CVE-2024-4056
📋 TL;DR
CVE-2024-4056 is a denial-of-service vulnerability in M-Files Server that allows unauthenticated attackers to consume computing resources, potentially making the server unavailable. This affects M-Files Server versions after 23.11 (excluding 24.2 LTS) and before 24.4.13592.4. Organizations using vulnerable M-Files Server deployments are at risk.
💻 Affected Systems
- M-Files Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete service outage where M-Files Server becomes unresponsive, disrupting document management and business workflows for all users.
Likely Case
Degraded server performance causing slow response times, timeouts, and intermittent service interruptions.
If Mitigated
Minimal impact with proper network segmentation and rate limiting preventing resource exhaustion attacks.
🎯 Exploit Status
The vulnerability requires no authentication and appears to be relatively simple to exploit based on the CVSS score and description.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 24.4.13592.4
Vendor Advisory: https://product.m-files.com/security-advisories/cve-2024-4056/
Restart Required: Yes
Instructions:
1. Download M-Files Server version 24.4.13592.4 or later from the M-Files website. 2. Run the installer on the M-Files Server machine. 3. Follow the upgrade wizard instructions. 4. Restart the M-Files Server service after installation completes.
🔧 Temporary Workarounds
Network Segmentation
allRestrict access to M-Files Server to trusted networks only, preventing external attackers from reaching the vulnerable service.
Rate Limiting
allImplement rate limiting at the network perimeter or load balancer to prevent resource exhaustion attacks.
🧯 If You Can't Patch
- Implement strict network access controls to limit M-Files Server exposure to only necessary internal users
- Deploy web application firewall (WAF) rules to detect and block potential DoS attack patterns
🔍 How to Verify
Check if Vulnerable:
Check the M-Files Server version in the M-Files Admin tool under Server Administration > About. If version is between 23.11 and 24.4.13592.4 (excluding 24.2 LTS), the system is vulnerable.Check Version:
In M-Files Admin: Navigate to Server Administration > About to view versionVerify Fix Applied:
Verify the M-Files Server version shows 24.4.13592.4 or later in the Admin tool, and test server functionality under normal load.📡 Detection & Monitoring
Log Indicators:
- Unusual spike in resource consumption (CPU/memory)
- Multiple connection attempts from single IPs
- Server performance degradation alerts
Network Indicators:
- High volume of requests to M-Files Server ports (typically 2266)
- Traffic patterns suggesting resource exhaustion attacks
SIEM Query:
source="m-files-server" AND (event_type="performance_degradation" OR resource_usage>90%)