CVE-2017-18892 : Vulnerability Insights and Analysis

A vulnerability was found in Mattermost Server versions prior to 4.2.0, 4.1.1, and 4.0.5 where e-mail templates contain a field where HTML content is not properly sanitized.

Understanding CVE-2017-18892

This CVE identifies a security issue in Mattermost Server versions before 4.2.0, 4.1.1, and 4.0.5 where HTML content in e-mail templates is not adequately sanitized.

What is CVE-2017-18892?

This CVE pertains to a vulnerability in Mattermost Server that allows HTML content to be included in e-mail templates without proper sanitization, potentially leading to security risks.

The Impact of CVE-2017-18892

The vulnerability could be exploited by attackers to inject malicious code into e-mail templates, leading to various security threats such as cross-site scripting (XSS) attacks.

Technical Details of CVE-2017-18892

This section provides more technical insights into the CVE.

Vulnerability Description

The issue in Mattermost Server versions before 4.2.0, 4.1.1, and 4.0.5 allows HTML content in e-mail templates without proper neutralization, 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 HTML code into e-mail templates, potentially executing unauthorized actions.

Mitigation and Prevention

To address CVE-2017-18892, follow these mitigation strategies:

Immediate Steps to Take

Update Mattermost Server to version 4.2.0 or newer.
Implement strict input validation for e-mail templates to prevent HTML injection.

Long-Term Security Practices

Regularly monitor and audit e-mail templates for any suspicious content.
Educate users on the risks of HTML injection and best practices for secure coding.

Patching and Updates

Stay informed about security updates from Mattermost and promptly apply patches to mitigate known vulnerabilities.