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The CVE-2025-34242 vulnerability is a SQL injection flaw in Advantech WebAccess/VPN versions prior to 1.1.5. It specifically exists in the AjaxNetworkController.ajaxAction() function that handles AJAX requests. When processing datatable search parameters, user input is not properly validated or sanitized before being incorporated into SQL queries. An authenticated low-privileged observer user can inject malicious SQL code via the search parameters. This allows the attacker to manipulate database queries by embedding commands such as UNION SELECT or conditional statements. The injected SQL is executed directly on the backend database due to concatenation of user input into SQL strings. This vulnerability stems from the lack of parameterized queries or input escaping mechanisms. Attackers can exploit this to bypass application logic and access unauthorized data. By crafting specific search terms, sensitive information like user credentials, configuration details, and database schemas can be extracted. The exploitation requires network access to the web interface and a valid user account, but with minimal permissions. The flaw highlights insecure coding practices where trust is placed in user-controlled data without verification. Successful exploitation leads to full disclosure of database contents, compromising confidentiality. It can also serve as an initial entry point for further attacks, such as privilege escalation or data manipulation. The vulnerability is particularly dangerous because it leverages common web functionality often exposed to users. Mitigation involves updating to the patched version and implementing secure coding standards. The issue was addressed in version 1.1.5 by adding proper input validation and using prepared statements. This prevents the injection of SQL commands through search parameters. Overall, this CVE demonstrates the risks associated with improper handling of user input in web applications.
Platform: Advantech WebAccess/VPN
Version: Before version 1.1.5
Vulnerability: SQL injection
Severity: Critical
Date: 11/06/2025
Prediction: Patched in 1.1.5
What Undercode Say:
Analytics:
bash: curl -X POST -H “Cookie: sessionid=authenticated” -d “search=1′ UNION SELECT user,password,NULL FROM users–” https://target/ajax/network-controller
code: // Vulnerable code snippet: String query = “SELECT FROM network WHERE name LIKE ‘%” + searchParam + “%’;”;
How Exploit:
Authenticated user injects SQL via datatable search parameters in AjaxNetworkController.ajaxAction() requests, extracting database information through malicious payloads.
Protection from this CVE:
Update to version 1.1.5, use parameterized queries, implement input validation, and restrict user privileges.
Impact:
Unauthorized database information disclosure, credential theft, and potential system compromise.
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Sources:
Reported By: nvd.nist.gov
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