CVE-2025-12550

Executive Summary

CVE-2025-12550 is a critical PHP Local File Inclusion (LFI) vulnerability affecting the OchaHouse WordPress theme by jwsthemes, up to and including version 2.2.8. The vulnerability stems from improper control of a filename used in an include/require statement, allowing an unauthenticated attacker to include arbitrary local files from the server. This can lead to sensitive information disclosure, such as reading configuration files containing database credentials, or potentially enabling further exploitation like remote code execution if combined with file upload capabilities. The CVSS score of 8.1 (High) reflects the ease of exploitation and high confidentiality impact. As of this report, no official patch is available, and no public proof-of-concept exploit has been released.

Supply Chain & Package Security

This vulnerability resides in a WordPress theme distributed via the official WordPress theme repository and potentially through third-party marketplaces. Users who have installed the OchaHouse theme are at risk. Since the theme is part of the WordPress ecosystem, the supply chain risk is moderate; however, the lack of a patch means users must rely on manual mitigation or removal of the theme.

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) – The vulnerable component and the impacted component are the same.
• Confidentiality (C): High (H) – Full file read access.
• Integrity (I): None (N) – No file modification.
• Availability (A): None (N) – No denial of service.

Threat Level: High. The vulnerability is trivial to exploit and can lead to severe data breaches.

Deep Dive & Mechanics

The vulnerability is a classic PHP Local File Inclusion (LFI) arising from the use of user-supplied input in a PHP include() or require() statement without proper sanitization. In the OchaHouse theme, a parameter (likely page, template, or similar) is passed to a file inclusion function. An attacker can manipulate this parameter to include arbitrary files from the server, such as /etc/passwd or WordPress configuration files (wp-config.php).

The core issue is the lack of a whitelist or path validation. The theme likely does something like:

include($_GET['template'] . '.php');

An attacker can use path traversal sequences (e.g., ../../../../etc/passwd%00) to escape the intended directory and include sensitive files. The null byte injection (%00) may be used to truncate the .php extension in older PHP versions, though modern PHP versions may require different techniques like using wrappers (e.g., php://filter).

Vulnerable vs. Patched Code

Since no patch is available, we can only hypothesize the vulnerable code pattern and the required fix.

Vulnerable Code (Hypothetical):

<?php
// In a template loader function
$template = $_GET['template'];
include( get_template_directory() . '/templates/' . $template . '.php' );
?>

Patched Code (Recommended):

<?php
// Whitelist allowed templates
$allowed_templates = array('home', 'single', 'page', 'archive');
$template = $_GET['template'];
if ( in_array( $template, $allowed_templates ) ) {
    include( get_template_directory() . '/templates/' . $template . '.php' );
} else {
    // Default template or error
    include( get_template_directory() . '/templates/page.php' );
}
?>

The fix involves validating the input against a whitelist of allowed values, preventing any arbitrary file inclusion.

Exploitation & Lab Setup

Red Team (Attacker)

Lab Setup:

1. Install a WordPress instance with the OchaHouse theme (version <= 2.2.8).
2. Ensure the server is accessible over the network.

Exploitation Steps:

1. Identify the vulnerable parameter (e.g., template, page, file). This can be done by reviewing the theme's source code or through fuzzing.
2. Craft a request to include a sensitive file:

   GET /?template=../../../../etc/passwd HTTP/1.1
   Host: target.com
   

3. If the server returns the contents of /etc/passwd, the vulnerability is confirmed.
4. For more impactful exploitation, read wp-config.php to obtain database credentials:

   GET /?template=../../../../wp-config HTTP/1.1
   

   (Note: The .php extension may be appended automatically; use null byte or path truncation if needed.)

Advanced Techniques:

• Use PHP wrappers to read files without extension issues:

  GET /?template=php://filter/convert.base64-encode/resource=../../../../wp-config HTTP/1.1
  

• If file upload is possible, combine LFI with file upload to achieve Remote Code Execution (RCE).

Blue Team (Defender)

Detection:

• Monitor web server logs for suspicious GET parameters containing path traversal sequences (../, ..\\, %2e%2e%2f).
• Look for requests to the theme's template loader with unusual parameters.
• Alert on requests attempting to read sensitive files like wp-config.php, .env, or /etc/passwd.

Mitigation:

• Immediately disable or remove the OchaHouse theme if no patch is available.
• Implement a Web Application Firewall (WAF) rule to block path traversal attempts.
• Apply virtual patching by modifying the theme's code to whitelist allowed templates (as shown in the patched code section).

Indicators of Compromise (IOCs)

• Network IOCs:

  • HTTP requests with template, page, or file parameters containing ../ or ..\\.
  • Requests to paths like /wp-content/themes/ochahouse/ with suspicious query strings.
  • Base64-encoded payloads in the query string (e.g., php://filter/convert.base64-encode/resource=).

• File System IOCs:

  • Unexpected inclusion of files like /etc/passwd, /etc/shadow, or wp-config.php in web server logs.
  • Presence of temporary files or logs indicating file read attempts.

• Log IOCs:

  • Web server access logs showing 200 OK responses for requests targeting sensitive files.
  • PHP error logs showing warnings about failed includes or open_basedir restrictions.

Detection Engineering

YARA Rule

rule CVE_2025_12550_OchaHouse_LFI {
    meta:
        description = "Detects attempts to exploit CVE-2025-12550 in OchaHouse WordPress theme"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2025-12550"
    strings:
        $path_traversal = /(\.\.\/|\.\.\\){2,}/
        $sensitive_file = /(wp-config|etc\/passwd|etc\/shadow|\.env)/
        $php_wrapper = /php:\/\/filter/
    condition:
        any of ($path_traversal) and any of ($sensitive_file) or any of ($php_wrapper)
}

Sigma Rule

title: CVE-2025-12550 OchaHouse LFI Detection
id: 8a3f7c2e-5b1d-4a9e-8c6f-2d3e4f5a6b7c
status: experimental
description: Detects HTTP requests attempting to exploit LFI in OchaHouse theme
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
    service: access
detection:
    selection:
        cs-method: 'GET'
        cs-uri-query|contains:
            - '../'
            - '..\\'
            - '%2e%2e%2f'
            - 'php://filter'
            - 'wp-config'
            - '/etc/passwd'
    condition: selection
falsepositives:
    - Legitimate use of path traversal in other applications (rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-12550 OchaHouse LFI Attempt"; flow:to_server,established; content:"GET"; http_method; content:"../"; http_uri; nocase; content:"wp-config"; http_uri; nocase; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the OchaHouse theme and switch to a default WordPress theme (e.g., Twenty Twenty-Four) until a patch is available.
2. Apply virtual patching via WAF rules to block path traversal patterns.
3. Review server logs for any signs of exploitation.

Long-Term Fix:

• The vendor (jwsthemes) must release a patched version that implements input validation and whitelisting for template files.
• Users should monitor the WordPress theme repository for updates and apply them immediately.

Compensating Controls:

• Restrict file permissions on sensitive files (e.g., wp-config.php should be readable only by the web server user).
• Enable open_basedir in PHP to limit file access to specific directories.
• Use a security plugin like Wordfence to add an extra layer of protection.

Valters IT
Securing Digital Frontiers