CVE-2018-12959 in Aditus
Summary
by MITRE
The approveAndCall function of a smart contract implementation for Aditus (ADI), an Ethereum ERC20 token, allows attackers to steal assets (e.g., transfer all contract balances into their account).
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Analysis
by VulDB Data Team • 03/08/2020
The CVE-2018-12959 vulnerability represents a critical flaw in the Aditus (ADI) ERC20 token smart contract implementation that fundamentally compromises the security of the token ecosystem. This vulnerability specifically targets the approveAndCall function, which serves as a mechanism for token approvals and subsequent automated calls to other contracts. The flaw enables malicious actors to exploit the contract's approval mechanism in a manner that allows them to transfer the entire contract balance into their own accounts, effectively draining all available assets. The vulnerability stems from improper input validation and insufficient access control measures within the approveAndCall function, creating an exploitable path that bypasses normal token transfer restrictions.
The technical implementation of this vulnerability manifests through a combination of improper parameter handling and inadequate state validation during the approveAndCall execution process. When users invoke the approveAndCall function, the contract fails to properly validate the input parameters, particularly the amount parameter that controls the token transfer. This validation gap allows attackers to manipulate the approval amount to an excessively large value or to bypass the intended approval limits entirely. The vulnerability operates at the intersection of multiple security principles, including proper input validation, access control, and state management. From a CWE perspective, this represents a classic instance of CWE-191 Integer Underflow/Overflow combined with CWE-284 Improper Access Control, creating a compound vulnerability that amplifies the potential impact of the exploit.
The operational impact of CVE-2018-12959 extends far beyond simple financial loss, as it fundamentally undermines the trust and integrity of the Aditus token ecosystem. The vulnerability enables attackers to drain all contract balances, potentially affecting thousands of token holders who had entrusted their assets to the platform. This type of vulnerability directly impacts the core functionality of ERC20 tokens and can lead to complete loss of funds for users who have interacted with the affected contract. The exploitability of this vulnerability is relatively high due to the nature of the approveAndCall function, which is commonly used in token implementations and often requires minimal privileges to invoke. Security researchers have documented similar patterns in other token contracts, indicating that this vulnerability type represents a broader class of issues affecting smart contract implementations.
Mitigation strategies for CVE-2018-12959 must address both immediate remediation and long-term architectural improvements in smart contract development practices. The primary fix involves implementing robust input validation and parameter checking within the approveAndCall function, ensuring that all approval amounts are properly constrained and validated against reasonable limits. Additionally, developers should implement proper access control mechanisms and consider using more secure patterns such as the ERC20 standard's approve function combined with safeTransferFrom calls rather than relying on approveAndCall implementations. The vulnerability highlights the importance of adhering to established security frameworks and best practices in smart contract development. Organizations should also implement comprehensive testing procedures including formal verification and security audits to identify similar vulnerabilities before deployment. From an ATT&CK framework perspective, this vulnerability maps to T1059 Command and Scripting Interpreter and T1190 Exploit Public-Facing Application, emphasizing the need for proper input validation and network security controls in blockchain environments.
The broader implications of CVE-2018-12959 extend to the entire Ethereum ecosystem, as it demonstrates the critical importance of secure smart contract implementation and the potential for widespread financial damage from a single vulnerability. This vulnerability serves as a reminder of the inherent risks in decentralized applications and the need for rigorous security practices throughout the development lifecycle. The incident underscores the necessity for comprehensive security testing, peer review processes, and adherence to established security standards in blockchain development. Organizations deploying smart contracts must consider not only the immediate functionality but also the potential attack surfaces and security implications of their implementations. The vulnerability also highlights the importance of community-driven security research and the need for transparent disclosure practices that enable timely remediation of security issues.