CVE-2023-50256
📋 TL;DR
This vulnerability in Froxlor server administration software allows attackers to bypass mandatory field validation during user registration by submitting blank username and password fields. This affects all Froxlor installations prior to version 2.1.2, potentially enabling unauthorized account creation.
💻 Affected Systems
- Froxlor
📦 What is this software?
Froxlor by Froxlor
⚠️ Risk & Real-World Impact
Worst Case
Attackers create administrative accounts with blank credentials, gaining full control over the Froxlor instance and potentially the underlying server infrastructure.
Likely Case
Unauthorized users create accounts with minimal privileges, potentially leading to resource exhaustion, spam accounts, or foothold for further attacks.
If Mitigated
With proper network segmentation and monitoring, impact is limited to the Froxlor application layer with no lateral movement.
🎯 Exploit Status
Video demonstration shows simple form submission with blank fields. No special tools required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.1.2
Vendor Advisory: https://github.com/Froxlor/Froxlor/security/advisories/GHSA-625g-fm5w-w7w4
Restart Required: No
Instructions:
1. Backup your Froxlor installation and database. 2. Update to Froxlor 2.1.2 via package manager or manual download. 3. Run any database migrations if prompted. 4. Verify registration form validation works correctly.
🔧 Temporary Workarounds
Disable User Registration
allTemporarily disable new user registration functionality in Froxlor settings
Edit Froxlor configuration to set 'allow_register' to false
Web Application Firewall Rule
allBlock registration requests with empty username or password fields
Add WAF rule to reject POST requests to registration endpoint with empty username/password parameters
🧯 If You Can't Patch
- Implement rate limiting on registration endpoint to prevent mass exploitation
- Monitor authentication logs for suspicious registration attempts with unusual patterns
🔍 How to Verify
Check if Vulnerable:
Attempt to register a new user with blank username and password fields. If registration succeeds, system is vulnerable.Check Version:
php /path/to/froxlor/lib/classes/froxlor/Froxlor.php --versionVerify Fix Applied:
Attempt same registration test. System should reject blank credentials and display validation errors.📡 Detection & Monitoring
Log Indicators:
- Registration attempts with empty username/password fields
- Successful registrations with minimal or unusual data
Network Indicators:
- HTTP POST requests to registration endpoint with empty parameters
- Unusual registration patterns from single IPs
SIEM Query:
source="froxlor.log" AND ("register" OR "registration") AND (username="" OR password="")🔗 References
- https://github.com/Froxlor/Froxlor/commit/4b1846883d4828962add91bd844596d89a9c7cac
- https://github.com/Froxlor/Froxlor/security/advisories/GHSA-625g-fm5w-w7w4
- https://user-images.githubusercontent.com/80028768/289675319-81ae8ebe-1308-4ee3-bedb-43cdc40da474.mp4
- https://github.com/Froxlor/Froxlor/commit/4b1846883d4828962add91bd844596d89a9c7cac
- https://github.com/Froxlor/Froxlor/security/advisories/GHSA-625g-fm5w-w7w4
- https://user-images.githubusercontent.com/80028768/289675319-81ae8ebe-1308-4ee3-bedb-43cdc40da474.mp4
