CVE-2017-18870 : What You Need to Know

A flaw in Mattermost Server versions 4.5.0, 4.4.5, and 4.3.4 mishandled access control for webhooks in the EnableOnlyAdminIntegrations scenario.

Understanding CVE-2017-18870

This CVE involves a vulnerability in Mattermost Server versions that could lead to access control issues for webhooks.

What is CVE-2017-18870?

This CVE identifies a specific flaw in Mattermost Server versions 4.5.0, 4.4.5, and 4.3.4 related to mishandling access control for webhooks in a particular scenario.

The Impact of CVE-2017-18870

The vulnerability could potentially allow unauthorized access through webhooks, compromising the security of the affected systems.

Technical Details of CVE-2017-18870

This section provides more technical insights into the vulnerability.

Vulnerability Description

The issue in Mattermost Server versions before 4.5.0, 4.4.5, and 4.3.4 mishandled webhook access control specifically in the EnableOnlyAdminIntegrations case.

Affected Systems and Versions

Mattermost Server versions 4.5.0, 4.4.5, and 4.3.4

Exploitation Mechanism

The vulnerability could be exploited by attackers to bypass access controls and gain unauthorized access through webhooks.

Mitigation and Prevention

Protecting systems from this vulnerability is crucial.

Immediate Steps to Take

Update Mattermost Server to versions 4.5.0 or newer to mitigate the issue
Review and adjust webhook access controls

Long-Term Security Practices

Regularly monitor and audit webhook usage
Implement least privilege access controls for integrations

Patching and Updates

Stay informed about security updates from Mattermost
Apply patches promptly to address known vulnerabilities