CVE-2024-48045

Executive Summary

CVE-2024-48045 is a Missing Authorization vulnerability in the Happy Addons for Elementor WordPress plugin, developed by Leevio (HappyMonster). This flaw allows an unauthenticated attacker to exploit incorrectly configured access control security levels, potentially leading to unauthorized data access or modification. The vulnerability affects all versions up to and including 3.12.3. As of this report, no official patch has been released, and no public proof-of-concept (PoC) or exploit code is available. The CVSS score is 4.3 (Medium), and the EPSS probability is 0.0%, indicating low exploitation likelihood in the wild.

Supply Chain & Package Security

This vulnerability resides in a WordPress plugin ecosystem. The plugin is distributed via the official WordPress plugin repository and can be installed directly from the WordPress admin dashboard. Since no patch is available, users are advised to disable the plugin or implement strict access controls via a Web Application Firewall (WAF) until a fix is released.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
• Base Score: 4.3 (Medium)
• Attack Vector: Network (AV:N)
• Attack Complexity: Low (AC:L)
• Privileges Required: None (PR:N)
• User Interaction: None (UI:N)
• Scope: Unchanged (S:U)
• Confidentiality Impact: None (C:N)
• Integrity Impact: Low (I:L)
• Availability Impact: None (A:N)

Threat Level: Medium. The vulnerability is easy to exploit remotely without authentication, but the impact is limited to low integrity compromise (e.g., modifying non-critical settings or content). No public exploit exists, reducing immediate risk.

Deep Dive & Mechanics

The vulnerability stems from a Missing Authorization check (CWE-862) in the happy-elementor-addons plugin. Specifically, certain AJAX actions or REST endpoints within the plugin fail to verify user capabilities before processing requests. This allows an unauthenticated attacker to trigger actions that should require at least contributor-level privileges.

Root Cause: The plugin uses wp_ajax_* hooks without proper current_user_can() checks, or implements nonce verification incorrectly. The affected functionality likely involves settings updates, content manipulation, or data export/import operations.

Attack Vector: An attacker sends a crafted HTTP request to the WordPress site, targeting the vulnerable endpoint. Since no authentication is required, the request can be made from any network-accessible location.

Impact: Successful exploitation could allow an attacker to modify plugin settings, inject malicious content, or access sensitive configuration data. However, the exact impact depends on the specific unprotected function.

Vulnerable vs. Patched Code

Since no patch is available, a hypothetical fix would involve adding capability checks to all AJAX handlers. Below is an example of vulnerable vs. patched code.

Vulnerable Code (hypothetical):

add_action('wp_ajax_happy_addons_update_setting', 'happy_addons_update_setting');
function happy_addons_update_setting() {
    // Missing capability check
    update_option('happy_addons_setting', $_POST['setting']);
    wp_die();
}

Patched Code (hypothetical):

add_action('wp_ajax_happy_addons_update_setting', 'happy_addons_update_setting');
function happy_addons_update_setting() {
    if (!current_user_can('manage_options')) {
        wp_die('Unauthorized', 403);
    }
    check_ajax_referer('happy_addons_nonce', 'nonce');
    update_option('happy_addons_setting', sanitize_text_field($_POST['setting']));
    wp_die();
}

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• Target WordPress site with Happy Addons for Elementor <= 3.12.3 installed and activated.
• Network access to the site.

Exploitation Steps:

1. Identify the vulnerable endpoint. Common patterns include /wp-admin/admin-ajax.php?action=happy_addons_*.
2. Craft a POST request with the required parameters. Example using curl:

   curl -X POST http://target.com/wp-admin/admin-ajax.php \
        -d "action=happy_addons_update_setting&setting=malicious_value"
   

3. If successful, the setting is updated without authentication.

Note: No public exploit code is available. The above is a generic example based on the vulnerability type.

Blue Team (Detection & Defense)

Detection:

• Monitor for unusual AJAX requests to /wp-admin/admin-ajax.php with action parameters containing happy_addons_* from unauthenticated sources.
• Look for HTTP 200 responses to such requests without prior login.

Defense:

• Disable the plugin until a patch is released.
• Implement a Web Application Firewall (WAF) rule to block unauthenticated requests to admin-ajax.php with happy_addons_* actions.
• Use a security plugin (e.g., Wordfence) to enforce capability checks.

Indicators of Compromise (IOCs)

• Network IOCs:

  • HTTP POST requests to /wp-admin/admin-ajax.php with action=happy_addons_* parameters from IPs not associated with authenticated users.
  • Repeated 200 responses to such requests without prior login.

• File IOCs:

  • Modified plugin files in /wp-content/plugins/happy-elementor-addons/ (check file integrity via checksums).

• Log IOCs:

  • WordPress debug log entries showing unexpected AJAX calls to happy_addons_* actions.

Detection Engineering

YARA Rule

rule Detect_CVE_2024_48045_Exploit {
    meta:
        description = "Detects exploitation attempts for CVE-2024-48045 in Happy Addons for Elementor"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2024-48045"
    strings:
        $ajax_action = "action=happy_addons_" nocase
        $admin_ajax = "admin-ajax.php" nocase
    condition:
        $ajax_action and $admin_ajax
}

Sigma Rule

title: CVE-2024-48045 Exploitation Attempt
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects unauthenticated AJAX requests to Happy Addons for Elementor endpoints
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        c-uri|contains: '/wp-admin/admin-ajax.php'
        cs-uri-query|contains: 'action=happy_addons_'
    condition: selection
falsepositives:
    - Legitimate authenticated admin actions (rare)
level: medium

Suricata Rule

alert http any any -> any any (msg:"CVE-2024-48045 - Happy Addons for Elementor Missing Authorization Exploit"; flow:to_server,established; http.method; content:"POST"; http.uri; content:"/wp-admin/admin-ajax.php"; http.client_body; content:"action=happy_addons_"; nocase; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin if not critical to operations.
2. Apply a virtual patch via WAF to block unauthenticated requests to admin-ajax.php with happy_addons_* actions.
3. Monitor logs for exploitation attempts.

Long-term Fix:

• Wait for the vendor (Leevio) to release a patched version (>= 3.12.4). Once available, update immediately.
• If the plugin is abandoned, consider replacing it with an alternative.

Workaround:

• Add the following code to the theme's functions.php to enforce capability checks (use with caution):

  add_action('init', function() {
      if (defined('DOING_AJAX') && DOING_AJAX) {
          $action = $_REQUEST['action'] ?? '';
          if (strpos($action, 'happy_addons_') === 0 && !current_user_can('edit_posts')) {
              wp_die('Unauthorized', 403);
          }
      }
  });
  

Valters IT
Senior DevSecOps & Cyber Threat Intelligence Analyst