CVE-2024-56529
📋 TL;DR
Mailcow email server has a session fixation vulnerability where attackers can set session cookies on victim browsers when HSTS is disabled. After victims log in, attackers can hijack their authenticated sessions to access the web panel. This affects all Mailcow installations up to version 2024-11b.
💻 Affected Systems
- mailcow-dockerized
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of mail server administration panel leading to email system takeover, data exfiltration, and further network compromise.
Likely Case
Unauthorized access to email administration panel allowing email account manipulation, configuration changes, and potential data access.
If Mitigated
Limited impact with proper HSTS enabled and session management controls in place.
🎯 Exploit Status
Requires attacker to set session cookie before victim logs in and HSTS disabled on browser.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2024-11c and later
Vendor Advisory: https://github.com/mailcow/mailcow-dockerized/security/advisories/GHSA-23c8-4wwr-g3c6
Restart Required: No
Instructions:
1. Update mailcow-dockerized to version 2024-11c or later. 2. Run ./update.sh from mailcow directory. 3. Verify update completed successfully.
🔧 Temporary Workarounds
Enable HSTS Enforcement
allForce HTTPS and prevent session cookie manipulation by enabling HSTS headers
Add 'Strict-Transport-Security: max-age=31536000; includeSubDomains' to web server headers
Session Regeneration on Login
allImplement custom session regeneration after successful authentication
🧯 If You Can't Patch
- Enable HSTS headers on web server and force HTTPS connections
- Implement additional authentication factors and monitor for suspicious admin panel access
🔍 How to Verify
Check if Vulnerable:
Check mailcow version with: grep MAILCOW_VERSION mailcow.conf | cut -d'=' -f2Check Version:
grep MAILCOW_VERSION mailcow.conf | cut -d'=' -f2Verify Fix Applied:
Verify version is 2024-11c or later and check that session cookies are regenerated after login📡 Detection & Monitoring
Log Indicators:
- Multiple admin logins from different IPs with same session ID
- Admin panel access from unexpected locations
Network Indicators:
- HTTP requests with manipulated session cookies
- Unusual admin panel access patterns
SIEM Query:
source="mailcow" action="login" | stats count by session_id | where count > 1