CVE-2021-37254
📋 TL;DR
This vulnerability in M-Files Web allows remote attackers to access license key information for third-party components without authentication. It affects M-Files Web versions before 20.10.9524.1 and 20.10.9445.0. The exposure of license keys could enable further attacks or license misuse.
💻 Affected Systems
- M-Files Web
📦 What is this software?
M Files Web by M Files
M Files Web by M Files
⚠️ Risk & Real-World Impact
Worst Case
Attackers obtain license keys for third-party components, potentially enabling license misuse, software piracy, or as a stepping stone for further attacks against those components.
Likely Case
Unauthorized access to sensitive license information, which could be used for reconnaissance or to bypass licensing controls.
If Mitigated
Limited information disclosure with no direct system compromise if proper network segmentation and access controls are in place.
🎯 Exploit Status
The vulnerability description indicates unauthenticated access is possible, suggesting relatively straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 20.10.9524.1 or 20.10.9445.0
Vendor Advisory: https://www.m-files.com/about/trust-center/security-vulnerabilities/cve-2021-37254/
Restart Required: Yes
Instructions:
1. Download the patched version from M-Files customer portal. 2. Backup current installation. 3. Install the update following M-Files upgrade procedures. 4. Restart M-Files services.
🔧 Temporary Workarounds
Network Access Restriction
allRestrict network access to M-Files Web interface to trusted IP addresses only.
Configure firewall rules to limit access to M-Files Web ports (typically 80/443) from authorized networks only.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate M-Files Web from untrusted networks
- Deploy web application firewall (WAF) with rules to detect and block license key disclosure attempts
🔍 How to Verify
Check if Vulnerable:
Check M-Files Web version in administration console or via M-Files Server Management tool.Check Version:
Check M-Files Server version in M-Files Server Management console or via PowerShell: Get-MFServerVersionVerify Fix Applied:
Verify version is 20.10.9524.1 or 20.10.9445.0 or later in administration console.📡 Detection & Monitoring
Log Indicators:
- Unusual access patterns to license-related endpoints in M-Files Web logs
- Requests to license key endpoints from unauthorized IP addresses
Network Indicators:
- HTTP requests to license-related API endpoints from external sources
- Unusual traffic patterns to M-Files Web interface
SIEM Query:
source="m-files-web" AND (uri="*license*" OR uri="*key*") AND src_ip NOT IN [trusted_networks]🔗 References
- https://www.m-files.com/about/trust-center/security-vulnerabilities/cve-2021-37254/
- https://www.m-files.com/company/trust-center/vulnerability-disclosure/
- https://www.m-files.com/about/trust-center/security-vulnerabilities/cve-2021-37254/
- https://www.m-files.com/company/trust-center/vulnerability-disclosure/
