CVE-2025-67565

Executive Summary

CVE-2025-67565 is a medium-severity information disclosure vulnerability affecting the Rehub WordPress theme by Sizam, up to and including version 19.9.9.1. The flaw allows an unauthenticated attacker to retrieve embedded sensitive system information, such as database credentials, API keys, or internal configuration data, from the theme’s files or exposed endpoints. This exposure can lead to further reconnaissance and targeted attacks against the WordPress instance and its underlying infrastructure.

As a WordPress ecosystem vulnerability, this issue does not stem from Apache or Nginx but from the theme’s insecure handling of sensitive data. No public proof-of-concept (PoC) or exploit code is available at this time, and the vendor has not released a patch.

Supply Chain & Package Security

This vulnerability affects a commercial WordPress theme distributed via marketplaces like ThemeForest. Users must monitor official channels for updates. No open-source package (NPM, PyPI, Go, Ruby) is involved.

CVSS Breakdown & Threat Level

• CVSS Score: 5.3 (Medium)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
• Attack Vector: Network
• Attack Complexity: Low
• Privileges Required: None
• User Interaction: None
• Scope: Unchanged
• Confidentiality Impact: Low (exposure of sensitive system information)
• Integrity Impact: None
• Availability Impact: None

Threat Level: Medium. While the direct impact is limited to information disclosure, the exposed data can be leveraged for privilege escalation or lateral movement.

Deep Dive & Mechanics

The vulnerability resides in the Rehub theme’s handling of AJAX endpoints or template files that expose system information without proper authorization. Specifically, the theme may include debug logs, configuration dumps, or database credentials in publicly accessible files (e.g., wp-content/themes/rehub/config.php or via a REST API endpoint). An unauthenticated attacker can send a crafted HTTP request to retrieve this data.

Root Cause: The theme fails to restrict access to sensitive files or endpoints that output system information (e.g., phpinfo(), database connection strings, or environment variables). This is a classic CWE-200 (Exposure of Sensitive Information) issue.

Attack Flow:

1. Attacker identifies a WordPress site running Rehub theme.
2. Attacker probes for known sensitive endpoints (e.g., /wp-content/themes/rehub/debug.php or /wp-json/rehub/v1/config).
3. Server returns sensitive data (e.g., DB_USER, DB_PASSWORD, API_KEY).
4. Attacker uses this data to access the database or other services.

Vulnerable vs. Patched Code

Since no patch is available, the vulnerable code is presumed to be in theme files that output sensitive data without authentication. A patched version would implement access controls or remove such endpoints.

Vulnerable Example (hypothetical):

// In rehub-theme/includes/config.php
function rehub_get_config() {
    return json_encode([
        'db_host' => DB_HOST,
        'db_user' => DB_USER,
        'db_pass' => DB_PASSWORD,
        'api_key' => get_option('rehub_api_key')
    ]);
}
add_action('rest_api_init', function () {
    register_rest_route('rehub/v1', '/config', [
        'methods' => 'GET',
        'callback' => 'rehub_get_config',
        'permission_callback' => '__return_true' // No auth check
    ]);
});

Patched Example (hypothetical):

// In rehub-theme/includes/config.php
function rehub_get_config() {
    if (!current_user_can('manage_options')) {
        return new WP_Error('rest_forbidden', 'Unauthorized', ['status' => 401]);
    }
    return json_encode([
        'db_host' => DB_HOST,
        'db_user' => DB_USER,
        'db_pass' => DB_PASSWORD,
        'api_key' => get_option('rehub_api_key')
    ]);
}
add_action('rest_api_init', function () {
    register_rest_route('rehub/v1', '/config', [
        'methods' => 'GET',
        'callback' => 'rehub_get_config',
        'permission_callback' => function () {
            return current_user_can('manage_options');
        }
    ]);
});

Exploitation & Lab Setup

Red Team (Exploitation)

Lab Setup:

• WordPress 6.x with Rehub theme 19.9.9.1 installed.
• Attacker machine with curl or Burp Suite.

Exploitation Steps:

1. Enumerate the target WordPress site:

   curl -s http://target.com/wp-content/themes/rehub/readme.txt | grep "Version"
   

2. Probe for sensitive endpoints:

   curl -s http://target.com/wp-json/rehub/v1/config
   curl -s http://target.com/wp-content/themes/rehub/debug.php
   

3. If successful, extract credentials or API keys from the response.

No public exploit code is available. The above is a hypothetical exploitation based on the vulnerability description.

Blue Team (Detection & Response)

Detection:

• Monitor for requests to /wp-json/rehub/v1/config or /wp-content/themes/rehub/debug.php.
• Alert on unusual access to theme files not typically requested by users.

Response:

• Immediately block the IP address making such requests.
• Review server logs for data exfiltration.
• Disable the vulnerable endpoint via a custom plugin or .htaccess rule:

  <IfModule mod_rewrite.c>
  RewriteEngine On
  RewriteRule ^wp-json/rehub/v1/config - [F,L]
  </IfModule>
  

Indicators of Compromise (IOCs)

• Network IOCs:

  • HTTP requests to /wp-json/rehub/v1/config
  • HTTP requests to /wp-content/themes/rehub/debug.php
  • Outbound connections from the WordPress server to unknown IPs containing sensitive data in the request body.

• File IOCs:

  • Presence of debug.php or config.php in the theme directory with sensitive data.
  • Modified .htaccess files allowing access to restricted directories.

• Log IOCs:

  • Repeated 200 responses for the above endpoints from a single IP.
  • Error logs showing PHP Notice: Undefined index in theme files.

Detection Engineering

YARA Rule

rule CVE_2025_67565_Rehub_InfoDisclosure {
    meta:
        description = "Detects Rehub theme files exposing sensitive system information"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-67565"
    strings:
        $s1 = "DB_HOST" nocase
        $s2 = "DB_USER" nocase
        $s3 = "DB_PASSWORD" nocase
        $s4 = "api_key" nocase
        $s5 = "rehub_get_config" nocase
    condition:
        any of ($s*) and filesize < 100KB
}

Sigma Rule

title: CVE-2025-67565 - Rehub Theme Sensitive Information Disclosure
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects HTTP requests to Rehub theme endpoints that may expose sensitive data
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'GET'
        cs-uri-stem:
            - '/wp-json/rehub/v1/config'
            - '/wp-content/themes/rehub/debug.php'
    condition: selection
falsepositives:
    - Legitimate admin access (rare)
level: high

Suricata Rule

alert http any any -> $HOME_NET any (
    msg:"CVE-2025-67565 - Rehub Theme Sensitive Information Disclosure Attempt";
    flow:to_server,established;
    content:"GET"; http_method;
    content:"/wp-json/rehub/v1/config"; http_uri;
    classtype:attempted-recon;
    sid:1000001;
    rev:1;
    reference:cve,2025-67565;
)

Remediation & Mitigation

Immediate Actions:

1. Disable the vulnerable endpoint by adding the following to your .htaccess file:

   <IfModule mod_rewrite.c>
   RewriteEngine On
   RewriteRule ^wp-json/rehub/v1/config - [F,L]
   RewriteRule ^wp-content/themes/rehub/debug\.php - [F,L]
   </IfModule>
   

2. Remove or rename any suspicious files in the theme directory (e.g., debug.php, config.php).
3. Change all database credentials and API keys that may have been exposed.

Long-Term Fix:

• Monitor the vendor’s website for a patched version (>= 19.9.9.2).
• Implement a Web Application Firewall (WAF) rule to block requests to the vulnerable endpoints.
• Conduct a security audit of the theme to identify other potential information disclosure issues.

Valters IT
Securing WordPress ecosystems one CVE at a time.