CVE-2025-45731
📋 TL;DR
A race condition in 2FAuth v5.5.0 allows data inconsistencies and orphaned accounts when a group is deleted while other operations are pending. This affects administrators managing 2FA groups and can lead to authentication system corruption. Users of 2FAuth v5.5.0 are vulnerable.
💻 Affected Systems
- 2FAuth
📦 What is this software?
2fauth by 2fauth
⚠️ Risk & Real-World Impact
Worst Case
Complete corruption of 2FA group data leading to authentication failures, orphaned accounts that cannot be managed, and potential denial of service for affected users.
Likely Case
Data inconsistencies in group management, orphaned accounts requiring manual cleanup, and minor authentication disruptions for affected users.
If Mitigated
Minor data inconsistencies that can be resolved through manual database cleanup with no authentication impact.
🎯 Exploit Status
Requires administrative access to trigger group deletion while other operations are pending. Race conditions are timing-dependent and may be difficult to reliably exploit.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v5.5.1 or later
Vendor Advisory: https://github.com/Bubka/2FAuth/security/advisories/GHSA-ph6w-q992-7qrx
Restart Required: Yes
Instructions:
1. Backup your 2FAuth database. 2. Update to 2FAuth v5.5.1 or later via git pull or package manager. 3. Run database migrations if required. 4. Restart the 2FAuth service.
🔧 Temporary Workarounds
Disable group deletion
allPrevent administrators from deleting groups while other operations are pending
Implement group deletion lock
allAdd manual locking mechanism before group deletion operations
🧯 If You Can't Patch
- Implement strict change control procedures for group management operations
- Monitor database for orphaned accounts and perform regular cleanup
🔍 How to Verify
Check if Vulnerable:
Check if running 2FAuth v5.5.0 by examining version in web interface or configuration filesCheck Version:
Check web interface or config/app.php for version informationVerify Fix Applied:
Verify version is v5.5.1 or later and test group deletion while other operations are pending📡 Detection & Monitoring
Log Indicators:
- Multiple simultaneous group operations in logs
- Database errors related to foreign key constraints
- Orphaned account references in audit logs
Network Indicators:
- Unusual pattern of group management API calls
SIEM Query:
source="2fauth" AND (operation="group_delete" OR error="foreign_key")