CVE-2024-54333

Executive Summary

CVE-2024-54333 is a reflected Cross-Site Scripting (XSS) vulnerability in the WordPress plugin Check Pincode For Woocommerce, developed by Silverplugins217. The vulnerability exists in versions up to and including 1.1. It allows an unauthenticated attacker to inject arbitrary web scripts or HTML via a crafted URL, which will be reflected back to the victim's browser. This can lead to session hijacking, credential theft, or defacement. The plugin is part of the WordPress ecosystem, and the vulnerability is not related to Apache or Nginx.

Supply Chain & Package Security

This vulnerability affects a WordPress plugin distributed through the official WordPress plugin repository. Users who have installed the plugin from the WordPress dashboard or via direct download are at risk. The plugin is not available on NPM, PyPI, Go, or Ruby registries. The patch status is unknown, and no official update has been released by the vendor.

CVSS Breakdown & Threat Level

• CVSS Score: 7.1 (High)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
• Attack Vector: Network (AV:N)
• Attack Complexity: Low (AC:L)
• Privileges Required: None (PR:N)
• User Interaction: Required (UI:R) - victim must click a crafted link
• Scope: Changed (S:C) - impact may extend to other components
• Confidentiality Impact: Low (C:L)
• Integrity Impact: Low (I:L)
• Availability Impact: Low (A:L)

The threat level is high due to the low complexity and no privileges required, though user interaction is needed.

Deep Dive & Mechanics

The vulnerability is due to improper neutralization of user input during web page generation. The plugin likely reflects user-supplied data (e.g., via GET parameters) without proper sanitization or encoding. An attacker can craft a URL containing malicious JavaScript, which when visited by an authenticated WordPress admin or user, executes in the context of the victim's session.

The vulnerable parameter is likely related to the pincode checking functionality, where input is echoed back to the page without escaping. For example, a URL like:

https://example.com/?pincode=<script>alert('XSS')</script>

would cause the script to execute.

Vulnerable vs. Patched Code

Since no patch is available, we can only describe the vulnerable code pattern. The vulnerable code likely looks like:

// Vulnerable code (check-pincode-for-woocommerce <= 1.1)
$pincode = $_GET['pincode'];
echo "You entered: " . $pincode;

A patched version would use proper escaping:

// Patched code (hypothetical)
$pincode = sanitize_text_field($_GET['pincode']);
echo "You entered: " . esc_html($pincode);

The esc_html() function in WordPress escapes HTML entities, preventing script injection.

Exploitation & Lab Setup

Red Team

1. Setup: Install WordPress with the vulnerable plugin (version 1.1) on a local server.
2. Craft Payload: Create a URL with a malicious script:

   http://localhost/wp-admin/admin-ajax.php?action=check_pincode&pincode=<script>alert(document.cookie)</script>
   

   (Note: The exact parameter may vary; use pincode or similar.)
3. Deliver: Send the crafted link to a victim via email or social engineering.
4. Execute: When the victim clicks the link, the script executes in their browser.

Blue Team

1. Detection: Monitor web server logs for requests containing <script> tags in query parameters.
2. Prevention: Implement a Web Application Firewall (WAF) rule to block reflected XSS patterns.
3. Response: If an attack is detected, block the attacker's IP and review logs for compromised sessions.

Indicators of Compromise (IOCs)

• Network: HTTP requests with query parameters containing <script>, onerror, onload, or similar XSS vectors.
• Host: Presence of the plugin check-pincode-for-woocommerce version 1.1 in the WordPress plugins directory.
• Logs: Apache/Nginx access logs showing requests to admin-ajax.php with suspicious pincode parameters.

Detection Engineering

YARA Rule

rule Detect_Reflected_XSS_WordPress_Plugin {
    meta:
        description = "Detects reflected XSS attempts targeting Check Pincode For Woocommerce plugin"
        author = "Valters IT"
        date = "2025-04-10"
        cve = "CVE-2024-54333"
    strings:
        $xss_pattern1 = /pincode=.*<script>/i
        $xss_pattern2 = /pincode=.*onerror=/i
        $xss_pattern3 = /pincode=.*alert\(/i
    condition:
        any of them
}

Sigma Rule

title: Reflected XSS Attempt Against Check Pincode For Woocommerce
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects reflected XSS attempts targeting the Check Pincode For Woocommerce plugin
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        c-uri|contains: 
            - "pincode=<script>"
            - "pincode=onerror="
            - "pincode=alert("
    condition: selection
falsepositives:
    - Legitimate use of similar strings in non-malicious contexts
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2024-54333 Reflected XSS Attempt"; flow:to_server; content:"pincode="; nocase; content:"<script>"; within:100; sid:1000001; rev:1;)

Remediation & Mitigation

• Immediate: Disable the plugin until a patch is available.
• Workaround: Implement a WAF rule to block requests containing <script> in the pincode parameter.
• Long-term: Monitor the plugin's page for updates. If no patch is released, consider replacing the plugin with an alternative.
• User Education: Train users not to click suspicious links and to report unusual behavior.

Valters IT
Securing Digital Frontiers