CVE-2025-34242
📋 TL;DR
Advantech WebAccess/VPN versions before 1.1.5 contain a SQL injection vulnerability in the AjaxNetworkController.ajaxAction() function. Authenticated low-privileged users can exploit this via datatable search parameters to extract database information. This affects organizations using vulnerable Advantech VPN portal software.
💻 Affected Systems
- Advantech WebAccess/VPN
📦 What is this software?
Webaccess\/vpn by Advantech
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise including sensitive configuration data, user credentials, network information, and potential lateral movement to connected systems.
Likely Case
Unauthorized access to database tables containing user information, network configurations, and system logs.
If Mitigated
Limited information disclosure from non-sensitive database tables if proper input validation and least privilege are enforced.
🎯 Exploit Status
Exploitation requires authenticated access but low privilege; SQL injection via search parameters is well-understood.
🛠️ 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 from Advantech's website. 2. Backup current configuration. 3. Apply the update following vendor instructions. 4. Restart the VPN portal service.
🔧 Temporary Workarounds
Input Validation Filter
allImplement web application firewall or input validation to block SQL injection patterns in search parameters.
Database Permission Restriction
allRestrict database user permissions to read-only for application accounts where possible.
🧯 If You Can't Patch
- Implement network segmentation to isolate VPN portal from sensitive databases.
- Enforce strict authentication controls and monitor for unusual search parameter patterns.
🔍 How to Verify
Check if Vulnerable:
Check if Advantech WebAccess/VPN version is below 1.1.5 via admin interface or version files.Check Version:
Check admin dashboard or consult vendor documentation for version verification.Verify Fix Applied:
Confirm version is 1.1.5 or higher and test search functionality with SQL injection test patterns.📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in application logs
- Multiple rapid search requests with special characters
- Database error messages containing SQL syntax
Network Indicators:
- HTTP POST requests to AjaxNetworkController with SQL-like parameters in search fields
SIEM Query:
source="webaccess_logs" AND (url="*AjaxNetworkController*" AND params="*SELECT* OR *UNION* OR *--*")