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CVE-2023-3586 Explained : Impact and Mitigation

Learn about CVE-2023-3586 impacting Mattermost. Disabling public boards doesn't prevent access, posing a medium-risk security threat. Update to secure versions v7.8.7+.

This CVE-2023-3586 impacts Mattermost and was published on July 17, 2023, by the assigner Mattermost. The vulnerability allows previously shared public boards to remain accessible even after the "Enable Publicly-Shared Boards" configuration option is disabled.

Understanding CVE-2023-3586

CVE-2023-3586 in Mattermost arises from a flaw where disabling publicly-shared boards does not effectively disable existing publicly available board links, leaving them accessible.

What is CVE-2023-3586?

CVE-2023-3586 involves Mattermost's failure to disable public Boards after the "Enable Publicly-Shared Boards" configuration option is turned off, leading to previously shared public Boards staying accessible.

The Impact of CVE-2023-3586

The impact of this vulnerability is rated as MEDIUM with a CVSSv3.1 base score of 4.2. The attack complexity is considered HIGH, with no availability impact but low confidentiality and integrity impacts. This vulnerability requires low privileges and no user interaction.

Technical Details of CVE-2023-3586

This section provides additional technical insights into the vulnerability.

Vulnerability Description

The vulnerability in Mattermost allows previously shared public boards to remain accessible even after the "Enable Publicly-Shared Boards" configuration option is disabled.

Affected Systems and Versions

The affected versions of Mattermost include 7.8.6, 7.9.4, and 7.10.2, while versions 7.8.7, 7.9.5, and 7.10.3 are unaffected.

Exploitation Mechanism

The vulnerability can be exploited by an attacker to access previously shared public boards that should have been disabled, potentially leading to unauthorized access to sensitive information.

Mitigation and Prevention

To address CVE-2023-3586 in Mattermost, users are recommended to take the following steps:

Immediate Steps to Take

Update the Mattermost Server to versions v7.8.7, v7.9.5, v7.10.3, or higher to mitigate the vulnerability.

Long-Term Security Practices

Regularly review and update configuration settings in Mattermost to ensure the security of public boards and other shared features.

Patching and Updates

Stay informed about security updates and patches released by Mattermost to address vulnerabilities promptly and maintain a secure environment.

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