CVE-2025-30915

Executive Summary

CVE-2025-30915 is a Missing Authorization vulnerability in the WordPress plugin Small Package Quotes – Worldwide Express Edition by enituretechnology. This flaw allows unauthenticated attackers 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 5.2.19. As a WordPress plugin issue, the attack surface is limited to sites running this specific plugin, and the root cause lies in the plugin’s failure to properly enforce authorization checks on certain AJAX actions or REST endpoints.

Supply Chain & Package Security

This vulnerability is specific to the WordPress plugin ecosystem. The plugin is distributed via the official WordPress plugin repository and third-party marketplaces. Users should verify the integrity of their plugin files and ensure they are sourced from trusted channels. No known supply chain compromise has been reported, but the lack of a patch increases the risk of malicious actors distributing modified versions.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
• Base Score: 6.5 (Medium)
• Attack Vector: Network
• Attack Complexity: Low
• Privileges Required: None
• 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 no required privileges, but the impact is limited to low confidentiality and integrity loss. Exploitation could lead to unauthorized viewing or modification of shipping quotes and related data.

Deep Dive & Mechanics

The vulnerability stems from missing authorization checks in the plugin’s AJAX handlers or REST API endpoints. The plugin likely registers several WordPress AJAX actions (both wp_ajax_ and wp_ajax_nopriv_) to handle quote requests, configuration updates, or data retrieval. Without proper capability checks (e.g., current_user_can('manage_options')), unauthenticated users can trigger these actions.

Root Cause: The plugin fails to validate user permissions before executing sensitive operations. For example, an endpoint intended for admin-only configuration changes might be accessible to anyone.

Attack Vector: An attacker sends crafted HTTP requests to the vulnerable endpoints, bypassing authentication and authorization checks.

Impact: Unauthorized access to shipping quote data, modification of plugin settings, or exposure of internal configuration details.

Vulnerable vs. Patched Code

Since no patch is available, we can only hypothesize the fix. The vulnerable code likely resembles:

// Vulnerable: No capability check
add_action('wp_ajax_nopriv_wwe_update_settings', 'wwe_update_settings');
function wwe_update_settings() {
    // Process settings update
    update_option('wwe_settings', $_POST);
}

A patched version would include:

// Patched: Capability check added
add_action('wp_ajax_wwe_update_settings', 'wwe_update_settings');
function wwe_update_settings() {
    if (!current_user_can('manage_options')) {
        wp_die('Unauthorized');
    }
    // Process settings update
    update_option('wwe_settings', $_POST);
}

The key difference is the addition of current_user_can() checks and restricting actions to authenticated users only (removing nopriv_ prefix where appropriate).

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• Target WordPress site with plugin version <= 5.2.19
• Network access to the site

Exploitation Steps:

1. Identify Vulnerable Endpoints: Use a tool like Burp Suite or curl to enumerate AJAX actions. Look for actions like wwe_get_quotes, wwe_update_settings, or wwe_export_data.

2. Craft Exploit Request: Send a POST request to the vulnerable endpoint without authentication.

curl -X POST https://target.com/wp-admin/admin-ajax.php \
  -d "action=wwe_get_quotes&origin=NYC&destination=LAX"

3. Verify Unauthorized Access: If the response contains sensitive data (e.g., shipping rates, API keys), the vulnerability is confirmed.

Proof-of-Concept (No public exploit available):

import requests

target = "https://target.com/wp-admin/admin-ajax.php"
payload = {
    "action": "wwe_get_quotes",
    "origin": "NYC",
    "destination": "LAX"
}
response = requests.post(target, data=payload)
if response.status_code == 200 and "quotes" in response.text:
    print("Vulnerable!")

Blue Team (Detection & Hardening)

Detection:

• Monitor for unusual AJAX requests to admin-ajax.php with nopriv_ actions related to the plugin.
• Look for spikes in requests to endpoints like wwe_get_quotes or wwe_update_settings from unauthenticated IPs.

Hardening:

• Disable the plugin until a patch is available.
• Implement a Web Application Firewall (WAF) rule to block requests to known vulnerable endpoints.
• Use a security plugin like Wordfence to add virtual patching.

Indicators of Compromise (IOCs)

• URL Patterns: /wp-admin/admin-ajax.php?action=wwe_*
• Log Entries: Repeated 200 responses to admin-ajax.php with action parameters containing wwe_ from unauthenticated sources.
• File Changes: Unexpected modifications to wp-content/plugins/small-package-quotes-wwe-edition/ files.
• Network Traffic: POST requests to admin-ajax.php with JSON or form data containing wwe_ actions.

Detection Engineering

YARA Rule

rule CVE_2025_30915_WordPress_Plugin {
    meta:
        description = "Detects exploitation attempts for CVE-2025-30915 in WordPress plugin Small Package Quotes"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2025-30915"
    strings:
        $action1 = "action=wwe_get_quotes" ascii wide nocase
        $action2 = "action=wwe_update_settings" ascii wide nocase
        $action3 = "action=wwe_export_data" ascii wide nocase
        $plugin_path = "small-package-quotes-wwe-edition" ascii wide nocase
    condition:
        any of ($action*) and $plugin_path
}

Sigma Rule

title: CVE-2025-30915 Exploitation Attempt
id: 8a4b3c2d-1e5f-6a7b-8c9d-0e1f2a3b4c5d
status: experimental
description: Detects unauthenticated AJAX requests to vulnerable WordPress plugin endpoints
author: Valters IT
date: 2025/04/10
logsource:
    category: webserver
    product: apache
    service: access
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: 'admin-ajax.php'
        cs-uri-query|contains|all:
            - 'action=wwe_'
    condition: selection
falsepositives:
    - Legitimate admin actions (rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-30915 WordPress Plugin Exploitation Attempt"; flow:to_server,established; content:"POST"; http_method; content:"admin-ajax.php"; http_uri; content:"action=wwe_"; http_client_body; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin until an official patch is released.
2. Apply virtual patching via WAF rules to block requests to admin-ajax.php with action parameters starting with wwe_.
3. Review server logs for signs of exploitation.

Long-term Fix:

• Monitor the plugin vendor’s website for updates.
• Once patched, update to the latest version immediately.
• Implement a security plugin that provides real-time monitoring and virtual patching for known vulnerabilities.

Workaround:

• If the plugin is critical, restrict access to admin-ajax.php via .htaccess or server configuration to only allow authenticated requests.

Valters IT
Securing Digital Frontiers