CVE-2025-60739

Executive Summary

CVE-2025-60739 is a Cross-Site Request Forgery (CSRF) vulnerability identified in the Ilevia EVE X1 Server Firmware, specifically in versions up to and including v4.7.18.0.eden, with Logic Version v6.00 - 2025_07_21. This vulnerability allows a remote attacker to execute arbitrary code by exploiting the /bh_web_backend component. The lack of CSRF tokens or proper origin validation in the backend endpoint enables an attacker to craft malicious requests that, when triggered by an authenticated user, can perform unauthorized actions on the server, potentially leading to full system compromise. The vulnerability is classified under MITRE ATT&CK Tactic T1190 (Exploit Public-Facing Application) and CWE-352 (Cross-Site Request Forgery). No public proof-of-concept (PoC) or exploit code is currently available, and the patch status remains unknown.

Supply Chain & Package Security

This vulnerability is not related to NPM, PyPI, Go, or Ruby packages. It is a firmware-level issue in the Ilevia EVE X1 Server, which is a hardware appliance. Therefore, supply chain package security analysis is not applicable.

CVSS Breakdown & Threat Level

The CVSS score is listed as 0.0, which is likely a placeholder or uncalculated. Based on the vulnerability description and typical CSRF characteristics, a reasonable CVSS v3.1 vector would be:

• Attack Vector (AV): Network (N) – The attack can be launched remotely.
• Attack Complexity (AC): Low (L) – No special conditions are required.
• Privileges Required (PR): None (N) – The attacker does not need authentication.
• User Interaction (UI): Required (R) – The victim must click a link or visit a malicious page.
• Scope (S): Unchanged (U) – The vulnerable component and the attacker's scope are the same.
• Confidentiality (C): High (H) – Arbitrary code execution can lead to data exfiltration.
• Integrity (I): High (H) – Arbitrary code execution can modify system state.
• Availability (A): High (H) – Arbitrary code execution can disrupt services.

Estimated CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Estimated Base Score: 8.8 (High)

Threat Level: High. The vulnerability allows remote code execution with low attack complexity, though user interaction is required. The lack of a patch increases the risk for unpatched systems.

Deep Dive & Mechanics

The vulnerability resides in the /bh_web_backend component of the Ilevia EVE X1 Server firmware. This component likely handles backend API requests for the web interface. The absence of CSRF protection means that the server does not validate whether a request originated from a legitimate user session or a malicious third-party site.

Attack Flow:

1. An attacker crafts a malicious HTML page or script that sends a forged HTTP request to the /bh_web_backend endpoint.
2. The attacker lures an authenticated user (e.g., an administrator) to visit the malicious page.
3. The victim's browser automatically sends the forged request, including any session cookies (if not properly secured with SameSite or HttpOnly flags).
4. The server processes the request as if it came from the legitimate user, executing arbitrary code or performing unauthorized actions.

Root Cause: The /bh_web_backend endpoint does not implement CSRF tokens, origin/referer header validation, or other anti-CSRF mechanisms. This allows cross-origin requests to be processed without verification.

Impact: Successful exploitation can lead to full system compromise, including data theft, configuration changes, firmware modification, or denial of service.

Vulnerable vs. Patched Code

Since no patch is available, a comparison cannot be made. However, a typical fix would involve:

Vulnerable Code (Conceptual):

# No CSRF protection
@app.route('/bh_web_backend', methods=['POST'])
def handle_request():
    data = request.form
    # Process request without validation
    execute_command(data['command'])
    return 'OK'

Patched Code (Conceptual):

import secrets

# Generate and validate CSRF token
@app.route('/bh_web_backend', methods=['POST'])
def handle_request():
    token = request.form.get('csrf_token')
    if not token or token != session.get('csrf_token'):
        return 'CSRF validation failed', 403
    data = request.form
    execute_command(data['command'])
    return 'OK'

# On login, generate token
@app.route('/login', methods=['POST'])
def login():
    # ... authentication ...
    session['csrf_token'] = secrets.token_hex(32)
    return 'Logged in'

Exploitation & Lab Setup

Red Team

Lab Setup:

• Target: Ilevia EVE X1 Server with firmware v4.7.18.0.eden (or earlier).
• Attacker machine: Kali Linux or similar.
• Victim machine: Browser with authenticated session to the target.

Exploitation Steps:

1. Identify the target IP and ensure the web interface is accessible.
2. Craft a malicious HTML page that sends a POST request to /bh_web_backend with arbitrary parameters (e.g., to execute a command).
3. Host the page on an attacker-controlled server.
4. Send a phishing link to an authenticated user (e.g., via email or social engineering).
5. When the user visits the page, the CSRF attack executes.

Example Malicious HTML:

<html>
<body>
<form action="http://target-ip/bh_web_backend" method="POST">
  <input type="hidden" name="command" value="reboot" />
  <input type="submit" value="Click me" />
</form>
<script>
  document.forms[0].submit();
</script>
</body>
</html>

Note: No public exploit code is available. The above is a conceptual example.

Blue Team

Detection:

• Monitor for unusual POST requests to /bh_web_backend from unexpected origins.
• Check for missing Referer or Origin headers in requests.
• Analyze web server logs for repeated requests from the same IP with different session tokens.

Prevention:

• Implement CSRF tokens in all state-changing requests.
• Validate the Origin and Referer headers.
• Use SameSite cookies (e.g., SameSite=Strict or Lax).
• Educate users about phishing attacks.

Indicators of Compromise (IOCs)

• Network IOCs:

  • POST requests to /bh_web_backend with suspicious parameters (e.g., command, exec, shell).
  • Requests with missing or spoofed Referer headers.
  • Unusual outbound connections from the EVE X1 server to unknown IPs.

• Host IOCs:

  • Unexpected processes or services running on the server.
  • Modified configuration files in /etc/ or firmware directories.
  • New user accounts or unauthorized SSH keys.

• Log IOCs:

  • Web server logs showing repeated POST requests to /bh_web_backend from different IPs.
  • Authentication logs showing unusual activity after a CSRF attack.

Detection Engineering

YARA Rule

rule CVE_2025_60739_CSRF_Exploit {
    meta:
        description = "Detects CSRF exploit attempts against Ilevia EVE X1 /bh_web_backend"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-60739"
    strings:
        $csrf_endpoint = "/bh_web_backend"
        $csrf_method = "POST"
        $csrf_param = "command"
    condition:
        $csrf_endpoint and $csrf_method and $csrf_param
}

Sigma Rule

title: CSRF Exploit Attempt Against Ilevia EVE X1
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects POST requests to /bh_web_backend with potential CSRF payloads
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-stem: '/bh_web_backend'
    condition: selection
falsepositives:
    - Legitimate administrative actions
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-60739 CSRF Exploit Attempt"; flow:to_server; http.method; content:"POST"; http.uri; content:"/bh_web_backend"; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Isolate affected devices: If possible, disconnect the EVE X1 server from untrusted networks or place it behind a firewall with strict access controls.
2. Disable the /bh_web_backend endpoint: If not required, block access to this endpoint via web server configuration or firewall rules.
3. Implement CSRF protection: Add CSRF tokens to all forms and validate them on the server side. Alternatively, validate the Origin and Referer headers.
4. Use SameSite cookies: Set the SameSite attribute to Strict or Lax for session cookies.
5. Monitor logs: Enable detailed logging for the web server and review for suspicious activity.

Long-term Actions:

1. Apply firmware patch: Contact Ilevia for an official patch or update to a non-vulnerable version.
2. Conduct security audit: Perform a thorough security review of the firmware and web interface.
3. User education: Train administrators to recognize phishing attempts and avoid clicking suspicious links while logged into the device.

Workaround: If patching is not possible, restrict access to the web interface to trusted IPs only using firewall rules.

Valters IT