CVE-2025-0417

Executive Summary

CVE-2025-0417 identifies a critical security weakness in Valmet DNA visualization within the DNA Operate product. The vulnerability stems from a complete lack of rate limiting on login attempts, enabling an attacker to perform brute-force password guessing without any throttling. Successful exploitation could allow an adversary to gain unauthorized access to the industrial control system (ICS) interface and perform switching operations, potentially disrupting critical infrastructure processes. This issue is particularly severe in OT/ICS environments where authentication is the primary barrier to operational commands.

Supply Chain & Package Security

This vulnerability is not related to open-source packages (NPM, PyPI, Go, Ruby) but is a proprietary industrial control system component. The risk is amplified by the lack of a vendor patch and the sensitive nature of the systems involved.

CVSS Breakdown & Threat Level

While no official CVSS vector is provided, a reasonable assessment based on the description is:

• Attack Vector (AV): Network (likely remote access to the DNA Operate interface)
• Attack Complexity (AC): Low (no special conditions required)
• Privileges Required (PR): None (attacker does not need prior access)
• User Interaction (UI): None (attack can be automated)
• Scope (S): Unchanged
• Confidentiality (C): High (access to operational data)
• Integrity (I): High (ability to perform switching operations)
• Availability (A): Low (switching operations could disrupt availability)

Estimated CVSS Score: 8.1 (High) – based on AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

Threat Level: Critical for OT environments. The lack of rate limiting combined with the ability to perform switching operations makes this a high-priority target for threat actors targeting industrial control systems.

Deep Dive & Mechanics

The vulnerability exists in the authentication mechanism of Valmet DNA visualization, a component of the DNA Operate suite used for monitoring and controlling industrial processes. The core issue is the absence of any rate-limiting or account lockout mechanism on the login endpoint. This allows an attacker to:

1. Enumerate valid usernames: By observing response times or error messages, an attacker can identify valid accounts.
2. Brute-force passwords: Without rate limiting, an attacker can attempt thousands of passwords per minute against a known username.
3. Gain unauthorized access: Once credentials are guessed, the attacker can log in with the privileges of the compromised account.
4. Perform switching operations: The attacker can then issue commands to change the state of industrial equipment (e.g., open/close valves, start/stop pumps), potentially causing physical damage or safety incidents.

The attack surface is the login interface exposed by the DNA Operate web application or client-server component. The lack of protection is a classic CWE-307 (Improper Restriction of Excessive Authentication Attempts) vulnerability.

Vulnerable vs. Patched Code

Since no patch is available, a comparison cannot be made. However, the vulnerable code would be the authentication handler that accepts login requests without checking the frequency of attempts from a single source. A patched version would implement:

• Rate limiting: Track failed attempts per IP address and username, and introduce delays or lockouts after a threshold.
• Account lockout: Temporarily disable an account after a set number of failed attempts.
• CAPTCHA or challenge-response: Require additional verification after a few failed attempts.

Exploitation & Lab Setup

Red Team

Objective: Demonstrate brute-force attack to gain access to DNA Operate.

Prerequisites:

• Target system running Valmet DNA Operate with the vulnerable component.
• Network access to the login interface (e.g., http://<target>:<port>/login).
• A list of potential usernames (e.g., admin, operator, engineer).

Exploitation Steps:

1. Identify Login Endpoint: Use a web browser or tool like Burp Suite to find the login form.
2. Capture Login Request: Intercept a login attempt to see the parameters (e.g., username, password).
3. Automate Brute-Force: Use a tool like Hydra or a custom Python script to send login requests rapidly.

Example Python Script (for educational purposes only):

import requests

target_url = "http://<target>:<port>/login"
usernames = ["admin", "operator", "engineer"]
passwords = ["password123", "admin", "123456", "letmein"]

for user in usernames:
    for pwd in passwords:
        data = {"username": user, "password": pwd}
        response = requests.post(target_url, data=data)
        if "Login failed" not in response.text:
            print(f"[+] Success: {user}:{pwd}")
            break

Expected Outcome: The script will eventually guess a valid credential due to the lack of rate limiting.

Blue Team

Objective: Detect and mitigate brute-force attacks against DNA Operate.

Detection:

• Monitor for a high volume of failed login attempts from a single IP address.
• Look for repeated login requests to the same endpoint with different passwords.
• Use network monitoring to identify patterns of rapid authentication requests.

Mitigation (until vendor patch):

• Implement a Web Application Firewall (WAF) or reverse proxy with rate limiting rules.
• Enable account lockout policies if the application supports it (check vendor documentation).
• Restrict network access to the DNA Operate interface to trusted IPs only.
• Use multi-factor authentication (MFA) if supported.

Indicators of Compromise (IOCs)

• Network IOCs:
  • High volume of HTTP POST requests to /login or similar endpoint from a single IP.
  • Repeated 401 Unauthorized responses followed by a 200 OK (successful login).
  • Unusual login times (e.g., outside business hours).
• System IOCs:
  • Multiple failed login events in application logs.
  • New user sessions from unexpected IP addresses.
  • Unauthorized switching operations in the system logs.

Detection Engineering

YARA Rule

rule Detect_Valmet_BruteForce_Attempts {
    meta:
        description = "Detects brute-force login attempts against Valmet DNA Operate"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-0417"
    strings:
        $login_endpoint = "/login" nocase
        $failed_login = "Login failed" nocase
        $success_login = "Welcome" nocase
    condition:
        #login_endpoint > 10 and #failed_login > 5
}

Sigma Rule

title: Brute Force Login Attempts Against Valmet DNA Operate
id: 8a9b3c2d-1e4f-5a6b-7c8d-9e0f1a2b3c4d
status: experimental
description: Detects multiple failed login attempts to Valmet DNA Operate login endpoint
author: Valters IT
logsource:
    category: application
    product: valmet_dna_operate
detection:
    selection:
        EventID: 4625  # Windows failed logon event (if applicable)
        TargetUserName: "*"
        LogonType: 3  # Network logon
    condition: selection | count(TargetUserName) by SourceIp > 10 within 5 minutes
falsepositives:
    - Legitimate password changes
    - Automated scripts
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"CVE-2025-0417 - Valmet DNA Operate Brute Force Attempt"; flow:to_server; content:"POST"; http_method; content:"/login"; http_uri; pcre:"/Login failed/R"; threshold: type both, track by_src, count 10, seconds 300; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Isolate the System: If possible, disconnect the DNA Operate interface from untrusted networks (e.g., the internet). Place it behind a firewall with strict access controls.
2. Implement Network-Level Rate Limiting: Use a reverse proxy (e.g., Nginx, HAProxy) or WAF to limit the number of login attempts per IP address.
3. Enable Account Lockout: If the application supports it, configure account lockout after a small number of failed attempts (e.g., 5 attempts within 15 minutes).
4. Monitor Logs: Actively monitor authentication logs for signs of brute-force attacks.

Long-Term Actions:

1. Contact Valmet: Request a security patch or workaround from the vendor.
2. Upgrade: When a patched version becomes available, upgrade immediately.
3. Implement MFA: Deploy multi-factor authentication for all user accounts.
4. Conduct Security Audit: Review the entire Valmet DNA deployment for other potential vulnerabilities.

Valters IT
Senior DevSecOps & Cyber Threat Intelligence Expert