CVE-2019-20889 : Exploit Details and Defense Strategies

A vulnerability has been found in versions 5.7, 5.6.3, 5.5.2, and 4.10.5 of Mattermost Server related to the incorrect handling of permissions when creating user-access tokens.

Understanding CVE-2019-20889

This CVE identifies an issue in Mattermost Server versions prior to 5.7, 5.6.3, 5.5.2, and 4.10.5 that mishandles permissions during user-access token creation.

What is CVE-2019-20889?

CVE-2019-20889 is a vulnerability in Mattermost Server versions before 5.7, 5.6.3, 5.5.2, and 4.10.5, where permissions for user-access token creation are not handled correctly.

The Impact of CVE-2019-20889

The vulnerability could allow unauthorized users to create user-access tokens, potentially leading to unauthorized access to sensitive information or actions within the Mattermost Server.

Technical Details of CVE-2019-20889

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability in Mattermost Server versions before 5.7, 5.6.3, 5.5.2, and 4.10.5 arises from the mishandling of permissions during the creation of user-access tokens.

Affected Systems and Versions

Mattermost Server versions 5.7, 5.6.3, 5.5.2, and 4.10.5

Exploitation Mechanism

Unauthorized users can exploit this vulnerability to create user-access tokens, potentially gaining unauthorized access to sensitive data or functionalities.

Mitigation and Prevention

To address CVE-2019-20889, follow these mitigation and prevention strategies:

Immediate Steps to Take

Upgrade Mattermost Server to version 5.7 or later to mitigate the vulnerability.
Monitor user-access token creation for any suspicious activities.

Long-Term Security Practices

Regularly review and update permission settings within the Mattermost Server.
Educate users on secure token creation practices to prevent unauthorized access.

Patching and Updates

Apply patches and updates provided by Mattermost to ensure the security of the server.