CVE-2025-34247
📋 TL;DR
Advantech WebAccess/VPN versions before 1.1.5 contain a SQL injection vulnerability in the NetworksController.addNetworkAction() function. Authenticated low-privileged users can exploit this via datatable search parameters to extract database information. This affects organizations using vulnerable Advantech VPN portal installations.
💻 Affected Systems
- Advantech WebAccess/VPN
📦 What is this software?
Webaccess\/vpn by Advantech
⚠️ Risk & Real-World Impact
Worst Case
Full database compromise including credentials, configuration data, and sensitive network information leading to lateral movement and complete system takeover.
Likely Case
Disclosure of database contents including user information, network configurations, and potentially credential hashes that could be cracked offline.
If Mitigated
Limited information disclosure from database tables accessible to the application's database user account.
🎯 Exploit Status
SQL injection via search parameters is a well-understood attack vector. Requires authenticated access but low privileges are sufficient.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.1.5
Vendor Advisory: https://icr.advantech.com/support/router-models/download/511/sa-2025-01-vpn-portal-2025-11-06.pdf
Restart Required: Yes
Instructions:
1. Download version 1.1.5 or later from https://icr.advantech.com/download/software
2. Backup current configuration and database
3. Install the update following vendor documentation
4. Restart the VPN portal service
5. Verify successful update and functionality
🔧 Temporary Workarounds
Input Validation Filter
allImplement web application firewall or input validation to block SQL injection patterns in search parameters
Database User Privilege Reduction
allReduce database account privileges to minimum required for application functionality
🧯 If You Can't Patch
- Implement network segmentation to isolate VPN portal from sensitive systems
- Enable detailed logging and monitoring for SQL injection attempts in application logs
🔍 How to Verify
Check if Vulnerable:
Check Advantech WebAccess/VPN version in administration interface. If version is below 1.1.5, system is vulnerable.Check Version:
Check via Advantech WebAccess/VPN web interface administration panel or consult vendor documentation for CLI version check.Verify Fix Applied:
Verify version is 1.1.5 or higher in administration interface and test search functionality with SQL injection payloads to confirm they are blocked.📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in database logs
- Multiple failed login attempts followed by search parameter manipulation
- Application logs showing SQL syntax errors
Network Indicators:
- Unusual database connection patterns from VPN portal
- HTTP requests containing SQL keywords in search parameters
SIEM Query:
source="advantech_vpn" AND ("SELECT" OR "UNION" OR "INSERT" OR "UPDATE" OR "DELETE") AND "search"