CVE-2025-34244
📋 TL;DR
This SQL injection vulnerability in Advantech WebAccess/VPN allows authenticated low-privileged users to inject malicious SQL queries through datatable search parameters. Successful exploitation can lead to unauthorized disclosure of sensitive database information. Organizations using Advantech WebAccess/VPN versions prior to 1.1.5 are affected.
💻 Affected Systems
- Advantech WebAccess/VPN
📦 What is this software?
Webaccess\/vpn by Advantech
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise including credential theft, configuration data exfiltration, and potential lateral movement to other systems.
Likely Case
Unauthorized access to sensitive database information such as user credentials, device configurations, and network data.
If Mitigated
Limited impact with proper network segmentation, database permissions, and monitoring in place.
🎯 Exploit Status
Exploitation requires authenticated access but with low privileges
🛠️ 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 official website. 2. Backup current configuration. 3. Apply the update following vendor instructions. 4. Restart the service/application.
🔧 Temporary Workarounds
Input Validation Enhancement
allImplement strict input validation for datatable search parameters
Not applicable - requires code changes
Database Permission Restriction
allRestrict database user permissions to minimum required
GRANT SELECT ON specific_tables TO application_user;
REVOKE EXECUTE, INSERT, UPDATE, DELETE FROM application_user;
🧯 If You Can't Patch
- Implement WAF rules to block SQL injection patterns in AjaxFwRulesController requests
- Restrict network access to the WebAccess/VPN interface to trusted users only
🔍 How to Verify
Check if Vulnerable:
Check application version in admin interface or configuration filesCheck Version:
Check via admin web interface or application configuration filesVerify Fix Applied:
Verify version is 1.1.5 or later and test search functionality with SQL injection payloads📡 Detection & Monitoring
Log Indicators:
- Unusual database queries from application user
- Multiple failed login attempts followed by SQL-like search patterns
- Long or unusual search parameter strings in web logs
Network Indicators:
- SQL keywords in HTTP POST parameters to AjaxFwRulesController endpoints
- Unusual database connection patterns from application server
SIEM Query:
source="web_access_logs" AND (uri="*AjaxFwRulesController*" AND (param="*SELECT*" OR param="*UNION*" OR param="*OR 1=1*"))