CVE-2022-2408 : Security Advisory and Response

This article discusses the CVE-2022-2408 vulnerability in Mattermost, highlighting the impact, technical details, and mitigation strategies.

Understanding CVE-2022-2408

CVE-2022-2408, titled 'Guest accounts can list all public channels,' affects Mattermost versions up to 6.7.0, allowing unauthorized access to public channels.

What is CVE-2022-2408?

The vulnerability in Mattermost's Guest account feature permits guests to view all public channels within a team, even without access rights.

The Impact of CVE-2022-2408

The flaw enables guest users to fetch a list of all public channels, compromising confidentiality by exposing channel information.

Technical Details of CVE-2022-2408

The CVE has a CVSS v3.1 base score of 4.3, indicating a medium severity with low complexity and privileges required. It primarily impacts network security.

Vulnerability Description

The issue arises from the inadequate permission restrictions in the Guest account feature, allowing unauthorized users to access sensitive channel data.

Affected Systems and Versions

Mattermost versions 6.7.0 and earlier are vulnerable, including versions 6.4.x, 6.5.x, 6.6.x, and custom versions.

Exploitation Mechanism

Unauthorized guest users exploit the vulnerability by fetching a list of all public channels within a team, circumventing access controls.

Mitigation and Prevention

To address CVE-2022-2408, Mattermost recommends updating to versions v7.0.0, 6.7.1, 6.6.2, 6.5.2, 6.3.9, or higher to mitigate the risk of unauthorized channel access.

Immediate Steps to Take

Users are advised to update Mattermost to the latest secure version promptly.

Long-Term Security Practices

Implement strict permission controls and regular security updates to prevent unauthorized channel access.

Patching and Updates

Regularly monitor and apply the latest patches and updates provided by Mattermost to stay protected against vulnerabilities.