CVE-2023-2480
📋 TL;DR
This vulnerability in M-Files Client allows UI extension applications to bypass access permission checks, enabling privilege escalation. Attackers could gain unauthorized access to sensitive documents or system functions. Affects M-Files Client users running vulnerable versions before 23.5.12598.0.
💻 Affected Systems
- M-Files Client
📦 What is this software?
M Files by M Files
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of M-Files system with unauthorized access to all documents, administrative functions, and potential lateral movement within the network.
Likely Case
Unauthorized access to sensitive documents and data that should be restricted based on user permissions.
If Mitigated
Limited impact with proper network segmentation, least privilege access, and monitoring in place.
🎯 Exploit Status
Requires user interaction with malicious UI extension application. No authentication bypass - requires some level of access to deploy/execute UI extensions.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 23.5.12598.0 or later
Vendor Advisory: https://empower.m-files.com/security-advisories/CVE-2023-2480
Restart Required: Yes
Instructions:
1. Download M-Files Client version 23.5.12598.0 or later from official M-Files sources. 2. Run the installer with administrative privileges. 3. Restart the system after installation completes. 4. Verify the update was successful.
🔧 Temporary Workarounds
Restrict UI Extension Deployment
windowsLimit deployment of UI extension applications to trusted sources only and implement approval processes for new extensions.
Network Segmentation
allSegment M-Files Client systems from critical infrastructure and implement strict firewall rules.
🧯 If You Can't Patch
- Implement strict access controls and monitor for unusual UI extension deployment
- Enforce least privilege principle and regularly audit user permissions in M-Files
🔍 How to Verify
Check if Vulnerable:
Check M-Files Client version in Help > About. If version is below 23.5.12598.0 and not 23.2 SR2 or newer, system is vulnerable.Check Version:
Check Help > About in M-Files Client GUI or examine installed programs in Windows Control PanelVerify Fix Applied:
Verify version is 23.5.12598.0 or higher in Help > About menu.📡 Detection & Monitoring
Log Indicators:
- Unusual UI extension deployment logs
- Permission escalation attempts in M-Files audit logs
- Unexpected access to restricted documents
Network Indicators:
- Unusual network traffic from M-Files Client to unauthorized systems
- Suspicious file transfers from M-Files
SIEM Query:
EventID=4688 AND ProcessName LIKE '%M-Files%' AND CommandLine CONTAINS 'extension' OR EventID=4663 AND ObjectName LIKE '%M-Files%' AND AccessMask IN ('Write', 'FullControl')