conditions. The vulnerability's impact extends beyond simple balance manipulation as it fundamentally compromises the integrity of the token economy and user trust within the smart contract system.
From an operational perspective, this vulnerability exposes the entire SDR22 token ecosystem to potential exploitation by malicious actors who gain access to the contract owner account. The ability to set arbitrary user balances creates opportunities for financial manipulation, including the potential to generate unlimited tokens, manipulate market prices, or unfairly distribute tokens to specific addresses. The attack surface is particularly concerning given that smart contracts operate in a trustless environment where users must rely on the code's integrity. This vulnerability directly impacts the contract's core functionality and can lead to complete loss of user funds or token value destruction, representing a fundamental failure in the contract's access control and state management mechanisms.
Mitigation strategies for CVE-2018-13506 should focus on implementing comprehensive input validation and boundary checking within the mintToken function. The contract should utilize safe arithmetic operations with overflow checks, potentially leveraging solidity's built-in overflow protection mechanisms or implementing custom safe math libraries. Additionally, the contract owner should implement proper access control measures and consider using multi-signature wallets for critical operations to reduce the risk of unauthorized access. The vulnerability also highlights the importance of thorough smart contract auditing and formal verification processes, as recommended by industry standards such as those outlined in the NIST Cybersecurity Framework for blockchain security. Regular security assessments and code reviews should be conducted to identify and remediate similar vulnerabilities across the entire smart contract ecosystem.