CVE-2017-18893 : Security Advisory and Response

A vulnerability has been identified in Mattermost Server versions prior to 4.2.0, 4.1.1, and 4.0.5, where display names are susceptible to cross-site scripting (XSS) attacks.

Understanding CVE-2017-18893

In Mattermost Server versions before 4.2.0, 4.1.1, and 4.0.5, a security vulnerability exists that could allow for XSS attacks through display names.

What is CVE-2017-18893?

This CVE refers to a specific vulnerability in Mattermost Server versions before 4.2.0, 4.1.1, and 4.0.5, where malicious actors can exploit cross-site scripting (XSS) through display names.

The Impact of CVE-2017-18893

The vulnerability could lead to potential XSS attacks, allowing attackers to execute malicious scripts in the context of a user's session.

Technical Details of CVE-2017-18893

In-depth technical information about the vulnerability.

Vulnerability Description

The issue in Mattermost Server versions before 4.2.0, 4.1.1, and 4.0.5 allows for XSS attacks through display names, posing a security risk.

Affected Systems and Versions

Mattermost Server versions prior to 4.2.0
Mattermost Server versions prior to 4.1.1
Mattermost Server versions prior to 4.0.5

Exploitation Mechanism

Attackers can exploit this vulnerability by injecting malicious scripts into display names, which are not properly sanitized, leading to XSS attacks.

Mitigation and Prevention

Measures to address and prevent the CVE-2017-18893 vulnerability.

Immediate Steps to Take

Upgrade Mattermost Server to version 4.2.0 or newer to mitigate the vulnerability.
Avoid clicking on suspicious links or opening attachments from unknown sources.

Long-Term Security Practices

Regularly update and patch software to the latest versions to address security vulnerabilities.
Educate users on safe browsing practices and the risks of XSS attacks.

Patching and Updates

Stay informed about security updates from Mattermost and apply patches promptly to secure the system.