CVE-2024-41958
📋 TL;DR
This vulnerability allows authenticated attackers to bypass two-factor authentication (2FA) in mailcow: dockerized email systems. Attackers need credentials for both their own account and a target account with 2FA enabled. All mailcow installations using affected versions are vulnerable until patched.
💻 Affected Systems
- mailcow: dockerized
📦 What is this software?
Mailcow\ by Mailcow
⚠️ Risk & Real-World Impact
Worst Case
Complete account takeover of any 2FA-protected account, leading to email interception, data theft, and potential lateral movement within the organization.
Likely Case
Targeted account compromise of specific users, potentially enabling business email compromise (BEC) attacks or credential harvesting.
If Mitigated
Limited impact if strong credential hygiene is maintained and accounts are monitored for suspicious activity.
🎯 Exploit Status
Exploitation requires authenticated access and knowledge of target credentials. The vulnerability is in the 2FA bypass logic itself.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2024-07 release
Vendor Advisory: https://github.com/mailcow/mailcow-dockerized/security/advisories/GHSA-4fcc-q245-qqgg
Restart Required: Yes
Instructions:
1. Update mailcow using the update script: cd /opt/mailcow-dockerized && sudo ./update.sh 2. Follow the update prompts and restart containers 3. Verify all services are running properly
🧯 If You Can't Patch
- Disable 2FA for all accounts (not recommended as it reduces security)
- Implement network segmentation to restrict access to mailcow administration interface
🔍 How to Verify
Check if Vulnerable:
Check mailcow version: cd /opt/mailcow-dockerized && grep MAILCOW_VERSION mailcow.confCheck Version:
cd /opt/mailcow-dockerized && grep MAILCOW_VERSION mailcow.confVerify Fix Applied:
Verify version shows 2024-07 or later and test 2FA functionality with test accounts📡 Detection & Monitoring
Log Indicators:
- Multiple failed 2FA attempts followed by successful login
- Login from unusual locations without 2FA challenge
- Administrative access without 2FA verification
Network Indicators:
- Unusual authentication patterns to mailcow web interface
- Multiple authentication requests in short timeframes
SIEM Query:
source="mailcow" AND (event="authentication" OR event="2fa") AND result="success" AND 2fa_challenge="false"