CVE-2025-59932
📋 TL;DR
This vulnerability in Flag Forge CTF platform allows unauthenticated attackers to create, modify, or delete platform resources via the /api/resources endpoint. It affects all deployments running versions 2.0.0 through 2.3.0. The issue stems from missing authentication and authorization checks on POST and DELETE requests.
💻 Affected Systems
- Flag Forge CTF Platform
📦 What is this software?
Flagforge by Flagforge
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the CTF platform where attackers can delete all resources, create malicious content, or modify challenges to disrupt competitions and potentially gain unauthorized access to sensitive data.
Likely Case
Unauthorized modification or deletion of CTF challenges, flags, and resources leading to competition disruption, data loss, and potential score manipulation.
If Mitigated
Limited impact if proper network segmentation and authentication controls are in place, though the vulnerability still exposes the API endpoint.
🎯 Exploit Status
Simple HTTP requests to the vulnerable endpoint can exploit this. No authentication required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.3.1
Vendor Advisory: https://github.com/FlagForgeCTF/flagForge/security/advisories/GHSA-v8rh-25rf-gfqw
Restart Required: Yes
Instructions:
1. Backup your current Flag Forge installation and database. 2. Update to version 2.3.1 via git pull or package update. 3. Restart the Flag Forge service. 4. Verify the fix by testing API authentication.
🔧 Temporary Workarounds
Web Application Firewall Rule
allBlock POST and DELETE requests to /api/resources endpoint at the WAF or reverse proxy level
# Example nginx location block
location /api/resources {
limit_except GET {
deny all;
}
}
Network Access Control
linuxRestrict access to the Flag Forge API endpoint to trusted IP addresses only
# Example iptables rule
sudo iptables -A INPUT -p tcp --dport [FLAGFORGE_PORT] -s [TRUSTED_IP] -j ACCEPT
sudo iptables -A INPUT -p tcp --dport [FLAGFORGE_PORT] -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation to isolate the Flag Forge instance from untrusted networks
- Deploy a web application firewall with rules to block unauthorized POST/DELETE requests to /api/resources
🔍 How to Verify
Check if Vulnerable:
Send a POST or DELETE request to /api/resources endpoint without authentication. If it succeeds, the system is vulnerable.Check Version:
Check package.json or run: grep version /path/to/flagforge/package.jsonVerify Fix Applied:
Attempt the same POST/DELETE requests after patching. They should return 401 Unauthorized or 403 Forbidden.📡 Detection & Monitoring
Log Indicators:
- Unauthorized POST/DELETE requests to /api/resources endpoint
- 401/403 errors for API requests after patching
- Unexpected resource creation/deletion in application logs
Network Indicators:
- POST/DELETE requests to /api/resources from untrusted sources
- Unusual API traffic patterns
SIEM Query:
source="flagforge" AND (method="POST" OR method="DELETE") AND uri="/api/resources" AND response_code!=401 AND response_code!=403