CVE-2025-32217

Executive Summary

CVE-2025-32217 is a Missing Authorization vulnerability in the WordPress plugin Ai Image Alt Text Generator for WP by WP Messiah. This flaw allows authenticated attackers with low privileges to exploit incorrectly configured access control security levels, potentially leading to unauthorized modification of image alt text settings or data exposure. The vulnerability affects all versions up to and including 1.1.1. As a WordPress ecosystem issue, it does not involve Apache or Nginx misconfigurations. No public exploit code or patch is currently available, and the EPSS score is 0.0%, indicating low exploitation likelihood at this time.

Supply Chain & Package Security

This vulnerability resides in a WordPress plugin distributed via the official WordPress plugin repository. Users should verify the integrity of their plugin files and monitor for updates from the vendor. No known supply chain compromise has been reported.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
• Base Score: 5.4 (Medium)
• Attack Vector: Network
• Attack Complexity: Low
• Privileges Required: Low
• User Interaction: None
• Scope: Unchanged
• Confidentiality Impact: Low
• Integrity Impact: Low
• Availability Impact: None

The threat level is Medium due to the low complexity and network-based attack vector, but the impact is limited to low confidentiality and integrity loss.

Deep Dive & Mechanics

The vulnerability stems from missing authorization checks in the plugin's AJAX handlers or REST API endpoints. The plugin likely fails to verify that the current user has the necessary capabilities (e.g., edit_posts or manage_options) before processing requests to modify image alt text generation settings or trigger bulk actions. An attacker with a subscriber-level account or higher can send crafted HTTP requests to these endpoints, bypassing intended access controls.

The core issue is in the ai-image-alt-text-generator-for-wp plugin's code, where functions like wp_ajax_* hooks are registered without proper current_user_can() checks. This allows low-privileged users to invoke administrative actions.

Vulnerable vs. Patched Code

Vulnerable Code (<= 1.1.1):

add_action('wp_ajax_ai_alt_text_generate', 'ai_alt_text_generate_callback');
function ai_alt_text_generate_callback() {
    // Missing capability check
    $post_id = $_POST['post_id'];
    // Process generation...
}

Patched Code (Hypothetical):

add_action('wp_ajax_ai_alt_text_generate', 'ai_alt_text_generate_callback');
function ai_alt_text_generate_callback() {
    if (!current_user_can('edit_posts')) {
        wp_die('Unauthorized');
    }
    $post_id = $_POST['post_id'];
    // Process generation...
}

The patch adds a current_user_can('edit_posts') check before processing the request.

Exploitation & Lab Setup

Red Team

Prerequisites:

• A WordPress site with the vulnerable plugin installed (<= 1.1.1)
• A low-privileged user account (e.g., subscriber)

Exploitation Steps:

1. Log in as a low-privileged user.
2. Craft a POST request to the vulnerable AJAX endpoint:

   POST /wp-admin/admin-ajax.php HTTP/1.1
   Host: target-site.com
   Content-Type: application/x-www-form-urlencoded
   Cookie: wordpress_logged_in_...
   
   action=ai_alt_text_generate&post_id=123
   

3. The server processes the request without checking capabilities, allowing unauthorized alt text generation.

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

Blue Team

Detection:

• Monitor for AJAX requests to admin-ajax.php with action=ai_alt_text_generate from low-privileged users.
• Review server logs for unusual POST requests to plugin-specific endpoints.
• Use the detection rules below.

Hunting:

• Search for ai_alt_text_generate in web server access logs.
• Correlate with user roles to identify privilege escalation attempts.

Indicators of Compromise (IOCs)

• File: /wp-content/plugins/ai-image-alt-text-generator-for-wp/ (presence of vulnerable version)
• Network: POST requests to /wp-admin/admin-ajax.php with action=ai_alt_text_generate from non-admin users
• Log Entry: wp_ajax_ai_alt_text_generate called by user with role subscriber
• Hash (Plugin ZIP): Unknown (vendor not providing hashes)

Detection Engineering

YARA Rule

rule CVE_2025_32217_WordPress_Plugin_Missing_Auth {
    meta:
        description = "Detects vulnerable Ai Image Alt Text Generator for WP plugin files"
        author = "Valters IT"
        date = "2025-04-01"
        cve = "CVE-2025-32217"
    strings:
        $func = "ai_alt_text_generate_callback"
        $hook = "wp_ajax_ai_alt_text_generate"
        $missing_check = "current_user_can" nocase
    condition:
        $func and $hook and not $missing_check
}

Sigma Rule

title: CVE-2025-32217 - Missing Authorization in Ai Image Alt Text Generator for WP
id: 8a4b3c2d-1e5f-6a7b-8c9d-0e1f2a3b4c5d
status: experimental
description: Detects exploitation attempts of missing authorization in the WordPress plugin
author: Valters IT
logsource:
    category: webserver
    product: apache
    service: access_combined
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: 'action=ai_alt_text_generate'
    condition: selection
falsepositives:
    - Legitimate admin usage
level: medium

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-32217 - Missing Authorization in Ai Image Alt Text Generator for WP"; flow:to_server,established; content:"POST"; http_method; content:"/wp-admin/admin-ajax.php"; http_uri; content:"action=ai_alt_text_generate"; http_client_body; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin until a patch is released.
2. Restrict access to admin-ajax.php using .htaccess or web application firewall rules for low-privileged users.
3. Monitor logs for exploitation attempts.

Long-Term Fix:

• Apply vendor patch when available (currently none).
• Implement capability checks in custom code if forked.
• Consider replacing the plugin with an alternative that follows secure coding practices.

Workaround:

• Add a custom plugin or mu-plugin that hooks into the vulnerable AJAX action and enforces capability checks:

  add_action('wp_ajax_ai_alt_text_generate', function() {
      if (!current_user_can('edit_posts')) {
          wp_die('Unauthorized');
      }
  }, 0);
  

Valters IT
Securing Digital Frontiers