CVE-2021-25835 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-2021-25835 represents a critical security flaw within the Ethereum-compatible blockchain implementation that forms part of the Cosmos ecosystem. This vulnerability specifically affects the Ethermint module which enables Ethereum Virtual Machine compatibility within Cosmos-based networks. The flaw manifests in the improper handling of transaction processing and state updates, creating potential pathways for malicious actors to manipulate the blockchain consensus mechanism and compromise network integrity.
The technical root cause of this vulnerability stems from inadequate input validation and insufficient state transition management within the Ethermint execution environment. When processing certain Ethereum transactions, the system fails to properly validate the transaction parameters and their interaction with the underlying Cosmos state machine. This weakness allows for the exploitation of a specific class of transaction sequences that can lead to unintended state modifications. The vulnerability operates at the intersection of Ethereum transaction processing and Cosmos consensus mechanisms, creating a complex attack surface where traditional Ethereum security models may not fully apply. According to CWE classification, this vulnerability maps to CWE-129 Input Validation and CWE-284 Improper Access Control, as it involves both inadequate validation of external inputs and insufficient access control mechanisms during state transitions.
The operational impact of CVE-2021-25835 extends beyond simple transaction manipulation to potentially compromise the entire blockchain network integrity. Attackers could exploit this vulnerability to perform double-spending operations, manipulate account balances, or disrupt consensus mechanisms that maintain network security. The vulnerability particularly affects networks running Ethermint versions prior to the patched release, making numerous Cosmos-based projects and their associated assets vulnerable to exploitation. Given the interconnected nature of Cosmos networks and their reliance on shared security models, the impact could cascade across multiple blockchain implementations that utilize similar Ethereum compatibility layers. This vulnerability directly aligns with ATT&CK technique T1588.002 for the development of tools and T1498.001 for the deployment of resource hijacking, as it enables attackers to manipulate network resources and potentially gain unauthorized access to network consensus mechanisms.
Mitigation strategies for CVE-2021-25835 require immediate patching of all affected Ethermint implementations and comprehensive network monitoring for suspicious transaction patterns. Organizations should implement robust input validation procedures and enhance their state transition auditing mechanisms to detect anomalous behavior. The recommended approach includes upgrading to patched versions of the Ethermint module, implementing additional transaction validation layers, and establishing monitoring protocols that can detect deviations from normal transaction processing patterns. Network operators must also consider implementing network segmentation strategies to limit the potential impact of any successful exploitation attempts. Security teams should conduct thorough penetration testing of their Ethermint implementations and establish incident response procedures specifically tailored to address vulnerabilities in Ethereum-compatible blockchain environments. The vulnerability highlights the importance of maintaining security awareness in cross-platform blockchain implementations and the necessity of continuous security auditing for complex distributed systems that bridge multiple blockchain architectures and security models.