CVE-2019-20863 : Security Advisory and Response

A vulnerability was found in Mattermost Server prior to version 5.13.0. The creation of incoming webhooks lacks appropriate restrictions.

Understanding CVE-2019-20863

An issue was discovered in Mattermost Server before 5.13.0. Incoming webhook creation is not properly restricted.

What is CVE-2019-20863?

This CVE identifies a vulnerability in Mattermost Server versions prior to 5.13.0, where the creation of incoming webhooks does not have adequate restrictions in place.

The Impact of CVE-2019-20863

The vulnerability could allow malicious actors to exploit the lack of restrictions in creating incoming webhooks, potentially leading to unauthorized access or other security breaches.

Technical Details of CVE-2019-20863

This section provides more technical insights into the vulnerability.

Vulnerability Description

The issue lies in the inadequate restrictions during the creation of incoming webhooks in Mattermost Server versions before 5.13.0.

Affected Systems and Versions

Affected: Mattermost Server versions prior to 5.13.0
Not affected: Versions from 5.13.0 onwards

Exploitation Mechanism

Malicious actors can exploit this vulnerability by leveraging the lack of appropriate restrictions in creating incoming webhooks, potentially gaining unauthorized access.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent exploitation of this vulnerability.

Immediate Steps to Take

Upgrade Mattermost Server to version 5.13.0 or later to mitigate the vulnerability.
Review and restrict permissions for creating incoming webhooks.

Long-Term Security Practices

Regularly update and patch Mattermost Server to ensure the latest security features are in place.
Conduct security audits and assessments to identify and address any potential vulnerabilities.

Patching and Updates

Stay informed about security updates and patches released by Mattermost.
Implement a robust patch management process to promptly apply necessary updates.