CVE-2021-31864 : Exploit Details and Defense Strategies

Redmine before 4.0.9, 4.1.x before 4.1.3, and 4.2.x before 4.2.1 are impacted by CVE-2021-31864, allowing attackers to bypass the add_issue_notes permission by using the incoming mail handler.

Understanding CVE-2021-31864

This vulnerability in Redmine versions allows unauthorized users to circumvent the add_issue_notes permission control.

What is CVE-2021-31864?

CVE-2021-31864 affects Redmine versions before 4.0.9, 4.1.x before 4.1.3, and 4.2.x before 4.2.1. It enables malicious actors to bypass certain permission requirements through the incoming mail handler.

The Impact of CVE-2021-31864

The vulnerability can lead to unauthorized access and manipulation of issue notes by attackers leveraging the loophole in permission verification.

Technical Details of CVE-2021-31864

This section provides detailed insights into the vulnerability.

Vulnerability Description

Redmine instances before specified versions are susceptible to unauthorized users bypassing the add_issue_notes requirement.

Affected Systems and Versions

Redmine versions before 4.0.9, 4.1.x before 4.1.3, and 4.2.x before 4.2.1 are impacted by this vulnerability.

Exploitation Mechanism

Attackers exploit the vulnerability through the incoming mail handler, bypassing the add_issue_notes permission.

Mitigation and Prevention

Discover the necessary steps to enhance security and protect Redmine instances.

Immediate Steps to Take

It is crucial to update Redmine to versions 4.0.9, 4.1.3, or 4.2.1 to mitigate the risk of unauthorized access.

Long-Term Security Practices

Regularly monitor security advisories and apply updates promptly to prevent potential vulnerabilities.

Patching and Updates

Stay informed about security patches released by Redmine and apply them promptly to maintain the integrity of the platform.