CVE-2025-34516

Executive Summary

CVE-2025-34516 is a critical vulnerability in Ilevia EVE X1 Server firmware versions ≤ 4.7.18.0.eden. The issue stems from the use of default credentials, allowing an unauthenticated attacker to gain remote access to the device. The vendor, Ilevia, has declined to patch this vulnerability and recommends that customers not expose port 8080 to the internet. This advisory is based on the NVD data and enriched hacker intel, which indicates no public exploit code or proof-of-concept is currently available. The vulnerability is classified under CWE-798 (Use of Hard-coded Credentials) and maps to MITRE ATT&CK tactic T1190 (Exploit Public-Facing Application). The CVSS score is 10.0 (Critical) due to the network attack vector, low attack complexity, no privileges required, and no user interaction needed, with high impact on confidentiality, integrity, and availability.

CVSS Breakdown & Threat Level

• CVSS Score: 10.0 (Critical)
• Attack Vector (AV): Network (N) – The vulnerability can be exploited remotely over the network.
• Attack Complexity (AC): Low (L) – No special conditions or complex attack sequences are required.
• Privileges Required (PR): None (N) – The attacker does not need any prior authentication.
• User Interaction (UI): None (N) – No user action is required for exploitation.
• Scope (S): Unchanged (U) – The vulnerable component and the impacted component are the same.
• Confidentiality (C): High (H) – Full disclosure of all data on the device.
• Integrity (I): High (H) – Complete compromise of data integrity.
• Availability (A): High (H) – Full loss of availability, potentially leading to denial of service.

The threat level is critical due to the ease of exploitation and the potential for full device compromise. The lack of a patch and the vendor's refusal to address the issue further elevates the risk.

Deep Dive & Mechanics

The vulnerability is a classic case of hard-coded credentials. The Ilevia EVE X1 Server firmware includes default usernames and passwords that are not changed during initial setup. An unauthenticated attacker can use these credentials to log in to the device's web interface (typically exposed on port 8080) and gain administrative access. Once inside, the attacker can execute arbitrary commands, modify configurations, exfiltrate data, or use the device as a pivot point for further network attacks.

The root cause is the lack of a forced password change mechanism and the absence of secure credential management. The vendor's recommendation to not expose port 8080 to the internet is a workaround, not a fix, and does not address internal network threats.

Vulnerable vs. Patched Code

Since no patch is available, there is no patched code to compare. The vulnerable code is the firmware itself, which contains hard-coded credentials. A hypothetical patch would involve removing default credentials, implementing a secure password policy, and requiring users to set a unique password during initial setup.

Exploitation & Lab Setup

Red Team

Lab Setup:

1. Deploy an Ilevia EVE X1 Server with firmware version ≤ 4.7.18.0.eden.
2. Ensure the device is accessible on the network (e.g., IP 192.168.1.100).
3. Use a tool like curl or a web browser to access the web interface on port 8080.

Exploitation Steps:

1. Identify the default credentials (e.g., admin/admin or root/root). These are typically documented in the device manual or can be guessed.
2. Use the following command to attempt login:

   curl -X POST http://192.168.1.100:8080/login -d "username=admin&password=admin"
   

3. If successful, the response will contain a session token or redirect to the admin dashboard.
4. Once authenticated, explore the device's functionality to execute commands or extract data.

Note: No public exploit code is available, so this is a manual exploitation scenario.

Blue Team

Detection:

• Monitor for multiple failed login attempts on port 8080.
• Look for successful logins from unusual IP addresses or at odd hours.
• Check for changes in device configuration or unexpected outbound connections.

Hunting:

• Search logs for the use of default usernames (e.g., admin, root, user).
• Analyze network traffic for patterns indicative of brute-force attacks.

Indicators of Compromise (IOCs)

• Network:
  • Unauthorized access to port 8080 on Ilevia EVE X1 devices.
  • Multiple failed login attempts from a single IP.
  • Successful login from an IP not in the authorized list.
• Host:
  • Presence of default credentials in use.
  • Unusual processes or services running on the device.
  • Modified configuration files.
• File:
  • Log entries showing login with default usernames.

Detection Engineering

YARA Rule

rule CVE_2025_34516_Ilevia_Default_Creds {
    meta:
        description = "Detects Ilevia EVE X1 firmware with default credentials"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-34516"
    strings:
        $cred1 = "admin:admin" ascii wide
        $cred2 = "root:root" ascii wide
        $cred3 = "user:user" ascii wide
    condition:
        any of them
}

Sigma Rule

title: Ilevia EVE X1 Default Credential Login
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects successful login attempts using default credentials on Ilevia EVE X1
author: Valters IT
date: 2025-04-10
logsource:
    category: application
    product: web
detection:
    selection:
        http_method: POST
        url_path: /login
        body: "username=admin&password=admin"
    condition: selection
falsepositives:
    - Legitimate administrative actions during initial setup
level: high

Suricata Rule

alert tcp any any -> any 8080 (msg:"CVE-2025-34516 Ilevia EVE X1 Default Credential Attempt"; flow:to_server,established; content:"POST"; http_method; content:"/login"; http_uri; content:"username=admin&password=admin"; http_client_body; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

Since no patch is available, the following mitigations are recommended:

1. Network Segmentation: Isolate Ilevia EVE X1 devices on a separate VLAN with strict access controls.
2. Firewall Rules: Block inbound access to port 8080 from untrusted networks, including the internet.
3. Change Default Credentials: If possible, change the default credentials via the device's configuration interface (if supported).
4. Monitor Logs: Enable logging and monitor for suspicious activity.
5. Vendor Communication: Pressure Ilevia to release a security update or provide a workaround.
6. Consider Replacement: If the device is critical and cannot be secured, consider replacing it with a supported alternative.

Valters IT
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