CVE-2025-15225

Executive Summary

CVE-2025-15225 is an Arbitrary File Read vulnerability in Sunnet WMPro, a web management application. The flaw allows unauthenticated remote attackers to exploit Relative Path Traversal (CWE-23) to read arbitrary system files. No CVSS score, EPSS data, or public exploit code is available at this time. The vendor has not released a patch, leaving systems exposed to potential information disclosure.

Supply Chain & Package Security

This vulnerability is not associated with NPM, PyPI, Go, or Ruby packages. It affects a proprietary application (Sunnet WMPro) and is not part of a public software supply chain.

CVSS Breakdown & Threat Level

• CVSS Score: 0.0 (No vector assigned)
• Attack Vector (AV): Network (unauthenticated remote)
• Attack Complexity (AC): Low (path traversal is straightforward)
• Privileges Required (PR): None
• User Interaction (UI): None
• Scope (S): Unchanged
• Confidentiality (C): High (arbitrary file read)
• Integrity (I): None
• Availability (A): None
• Threat Level: High (due to unauthenticated access and no patch)

Deep Dive & Mechanics

The vulnerability resides in WMPro's file handling logic. The application fails to sanitize user-supplied input used to construct file paths. By injecting relative path traversal sequences (e.g., ../), an attacker can escape the intended web root directory and read sensitive files such as configuration files, credentials, or system files.

Root Cause: The application uses user input directly in file read operations without proper validation or canonicalization.

Attack Vector: HTTP requests to endpoints that accept file paths (e.g., /download?file=... or /view?path=...).

Impact: Unauthorized disclosure of sensitive data, potentially leading to further compromise.

Vulnerable vs. Patched Code

Vulnerable Code (Conceptual):

# Vulnerable: Direct use of user input
def read_file(file_path):
    with open(file_path, 'r') as f:
        return f.read()

# Attacker sends: /read?file=../../../etc/passwd

Patched Code (Conceptual):

import os

# Patched: Validate and restrict path
def read_file(file_path):
    base_dir = "/var/www/wmpro/files"
    # Resolve and check path
    full_path = os.path.realpath(os.path.join(base_dir, file_path))
    if not full_path.startswith(base_dir):
        raise PermissionError("Access denied")
    with open(full_path, 'r') as f:
        return f.read()

Exploitation & Lab Setup

Red Team

Lab Setup:

1. Deploy Sunnet WMPro in a controlled environment (e.g., Docker container).
2. Identify endpoints that accept file parameters (e.g., /download, /view, /getfile).

Exploitation Steps:

1. Send a crafted request to read /etc/passwd:

   curl "http://target/wmpro/download?file=../../../etc/passwd"
   

2. Attempt to read application configuration files:

   curl "http://target/wmpro/view?path=../../../var/www/wmpro/config.php"
   

3. Use automated tools like Burp Suite or custom scripts to enumerate accessible files.

Note: No public exploit code is available; this is a conceptual demonstration.

Blue Team

Detection:

• Monitor for path traversal patterns in HTTP requests (e.g., ../, ..\\, %2e%2e%2f).
• Alert on attempts to access sensitive files (e.g., /etc/passwd, config.php).

Hunting:

• Search web server logs for requests containing ../ or encoded variants.
• Correlate with file access logs to identify unauthorized reads.

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP requests with path traversal sequences (../, ..\\, %2e%2e%2f)
  • Requests to endpoints like /download, /view, /getfile with suspicious parameters
• File IOCs:
  • Unauthorized access to /etc/passwd, /etc/shadow, application config files
• Log IOCs:
  • Web server logs showing 404 or 200 responses for path traversal attempts

Detection Engineering

YARA Rule

rule CVE_2025_15225_WMPro_PathTraversal {
    meta:
        description = "Detects path traversal attempts targeting Sunnet WMPro"
        author = "Valters IT"
        date = "2025-04-10"
        cve = "CVE-2025-15225"
    strings:
        $traversal1 = "../"
        $traversal2 = "..\\"
        $traversal3 = "%2e%2e%2f"
        $traversal4 = "%2e%2e/"
        $sensitive1 = "/etc/passwd"
        $sensitive2 = "/etc/shadow"
        $sensitive3 = "config.php"
    condition:
        any of ($traversal*) and any of ($sensitive*)
}

Sigma Rule

title: Sunnet WMPro Path Traversal Attempt
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects HTTP requests with path traversal patterns targeting WMPro
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'GET'
        cs-uri-query|contains:
            - '../'
            - '..\\'
            - '%2e%2e%2f'
            - '%2e%2e/'
    condition: selection
falsepositives:
    - Legitimate use of relative paths in some applications
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-15225 Sunnet WMPro Path Traversal Attempt"; flow:to_server,established; content:"../"; http_uri; nocase; content:"/etc/"; http_uri; nocase; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Isolate WMPro instances from untrusted networks (e.g., place behind VPN or firewall).
2. Implement Web Application Firewall (WAF) rules to block path traversal patterns.
3. Monitor logs for exploitation attempts.

Long-Term Fix:

• Vendor Patch: Await official patch from Sunnet. If unavailable, consider replacing WMPro with a supported alternative.
• Code Fix: If source code is accessible, implement input validation and canonicalization as shown in the patched code example.

Workaround:

• Restrict file read endpoints to authenticated users only (if possible).
• Use a reverse proxy to sanitize requests before they reach WMPro.

Valters IT
Senior DevSecOps & Cyber Threat Intelligence Expert