CVE-2019-20870 : What You Need to Know

A vulnerability has been found in Mattermost Server versions prior to 5.10.0, allowing unauthorized parties to evade the Edited flag by manipulating a post's file ID.

Understanding CVE-2019-20870

This CVE identifies a security issue in Mattermost Server that could be exploited by attackers to alter the appearance of the Edited flag on posts.

What is CVE-2019-20870?

This vulnerability in Mattermost Server versions before 5.10.0 enables malicious actors to bypass the expected display of the Edited flag by modifying a post's file ID.

The Impact of CVE-2019-20870

The vulnerability poses a risk of unauthorized manipulation of post content, potentially leading to misinformation or unauthorized changes within the platform.

Technical Details of CVE-2019-20870

This section provides more in-depth technical insights into the CVE.

Vulnerability Description

The issue allows attackers to change a post's file ID, evading the Edited flag's appearance as intended.

Affected Systems and Versions

Affected System: Mattermost Server
Affected Versions: Prior to 5.10.0

Exploitation Mechanism

By manipulating the file ID of a post, unauthorized parties can alter the appearance of the Edited flag, potentially misleading users.

Mitigation and Prevention

Protecting systems from CVE-2019-20870 requires immediate actions and long-term security practices.

Immediate Steps to Take

Upgrade Mattermost Server to version 5.10.0 or newer to mitigate the vulnerability.
Monitor post edits and file ID changes for suspicious activities.

Long-Term Security Practices

Regularly update and patch software to prevent known vulnerabilities.
Educate users on post security best practices to prevent unauthorized changes.

Patching and Updates

Apply patches and updates provided by Mattermost promptly to address security vulnerabilities and enhance system protection.