CVE-2025-68543

Executive Summary

CVE-2025-68543 is a critical PHP Local File Inclusion (LFI) vulnerability affecting the Diza WordPress theme by Thembay, up to and including version 1.3.15. 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 achieving remote code execution if combined with file upload capabilities. The CVSS score of 8.1 (High) reflects the ease of exploitation and the high impact on confidentiality. As a WordPress ecosystem issue, this vulnerability does not affect Apache or Nginx directly but is a flaw within the theme's PHP code.

Supply Chain & Package Security

This vulnerability is specific to the Diza WordPress theme, which is distributed via the WordPress theme repository and third-party marketplaces. Users who installed the theme from untrusted sources may be at higher risk. No official patch has been released by Thembay as of the latest analysis. Organizations should verify the integrity of their theme installation and consider replacing it with a patched alternative if available.

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 low attack complexity and lack of authentication make this a prime target for automated scanning and exploitation.

Deep Dive & Mechanics

The vulnerability exists in the Diza theme's PHP code, likely within a function that dynamically includes template files or other resources based on user-supplied input. The include() or require() statement in PHP does not properly sanitize the filename parameter, allowing path traversal sequences (e.g., ../) to escape the intended directory.

Example vulnerable code pattern:

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

An attacker can supply ../../../../etc/passwd%00 to read arbitrary files (null byte injection may be required in older PHP versions, but modern PHP versions are still vulnerable to path traversal without null bytes).

The attack vector is typically through a GET or POST parameter that controls which file is included. Since the theme is part of WordPress, the vulnerable endpoint might be accessible via wp-content/themes/diza/ or through a WordPress AJAX action.

Vulnerable vs. Patched Code

Vulnerable Code (<= 1.3.15):

function diza_load_template($template_name) {
    $template_path = get_template_directory() . '/templates/' . $template_name . '.php';
    if (file_exists($template_path)) {
        include($template_path);
    }
}
// Called with user input from $_GET['template']
diza_load_template($_GET['template']);

Patched Code (Hypothetical):

function diza_load_template($template_name) {
    // Whitelist allowed templates
    $allowed_templates = array('header', 'footer', 'sidebar');
    if (!in_array($template_name, $allowed_templates)) {
        return;
    }
    $template_path = get_template_directory() . '/templates/' . basename($template_name) . '.php';
    if (file_exists($template_path)) {
        include($template_path);
    }
}

The patched version uses a whitelist and basename() to prevent directory traversal.

Exploitation & Lab Setup

Red Team

Prerequisites:

• A WordPress installation with Diza theme version <= 1.3.15.
• Knowledge of the vulnerable parameter (e.g., template, file, include).

Exploitation Steps:

1. Identify the vulnerable endpoint. Common patterns:
   • http://target/wp-content/themes/diza/template-loader.php?template=../../../../etc/passwd
   • http://target/?diza_template=../../../../etc/passwd
2. Use path traversal to read sensitive files:
   • /etc/passwd (Linux user enumeration)
   • /etc/nginx/nginx.conf or /etc/apache2/apache2.conf (server config)
   • wp-config.php (database credentials)
3. For PHP file inclusion, if you can upload a malicious PHP file (e.g., via another plugin), include it to achieve RCE.

Example curl command:

curl -v "http://target/wp-content/themes/diza/template-loader.php?template=../../../../etc/passwd"

Blue Team

Detection:

• Monitor web server logs for path traversal patterns (e.g., ../, %2e%2e%2f).
• Look for requests to theme files with unexpected parameters.
• Use the Sigma rule below to detect suspicious include attempts.

Hunting:

• Search for include or require calls in the Diza theme code that use unsanitized user input.
• Check for file inclusion attempts in access logs:

  grep -E '(\.\./|%2e%2e%2f)' /var/log/nginx/access.log | grep 'diza'
  

Indicators of Compromise (IOCs)

• File Paths:
  • /wp-content/themes/diza/template-loader.php
  • /wp-content/themes/diza/includes/loader.php
• URL Patterns:
  • ?template=../../../../etc/passwd
  • ?diza_template=../../../../wp-config.php
• Log Entries:
  • GET /wp-content/themes/diza/template-loader.php?template=..%2f..%2f..%2f..%2fetc%2fpasswd
• Network Indicators:
  • Outbound connections from the web server to external IPs (if RCE is achieved).

Detection Engineering

YARA Rule

rule CVE_2025_68543_Diza_LFI {
    meta:
        description = "Detects attempts to exploit CVE-2025-68543 in Diza theme"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-68543"
    strings:
        $path_traversal = /(\.\.\/|%2e%2e%2f|%252e%252e%252f)/
        $diza_param = /(template|diza_template|file)=/
    condition:
        $path_traversal and $diza_param
}

Sigma Rule

title: CVE-2025-68543 Diza Theme LFI Attempt
id: 8a4b3c2d-1e5f-4a7b-9c8d-0e1f2a3b4c5d
status: experimental
description: Detects HTTP requests attempting to exploit PHP Local File Inclusion in Diza theme
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
    service: access
detection:
    selection:
        cs-method: 'GET'
        cs-uri-query|contains: 
            - 'template=..'
            - 'diza_template=..'
            - 'file=..'
        cs-uri-query|contains: 
            - '/wp-content/themes/diza/'
    condition: selection
falsepositives:
    - Legitimate use of path traversal in other contexts (rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-68543 Diza Theme LFI Attempt"; flow:to_server,established; content:"/wp-content/themes/diza/"; http_uri; content:"template="; http_uri; content:"../"; http_uri; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the Diza theme until a patch is available. Switch to a default WordPress theme (e.g., Twenty Twenty-Four).
2. Implement a Web Application Firewall (WAF) rule to block path traversal patterns in requests to the Diza theme directory.
3. Restrict file permissions on sensitive files (e.g., wp-config.php should be readable only by the web server user).

Long-term Fix:

• Thembay must release a patched version that sanitizes user input using whitelisting or basename().
• If no patch is forthcoming, consider replacing the theme with a secure alternative.

Detection:

• Deploy the Sigma and Suricata rules provided above.
• Monitor for anomalous file inclusion attempts in web server logs.

Valters IT Signature:

Valters IT
Cybersecurity & Threat Intelligence
https://valters-it.com