CVE-2018-13729 in JPMD100B
Summary
by MITRE
The mintToken function of a smart contract implementation for JPMD100B, 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 in CVE-2018-13729 represents a critical integer overflow flaw within the mintToken function of the JPMD100B Ethereum token smart contract implementation. This vulnerability stems from improper input validation and arithmetic operations that fail to account for the maximum limits of integer data types. The flaw allows the contract owner to manipulate token balances by setting them to arbitrary values, effectively creating a mechanism for unauthorized balance manipulation that could result in significant financial loss and contract integrity compromise.
The technical root cause of this vulnerability aligns with CWE-190, Integer Overflow or Wraparound, where the smart contract's mintToken function fails to properly validate input parameters before performing arithmetic operations. When the owner invokes this function with malicious parameters, the integer overflow occurs during balance calculations, enabling the manipulation of user account balances beyond normal operational constraints. This vulnerability specifically affects the Ethereum blockchain's smart contract execution environment where all computations must adhere to strict integer limitations and overflow protection mechanisms.
The operational impact of this vulnerability extends beyond simple balance manipulation to encompass potential systemic risks within the token ecosystem. An attacker with owner privileges could theoretically inflate user balances to arbitrary amounts, creating artificial scarcity or flooding the market with tokens. The vulnerability also presents risks for token governance and trust mechanisms, as it undermines the fundamental principle of transparent and secure token distribution. Additionally, the flaw could enable complex attack vectors including potential reentrancy issues or cascading failures within token-based applications that depend on accurate balance calculations.
Mitigation strategies for this vulnerability require immediate implementation of comprehensive input validation and integer overflow protection mechanisms within the smart contract code. The recommended approach involves implementing proper boundary checks and utilizing safe arithmetic libraries that prevent overflow conditions during balance calculations. Security audits should enforce strict adherence to established smart contract security standards including the use of verified libraries and formal verification techniques. Organizations should also implement multi-signature ownership controls and regular security assessments to prevent unauthorized access to contract owner privileges. The vulnerability demonstrates the critical importance of following established security frameworks such as the Ethereum Smart Contract Security Best Practices and implementing defense-in-depth strategies that protect against both known and potential future exploit vectors.