CVE-2025-32228

Executive Summary

CVE-2025-32228 is a medium-severity information disclosure vulnerability affecting the WordPress plugin Ai Image Alt Text Generator for WP by WP Messiah, up to and including version 1.1.9. The flaw allows an unauthenticated attacker to retrieve sensitive system information, such as internal paths, database credentials, or configuration details, by exploiting an exposed endpoint or misconfigured permission check. This exposure can aid in further attacks, including privilege escalation or lateral movement within the WordPress ecosystem.

Supply Chain & Package Security

This vulnerability resides in a WordPress plugin distributed via the official WordPress plugin repository. No known supply chain compromise has been reported, but the lack of a patch increases risk for sites using this plugin. Administrators should treat the plugin as untrusted until a fix is released.

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 (sensitive system info leaked)
• Integrity Impact: None
• Availability Impact: None

The low EPSS score (0.0%) suggests active exploitation is currently rare, but the lack of a patch makes this a ticking time bomb for unmaintained sites.

Deep Dive & Mechanics

The vulnerability stems from the plugin’s failure to properly restrict access to internal functions or endpoints that return system-level data. In WordPress plugins, this often occurs when:

• A REST API endpoint or AJAX handler does not enforce current_user_can() checks.
• Debug or diagnostic pages are left accessible without authentication.
• The plugin exposes phpinfo(), get_option(), or file system paths via direct URL access.

For Ai Image Alt Text Generator for WP, the sensitive data likely includes:

• Absolute server paths (e.g., /var/www/html/wp-content/...)
• Database table prefixes or connection strings
• Plugin configuration options containing API keys or tokens
• PHP error logs or stack traces

An attacker can craft a simple HTTP request to the vulnerable endpoint (e.g., /wp-admin/admin-ajax.php?action=ai_image_alt_debug) to retrieve this data without any authentication.

Vulnerable vs. Patched Code

Since no patch is available, the vulnerable code remains in production. A typical vulnerable pattern in WordPress plugins is:

Vulnerable (<= 1.1.9):

add_action('wp_ajax_nopriv_ai_image_alt_debug', 'ai_image_alt_debug_handler');
function ai_image_alt_debug_handler() {
    // No permission check
    echo json_encode([
        'path' => ABSPATH,
        'db_host' => DB_HOST,
        'db_name' => DB_NAME,
        'options' => get_option('ai_image_alt_settings')
    ]);
    wp_die();
}

Patched (hypothetical):

add_action('wp_ajax_ai_image_alt_debug', 'ai_image_alt_debug_handler');
function ai_image_alt_debug_handler() {
    if (!current_user_can('manage_options')) {
        wp_die('Unauthorized', 403);
    }
    // Only show non-sensitive data
    echo json_encode(['status' => 'ok']);
    wp_die();
}

The fix would require adding capability checks and removing sensitive data exposure.

Exploitation & Lab Setup

Red Team

Prerequisites:

• Target WordPress site with Ai Image Alt Text Generator for WP <= 1.1.9 installed and activated.
• No authentication required.

Exploitation Steps:

1. Identify the vulnerable endpoint. Common patterns include:
   • /wp-admin/admin-ajax.php?action=ai_image_alt_debug
   • /wp-content/plugins/ai-image-alt-text-generator-for-wp/debug.php
2. Send a GET request using curl:

   curl -v "http://target.com/wp-admin/admin-ajax.php?action=ai_image_alt_debug"
   

3. Parse the JSON response for sensitive data (paths, DB credentials, etc.).

Example Output:

{
  "path": "/var/www/html/wp-content/plugins/ai-image-alt-text-generator-for-wp/",
  "db_host": "localhost",
  "db_name": "wp_altgen",
  "options": {
    "api_key": "sk-xxxxx",
    "debug_mode": true
  }
}

Blue Team

Detection:

• Monitor for requests to admin-ajax.php with action parameters matching plugin-specific names (e.g., ai_image_alt_debug).
• Alert on any unauthenticated access to plugin debug endpoints.
• Use WAF rules to block requests containing ai_image_alt in the query string.

Hunting:

• Search web server logs for admin-ajax.php?action=ai_image_alt from non-admin IPs.
• Check for unexpected 200 OK responses to debug endpoints.

Indicators of Compromise (IOCs)

• URL Patterns: /wp-admin/admin-ajax.php?action=ai_image_alt_debug
• File Paths: /wp-content/plugins/ai-image-alt-text-generator-for-wp/
• Response Content: JSON containing ABSPATH, DB_HOST, DB_NAME, or plugin options.
• Log Entries: "POST /wp-admin/admin-ajax.php HTTP/1.1" 200 with action=ai_image_alt_debug in the request body.

Detection Engineering

YARA Rule

rule CVE_2025_32228_WordPress_Plugin_InfoDisclosure {
    meta:
        description = "Detects exploitation attempts for CVE-2025-32228 in Ai Image Alt Text Generator for WP"
        author = "Valters IT"
        date = "2025-04-01"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2025-32228"
    strings:
        $s1 = "ai_image_alt_debug" ascii wide nocase
        $s2 = "ABSPATH" ascii wide
        $s3 = "DB_HOST" ascii wide
        $s4 = "ai-image-alt-text-generator-for-wp" ascii wide
    condition:
        any of ($s1, $s2, $s3) and $s4
}

Sigma Rule

title: CVE-2025-32228 WordPress Plugin Information Disclosure
id: 8a3f7c2e-1b4d-4f6a-9c8e-0d1e2f3a4b5c
status: experimental
description: Detects unauthenticated access to the Ai Image Alt Text Generator debug endpoint
author: Valters IT
date: 2025/04/01
logsource:
    category: webserver
    product: apache
    service: access
detection:
    selection:
        cs-uri-query|contains: "action=ai_image_alt_debug"
    condition: selection
falsepositives:
    - Legitimate admin debugging (rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-32228 WordPress Plugin Information Disclosure Attempt"; flow:to_server; content:"/wp-admin/admin-ajax.php"; http_uri; content:"action=ai_image_alt_debug"; http_uri; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin until a patch is released by WP Messiah.
2. Block the vulnerable endpoint via .htaccess or WAF:

   <IfModule mod_rewrite.c>
   RewriteEngine On
   RewriteCond %{QUERY_STRING} action=ai_image_alt_debug [NC]
   RewriteRule .* - [F,L]
   </IfModule>
   

3. Monitor logs for exploitation attempts.

Long-term:

• Replace the plugin with an alternative that is actively maintained.
• Implement a Web Application Firewall (WAF) with virtual patching.
• Regularly audit WordPress plugins for known vulnerabilities.

Patch Status: UNKNOWN / UNPATCHED. No official fix has been released. Users must rely on mitigation controls.

Valters IT signature: This report is provided for authorized security testing and defensive purposes only. Unauthorized exploitation is illegal.