CVE-2025-32220

Executive Summary

CVE-2025-32220 is a Missing Authorization vulnerability in the Salon Booking System WordPress plugin by Dimitri Grassi. 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 10.30.26. As of this report, no official patch has been released, and no public proof-of-concept (PoC) code is available. The CVSS score is 5.4 (Medium), indicating a moderate risk primarily due to the lack of required privileges and the potential for exploitation over the network.

Supply Chain & Package Security

This vulnerability resides in a WordPress plugin ecosystem. The plugin is distributed via the official WordPress plugin repository and third-party marketplaces. Users are advised to monitor the plugin’s update channel and apply any security patches immediately upon release. Since no patch is currently available, consider disabling the plugin or implementing strict access controls as a temporary measure.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Network (N) – Exploitable remotely.
• Attack Complexity (AC): Low (L) – No special conditions required.
• Privileges Required (PR): None (N) – No authentication needed.
• User Interaction (UI): None (N) – No user action required.
• Scope (S): Unchanged (U) – Impact confined to the vulnerable component.
• Confidentiality Impact (C): Low (L) – Limited data exposure.
• Integrity Impact (I): Low (L) – Limited data modification.
• Availability Impact (A): None (N) – No denial of service.

Threat Level: Medium. The vulnerability is easy to exploit but has limited impact on confidentiality and integrity.

Deep Dive & Mechanics

The vulnerability stems from missing authorization checks in the salon-booking-system plugin. Specifically, certain REST API endpoints or AJAX actions do not verify whether the requesting user has the necessary permissions (e.g., manage_options or edit_posts). This allows an unauthenticated attacker to:

• Access sensitive booking data (customer names, appointments, contact details).
• Modify or delete existing bookings.
• Potentially escalate privileges if combined with other flaws.

The plugin likely uses WordPress’s wp_ajax_ and wp_ajax_nopriv_ hooks incorrectly, exposing administrative functions to unauthenticated users.

Vulnerable vs. Patched Code

Since no patch is available, the vulnerable code pattern is described below. A patched version would include proper capability checks.

Vulnerable Code (Example):

add_action('wp_ajax_nopriv_salon_get_bookings', 'salon_get_bookings');
function salon_get_bookings() {
    // No capability check
    $bookings = $wpdb->get_results("SELECT * FROM {$wpdb->prefix}salon_bookings");
    wp_send_json($bookings);
}

Patched Code (Expected):

add_action('wp_ajax_salon_get_bookings', 'salon_get_bookings');
add_action('wp_ajax_nopriv_salon_get_bookings', 'salon_get_bookings');
function salon_get_bookings() {
    if (!current_user_can('manage_options')) {
        wp_die('Unauthorized', 403);
    }
    $bookings = $wpdb->get_results("SELECT * FROM {$wpdb->prefix}salon_bookings");
    wp_send_json($bookings);
}

Exploitation & Lab Setup

Red Team (Attack Simulation)

1. Setup: Deploy a WordPress instance with the vulnerable plugin (version <= 10.30.26).
2. Reconnaissance: Identify exposed endpoints using:

   curl -s http://target/wp-json/salon-booking-system/v1/ | jq .
   

3. Exploit: Send an unauthenticated request to a vulnerable endpoint:

   curl -X GET http://target/wp-admin/admin-ajax.php?action=salon_get_bookings
   

4. Verify: Check the response for sensitive data.

Blue Team (Defense & Detection)

• Monitor: Log all requests to admin-ajax.php and REST API endpoints.
• Harden: Disable the plugin if not essential. Implement a Web Application Firewall (WAF) rule to block unauthenticated access to plugin-specific endpoints.
• Audit: Review plugin code for missing current_user_can() checks.

Indicators of Compromise (IOCs)

• Network: HTTP requests to /wp-admin/admin-ajax.php with action=salon_* parameters from unauthenticated sources.
• Logs: WordPress debug logs showing wp_ajax_nopriv_ calls to plugin functions.
• File: Presence of unexpected entries in the wp_options table related to the plugin.

Detection Engineering

YARA Rule

rule CVE_2025_32220_Salon_Booking_System {
    meta:
        description = "Detects vulnerable Salon Booking System plugin files"
        author = "Valters IT"
        date = "2025-04-01"
        cve = "CVE-2025-32220"
    strings:
        $vuln_func = "wp_ajax_nopriv_salon" nocase
        $cap_check = "current_user_can" nocase
    condition:
        $vuln_func and not $cap_check
}

Sigma Rule

title: CVE-2025-32220 - Unauthenticated Access to Salon Booking System
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects unauthenticated requests to Salon Booking System AJAX endpoints
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: GET
        cs-uri-query|contains: 'action=salon_'
        sc-status: 200
    condition: selection
falsepositives:
    - Legitimate authenticated users (rare)
level: medium

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-32220 - Unauthenticated Salon Booking System Access"; flow:to_server; http.uri; content:"/wp-admin/admin-ajax.php"; http.client_body; content:"action=salon_"; nocase; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate: Disable the plugin if not critical. Use a WAF to block unauthenticated requests to plugin endpoints.
2. Short-term: Monitor the plugin’s update channel for a patched version. Apply as soon as available.
3. Long-term: Implement a security plugin (e.g., Wordfence) to enforce capability checks. Regularly audit third-party plugins for missing authorization.

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