CVE-2025-34245
📋 TL;DR
This SQL injection vulnerability in Advantech WebAccess/VPN allows authenticated low-privileged users to inject malicious SQL queries through datatable search parameters in the AjaxStandaloneVpnClientsController.ajaxAction() function. Successful exploitation leads to unauthorized disclosure of database information. Organizations running affected versions of Advantech WebAccess/VPN are impacted.
💻 Affected Systems
- Advantech WebAccess/VPN
📦 What is this software?
Webaccess\/vpn by Advantech
⚠️ Risk & Real-World Impact
Worst Case
Attackers could extract sensitive database information including user credentials, configuration data, and potentially gain administrative access to the VPN system.
Likely Case
Low-privileged authenticated users exfiltrate database contents, potentially accessing other users' information or system configuration data.
If Mitigated
With proper input validation and parameterized queries, the vulnerability would be prevented, maintaining normal system functionality.
🎯 Exploit Status
Exploitation requires authenticated access but only low privileges. SQL injection via search parameters is typically straightforward.
🛠️ 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 and data. 3. Install the update following vendor instructions. 4. Restart the WebAccess/VPN service.
🔧 Temporary Workarounds
Input Validation Filter
allImplement web application firewall rules or input validation to block SQL injection patterns in search parameters
Access Restriction
allRestrict access to the vulnerable endpoint to only trusted users or networks
🧯 If You Can't Patch
- Implement network segmentation to isolate the vulnerable system from sensitive databases
- Enable detailed logging and monitoring for SQL injection attempts on the affected endpoint
🔍 How to Verify
Check if Vulnerable:
Check the WebAccess/VPN version in the administration interface. If version is below 1.1.5, the system is vulnerable.Check Version:
Check via WebAccess/VPN web interface under System Information or Administration settingsVerify Fix Applied:
After patching, verify the version shows 1.1.5 or higher in the administration interface.📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in application logs
- Multiple failed login attempts followed by search parameter manipulation
- Database error messages containing SQL syntax
Network Indicators:
- Unusual database connection patterns from the WebAccess/VPN server
- Large data transfers from the database to unexpected sources
SIEM Query:
source="webaccess_vpn" AND (message="SQL" OR message="database" OR message="injection") AND severity=HIGH