Zion Builder SVG File Stored XSS Vulnerability

Executive Summary

This vulnerability is a stored cross-site scripting (XSS) flaw in the Zion Builder WordPress plugin versions up to 3.6.17. Authenticated users with Author role or higher can upload malicious SVG files containing JavaScript. The plugin fails to sanitize or validate these files, storing them in a publicly accessible location. When accessed, the embedded JavaScript executes in the victim's browser.

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Detection Guidance

Check for unauthorized SVG files in the Zion Builder uploads directory. Look for files with suspicious JavaScript content in their metadata or structure. Use commands like 'find /path/to/uploads -name "*.svg" -exec grep -l "<script>" {} \;' to scan for embedded scripts.

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Impact Analysis

This vulnerability allows attackers to execute arbitrary JavaScript in the browsers of anyone who views the malicious SVG file. This could lead to unauthorized actions on the website, theft of sensitive data like cookies or session tokens, or defacement of the site. Users with Author role or above can exploit this to compromise the site.

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Compliance Impact

This vulnerability could lead to data breaches by allowing attackers to steal sensitive user data, which may violate GDPR or HIPAA requirements for data protection. Organizations could face compliance penalties if user data is compromised through this exploit.

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Mitigation Strategies

Disable SVG uploads in Zion Builder if possible. Restrict file uploads to trusted users only. Monitor uploaded SVG files for unexpected JavaScript or executable code. Consider temporarily removing the plugin until an official patch is released.

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