CVE-2019-17403
📋 TL;DR
Nokia IMPACT IoT platform versions before 18A contain an unrestricted file upload vulnerability that allows attackers to upload malicious files. This can lead to remote code execution on affected systems. Organizations using Nokia IMPACT IoT platform versions before 18A are affected.
💻 Affected Systems
- Nokia IMPACT IoT Platform
📦 What is this software?
Impact by Nokia
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attacker to execute arbitrary code, steal sensitive data, pivot to other systems, and maintain persistent access.
Likely Case
Attacker gains shell access to the server, installs backdoors, exfiltrates IoT device data and credentials, and potentially disrupts IoT operations.
If Mitigated
File uploads are blocked or properly validated, limiting attacker to denial of service at most through resource exhaustion.
🎯 Exploit Status
File upload vulnerabilities are typically easy to exploit with publicly available tools. The CWE-434 classification indicates unrestricted upload of dangerous file types.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 18A and later
Vendor Advisory: https://www.nokia.com/networks/solutions/impact-iot-platform/
Restart Required: Yes
Instructions:
1. Backup current configuration and data. 2. Download Nokia IMPACT version 18A or later from Nokia support portal. 3. Follow Nokia's upgrade documentation to apply the patch. 4. Restart the IMPACT services. 5. Verify the upgrade was successful.
🔧 Temporary Workarounds
Web Application Firewall (WAF) Rules
allImplement WAF rules to block file uploads to vulnerable endpoints and detect malicious file types.
File Upload Restrictions
linuxConfigure web server to restrict file uploads to specific directories with strict permissions and validate file types server-side.
# Example nginx location block to restrict uploads
location /upload {
deny all;
}
🧯 If You Can't Patch
- Isolate the Nokia IMPACT system in a segmented network with strict firewall rules limiting inbound connections.
- Implement network-based intrusion detection to monitor for file upload attempts and shell execution patterns.
🔍 How to Verify
Check if Vulnerable:
Check the Nokia IMPACT version via the web interface or by examining installed packages. Versions before 18A are vulnerable.Check Version:
# Check installed Nokia IMPACT version
rpm -qa | grep -i impact
# Or check web interface at https://<impact-server>/adminVerify Fix Applied:
Verify the version is 18A or later and test file upload functionality with restricted file types to ensure proper validation.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to IMPACT endpoints
- Execution of unexpected processes from web directories
- Web server errors related to file upload validation
Network Indicators:
- HTTP POST requests with file uploads to IMPACT endpoints
- Outbound connections from IMPACT server to unknown IPs
SIEM Query:
source="web_server" AND (uri_path="/upload" OR uri_path="/fileupload") AND http_method="POST" AND content_type="multipart/form-data"