CVE-2018-18425 in Primeo
Summary
by MITRE
The doAirdrop function of a smart contract implementation for Primeo (PEO), an Ethereum token, does not check the numerical relationship between the amount of the air drop and the token's total supply, which lets the owner of the contract issue an arbitrary amount of currency. (Increasing the total supply by using 'doAirdrop' ignores the hard cap written in the contract and devalues the token.)
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Analysis
by VulDB Data Team • 10/06/2023
The vulnerability identified in CVE-2018-18425 represents a critical flaw in the smart contract implementation of Primeo (PEO) token on the Ethereum blockchain. This issue manifests within the doAirdrop function which lacks proper validation mechanisms to ensure that token distribution operations remain within predefined contractual limits. The absence of checks governing the relationship between airdrop amounts and the token's total supply creates a fundamental weakness that directly undermines the economic integrity of the token ecosystem. The smart contract implementation fails to enforce the hard cap mechanism that should govern maximum token issuance, allowing malicious actors or contract owners to arbitrarily inflate the token supply without proper constraints.
The technical nature of this vulnerability stems from the lack of input validation and boundary checking within the doAirdrop function. According to CWE-191, this represents an integer underflow or overflow condition where the contract fails to validate numerical relationships between different token quantities. The flaw operates at the core of the token's economic model by permitting unauthorized supply increases that bypass established governance mechanisms. When the owner executes the doAirdrop function, the contract processes the transaction without verifying whether the proposed distribution would exceed predetermined limits, effectively creating a mechanism for unlimited token creation. This vulnerability directly violates the fundamental principles of blockchain token economics where supply constraints are essential for maintaining value propositions and investor confidence.
The operational impact of this vulnerability extends beyond simple monetary inflation to encompass broader security and trust implications within the Primeo token ecosystem. The ability to arbitrarily increase supply creates potential for economic manipulation and devaluation of existing token holdings, as demonstrated by the ATT&CK technique T1499.200 which involves data manipulation and financial fraud through blockchain exploits. Token holders face immediate economic risk as their holdings become diluted through unauthorized supply increases, while the overall market confidence in the token's stability and governance mechanisms erodes. The vulnerability also creates potential for insider trading opportunities where contract owners can manipulate supply to their advantage, undermining the decentralized and transparent nature that blockchain technology aims to provide.
Mitigation strategies for this vulnerability require immediate implementation of comprehensive input validation mechanisms within the smart contract code. The fix should enforce strict checks that validate the relationship between airdrop amounts and available token supply, ensuring that all distribution operations remain within the established hard cap parameters. Security audits should implement automated testing procedures to verify that all token distribution functions properly validate numerical constraints before execution. Additionally, the contract should incorporate proper access control mechanisms to prevent unauthorized individuals from executing supply-increasing operations. The remediation process must also include thorough testing of edge cases and boundary conditions to ensure that no additional pathways exist for bypassing supply limitations. Industry best practices recommend implementing the principle of least privilege and comprehensive logging of all supply-related operations to maintain audit trails and detect unauthorized activities.