CVE-2025-46268

Executive Summary

CVE-2025-46268 is a SQL injection vulnerability in Advantech WebAccess/SCADA, a widely used industrial control system (ICS) platform. The flaw allows an unauthenticated remote attacker to execute arbitrary SQL commands against the backend database, potentially leading to data exfiltration, credential theft, or further compromise of the SCADA environment. With a CVSS score of 6.3 (Medium), the vulnerability is serious due to the critical nature of SCADA systems in industrial operations. No public proof-of-concept (PoC) or patch is currently available, increasing the risk for unpatched deployments.

CVSS Breakdown & Threat Level

• CVSS Score: 6.3 (Medium)
• Attack Vector: Network (AV:N)
• Attack Complexity: Low (AC:L)
• Privileges Required: None (PR:N)
• User Interaction: None (UI:N)
• Scope: Unchanged (S:U)
• Confidentiality Impact: Low (C:L)
• Integrity Impact: Low (I:L)
• Availability Impact: Low (A:L)

The medium severity reflects the potential for data compromise but limited direct impact on system availability. However, in an ICS context, even low integrity impact can lead to unsafe control states.

Deep Dive & Mechanics

The vulnerability resides in the WebAccess/SCADA web interface, likely in a parameter that is unsafely concatenated into SQL queries. The application fails to sanitize user-supplied input before using it in database operations, allowing an attacker to inject SQL statements. Typical injection points include login forms, search fields, or API endpoints that interact with the backend database (e.g., Microsoft SQL Server or MySQL). Successful exploitation can lead to:

• Extraction of user credentials and session tokens.
• Manipulation of SCADA configuration data.
• Potential pivot to internal OT networks.

Vulnerable vs. Patched Code

Since no patch is available, a generic vulnerable code pattern is shown:

Vulnerable (Python/Flask example):

@app.route('/api/getdata', methods=['GET'])
def get_data():
    user_input = request.args.get('id')
    query = f"SELECT * FROM devices WHERE id = '{user_input}'"
    cursor.execute(query)
    return cursor.fetchall()

Patched (Parameterized query):

@app.route('/api/getdata', methods=['GET'])
def get_data():
    user_input = request.args.get('id')
    query = "SELECT * FROM devices WHERE id = ?"
    cursor.execute(query, (user_input,))
    return cursor.fetchall()

Exploitation & Lab Setup

Red Team

Lab Setup:

1. Deploy Advantech WebAccess/SCADA in a virtualized environment (e.g., VMware or VirtualBox) with default configurations.
2. Identify injection points using a web vulnerability scanner (e.g., Burp Suite, sqlmap).
3. Use sqlmap to automate exploitation:

   sqlmap -u "http://target:5040/WebAccess/login?user=admin&pass=test" --batch --dbs
   

4. Extract database contents:

   sqlmap -u "http://target:5040/WebAccess/login?user=admin&pass=test" --batch -D scada_db --tables
   

Note: No public exploit code is available; the above is a generic approach.

Blue Team

Detection & Response:

• Monitor for anomalous SQL queries in database logs (e.g., SELECT * FROM users).
• Deploy WAF rules to block SQL injection patterns (e.g., ' OR 1=1--).
• Isolate WebAccess/SCADA from the internet and restrict access via VPN.
• Enable logging and alerting on failed login attempts and unusual database activity.

Indicators of Compromise (IOCs)

• Network: SQL injection payloads in HTTP requests (e.g., ' OR '1'='1, UNION SELECT).
• Logs: Database error messages containing SQL syntax errors.
• Files: Unexpected database dumps or temporary files in web directories.
• Processes: Unusual database queries from the WebAccess service account.

Detection Engineering

YARA Rule

rule CVE_2025_46268_SQLi_Detection {
    meta:
        description = "Detects SQL injection attempts targeting Advantech WebAccess/SCADA"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-46268"
    strings:
        $sqli1 = /'.*OR.*1=1/i
        $sqli2 = /'.*UNION.*SELECT/i
        $sqli3 = /'.*DROP.*TABLE/i
        $sqli4 = /'.*EXEC.*xp_cmdshell/i
    condition:
        any of them
}

Sigma Rule

title: SQL Injection Attempt Against Advantech WebAccess/SCADA
id: 8a9b3c2d-1e5f-4a7b-9c8d-0e1f2a3b4c5d
status: experimental
description: Detects SQL injection patterns in HTTP requests to WebAccess/SCADA
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        c-uri|contains:
            - "' OR '1'='1"
            - "UNION SELECT"
            - "DROP TABLE"
            - "xp_cmdshell"
    condition: selection
falsepositives:
    - Legitimate use of special characters in search fields
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-46268 SQL Injection Attempt"; flow:to_server; content:"' OR '1'='1"; nocase; sid:1000001; rev:1;)
alert http any any -> any any (msg:"CVE-2025-46268 SQL Injection Attempt"; flow:to_server; content:"UNION SELECT"; nocase; sid:1000002; rev:1;)
alert http any any -> any any (msg:"CVE-2025-46268 SQL Injection Attempt"; flow:to_server; content:"DROP TABLE"; nocase; sid:1000003; rev:1;)

Remediation & Mitigation

• Immediate: Disable unnecessary web interfaces and restrict access to trusted IPs only.
• Short-term: Apply input validation and parameterized queries if source code access is available.
• Long-term: Monitor vendor advisories for an official patch. Consider migrating to a supported SCADA platform if no patch is released.
• Compensating Controls: Deploy a Web Application Firewall (WAF) with SQL injection rules, enable database activity monitoring, and implement network segmentation.

Valters IT
Securing Industrial Environments