CVE-2023-35075 : What You Need to Know

A detailed analysis of CVE-2023-35075 focusing on the HTML injection vulnerability in Mattermost and its impact, technical details, and mitigation steps.

Understanding CVE-2023-35075

This section delves into the specifics of the vulnerability affecting Mattermost, leading to HTML injection via channel autocomplete.

What is CVE-2023-35075?

CVE-2023-35075 highlights a flaw in Mattermost where innerText/textContent isn't utilized when setting the channel name during autocomplete, enabling an attacker to inject HTML into a victim's page. While XSS isn't possible, HTML injection presents a security risk.

The Impact of CVE-2023-35075

The vulnerability's impact is rated low, with a CVSS base score of 3.1 due to the potential for unauthorized HTML injection, which can compromise the integrity of affected channels and content displayed.

Technical Details of CVE-2023-35075

Explore the technical aspects of the CVE, including the vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

Mattermost's failure to use innerText/textContent during autocomplete allows attackers to inject HTML via valid channel names, posing a risk of unauthorized content modification.

Affected Systems and Versions

Versions up to 7.8.12 and 8.1.3 of Mattermost are impacted, while 7.8.13 and 8.1.4 have been patched to address the vulnerability.

Exploitation Mechanism

Attackers can exploit the vulnerability by creating channel names with HTML elements, leveraging autocomplete to inject unauthorized HTML content.

Mitigation and Prevention

Discover the immediate steps to take, long-term security practices, and the importance of patching and updates.

Immediate Steps to Take

Users are advised to update Mattermost Server to versions 7.8.13, 8.1.4, or higher to mitigate the risk of HTML injection via channel autocomplete.

Long-Term Security Practices

Implement strict input validation in web applications to prevent HTML injection attacks and regularly update systems to protect against known vulnerabilities.

Patching and Updates

Regularly check for security updates and promptly apply patches provided by Mattermost to safeguard systems against potential HTML injection threats.