CVE-2021-25837 in Ethermint
Summary
by MITRE • 02/09/2021
Cosmos Network Ethermint
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Analysis
by VulDB Data Team • 02/25/2021
The Cosmos Network Ethermint vulnerability CVE-2021-25837 represents a critical security flaw that affects the Ethereum compatibility layer within the Cosmos ecosystem. This vulnerability specifically targets the Ethermint implementation which enables Cosmos-based blockchains to execute Ethereum Virtual Machine contracts and interact with Ethereum tools and applications. The flaw manifests in the transaction processing mechanism where improper validation of transaction data allows for malicious actors to manipulate the state of the blockchain network. This vulnerability stems from insufficient input sanitization and validation processes that should occur during transaction handling within the Ethermint environment, creating an avenue for potential attackers to exploit the system's trust model.
The technical implementation of this vulnerability resides in the transaction validation subsystem where the system fails to properly verify the integrity of transaction parameters before executing them within the Ethereum Virtual Machine context. This weakness creates a path for attackers to submit malformed transactions that can bypass normal security checks and potentially alter the state of accounts or contracts within the network. The flaw operates at the intersection of blockchain consensus mechanisms and smart contract execution, where the standard Ethereum transaction validation procedures are not adequately enforced. According to CWE classification, this vulnerability aligns with CWE-20: Improper Input Validation, which encompasses the failure to properly validate input data before processing. The vulnerability is particularly concerning because it affects the fundamental trust assumptions of the Cosmos network's interoperability features, potentially allowing for unauthorized fund transfers or contract manipulations.
The operational impact of CVE-2021-25837 extends beyond simple transaction manipulation to potentially compromise the entire integrity of the Cosmos network's Ethereum compatibility layer. Attackers could exploit this vulnerability to execute unauthorized transactions, manipulate account balances, or disrupt the normal operation of smart contracts deployed on the network. The attack surface is particularly wide given that Ethermint serves as a bridge between Cosmos and Ethereum ecosystems, making the impact felt across both networks. This vulnerability directly relates to the ATT&CK technique T1059.001: Command and Scripting Interpreter - PowerShell, as attackers could leverage the compromised transaction processing to execute malicious commands within the Ethereum Virtual Machine. The consequences include potential financial losses for users who have funds in networks utilizing affected Ethermint implementations, as well as damage to the reputation and trust in the Cosmos network's security infrastructure.
Mitigation strategies for CVE-2021-25837 require immediate patching of affected Ethermint implementations and comprehensive validation of all transaction processing components. Network operators must implement enhanced input validation procedures that strictly enforce transaction parameter checking before execution. The recommended approach includes deploying updated firmware and software versions that address the specific validation gaps in the transaction processing pipeline. Organizations should also implement monitoring systems that can detect anomalous transaction patterns that may indicate exploitation attempts. Security teams should conduct thorough vulnerability assessments of all Cosmos-based networks that utilize Ethermint functionality to identify potential exposure. Additionally, implementing network segmentation and access controls can limit the potential impact if exploitation occurs. The remediation process should follow the principle of least privilege, ensuring that transaction processing components have minimal necessary permissions to reduce the attack surface. Regular security audits and penetration testing should be conducted to verify that the implemented fixes properly address the vulnerability and do not introduce new security weaknesses.