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CVE-2025-30179 exploits a flaw in Mattermost’s multi-factor authentication (MFA) enforcement for specific search APIs. When users perform searches (user, channel, or team), the system fails to validate MFA status, allowing authenticated attackers to bypass MFA protections. The vulnerability occurs because the API endpoints do not inherit MFA checks from the main authentication flow. Attackers can craft search queries to access restricted data without providing a second authentication factor.
DailyCVE Form:
Platform: Mattermost
Version: 10.4.x <= 10.4.2, 10.3.x <= 10.3.3, 9.11.x <= 9.11.8
Vulnerability: MFA Bypass
Severity: Critical
Date: 03/27/2025
What Undercode Say:
Exploitation:
1. Exploit Command (Curl):
curl -X POST "https://<target>/api/v4/users/search" -H "Authorization: Bearer <token>" -d '{"term":"admin"}'
2. Manual Bypass Steps:
- Authenticate with stolen credentials (no MFA).
- Query `/api/v4/users/search` for sensitive data.
- Extract user details, channels, or teams.
Protection:
1. Patch Upgrade:
sudo apt update && sudo apt upgrade mattermost
2. Temporary Mitigation:
- Disable affected search APIs via
config.json:"EnableUserSearch": false, "EnableChannelSearch": false
3. Log Monitoring:
grep "POST /api/v4/.search" /var/log/mattermost/access.log
4. Nginx WAF Rule:
location ~ /api/v4/(users|channels|teams)/search {
if ($http_authorization !~ "mfa_validated=true") {
return 403;
}
}
5. Mattermost Plugin Check:
mmctl plugin list | grep "mfa-enforcer"
6. Exploit Detection (Python):
import requests
headers = {"Authorization": "Bearer <token>"}
response = requests.post("https://<target>/api/v4/users/search", headers=headers, json={"term": ""})
if response.status_code == 200 and "mfa_required" not in response.text:
print("Vulnerable to CVE-2025-30179")
7. Post-Patch Verification:
mmctl version | grep "10.4.3|10.3.4|9.11.9"
8. Fail2Ban Rule:
[bash] failregex = ^<HOST>.POST./api/v4/.search. 200
9. Kubernetes Admission Control:
apiVersion: policy/v1 kind: PodSecurityPolicy metadata: name: block-mattermost-old spec: allowedImages: - ":10.4.3" - ":10.3.4"
10. SIEM Query (Splunk):
index=mattermost_logs "POST /api/v4//search" | stats count by user
References:
Reported By: https://nvd.nist.gov/vuln/detail/CVE-2025-30179
Extra Source Hub:
Undercode
