CVE-2023-47858 : Security Advisory and Response

A detailed overview of CVE-2023-47858 highlighting the vulnerability in Mattermost that allows unauthorized access to archived public channels of different teams.

Understanding CVE-2023-47858

This section delves into the specifics of the CVE-2023-47858 vulnerability found in Mattermost.

What is CVE-2023-47858?

CVE-2023-47858 highlights a flaw in Mattermost that fails to properly verify permissions, allowing unauthorized access to archived public channels of different teams.

The Impact of CVE-2023-47858

The vulnerability exposes sensitive information of archived public channels across teams, posing a risk to confidentiality.

Technical Details of CVE-2023-47858

Explore the technical aspects of CVE-2023-47858 to understand its implications.

Vulnerability Description

Mattermost's failure to verify permissions enables a user to access archived public channels of other teams, compromising data security.

Affected Systems and Versions

Versions up to 9.2.2 of Mattermost are affected, necessitating an update to versions 8.1.7, 9.0.5, 9.1.4, 9.2.3, or higher.

Exploitation Mechanism

Unauthorized access occurs through the GET /api/v4/teams/<team-id>/channels/deleted endpoint, exploiting the lack of proper permission validation.

Mitigation and Prevention

Learn how to mitigate the risks associated with CVE-2023-47858 and prevent unauthorized access to archived public channels.

Immediate Steps to Take

Update Mattermost Server to versions 8.1.7, 9.0.5, 9.1.4, 9.2.3, or higher to address the vulnerability and enhance data security.

Long-Term Security Practices

Implement strict permission controls and regular security audits to prevent similar access control issues in the future.

Patching and Updates

Stay informed about security updates and promptly apply patches released by Mattermost to protect against vulnerabilities.