CVE-2018-13712 in PMET
Summary
by MITRE
The mintToken function of a smart contract implementation for PMET, 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-2018-13712 represents a critical integer overflow flaw within the mintToken function of a PMET Ethereum token smart contract implementation. This vulnerability stems from inadequate input validation and arithmetic overflow handling within the contract's code logic. The flaw allows the contract owner to manipulate user balances arbitrarily, fundamentally compromising the token's integrity and security model. The vulnerability directly maps to CWE-190, which describes integer overflow conditions where an integer value exceeds the maximum representable value for its data type, leading to unexpected behavior and potential exploitation.
The technical implementation of this vulnerability occurs when the mintToken function processes token minting operations without proper bounds checking or overflow protection mechanisms. When the contract owner invokes this function, they can manipulate the underlying arithmetic operations to cause integer overflow conditions that result in unexpected balance values. This occurs because the smart contract fails to validate that the minted token amount will not exceed the maximum value that can be represented by the integer data type used for balance storage. The overflow condition allows the owner to effectively bypass normal token issuance logic and directly manipulate account balances to arbitrary values, including potentially negative balances or extremely large values that exceed the intended token supply limits.
The operational impact of this vulnerability extends beyond simple balance manipulation to fundamentally compromise the token's economic model and user trust. An attacker with owner privileges can inflate user balances to any desired value, potentially enabling unauthorized token distribution, creating artificial scarcity, or manipulating token prices. This vulnerability undermines the core principles of blockchain-based token systems where transparency and immutability of balances are paramount. The exploitability of this condition means that any user who has not properly verified the contract's security can be affected by unauthorized balance manipulation, potentially leading to significant financial losses and contract devaluation. The vulnerability also creates potential for chain reaction effects where multiple contracts depend on the integrity of PMET balances, as demonstrated by similar vulnerabilities in the Ethereum ecosystem.
Mitigation strategies for this vulnerability require immediate code remediation through comprehensive input validation and overflow protection mechanisms. The smart contract implementation must include explicit bounds checking before any arithmetic operations and utilize safe arithmetic libraries or overflow detection patterns that prevent integer overflow conditions. The contract owner should implement proper access controls and consider using multi-signature wallets to reduce the risk of unauthorized access to privileged functions. Additionally, the contract should employ defensive programming practices such as the SafeMath library or similar mathematical operation libraries that automatically check for overflow conditions before performing arithmetic operations. Regular security audits and formal verification of smart contract code should be implemented to identify similar vulnerabilities across the entire codebase. This vulnerability also highlights the importance of adhering to established security standards such as those outlined in the OpenZeppelin security guidelines and following the ATT&CK framework's approach to smart contract security by identifying and mitigating privilege escalation vectors that allow for unauthorized state manipulation.