CVE-2017-18878 : Security Advisory and Response

A vulnerability has been found in prior versions of Mattermost Server, specifically 4.3.0, 4.2.1, and 4.1.2. If an attacker gains knowledge of a session ID, they can revoke the session of another user.

Understanding CVE-2017-18878

This CVE identifies a security issue in Mattermost Server versions prior to 4.3.0, 4.2.1, and 4.1.2.

What is CVE-2017-18878?

CVE-2017-18878 is a vulnerability that allows an attacker who obtains a session ID to revoke the session of another user on Mattermost Server.

The Impact of CVE-2017-18878

The exploitation of this vulnerability can lead to unauthorized access and disruption of user sessions on the affected server.

Technical Details of CVE-2017-18878

This section provides more technical insights into the CVE.

Vulnerability Description

The vulnerability in Mattermost Server versions before 4.3.0, 4.2.1, and 4.1.2 allows attackers with a session ID to revoke other users' sessions.

Affected Systems and Versions

Mattermost Server versions 4.3.0, 4.2.1, and 4.1.2

Exploitation Mechanism

Attackers exploit this vulnerability by gaining knowledge of a session ID to manipulate user sessions on the server.

Mitigation and Prevention

Protecting systems from CVE-2017-18878 requires specific actions.

Immediate Steps to Take

Upgrade Mattermost Server to version 4.3.0 or newer to mitigate the vulnerability.
Monitor and restrict access to session IDs to prevent unauthorized session revocation.

Long-Term Security Practices

Implement strong session management practices to enhance security.
Regularly review and update security protocols to address emerging threats.

Patching and Updates

Stay informed about security updates and patches released by Mattermost to address vulnerabilities like CVE-2017-18878.