CVE-2018-13681 in SOSCoin
Summary
by MITRE
The mintToken function of a smart contract implementation for SOSCoin, 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-2018-13681 resides within the mintToken function of SOSCoin smart contract implementation on the Ethereum blockchain. This represents a critical security flaw that directly impacts the contract's ability to maintain accurate token balances and overall financial integrity. The issue stems from improper input validation and arithmetic handling within the smart contract code, creating a scenario where the contract owner can manipulate user balances arbitrarily.
The technical implementation of this vulnerability manifests through an integer overflow condition that occurs during the token minting process. When the mintToken function executes, it fails to properly validate or constrain the input parameters that determine the token amount to be minted. This allows an attacker with contract ownership privileges to specify extremely large values that exceed the maximum representable integer limits within the smart contract's data types. The overflow condition results in unexpected behavior where the balance calculation wraps around to invalid values, enabling the contract owner to set any user's token balance to an arbitrary amount.
From an operational perspective, this vulnerability presents a severe threat to the security and trustworthiness of the SOSCoin ecosystem. The contract owner can manipulate token distributions to create unlimited balances for specific users, potentially leading to massive inflation of the token supply or manipulation of trading dynamics. This capability undermines the fundamental principles of blockchain-based token economics and can result in significant financial losses for legitimate users who hold or trade the affected tokens. The vulnerability's impact extends beyond simple balance manipulation as it can be leveraged to create artificial market conditions or execute other malicious activities that compromise the entire token economy.
The vulnerability aligns with CWE-190, which specifically addresses integer overflow and underflow conditions in software implementations. This classification indicates that the flaw represents a well-documented pattern of improper integer handling that has been consistently identified across various software domains. From an attacker's perspective, this vulnerability fits within the ATT&CK framework under the technique of privilege escalation and resource hijacking, where an attacker with legitimate ownership rights can abuse their privileges to manipulate system resources. The exploitation of this vulnerability requires only the contract owner's private key access, making it particularly dangerous as it can be executed without external dependencies or complex attack vectors.
Mitigation strategies for this vulnerability must focus on implementing proper input validation and integer boundary checks within the smart contract code. The mintToken function should incorporate comprehensive validation mechanisms that prevent the specification of values exceeding the maximum representable limits for the token balance data types. Additionally, developers should implement proper overflow protection mechanisms using libraries such as OpenZeppelin's SafeMath or similar arithmetic libraries that automatically detect and prevent overflow conditions. The contract should also include proper access control mechanisms to ensure that only authorized entities can execute mint operations, and all balance modifications should be subject to audit trails that can detect anomalous behavior patterns. Regular security audits and formal verification of smart contract code are essential practices to identify and remediate similar vulnerabilities before they can be exploited in production environments.