CVE-2023-4097
📋 TL;DR
This vulnerability allows authenticated attackers to upload arbitrary files to the affected application, potentially leading to remote code execution or system compromise. It affects IDM Sistemas QSIGE software users who have file upload functionality enabled. Attackers need valid credentials to exploit this flaw.
💻 Affected Systems
- IDM Sistemas QSIGE
📦 What is this software?
Qsige by Qsige
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment
Likely Case
Malicious file upload leading to web shell installation, data exfiltration, or lateral movement
If Mitigated
Limited impact with proper file type validation and execution restrictions in place
🎯 Exploit Status
Exploitation requires authentication but is straightforward once credentials are obtained
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in provided references
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-idm-sistemas-qsige
Restart Required: Yes
Instructions:
1. Contact IDM Sistemas for patched version 2. Apply vendor-provided patch 3. Restart application services 4. Verify fix implementation
🔧 Temporary Workarounds
Implement file type validation
allRestrict uploads to specific file extensions and validate file content
Restrict upload directory permissions
linuxSet upload directories to read-only for web server and prevent execution
chmod 644 /path/to/uploads/*
chown root:root /path/to/uploads
🧯 If You Can't Patch
- Disable file upload functionality entirely if not required
- Implement web application firewall rules to block suspicious upload patterns
🔍 How to Verify
Check if Vulnerable:
Test authenticated file upload with disallowed file types (e.g., .php, .exe) and check if they are acceptedCheck Version:
Check application version through admin interface or configuration filesVerify Fix Applied:
Attempt same file upload tests after patch and verify they are rejected📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads, especially executable files or scripts
- Multiple failed login attempts followed by successful uploads
Network Indicators:
- POST requests to upload endpoints with suspicious file extensions
- Unusual outbound connections from web server
SIEM Query:
source="web_logs" AND (uri="/upload" OR uri="/fileupload") AND (filename="*.php" OR filename="*.exe" OR filename="*.jsp")