CVE-2023-5159 : Exploit Details and Defense Strategies

This CVE record was published by Mattermost on September 29, 2023, after being reserved on September 25, 2023. It highlights a vulnerability that could allow a User Manager role with user edit permissions to manage/update bots in Mattermost.

Understanding CVE-2023-5159

This section will delve into the details of CVE-2023-5159 and its impact on Mattermost systems.

What is CVE-2023-5159?

CVE-2023-5159 points out a flaw in Mattermost where permissions are inadequately verified when managing/updating a bot, enabling a User Manager role with user edit permissions to conduct these actions.

The Impact of CVE-2023-5159

The impact of this vulnerability is rated as low severity. An attacker with high privileges could exploit this flaw to manage/update bots without proper authorization, potentially leading to unauthorized access or manipulation of bot functionalities.

Technical Details of CVE-2023-5159

In this section, we will explore the vulnerability description, affected systems and versions, as well as the exploitation mechanism associated with CVE-2023-5159.

Vulnerability Description

The vulnerability arises from Mattermost's failure to adequately verify permissions, specifically related to managing/updating bots, allowing unauthorized actions by users with a User Manager role and user edit permissions.

Affected Systems and Versions

Affected Versions:
Mattermost versions less than or equal to 8.7.9 and 8.1.0
Unaffected Versions:
Mattermost version 7.8.10 and 8.1.1

Exploitation Mechanism

The exploitation of this vulnerability requires a user account with a User Manager role and user edit permissions to take advantage of the insufficient permission verification process and carry out unauthorized bot management/update actions.

Mitigation and Prevention

To mitigate the risks associated with CVE-2023-5159, it is essential to take immediate steps, implement long-term security practices, and apply necessary patches and updates.

Immediate Steps to Take

Users are advised to update the Mattermost Server to versions 7.8.10, 8.1.1, or higher to address this vulnerability and prevent unauthorized bot management/update activities.

Long-Term Security Practices

Implementing a least privilege access control model, regularly reviewing and adjusting user roles and permissions, and conducting security training for users can enhance the overall security posture and prevent similar authorization issues in the future.

Patching and Updates

Regularly monitoring for security updates from Mattermost and promptly applying patches and updates can help alleviate security risks and ensure that known vulnerabilities are mitigated in a timely manner.