CVE-2021-25834 : Exploit Details and Defense Strategies

Cosmos Network Ethermint <= v0.4.0 is affected by a transaction replay vulnerability in the EVM module. If the victim sends a very large nonce transaction, the attacker can replay the transaction through the application.

Understanding CVE-2021-25834

This section provides detailed insights into the impact, technical details, and mitigation strategies related to CVE-2021-25834.

What is CVE-2021-25834?

CVE-2021-25834 is a vulnerability in Cosmos Network Ethermint <= v0.4.0 that allows attackers to replay transactions by exploiting a weakness in the EVM module.

The Impact of CVE-2021-25834

The vulnerability can be exploited by attackers to replay transactions initially performed by victims, potentially leading to unauthorized activities within the application.

Technical Details of CVE-2021-25834

In-depth technical analysis of the vulnerability including its description, affected systems and versions, and exploitation mechanism.

Vulnerability Description

The vulnerability arises due to a flaw in the EVM module of Cosmos Network Ethermint <= v0.4.0, enabling attackers to replay very large nonce transactions initiated by victims.

Affected Systems and Versions

Cosmos Network Ethermint version <= v0.4.0 is specifically impacted by this vulnerability, making systems with this version susceptible to transaction replay attacks.

Exploitation Mechanism

Attackers exploit the vulnerability by replaying very large nonce transactions sent by victims, leveraging the weak security implementation within the EVM module.

Mitigation and Prevention

This section outlines immediate steps to take and long-term security practices to mitigate the risks associated with CVE-2021-25834.

Immediate Steps to Take

Update Cosmos Network Ethermint to versions above v0.4.0 to patch the vulnerability
Monitor transactions for any abnormal or duplicated activities that could indicate a replay attack

Long-Term Security Practices

Regularly update and maintain the application to address known vulnerabilities promptly
Implement secure coding practices and conduct thorough security audits regularly

Patching and Updates

Stay informed about security patches released by the software provider and apply them promptly to ensure protection against potential vulnerabilities.