CVE-2017-18898 : Security Advisory and Response

A vulnerability has been identified in prior versions of Mattermost Server - 4.2.0, 4.1.1, and 4.0.5 - where manipulated posts have the potential to cause a web browser to become unresponsive.

Understanding CVE-2017-18898

This CVE involves a vulnerability in certain versions of Mattermost Server that could lead to a denial of service condition.

What is CVE-2017-18898?

CVE-2017-18898 is a security vulnerability found in Mattermost Server versions prior to 4.2.0, 4.1.1, and 4.0.5. It allows attackers to create specially crafted posts that may freeze a web browser when viewed.

The Impact of CVE-2017-18898

The exploitation of this vulnerability could result in a denial of service (DoS) condition, making the affected web browser unresponsive.

Technical Details of CVE-2017-18898

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

Vulnerability Description

The vulnerability in Mattermost Server versions before 4.2.0, 4.1.1, and 4.0.5 allows for the creation of malicious posts that can freeze web browsers upon viewing.

Affected Systems and Versions

Mattermost Server versions 4.2.0, 4.1.1, and 4.0.5

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting posts with specific content that triggers the unresponsive behavior in web browsers.

Mitigation and Prevention

Protecting systems from CVE-2017-18898 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update Mattermost Server to versions 4.2.0 or newer to mitigate the vulnerability.
Educate users to be cautious when interacting with posts containing suspicious content.

Long-Term Security Practices

Regularly update software and applications to the latest versions to patch known vulnerabilities.
Implement content security policies to prevent the execution of malicious scripts.

Patching and Updates

Apply patches and updates provided by Mattermost promptly to address security issues and prevent exploitation of vulnerabilities.