CVE-2017-18883 : Security Advisory and Response

Mattermost Server versions prior to 4.3.0, 4.2.1, and 4.1.2 have a vulnerability related to low entropy in authorization data when functioning as an OAuth 2.0 Service Provider.

Understanding CVE-2017-18883

This CVE identifies a security vulnerability in Mattermost Server versions.

What is CVE-2017-18883?

CVE-2017-18883 is a vulnerability in Mattermost Server versions before 4.3.0, 4.2.1, and 4.1.2 that affects the entropy of authorization data when operating as an OAuth 2.0 Service Provider.

The Impact of CVE-2017-18883

The vulnerability could potentially lead to unauthorized access to sensitive data and compromise the security of the server.

Technical Details of CVE-2017-18883

This section provides more technical insights into the CVE.

Vulnerability Description

The issue in Mattermost Server versions prior to 4.3.0, 4.2.1, and 4.1.2 involves low entropy for authorization data, particularly when serving as an OAuth 2.0 Service Provider.

Affected Systems and Versions

Mattermost Server versions before 4.3.0
Mattermost Server versions before 4.2.1
Mattermost Server versions before 4.1.2

Exploitation Mechanism

The vulnerability can be exploited by attackers to potentially gain unauthorized access to sensitive information due to the low entropy in authorization data.

Mitigation and Prevention

Protecting systems from CVE-2017-18883 is crucial to maintaining security.

Immediate Steps to Take

Upgrade Mattermost Server to version 4.3.0 or higher.
Implement strong authentication mechanisms.
Monitor and audit authorization data access.

Long-Term Security Practices

Regularly update and patch software to address security vulnerabilities.
Conduct security assessments and penetration testing to identify and mitigate risks.

Patching and Updates

Apply patches and updates provided by Mattermost to fix the vulnerability and enhance system security.