Stored XSS in BUKAZU Search Widget Allows Script Injection

Mitigation Strategies

Update the BUKAZU Search widget plugin for WordPress to a version later than 3.3.2 where the vulnerability is fixed. Additionally, restrict Contributor-level access and above to trusted users only to reduce the risk of exploitation.

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Detection Guidance

To detect this vulnerability, you can look for instances of the 'bukazu_search' shortcode in WordPress pages or posts, especially those that include the 'shortcode' parameter. Since the vulnerability involves Stored Cross-Site Scripting (XSS) via this parameter, you can search the WordPress database for posts containing the shortcode with suspicious script tags or encoded JavaScript. Additionally, monitoring HTTP requests and responses for injected scripts in pages that use the Bukazu Search widget can help detect exploitation attempts. Specific commands to search the WordPress database (assuming access to the database) include SQL queries like: SELECT ID, post_content FROM wp_posts WHERE post_content LIKE '%[bukazu_search%'; or searching for script tags within those shortcodes: SELECT ID, post_content FROM wp_posts WHERE post_content LIKE '%[bukazu_search%<script%'; For network detection, using web application firewall (WAF) logs or intrusion detection systems (IDS) to monitor for suspicious payloads in POST or GET parameters related to 'bukazu_search' shortcode usage can be helpful. However, no explicit detection commands are provided in the resources.

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Executive Summary

This vulnerability is a Stored Cross-Site Scripting (XSS) issue in the BUKAZU Search widget plugin for WordPress. It occurs via the 'shortcode' parameter of the 'bukazu_search' shortcode in versions up to 3.3.2. Due to insufficient input sanitization and output escaping on user-supplied attributes, authenticated attackers with Contributor-level access or higher can inject arbitrary web scripts into pages. These scripts execute whenever a user accesses the injected page.

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Impact Analysis

The vulnerability allows attackers with Contributor-level access or above to inject malicious scripts into WordPress pages. This can lead to unauthorized actions such as stealing user credentials, session hijacking, defacement, or spreading malware to users who visit the affected pages.

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