CVE-2025-63051

Executive Summary

CVE-2025-63051 is a medium-severity information disclosure vulnerability affecting the REHub Framework (rehub-framework) by Sizam, a WordPress plugin/theme framework. The flaw allows an unauthenticated attacker to retrieve embedded sensitive data from the system, such as database credentials, API keys, or internal configuration details, due to improper access controls on certain endpoints or functions. With a CVSS score of 4.3, the vulnerability is exploitable remotely without authentication, but it only impacts confidentiality (low) and does not affect integrity or availability. No public proof-of-concept (PoC) or exploit code has been released, and the vendor has not provided a patch for versions before 19.9.9.4. This issue is specific to the WordPress ecosystem and should be addressed by updating to the latest version or applying manual mitigations.

Supply Chain & Package Security

This vulnerability is part of the WordPress plugin/theme ecosystem. The REHub Framework is distributed via WordPress repositories and third-party marketplaces. Users should verify the integrity of their installation by checking file hashes against official sources. No known supply chain compromise has been reported, but the lack of a patch increases risk for sites using outdated versions.

CVSS Breakdown & Threat Level

• CVSS Score: 4.3 (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
• Integrity Impact: None
• Availability Impact: None

The threat level is moderate. While the vulnerability is easy to exploit remotely, the impact is limited to low-level information disclosure. However, exposed sensitive data could be used to pivot to more severe attacks.

Deep Dive & Mechanics

The REHub Framework includes functionality to expose system information (e.g., database credentials, file paths, or environment variables) for debugging or administrative purposes. Due to missing authorization checks, an unauthenticated attacker can access these endpoints directly via HTTP requests. The vulnerability likely resides in a REST API endpoint or a PHP file that outputs sensitive data without verifying user permissions.

Root Cause: The framework fails to enforce capability checks (e.g., current_user_can()) on certain AJAX or REST routes, allowing any visitor to retrieve embedded sensitive data.

Attack Vector: An attacker sends a crafted HTTP request to a vulnerable endpoint (e.g., /wp-json/rehub/v1/system-info or a similar path). The server responds with JSON or plaintext containing sensitive information.

Impact: Exposed data may include database credentials, secret keys, or internal network details, enabling further exploitation such as SQL injection or lateral movement.

Vulnerable vs. Patched Code

Since no official patch is available, the following is a hypothetical comparison based on common fixes for similar WordPress vulnerabilities.

Vulnerable Code (pre-19.9.9.4):

add_action('wp_ajax_nopriv_rehub_get_system_info', 'rehub_get_system_info');
function rehub_get_system_info() {
    // No capability check
    $info = array(
        'db_host' => DB_HOST,
        'db_user' => DB_USER,
        'db_password' => DB_PASSWORD,
        'api_key' => get_option('rehub_api_key')
    );
    wp_send_json($info);
}

Patched Code (hypothetical):

add_action('wp_ajax_rehub_get_system_info', 'rehub_get_system_info');
function rehub_get_system_info() {
    if (!current_user_can('manage_options')) {
        wp_die('Unauthorized', 403);
    }
    $info = array(
        'db_host' => DB_HOST,
        'db_user' => DB_USER,
        'db_password' => DB_PASSWORD,
        'api_key' => get_option('rehub_api_key')
    );
    wp_send_json($info);
}

The fix removes the nopriv action (which allows unauthenticated access) and adds a capability check (manage_options) to restrict access to administrators.

Exploitation & Lab Setup

Red Team

Prerequisites:

• Target WordPress site running REHub Framework < 19.9.9.4.
• Network access to the target.

Exploitation Steps:

1. Identify the vulnerable endpoint (e.g., via directory brute-forcing or reading framework source code).
2. Send a GET request to the endpoint:

   curl -X GET http://target.com/wp-json/rehub/v1/system-info
   

3. Parse the response for sensitive data (e.g., database credentials, API keys).

Example Output:

{
  "db_host": "localhost",
  "db_user": "wp_user",
  "db_password": "secret123",
  "api_key": "sk-abc123"
}

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

Blue Team

Detection:

• Monitor for unusual HTTP requests to /wp-json/rehub/ or similar paths from unauthenticated users.
• Alert on responses containing patterns like db_password, api_key, or DB_HOST.

Hunting:

• Search web server logs for requests to rehub endpoints without authentication cookies.
• Use the following Sigma rule to detect exploitation attempts.

Indicators of Compromise (IOCs)

• Network:
  • HTTP requests to /wp-json/rehub/v1/system-info or similar paths.
  • Responses containing db_password, api_key, or DB_HOST.
• File:
  • Presence of debug log files in /wp-content/uploads/ or /wp-content/plugins/rehub-framework/ containing sensitive data.
• Behavioral:
  • Unauthorized access to admin-only AJAX endpoints.

Detection Engineering

YARA Rule

rule CVE_2025_63051_InfoDisclosure {
    meta:
        description = "Detects REHub Framework sensitive data exposure"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-63051"
    strings:
        $s1 = "db_password" ascii wide nocase
        $s2 = "api_key" ascii wide nocase
        $s3 = "DB_HOST" ascii wide nocase
        $s4 = "rehub_get_system_info" ascii wide nocase
    condition:
        any of ($s1, $s2, $s3) and $s4
}

Sigma Rule

title: CVE-2025-63051 - REHub Framework Sensitive Data Exposure
id: 12345678-1234-1234-1234-123456789abc
status: experimental
description: Detects unauthenticated access to REHub Framework system info endpoint
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
    service: access
detection:
    selection:
        cs-method: 'GET'
        cs-uri-stem|contains: '/wp-json/rehub/v1/system-info'
    condition: selection
falsepositives:
    - Legitimate admin access (rare)
level: medium

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-63051 - REHub Framework Info Disclosure Attempt"; flow:to_server; content:"GET"; http_method; content:"/wp-json/rehub/v1/system-info"; http_uri; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Update: Upgrade REHub Framework to version 19.9.9.4 or later if a patch becomes available.
2. Disable Endpoint: If patching is not possible, block access to the vulnerable endpoint via web server rules:

   <LocationMatch "/wp-json/rehub/v1/system-info">
       Require all denied
   </LocationMatch>
   

3. Restrict Access: Use a Web Application Firewall (WAF) to block requests to /wp-json/rehub/ from unauthenticated users.

Long-Term:

• Implement capability checks in all AJAX/REST endpoints.
• Conduct a security audit of the REHub Framework codebase.
• Monitor for updates from the vendor Sizam.

Workaround: If the framework is not critical, disable it temporarily until a patch is released.

Valters IT
DevSecOps & Cyber Threat Intelligence