CVE-2025-34519

Executive Summary

CVE-2025-34519 identifies a critical security flaw in Ilevia EVE X1 Server firmware versions ≤ 4.7.18.0.eden. The vulnerability stems from the use of the MD5 hashing algorithm without a per-password salt for storing user credentials. This design weakness allows an attacker who gains access to the password database to efficiently recover plaintext passwords through offline dictionary, rainbow-table, or brute-force attacks. The vendor, Ilevia, has declined to issue a patch and recommends customers not expose port 8080 to the internet as a mitigation. This report provides a comprehensive technical analysis, detection methods, and remediation guidance.

CVSS Breakdown & Threat Level

• CVSS Score: 0.0 (NVD) / Adjusted Score: 7.5 (High) based on vector analysis.
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
• Attack Vector (AV): Network – The vulnerability is exploitable remotely.
• Attack Complexity (AC): Low – No special conditions required.
• Privileges Required (PR): None – No authentication needed to exploit the hashing weakness once the database is obtained.
• User Interaction (UI): None – No user action required.
• Scope (S): Unchanged – The vulnerable component is the only affected system.
• Confidentiality (C): High – Complete disclosure of password hashes.
• Integrity (I): None – No data modification.
• Availability (A): None – No denial of service.
• Threat Level: High – The use of unsalted MD5 makes password cracking trivial with modern hardware.

Deep Dive & Mechanics

The vulnerability lies in the authentication subsystem of the Ilevia EVE X1 Server firmware. The system stores user passwords using the MD5 hash function without applying a per-password salt. MD5 is a fast, deterministic hash algorithm, meaning the same password always produces the same hash. Without a salt, an attacker can precompute hash values for common passwords (rainbow tables) or use GPU-accelerated brute-force tools to crack hashes at rates exceeding billions per second.

Attack Flow:

1. Initial Access: The attacker gains access to the password database file (e.g., via SQL injection, file disclosure, or network exposure of port 8080).
2. Offline Cracking: The attacker extracts the MD5 hashes and uses tools like Hashcat or John the Ripper with wordlists (e.g., RockYou) or brute-force.
3. Credential Recovery: Plaintext passwords are recovered, enabling further lateral movement or privilege escalation.

The vendor’s recommendation to block port 8080 is a workaround, not a fix, as it does not address the underlying cryptographic weakness.

Vulnerable vs. Patched Code

Vulnerable Code (MD5 without salt):

import hashlib

def store_password(username, password):
    # Vulnerable: MD5 without salt
    hash_value = hashlib.md5(password.encode()).hexdigest()
    database[username] = hash_value

Patched Code (bcrypt with salt):

import bcrypt

def store_password(username, password):
    # Patched: bcrypt with automatic salt
    salt = bcrypt.gensalt()
    hash_value = bcrypt.hashpw(password.encode(), salt)
    database[username] = hash_value

The patched version uses bcrypt, which incorporates a random salt and is computationally expensive, making brute-force attacks impractical.

Exploitation & Lab Setup

Red Team (Offensive)

Lab Environment:

• Target: Ilevia EVE X1 Server firmware 4.7.18.0.eden
• Attacker: Kali Linux with Hashcat and John the Ripper

Steps:

1. Obtain Password Database: Exploit a separate vulnerability (e.g., directory traversal) to download /etc/shadow or equivalent database file.
2. Extract Hashes: Identify MD5 hashes (32-character hex strings).
3. Crack Hashes:

   hashcat -m 0 -a 0 hashes.txt /usr/share/wordlists/rockyou.txt
   

   • -m 0 specifies MD5.
   • -a 0 is dictionary attack.
4. Use Recovered Credentials: Log into the web interface on port 8080.

No public exploit code is available for this CVE.

Blue Team (Defensive)

Detection:

• Monitor for unusual access to password database files (e.g., /etc/shadow, passwd).
• Alert on high-volume login attempts from a single IP (brute-force indicator).
• Use the YARA and Sigma rules below.

Mitigation:

• Block port 8080 from the internet immediately.
• Implement network segmentation to isolate the EVE X1 Server.
• Enforce strong password policies and multi-factor authentication (MFA) if possible.

Indicators of Compromise (IOCs)

• File Hashes (MD5 of known vulnerable firmware): e3b0c44298fc1c149afbf4c8996fb924 (example – replace with actual hash if available)
• Network Indicators:
  • IP addresses scanning port 8080 on Ilevia devices.
  • Unusual outbound connections from the EVE X1 Server to unknown hosts.
• Log Entries:
  • Repeated failed login attempts in web server logs.
  • Access to /etc/shadow or database dump files.

Detection Engineering

YARA Rule

rule CVE_2025_34519_MD5_Hash_Storage
{
    meta:
        description = "Detects MD5 hash storage in Ilevia EVE X1 firmware"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-34519"
    strings:
        $md5_func = "hashlib.md5" nocase
        $md5_hex = /[a-f0-9]{32}/ 
        $password_var = "password" nocase
    condition:
        $md5_func and $password_var and #md5_hex > 5
}

Sigma Rule

title: CVE-2025-34519 - Unsalted MD5 Password Storage
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects attempts to access password database files on Ilevia EVE X1
author: Valters IT
logsource:
    category: process_creation
    product: linux
detection:
    selection:
        Image|endswith: '/cat'
        CommandLine|contains: '/etc/shadow'
    condition: selection
falsepositives:
    - Legitimate administrative access
level: high

Suricata Rule

alert tcp $EXTERNAL_NET any -> $HOME_NET 8080 (msg:"CVE-2025-34519 - Ilevia EVE X1 Port 8080 Access"; flow:to_server,established; content:"GET /"; http_method; content:"/login"; http_uri; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Block Port 8080: Use firewall rules to deny inbound traffic to port 8080 from the internet.
2. Change All Passwords: Force password reset for all users after blocking external access.
3. Network Segmentation: Place the EVE X1 Server on an isolated VLAN with strict access controls.

Long-Term Fix:

• Since Ilevia has declined to patch, consider replacing the device with a vendor that supports secure password hashing (e.g., bcrypt, Argon2).
• Implement a Web Application Firewall (WAF) in front of the device to filter malicious traffic.

Workaround:

• If replacement is not possible, use a reverse proxy (e.g., Nginx) to add authentication and rate limiting, and disable direct access to the device’s web interface.

Valters IT