Detection Guidance

This vulnerability involves stored Cross-Site Scripting (XSS) in the GNTT Post Title Ticker WordPress plugin version 1.0, specifically via shortcode attributes that are not properly sanitized or escaped.

To detect this vulnerability on your system, you can inspect pages or posts that use the affected shortcodes: `title-ticker-slide`, `title-ticker-fade`, and `title-ticker-typing`. Look for suspicious or unexpected script tags or JavaScript code injected via the shortcode attributes such as `border`, `width`, `height`, `header_background`, `header_text_color`, and `id`.

Since this is a stored XSS vulnerability, detection involves reviewing the content stored in the WordPress database for malicious scripts in these shortcode attributes.

Suggested commands or steps include:

• Use WP-CLI to search posts for suspicious shortcode usage, e.g., `wp post list --post_type=post --format=ids | xargs -I % wp post get % --field=post_content | grep -iE '<script|onerror|onload|javascript:'`
• Manually or programmatically search the database for shortcode attributes containing script tags or suspicious JavaScript code.
• Monitor HTTP responses for injected scripts when accessing pages using the affected shortcodes.

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Executive Summary

The GNTT Post Title Ticker plugin for WordPress version 1.0 has a Stored Cross-Site Scripting (XSS) vulnerability. This occurs because certain shortcode attributes such as border, width, height, header_background, header_text_color, and id are not properly sanitized or escaped before being included in the HTML output. Specifically, the functions handling these shortcodes do not use escaping functions like esc_attr(), allowing authenticated users with contributor-level access or higher to inject malicious scripts. These scripts then execute whenever any user views the affected page.

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Impact Analysis

This vulnerability can allow attackers with contributor-level access to inject arbitrary malicious scripts into pages. When other users visit these pages, the injected scripts execute in their browsers, potentially leading to theft of sensitive information, session hijacking, defacement, or other malicious actions. Because the vulnerability requires only low-level authenticated access, it increases the risk of exploitation within a site.

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Mitigation Strategies

Immediate mitigation steps include:

• Restrict contributor-level and higher users from adding or editing content that uses the vulnerable shortcodes until a patch is applied.
• Remove or sanitize existing shortcode attributes in posts that may contain malicious scripts.
• Update the GNTT Post Title Ticker plugin to a version that properly sanitizes and escapes shortcode attributes once a patch is available.
• Implement Web Application Firewall (WAF) rules to block or sanitize suspicious script injections related to these shortcodes.
• Educate users with contributor-level access about the risks of injecting scripts via shortcode attributes.

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Compliance Impact

The vulnerability allows authenticated attackers with contributor-level access to inject arbitrary web scripts that execute when users access the affected pages. This stored cross-site scripting (XSS) flaw can lead to unauthorized access to user data or session hijacking.

Such security weaknesses can impact compliance with standards like GDPR and HIPAA, which require protection of personal data and secure handling of user information. Exploitation of this vulnerability could result in data breaches or unauthorized data exposure, thereby violating these regulations.

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