CVE-2023-2783 : Security Advisory and Response

This article provides an overview of CVE-2023-2783, which involves a vulnerability in the Mattermost App Framework that can lead to unauthorized modification of content.

Understanding CVE-2023-2783

CVE-2023-2783 highlights a security flaw in the Mattermost App Framework where it fails to verify a secret provided in an incoming webhook request. This oversight could enable malicious actors to tamper with the content of posts sent by the Apps.

What is CVE-2023-2783?

The vulnerability in Mattermost App Framework allows attackers to manipulate the post contents by exploiting the failure to authenticate the secret in webhook requests.

The Impact of CVE-2023-2783

With a CVSS base score of 4.3 (Medium Severity), the impact of CVE-2023-2783 is considered moderate. The vulnerability can potentially undermine data integrity, although it requires low privileges and user interaction.

Technical Details of CVE-2023-2783

The following technical aspects shed light on the vulnerability:

Vulnerability Description

The Mattermost Apps Framework lacks proper verification of the secret in incoming webhook requests, creating an opportunity for threat actors to modify post content.

Affected Systems and Versions

Affected Versions:

Mattermost App Framework versions <= 7.8.4
Mattermost App Framework versions <= 7.9.3
Mattermost App Framework version 7.10.0

Unaffected Versions:

Mattermost App Framework version 7.10.1
Mattermost App Framework version 7.8.5
Mattermost App Framework version 7.9.4

Exploitation Mechanism

The vulnerability can be exploited by leveraging the lack of secret verification in incoming webhook requests, enabling unauthorized modifications to posts.

Mitigation and Prevention

Addressing CVE-2023-2783 requires immediate action and preventive measures to enhance cybersecurity defenses.

Immediate Steps to Take

Update the Mattermost Server to versions 7.8.5, 7.9.4, 7.10.1, or higher to mitigate the vulnerability.

Long-Term Security Practices

Implement robust authentication mechanisms to validate incoming webhook requests effectively.
Regularly monitor and audit webhook interactions for any suspicious activity.

Patching and Updates

Stay informed about security updates and patches provided by Mattermost to address known vulnerabilities and enhance the security posture of the Mattermost App Framework.