Mattermost versions 10.4.x <= 10.4.2, 10.3.x <= 10.3.3, 9.11.x <= 9.11.8, and 10.5.x <= 10.5.0 fail to enforce Multi-Factor Authentication (MFA) on plugin endpoints. This vulnerability allows authenticated attackers to bypass MFA protections by sending API requests to plugin-specific routes. The issue arises because the MFA enforcement mechanism does not properly validate authentication tokens for plugin endpoints, enabling attackers to access sensitive functionalities without completing the MFA process. This flaw is particularly critical in environments where MFA is a primary security control, as it undermines the integrity of the authentication process.
DailyCVE Form:
Platform: Mattermost
Version: 10.4.0 – 10.4.2, 10.3.0 – 10.3.3, 9.11.0 – 9.11.8, 10.5.0
Vulnerability: MFA Bypass
Severity: High
Date: Mar 21, 2025
What Undercode Say:
Exploitation:
1. Attackers authenticate normally using valid credentials.
2. They identify plugin-specific API endpoints.
3. Craft API requests targeting these endpoints.
- Bypass MFA checks due to improper token validation.
Protection:
- Update Mattermost to patched versions: 10.4.3, 10.3.4, 9.11.9, or 10.5.1.
2. Audit plugin endpoints for MFA enforcement.
3. Implement network-level restrictions for API access.
4. Monitor logs for unusual API requests.
Commands:
1. Check Mattermost version:
mattermost version
2. Update Mattermost:
sudo apt-get update && sudo apt-get install mattermost
3. Verify MFA enforcement:
curl -X GET -H "Authorization: Bearer <token>" http://<mattermost-url>/api/v4/plugins
Code Snippets:
1. Python script to detect vulnerable versions:
import requests
url = "http://<mattermost-url>/api/v4/system/ping"
response = requests.get(url)
if "10.4.2" in response.text:
print("Vulnerable version detected!")
2. Bash script to enforce MFA:
!/bin/bash if ! grep -q "enforce_mfa=true" /opt/mattermost/config/config.json; then echo "MFA not enforced. Updating config..." sed -i 's/"enforce_mfa": false/"enforce_mfa": true/g' /opt/mattermost/config/config.json fi
Analytics:
1. Monitor API request patterns for anomalies.
- Use SIEM tools to detect MFA bypass attempts.
3. Regularly review plugin endpoint access logs.
4. Conduct periodic security audits for MFA enforcement.
References:
1. GitHub Advisory Database: [bash]
2. National Vulnerability Database: [bash]
3. Mattermost Security Bulletin: [bash]
References:
Reported By: https://github.com/advisories/GHSA-72qv-j8vr-xvfv
Extra Source Hub:
Undercode
