CVE-2025-34246
📋 TL;DR
Advantech WebAccess/VPN versions before 1.1.5 contain a SQL injection vulnerability in the AjaxPrevalidationController.ajaxAction() function. Authenticated low-privileged users can exploit this via datatable search parameters to extract database information. Organizations using vulnerable Advantech WebAccess/VPN installations are affected.
💻 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 information leading to complete system takeover.
Likely Case
Disclosure of database contents including user information, configuration details, and potentially authentication data.
If Mitigated
Limited information disclosure if proper input validation and database permissions are enforced.
🎯 Exploit Status
Exploitation requires authenticated access but uses common SQL injection techniques.
🛠️ 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 support portal. 2. Backup current configuration. 3. Install the update following vendor documentation. 4. Restart the service/application.
🔧 Temporary Workarounds
Input Validation Filter
allImplement input validation for datatable search parameters to block SQL injection attempts.
Not applicable - requires code modification
Database Permission Restriction
allLimit database user permissions to prevent data extraction via SQL injection.
Not applicable - requires database configuration
🧯 If You Can't Patch
- Implement network segmentation to isolate vulnerable systems from critical assets.
- Deploy web application firewall (WAF) with SQL injection detection rules.
🔍 How to Verify
Check if Vulnerable:
Check WebAccess/VPN version in administration interface or configuration files.Check Version:
Check application interface or consult vendor documentation for version verification.Verify Fix Applied:
Confirm version is 1.1.5 or later in administration interface.📡 Detection & Monitoring
Log Indicators:
- Unusual database queries from AjaxPrevalidationController
- Multiple failed SQL injection attempts in web logs
Network Indicators:
- Suspicious POST requests to AjaxPrevalidationController with SQL-like parameters
SIEM Query:
web_access_logs WHERE url CONTAINS 'AjaxPrevalidationController' AND parameters CONTAINS ['SELECT', 'UNION', 'OR', '--']