CVE-2021-31865 : What You Need to Know

Redmine before 4.0.9, 4.1.x before 4.1.3, and 4.2.x before 4.2.1 allows users to circumvent the allowed filename extensions of uploaded attachments.

Understanding CVE-2021-31865

This CVE highlights a vulnerability in Redmine versions that enables users to bypass the restrictions on allowed filename extensions for uploaded attachments.

What is CVE-2021-31865?

CVE-2021-31865 pertains to the ability of users to evade the limitations set on the types of file extensions that can be uploaded as attachments in Redmine.

The Impact of CVE-2021-31865

This vulnerability could potentially lead to malicious users uploading harmful files with disguised extensions, posing a security risk to the system and its users.

Technical Details of CVE-2021-31865

This section delves into the specific technical aspects of the CVE.

Vulnerability Description

The vulnerability in Redmine versions prior to 4.0.9, 4.1.3, and 4.2.1 enables users to bypass the file extension restrictions, opening the door to potential security breaches.

Affected Systems and Versions

Redmine versions before 4.0.9, 4.1.3, and 4.2.1 are impacted by this CVE, putting systems running these versions at risk.

Exploitation Mechanism

Malicious actors can exploit this vulnerability by uploading files with forbidden extensions, thereby compromising the integrity and security of the system.

Mitigation and Prevention

In this section, we discuss the steps to mitigate and prevent the exploitation of CVE-2021-31865.

Immediate Steps to Take

System administrators are advised to apply patches or updates released by Redmine promptly to address this vulnerability.

Long-Term Security Practices

Implementing stricter upload policies, monitoring file activities, and educating users on safe upload practices can help enhance system security.

Patching and Updates

Regularly check for security advisories from Redmine and apply patches or updates to ensure that systems are protected from known vulnerabilities.