CVE-2019-20847 : Vulnerability Insights and Analysis

A vulnerability has been found in the Mattermost Server version prior to 5.18.0 that allows an attacker to send a user_typing WebSocket event to any channel.

Understanding CVE-2019-20847

This CVE identifies a security issue in Mattermost Server that could be exploited by malicious actors.

What is CVE-2019-20847?

CVE-2019-20847 is a vulnerability in Mattermost Server versions before 5.18.0 that permits attackers to send a user_typing WebSocket event to any channel.

The Impact of CVE-2019-20847

This vulnerability could potentially lead to unauthorized users sending misleading or harmful messages in channels, impacting the integrity and security of communication within the platform.

Technical Details of CVE-2019-20847

This section provides more in-depth technical information about the CVE.

Vulnerability Description

The vulnerability allows attackers to send user_typing WebSocket events to channels, potentially leading to unauthorized messages being sent.

Affected Systems and Versions

Affected: Mattermost Server versions before 5.18.0

Exploitation Mechanism

Attackers can exploit this vulnerability by sending user_typing WebSocket events to any channel within the affected versions of Mattermost Server.

Mitigation and Prevention

Protecting systems from CVE-2019-20847 is crucial to maintaining security.

Immediate Steps to Take

Upgrade Mattermost Server to version 5.18.0 or later to mitigate the vulnerability.
Monitor channels for any suspicious user_typing WebSocket events.

Long-Term Security Practices

Regularly update and patch software to prevent known vulnerabilities.
Implement access controls to restrict unauthorized users from sending messages.

Patching and Updates

Stay informed about security updates and patches released by Mattermost to address vulnerabilities like CVE-2019-20847.