CVE-2023-27265 : What You Need to Know

This CVE-2023-27265 was assigned by Mattermost and published on February 27, 2023. The vulnerability allows an attacker with team admin privileges to discover the team owner's email address through the "Regenerate Invite Id" API endpoint in Mattermost versions below 7.7.0.

Understanding CVE-2023-27265

This section will delve into the specifics of CVE-2023-27265, highlighting its impact, technical details, affected systems, and mitigation strategies.

What is CVE-2023-27265?

CVE-2023-27265 involves a failure in Mattermost to adhere to the ShowEmailAddress setting when forming a response to the "Regenerate Invite Id" API endpoint. This oversight enables attackers with team admin permissions to extract the team owner's email address from the response.

The Impact of CVE-2023-27265

With a CVSS v3.1 base score of 2.7 (Low), this vulnerability poses limited risk. However, it can potentially expose sensitive information, specifically the team owner's email address, to unauthorized actors, leading to privacy breaches and targeted attacks.

Technical Details of CVE-2023-27265

Below are the key technical aspects related to CVE-2023-27265:

Vulnerability Description

The vulnerability arises due to Mattermost's failure to respect the ShowEmailAddress setting, resulting in the disclosure of the team owner's email address when utilizing the "Regenerate Invite Id" API endpoint.

Affected Systems and Versions

Only Mattermost versions up to 7.7.0 are impacted by this vulnerability, with version 5.12.0 specifically identified as susceptible to exploitation.

Exploitation Mechanism

Attackers with elevated team admin privileges can leverage the insecure response construction in the "Regenerate Invite Id" API endpoint to extract the team owner's email address, leveraging it for nefarious purposes.

Mitigation and Prevention

To address CVE-2023-27265 and enhance security measures, follow these essential steps:

Immediate Steps to Take

Update Mattermost to version 7.7.0 or higher to patch the vulnerability and prevent unauthorized access to sensitive information.

Long-Term Security Practices

Implement robust access control measures, regularly review and adjust privilege levels, and conduct security training to minimize the risk of similar vulnerabilities in the future.

Patching and Updates

Stay informed about security updates and best practices from Mattermost to ensure prompt application of patches and mitigate potential security threats effectively.